File: _basic.py

package info (click to toggle)
wxpython3.0 3.0.1.1+dfsg-2
  • links: PTS, VCS
  • area: main
  • in suites: jessie, jessie-kfreebsd
  • size: 481,208 kB
  • ctags: 520,541
  • sloc: cpp: 2,126,470; python: 293,214; makefile: 51,927; ansic: 19,032; sh: 3,011; xml: 1,629; perl: 17
file content (3179 lines) | stat: -rw-r--r-- 110,917 bytes parent folder | download | duplicates (3)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204
1205
1206
1207
1208
1209
1210
1211
1212
1213
1214
1215
1216
1217
1218
1219
1220
1221
1222
1223
1224
1225
1226
1227
1228
1229
1230
1231
1232
1233
1234
1235
1236
1237
1238
1239
1240
1241
1242
1243
1244
1245
1246
1247
1248
1249
1250
1251
1252
1253
1254
1255
1256
1257
1258
1259
1260
1261
1262
1263
1264
1265
1266
1267
1268
1269
1270
1271
1272
1273
1274
1275
1276
1277
1278
1279
1280
1281
1282
1283
1284
1285
1286
1287
1288
1289
1290
1291
1292
1293
1294
1295
1296
1297
1298
1299
1300
1301
1302
1303
1304
1305
1306
1307
1308
1309
1310
1311
1312
1313
1314
1315
1316
1317
1318
1319
1320
1321
1322
1323
1324
1325
1326
1327
1328
1329
1330
1331
1332
1333
1334
1335
1336
1337
1338
1339
1340
1341
1342
1343
1344
1345
1346
1347
1348
1349
1350
1351
1352
1353
1354
1355
1356
1357
1358
1359
1360
1361
1362
1363
1364
1365
1366
1367
1368
1369
1370
1371
1372
1373
1374
1375
1376
1377
1378
1379
1380
1381
1382
1383
1384
1385
1386
1387
1388
1389
1390
1391
1392
1393
1394
1395
1396
1397
1398
1399
1400
1401
1402
1403
1404
1405
1406
1407
1408
1409
1410
1411
1412
1413
1414
1415
1416
1417
1418
1419
1420
1421
1422
1423
1424
1425
1426
1427
1428
1429
1430
1431
1432
1433
1434
1435
1436
1437
1438
1439
1440
1441
1442
1443
1444
1445
1446
1447
1448
1449
1450
1451
1452
1453
1454
1455
1456
1457
1458
1459
1460
1461
1462
1463
1464
1465
1466
1467
1468
1469
1470
1471
1472
1473
1474
1475
1476
1477
1478
1479
1480
1481
1482
1483
1484
1485
1486
1487
1488
1489
1490
1491
1492
1493
1494
1495
1496
1497
1498
1499
1500
1501
1502
1503
1504
1505
1506
1507
1508
1509
1510
1511
1512
1513
1514
1515
1516
1517
1518
1519
1520
1521
1522
1523
1524
1525
1526
1527
1528
1529
1530
1531
1532
1533
1534
1535
1536
1537
1538
1539
1540
1541
1542
1543
1544
1545
1546
1547
1548
1549
1550
1551
1552
1553
1554
1555
1556
1557
1558
1559
1560
1561
1562
1563
1564
1565
1566
1567
1568
1569
1570
1571
1572
1573
1574
1575
1576
1577
1578
1579
1580
1581
1582
1583
1584
1585
1586
1587
1588
1589
1590
1591
1592
1593
1594
1595
1596
1597
1598
1599
1600
1601
1602
1603
1604
1605
1606
1607
1608
1609
1610
1611
1612
1613
1614
1615
1616
1617
1618
1619
1620
1621
1622
1623
1624
1625
1626
1627
1628
1629
1630
1631
1632
1633
1634
1635
1636
1637
1638
1639
1640
1641
1642
1643
1644
1645
1646
1647
1648
1649
1650
1651
1652
1653
1654
1655
1656
1657
1658
1659
1660
1661
1662
1663
1664
1665
1666
1667
1668
1669
1670
1671
1672
1673
1674
1675
1676
1677
1678
1679
1680
1681
1682
1683
1684
1685
1686
1687
1688
1689
1690
1691
1692
1693
1694
1695
1696
1697
1698
1699
1700
1701
1702
1703
1704
1705
1706
1707
1708
1709
1710
1711
1712
1713
1714
1715
1716
1717
1718
1719
1720
1721
1722
1723
1724
1725
1726
1727
1728
1729
1730
1731
1732
1733
1734
1735
1736
1737
1738
1739
1740
1741
1742
1743
1744
1745
1746
1747
1748
1749
1750
1751
1752
1753
1754
1755
1756
1757
1758
1759
1760
1761
1762
1763
1764
1765
1766
1767
1768
1769
1770
1771
1772
1773
1774
1775
1776
1777
1778
1779
1780
1781
1782
1783
1784
1785
1786
1787
1788
1789
1790
1791
1792
1793
1794
1795
1796
1797
1798
1799
1800
1801
1802
1803
1804
1805
1806
1807
1808
1809
1810
1811
1812
1813
1814
1815
1816
1817
1818
1819
1820
1821
1822
1823
1824
1825
1826
1827
1828
1829
1830
1831
1832
1833
1834
1835
1836
1837
1838
1839
1840
1841
1842
1843
1844
1845
1846
1847
1848
1849
1850
1851
1852
1853
1854
1855
1856
1857
1858
1859
1860
1861
1862
1863
1864
1865
1866
1867
1868
1869
1870
1871
1872
1873
1874
1875
1876
1877
1878
1879
1880
1881
1882
1883
1884
1885
1886
1887
1888
1889
1890
1891
1892
1893
1894
1895
1896
1897
1898
1899
1900
1901
1902
1903
1904
1905
1906
1907
1908
1909
1910
1911
1912
1913
1914
1915
1916
1917
1918
1919
1920
1921
1922
1923
1924
1925
1926
1927
1928
1929
1930
1931
1932
1933
1934
1935
1936
1937
1938
1939
1940
1941
1942
1943
1944
1945
1946
1947
1948
1949
1950
1951
1952
1953
1954
1955
1956
1957
1958
1959
1960
1961
1962
1963
1964
1965
1966
1967
1968
1969
1970
1971
1972
1973
1974
1975
1976
1977
1978
1979
1980
1981
1982
1983
1984
1985
1986
1987
1988
1989
1990
1991
1992
1993
1994
1995
1996
1997
1998
1999
2000
2001
2002
2003
2004
2005
2006
2007
2008
2009
2010
2011
2012
2013
2014
2015
2016
2017
2018
2019
2020
2021
2022
2023
2024
2025
2026
2027
2028
2029
2030
2031
2032
2033
2034
2035
2036
2037
2038
2039
2040
2041
2042
2043
2044
2045
2046
2047
2048
2049
2050
2051
2052
2053
2054
2055
2056
2057
2058
2059
2060
2061
2062
2063
2064
2065
2066
2067
2068
2069
2070
2071
2072
2073
2074
2075
2076
2077
2078
2079
2080
2081
2082
2083
2084
2085
2086
2087
2088
2089
2090
2091
2092
2093
2094
2095
2096
2097
2098
2099
2100
2101
2102
2103
2104
2105
2106
2107
2108
2109
2110
2111
2112
2113
2114
2115
2116
2117
2118
2119
2120
2121
2122
2123
2124
2125
2126
2127
2128
2129
2130
2131
2132
2133
2134
2135
2136
2137
2138
2139
2140
2141
2142
2143
2144
2145
2146
2147
2148
2149
2150
2151
2152
2153
2154
2155
2156
2157
2158
2159
2160
2161
2162
2163
2164
2165
2166
2167
2168
2169
2170
2171
2172
2173
2174
2175
2176
2177
2178
2179
2180
2181
2182
2183
2184
2185
2186
2187
2188
2189
2190
2191
2192
2193
2194
2195
2196
2197
2198
2199
2200
2201
2202
2203
2204
2205
2206
2207
2208
2209
2210
2211
2212
2213
2214
2215
2216
2217
2218
2219
2220
2221
2222
2223
2224
2225
2226
2227
2228
2229
2230
2231
2232
2233
2234
2235
2236
2237
2238
2239
2240
2241
2242
2243
2244
2245
2246
2247
2248
2249
2250
2251
2252
2253
2254
2255
2256
2257
2258
2259
2260
2261
2262
2263
2264
2265
2266
2267
2268
2269
2270
2271
2272
2273
2274
2275
2276
2277
2278
2279
2280
2281
2282
2283
2284
2285
2286
2287
2288
2289
2290
2291
2292
2293
2294
2295
2296
2297
2298
2299
2300
2301
2302
2303
2304
2305
2306
2307
2308
2309
2310
2311
2312
2313
2314
2315
2316
2317
2318
2319
2320
2321
2322
2323
2324
2325
2326
2327
2328
2329
2330
2331
2332
2333
2334
2335
2336
2337
2338
2339
2340
2341
2342
2343
2344
2345
2346
2347
2348
2349
2350
2351
2352
2353
2354
2355
2356
2357
2358
2359
2360
2361
2362
2363
2364
2365
2366
2367
2368
2369
2370
2371
2372
2373
2374
2375
2376
2377
2378
2379
2380
2381
2382
2383
2384
2385
2386
2387
2388
2389
2390
2391
2392
2393
2394
2395
2396
2397
2398
2399
2400
2401
2402
2403
2404
2405
2406
2407
2408
2409
2410
2411
2412
2413
2414
2415
2416
2417
2418
2419
2420
2421
2422
2423
2424
2425
2426
2427
2428
2429
2430
2431
2432
2433
2434
2435
2436
2437
2438
2439
2440
2441
2442
2443
2444
2445
2446
2447
2448
2449
2450
2451
2452
2453
2454
2455
2456
2457
2458
2459
2460
2461
2462
2463
2464
2465
2466
2467
2468
2469
2470
2471
2472
2473
2474
2475
2476
2477
2478
2479
2480
2481
2482
2483
2484
2485
2486
2487
2488
2489
2490
2491
2492
2493
2494
2495
2496
2497
2498
2499
2500
2501
2502
2503
2504
2505
2506
2507
2508
2509
2510
2511
2512
2513
2514
2515
2516
2517
2518
2519
2520
2521
2522
2523
2524
2525
2526
2527
2528
2529
2530
2531
2532
2533
2534
2535
2536
2537
2538
2539
2540
2541
2542
2543
2544
2545
2546
2547
2548
2549
2550
2551
2552
2553
2554
2555
2556
2557
2558
2559
2560
2561
2562
2563
2564
2565
2566
2567
2568
2569
2570
2571
2572
2573
2574
2575
2576
2577
2578
2579
2580
2581
2582
2583
2584
2585
2586
2587
2588
2589
2590
2591
2592
2593
2594
2595
2596
2597
2598
2599
2600
2601
2602
2603
2604
2605
2606
2607
2608
2609
2610
2611
2612
2613
2614
2615
2616
2617
2618
2619
2620
2621
2622
2623
2624
2625
2626
2627
2628
2629
2630
2631
2632
2633
2634
2635
2636
2637
2638
2639
2640
2641
2642
2643
2644
2645
2646
2647
2648
2649
2650
2651
2652
2653
2654
2655
2656
2657
2658
2659
2660
2661
2662
2663
2664
2665
2666
2667
2668
2669
2670
2671
2672
2673
2674
2675
2676
2677
2678
2679
2680
2681
2682
2683
2684
2685
2686
2687
2688
2689
2690
2691
2692
2693
2694
2695
2696
2697
2698
2699
2700
2701
2702
2703
2704
2705
2706
2707
2708
2709
2710
2711
2712
2713
2714
2715
2716
2717
2718
2719
2720
2721
2722
2723
2724
2725
2726
2727
2728
2729
2730
2731
2732
2733
2734
2735
2736
2737
2738
2739
2740
2741
2742
2743
2744
2745
2746
2747
2748
2749
2750
2751
2752
2753
2754
2755
2756
2757
2758
2759
2760
2761
2762
2763
2764
2765
2766
2767
2768
2769
2770
2771
2772
2773
2774
2775
2776
2777
2778
2779
2780
2781
2782
2783
2784
2785
2786
2787
2788
2789
2790
2791
2792
2793
2794
2795
2796
2797
2798
2799
2800
2801
2802
2803
2804
2805
2806
2807
2808
2809
2810
2811
2812
2813
2814
2815
2816
2817
2818
2819
2820
2821
2822
2823
2824
2825
2826
2827
2828
2829
2830
2831
2832
2833
2834
2835
2836
2837
2838
2839
2840
2841
2842
2843
2844
2845
2846
2847
2848
2849
2850
2851
2852
2853
2854
2855
2856
2857
2858
2859
2860
2861
2862
2863
2864
2865
2866
2867
2868
2869
2870
2871
2872
2873
2874
2875
2876
2877
2878
2879
2880
2881
2882
2883
2884
2885
2886
2887
2888
2889
2890
2891
2892
2893
2894
2895
2896
2897
2898
2899
2900
2901
2902
2903
2904
2905
2906
2907
2908
2909
2910
2911
2912
2913
2914
2915
2916
2917
2918
2919
2920
2921
2922
2923
2924
2925
2926
2927
2928
2929
2930
2931
2932
2933
2934
2935
2936
2937
2938
2939
2940
2941
2942
2943
2944
2945
2946
2947
2948
2949
2950
2951
2952
2953
2954
2955
2956
2957
2958
2959
2960
2961
2962
2963
2964
2965
2966
2967
2968
2969
2970
2971
2972
2973
2974
2975
2976
2977
2978
2979
2980
2981
2982
2983
2984
2985
2986
2987
2988
2989
2990
2991
2992
2993
2994
2995
2996
2997
2998
2999
3000
3001
3002
3003
3004
3005
3006
3007
3008
3009
3010
3011
3012
3013
3014
3015
3016
3017
3018
3019
3020
3021
3022
3023
3024
3025
3026
3027
3028
3029
3030
3031
3032
3033
3034
3035
3036
3037
3038
3039
3040
3041
3042
3043
3044
3045
3046
3047
3048
3049
3050
3051
3052
3053
3054
3055
3056
3057
3058
3059
3060
3061
3062
3063
3064
3065
3066
3067
3068
3069
3070
3071
3072
3073
3074
3075
3076
3077
3078
3079
3080
3081
3082
3083
3084
3085
3086
3087
3088
3089
3090
3091
3092
3093
3094
3095
3096
3097
3098
3099
3100
3101
3102
3103
3104
3105
3106
3107
3108
3109
3110
3111
3112
3113
3114
3115
3116
3117
3118
3119
3120
3121
3122
3123
3124
3125
3126
3127
3128
3129
3130
3131
3132
3133
3134
3135
3136
3137
3138
3139
3140
3141
3142
3143
3144
3145
3146
3147
3148
3149
3150
3151
3152
3153
3154
3155
3156
3157
3158
3159
3160
3161
3162
3163
3164
3165
3166
3167
3168
3169
3170
3171
3172
3173
3174
3175
3176
3177
3178
3179
# -*- coding: utf-8 -*-
#----------------------------------------------------------------------------
# Name:         basic.py
# Purpose:      The basic OGL shapes
#
# Author:       Pierre Hjälm (from C++ original by Julian Smart)
#
# Created:      2004-05-08
# RCS-ID:       $Id$
# Copyright:    (c) 2004 Pierre Hjälm - 1998 Julian Smart
# Licence:      wxWindows license
#----------------------------------------------------------------------------

import wx
import math

from _oglmisc import *

DragOffsetX = 0.0
DragOffsetY = 0.0

def OGLInitialize():
    global WhiteBackgroundPen, WhiteBackgroundBrush, TransparentPen
    global BlackForegroundPen, NormalFont
    
    WhiteBackgroundPen = wx.Pen(wx.WHITE, 1, wx.SOLID)
    WhiteBackgroundBrush = wx.Brush(wx.WHITE, wx.SOLID)

    TransparentPen = wx.Pen(wx.WHITE, 1, wx.TRANSPARENT)
    BlackForegroundPen = wx.Pen(wx.BLACK, 1, wx.SOLID)

    NormalFont = wx.Font(10, wx.SWISS, wx.NORMAL, wx.NORMAL)


def OGLCleanUp():
    pass


class ShapeTextLine(object):
    def __init__(self, the_x, the_y, the_line):
        self._x = the_x
        self._y = the_y
        self._line = the_line

    def GetX(self):
        return self._x

    def GetY(self):
        return self._y

    def SetX(self, x):
        self._x = x

    def SetY(self, y):
        self._y = y

    def SetText(self, text):
        self._line = text

    def GetText(self):
        return self._line


    
class ShapeEvtHandler(object):
    def __init__(self, prev = None, shape = None):
        self._previousHandler = prev
        self._handlerShape = shape

    def SetShape(self, sh):
        self._handlerShape = sh

    def GetShape(self):
        return self._handlerShape

    def SetPreviousHandler(self, handler):
        self._previousHandler = handler

    def GetPreviousHandler(self):
        return self._previousHandler

    def OnDelete(self):
        if self!=self.GetShape():
            del self
            
    def OnDraw(self, dc):
        if self._previousHandler:
            self._previousHandler.OnDraw(dc)

    def OnMoveLinks(self, dc):
        if self._previousHandler:
            self._previousHandler.OnMoveLinks(dc)
            
    def OnMoveLink(self, dc, moveControlPoints = True):
        if self._previousHandler:
            self._previousHandler.OnMoveLink(dc, moveControlPoints)
            
    def OnDrawContents(self, dc):
        if self._previousHandler:
            self._previousHandler.OnDrawContents(dc)
            
    def OnDrawBranches(self, dc, erase = False):
        if self._previousHandler:
            self._previousHandler.OnDrawBranches(dc, erase = erase)

    def OnSize(self, x, y):
        if self._previousHandler:
            self._previousHandler.OnSize(x, y)
            
    def OnMovePre(self, dc, x, y, old_x, old_y, display = True):
        if self._previousHandler:
            return self._previousHandler.OnMovePre(dc, x, y, old_x, old_y, display)
        else:
            return True

    def OnMovePost(self, dc, x, y, old_x, old_y, display = True):
        if self._previousHandler:
            return self._previousHandler.OnMovePost(dc, x, y, old_x, old_y, display)
        else:
            return True

    def OnErase(self, dc):
        if self._previousHandler:
            self._previousHandler.OnErase(dc)

    def OnEraseContents(self, dc):
        if self._previousHandler:
            self._previousHandler.OnEraseContents(dc)

    def OnHighlight(self, dc):
        if self._previousHandler:
            self._previousHandler.OnHighlight(dc)

    def OnLeftClick(self, x, y, keys, attachment):
        if self._previousHandler:
            self._previousHandler.OnLeftClick(x, y, keys, attachment)
            
    def OnLeftDoubleClick(self, x, y, keys = 0, attachment = 0):
        if self._previousHandler:
            self._previousHandler.OnLeftDoubleClick(x, y, keys, attachment)

    def OnRightClick(self, x, y, keys = 0, attachment = 0):
        if self._previousHandler:
            self._previousHandler.OnRightClick(x, y, keys, attachment)

    def OnDragLeft(self, draw, x, y, keys = 0, attachment = 0):
        if self._previousHandler:
            self._previousHandler.OnDragLeft(draw, x, y, keys, attachment)

    def OnBeginDragLeft(self, x, y, keys = 0, attachment = 0):
        if self._previousHandler:
            self._previousHandler.OnBeginDragLeft(x, y, keys, attachment)

    def OnEndDragLeft(self, x, y, keys = 0, attachment = 0):
        if self._previousHandler:
            self._previousHandler.OnEndDragLeft(x, y, keys, attachment)
        
    def OnDragRight(self, draw, x, y, keys = 0, attachment = 0):
        if self._previousHandler:
            self._previousHandler.OnDragRight(draw, x, y, keys, attachment)

    def OnBeginDragRight(self, x, y, keys = 0, attachment = 0):
        if self._previousHandler:
            self._previousHandler.OnBeginDragRight(x, y, keys, attachment)

    def OnEndDragRight(self, x, y, keys = 0, attachment = 0):
        if self._previousHandler:
            self._previousHandler.OnEndDragRight(x, y, keys, attachment)

    # Control points ('handles') redirect control to the actual shape,
    # to make it easier to override sizing behaviour.
    def OnSizingDragLeft(self, pt, draw, x, y, keys = 0, attachment = 0):
        if self._previousHandler:
            self._previousHandler.OnSizingDragLeft(pt, draw, x, y, keys, attachment)

    def OnSizingBeginDragLeft(self, pt, x, y, keys = 0, attachment = 0):
        if self._previousHandler:
            self._previousHandler.OnSizingBeginDragLeft(pt, x, y, keys, attachment)
            
    def OnSizingEndDragLeft(self, pt, x, y, keys = 0, attachment = 0):
        if self._previousHandler:
            self._previousHandler.OnSizingEndDragLeft(pt, x, y, keys, attachment)

    def OnBeginSize(self, w, h):
        pass
    
    def OnEndSize(self, w, h):
        pass
    
    def OnDrawOutline(self, dc, x, y, w, h):
        if self._previousHandler:
            self._previousHandler.OnDrawOutline(dc, x, y, w, h)

    def OnDrawControlPoints(self, dc):
        if self._previousHandler:
            self._previousHandler.OnDrawControlPoints(dc)

    def OnEraseControlPoints(self, dc):
        if self._previousHandler:
            self._previousHandler.OnEraseControlPoints(dc)

    # Can override this to prevent or intercept line reordering.
    def OnChangeAttachment(self, attachment, line, ordering):
        if self._previousHandler:
            self._previousHandler.OnChangeAttachment(attachment, line, ordering)


            
class Shape(ShapeEvtHandler):
    """OGL base class

    Shape(canvas = None)
    
    The wxShape is the top-level, abstract object that all other objects
    are derived from. All common functionality is represented by wxShape's
    members, and overriden members that appear in derived classes and have
    behaviour as documented for wxShape, are not documented separately.
    """
    
    GraphicsInSizeToContents = False
    
    def __init__(self, canvas = None):
        ShapeEvtHandler.__init__(self)
        
        self._eventHandler = self
        self.SetShape(self)
        self._id = 0
        self._formatted = False
        self._canvas = canvas
        self._xpos = 0.0
        self._ypos = 0.0
        self._pen = BlackForegroundPen
        self._brush = wx.WHITE_BRUSH
        self._font = NormalFont
        self._textColour = wx.BLACK
        self._textColourName = wx.BLACK
        self._visible = False
        self._selected = False
        self._attachmentMode = ATTACHMENT_MODE_NONE
        self._spaceAttachments = True
        self._disableLabel = False
        self._fixedWidth = False
        self._fixedHeight = False
        self._drawHandles = True
        self._sensitivity = OP_ALL
        self._draggable = True
        self._parent = None
        self._formatMode = FORMAT_CENTRE_HORIZ | FORMAT_CENTRE_VERT
        self._shadowMode = SHADOW_NONE
        self._shadowOffsetX = 6
        self._shadowOffsetY = 6
        self._shadowBrush = wx.BLACK_BRUSH
        self._textMarginX = 5
        self._textMarginY = 5
        self._regionName = "0"
        self._centreResize = True
        self._maintainAspectRatio = False
        self._highlighted = False
        self._rotation = 0.0
        self._branchNeckLength = 10
        self._branchStemLength = 10
        self._branchSpacing = 10
        self._branchStyle = BRANCHING_ATTACHMENT_NORMAL
        
        self._regions = []
        self._lines = []
        self._controlPoints = []
        self._attachmentPoints = []
        self._text = []
        self._children = []
        
        # Set up a default region. Much of the above will be put into
        # the region eventually (the duplication is for compatibility)
        region = ShapeRegion()
        region.SetName("0")
        region.SetFont(NormalFont)
        region.SetFormatMode(FORMAT_CENTRE_HORIZ | FORMAT_CENTRE_VERT)
        region.SetColour("BLACK")
        self._regions.append(region)

    def __str__(self):
        return "<%s.%s>" % (self.__class__.__module__, self.__class__.__name__)

    def GetClassName(self):
        return str(self.__class__).split(".")[-1][:-2]

    def Delete(self):
        """
        Fully disconnect this shape from parents, children, the
        canvas, etc.
        """
        if self._parent:
            self._parent.GetChildren().remove(self)

        for child in self.GetChildren():
            child.Delete()

        self.ClearText()
        self.ClearRegions()
        self.ClearAttachments()

        self._handlerShape = None
        
        if self._canvas:
            self.RemoveFromCanvas(self._canvas)

        if self.GetEventHandler():
            self.GetEventHandler().OnDelete()
        self._eventHandler = None
        
    def Draggable(self):
        """TRUE if the shape may be dragged by the user."""
        return True
    
    def SetShape(self, sh):
        self._handlerShape = sh

    def GetCanvas(self):
        """Get the internal canvas."""
        return self._canvas

    def GetBranchStyle(self):
        return self._branchStyle

    def GetRotation(self):
        """Return the angle of rotation in radians."""
        return self._rotation

    def SetRotation(self, rotation):
        self._rotation = rotation
        
    def SetHighlight(self, hi, recurse = False):
        """Set the highlight for a shape. Shape highlighting is unimplemented."""
        self._highlighted = hi
        if recurse:
            for shape in self._children:
                shape.SetHighlight(hi, recurse)

    def SetSensitivityFilter(self, sens = OP_ALL, recursive = False):
        """Set the shape to be sensitive or insensitive to specific mouse
        operations.

        sens is a bitlist of the following:

        * OP_CLICK_LEFT
        * OP_CLICK_RIGHT
        * OP_DRAG_LEFT
        * OP_DRAG_RIGHT
        * OP_ALL (equivalent to a combination of all the above).
        """
        self._draggable = sens & OP_DRAG_LEFT

        self._sensitivity = sens
        if recursive:
            for shape in self._children:
                shape.SetSensitivityFilter(sens, True)

    def SetDraggable(self, drag, recursive = False):
        """Set the shape to be draggable or not draggable."""
        self._draggable = drag
        if drag:
            self._sensitivity |= OP_DRAG_LEFT
        elif self._sensitivity & OP_DRAG_LEFT:
            self._sensitivity -= OP_DRAG_LEFT

        if recursive:
            for shape in self._children:
                shape.SetDraggable(drag, True)

    def SetDrawHandles(self, drawH):
        """Set the drawHandles flag for this shape and all descendants.
        If drawH is TRUE (the default), any handles (control points) will
        be drawn. Otherwise, the handles will not be drawn.
        """
        self._drawHandles = drawH
        for shape in self._children:
            shape.SetDrawHandles(drawH)

    def SetShadowMode(self, mode, redraw = False):
        """Set the shadow mode (whether a shadow is drawn or not).
        mode can be one of the following:

        SHADOW_NONE
          No shadow (the default). 
        SHADOW_LEFT
          Shadow on the left side. 
        SHADOW_RIGHT
          Shadow on the right side.
        """
        if redraw and self.GetCanvas():
            dc = wx.ClientDC(self.GetCanvas())
            self.GetCanvas().PrepareDC(dc)
            self.Erase(dc)
            self._shadowMode = mode
            self.Draw(dc)
        else:
            self._shadowMode = mode

    def GetShadowMode(self):
        """Return the current shadow mode setting"""
        return self._shadowMode

    def SetCanvas(self, theCanvas):
        """Identical to Shape.Attach."""
        self._canvas = theCanvas
        for shape in self._children:
            shape.SetCanvas(theCanvas)

    def AddToCanvas(self, theCanvas, addAfter = None):
        """Add the shape to the canvas's shape list.
        If addAfter is non-NULL, will add the shape after this one.
        """
        theCanvas.AddShape(self, addAfter)

        lastImage = self
        for object in self._children:
            object.AddToCanvas(theCanvas, lastImage)
            lastImage = object

    def InsertInCanvas(self, theCanvas):
        """Insert the shape at the front of the shape list of canvas."""
        theCanvas.InsertShape(self)

        lastImage = self
        for object in self._children:
            object.AddToCanvas(theCanvas, lastImage)
            lastImage = object

    def RemoveFromCanvas(self, theCanvas):
        """Remove the shape from the canvas."""
        if self.Selected():
            self.Select(False)
        
        self._canvas = None
        theCanvas.RemoveShape(self)
        for object in self._children:
            object.RemoveFromCanvas(theCanvas)

    def ClearAttachments(self):
        """Clear internal custom attachment point shapes (of class
        wxAttachmentPoint).
        """
        self._attachmentPoints = []

    def ClearText(self, regionId = 0):
        """Clear the text from the specified text region."""
        if regionId == 0:
            self._text = ""
        if regionId < len(self._regions):
            self._regions[regionId].ClearText()
            
    def ClearRegions(self):
        """Clear the ShapeRegions from the shape."""
        self._regions = []
            
    def AddRegion(self, region):
        """Add a region to the shape."""
        self._regions.append(region)

    def SetDefaultRegionSize(self):
        """Set the default region to be consistent with the shape size."""
        if not self._regions:
            return
        w, h = self.GetBoundingBoxMax()
        self._regions[0].SetSize(w, h)

    def HitTest(self, x, y):
        """Given a point on a canvas, returns TRUE if the point was on the
        shape, and returns the nearest attachment point and distance from
        the given point and target.
        """
        width, height = self.GetBoundingBoxMax()
        if abs(width) < 4:
            width = 4.0
        if abs(height) < 4:
            height = 4.0

        width += 4 # Allowance for inaccurate mousing
        height += 4
        
        left = self._xpos - width / 2.0
        top = self._ypos - height / 2.0
        right = self._xpos + width / 2.0
        bottom = self._ypos + height / 2.0

        nearest_attachment = 0

        # If within the bounding box, check the attachment points
        # within the object.
        if x >= left and x <= right and y >= top and y <= bottom:
            n = self.GetNumberOfAttachments()
            nearest = 999999

            # GetAttachmentPosition[Edge] takes a logical attachment position,
            # i.e. if it's rotated through 90%, position 0 is East-facing.

            for i in range(n):
                e = self.GetAttachmentPositionEdge(i)
                if e:
                    xp, yp = e
                    l = math.sqrt(((xp - x) * (xp - x)) + (yp - y) * (yp - y))
                    if l < nearest:
                        nearest = l
                        nearest_attachment = i

            return nearest_attachment, nearest
        return False
    
    # Format a text string according to the region size, adding
    # strings with positions to region text list
    
    def FormatText(self, dc, s, i = 0):
        """Reformat the given text region; defaults to formatting the
        default region.
        """
        self.ClearText(i)

        if not self._regions:
            return

        if i >= len(self._regions):
            return

        region = self._regions[i]
        region._regionText = s
        dc.SetFont(region.GetFont())

        w, h = region.GetSize()

        stringList = FormatText(dc, s, (w - 2 * self._textMarginX), (h - 2 * self._textMarginY), region.GetFormatMode())
        for s in stringList:
            line = ShapeTextLine(0.0, 0.0, s)
            region.GetFormattedText().append(line)

        actualW = w
        actualH = h
        # Don't try to resize an object with more than one image (this
        # case should be dealt with by overriden handlers)
        if (region.GetFormatMode() & FORMAT_SIZE_TO_CONTENTS) and \
           len(region.GetFormattedText()) and \
           len(self._regions) == 1 and \
           not Shape.GraphicsInSizeToContents:

            actualW, actualH = GetCentredTextExtent(dc, region.GetFormattedText())
            if actualW + 2 * self._textMarginX != w or actualH + 2 * self._textMarginY != h:
                # If we are a descendant of a composite, must make sure
                # the composite gets resized properly

                topAncestor = self.GetTopAncestor()
                if topAncestor != self:
                    Shape.GraphicsInSizeToContents = True

                    composite = topAncestor
                    composite.Erase(dc)
                    self.SetSize(actualW + 2 * self._textMarginX, actualH + 2 * self._textMarginY)
                    self.Move(dc, self._xpos, self._ypos)
                    composite.CalculateSize()
                    if composite.Selected():
                        composite.DeleteControlPoints(dc)
                        composite.MakeControlPoints()
                        composite.MakeMandatoryControlPoints()
                    # Where infinite recursion might happen if we didn't stop it
                    composite.Draw(dc)
                    Shape.GraphicsInSizeToContents = False
                else:
                    self.Erase(dc)
                    
                self.SetSize(actualW + 2 * self._textMarginX, actualH + 2 * self._textMarginY)
                self.Move(dc, self._xpos, self._ypos)
                self.EraseContents(dc)
        CentreText(dc, region.GetFormattedText(), self._xpos, self._ypos, actualW - 2 * self._textMarginX, actualH - 2 * self._textMarginY, region.GetFormatMode())
        self._formatted = True

    def Recentre(self, dc):
        """Do recentring (or other formatting) for all the text regions
        for this shape.
        """
        w, h = self.GetBoundingBoxMin()
        for region in self._regions:
            CentreText(dc, region.GetFormattedText(), self._xpos, self._ypos, w - 2 * self._textMarginX, h - 2 * self._textMarginY, region.GetFormatMode())

    def GetPerimeterPoint(self, x1, y1, x2, y2):
        """Get the point at which the line from (x1, y1) to (x2, y2) hits
        the shape. Returns False if the line doesn't hit the perimeter.
        """
        return False

    def SetPen(self, the_pen):
        """Set the pen for drawing the shape's outline."""
        self._pen = the_pen

    def SetBrush(self, the_brush):
        """Set the brush for filling the shape's shape."""
        self._brush = the_brush

    # Get the top - most (non-division) ancestor, or self
    def GetTopAncestor(self):
        """Return the top-most ancestor of this shape (the root of
        the composite).
        """
        if not self.GetParent():
            return self

        if isinstance(self.GetParent(), DivisionShape):
            return self
        return self.GetParent().GetTopAncestor()

    # Region functions
    def SetFont(self, the_font, regionId = 0):
        """Set the font for the specified text region."""
        self._font = the_font
        if regionId < len(self._regions):
            self._regions[regionId].SetFont(the_font)

    def GetFont(self, regionId = 0):
        """Get the font for the specified text region."""
        if regionId >= len(self._regions):
            return None
        return self._regions[regionId].GetFont()

    def SetFormatMode(self, mode, regionId = 0):
        """Set the format mode of the default text region. The argument
        can be a bit list of the following:

        FORMAT_NONE
          No formatting. 
        FORMAT_CENTRE_HORIZ
          Horizontal centring. 
        FORMAT_CENTRE_VERT
          Vertical centring.
        """
        if regionId < len(self._regions):
            self._regions[regionId].SetFormatMode(mode)

    def GetFormatMode(self, regionId = 0):
        if regionId >= len(self._regions):
            return 0
        return self._regions[regionId].GetFormatMode()

    def SetTextColour(self, the_colour, regionId = 0):
        """Set the colour for the specified text region."""
        self._textColour = wx.TheColourDatabase.Find(the_colour)
        self._textColourName = the_colour

        if regionId < len(self._regions):
            self._regions[regionId].SetColour(the_colour)
            
    def GetTextColour(self, regionId = 0):
        """Get the colour for the specified text region."""
        if regionId >= len(self._regions):
            return ""
        return self._regions[regionId].GetColour()

    def SetRegionName(self, name, regionId = 0):
        """Set the name for this region.
        The name for a region is unique within the scope of the whole
        composite, whereas a region id is unique only for a single image.
        """
        if regionId < len(self._regions):
            self._regions[regionId].SetName(name)

    def GetRegionName(self, regionId = 0):
        """Get the region's name.
        A region's name can be used to uniquely determine a region within
        an entire composite image hierarchy. See also Shape.SetRegionName.
        """
        if regionId >= len(self._regions):
            return ""
        return self._regions[regionId].GetName()

    def GetRegionId(self, name):
        """Get the region's identifier by name.
        This is not unique for within an entire composite, but is unique
        for the image.
        """
        for i, r in enumerate(self._regions):
            if r.GetName() == name:
                return i
        return -1

    # Name all _regions in all subimages recursively
    def NameRegions(self, parentName=""):
        """Make unique names for all the regions in a shape or composite shape."""
        n = self.GetNumberOfTextRegions()
        for i in range(n):
            if parentName:
                buff = parentName+"."+str(i)
            else:
                buff = str(i)
            self.SetRegionName(buff, i)

        for j, child in enumerate(self._children):
            if parentName:
                buff = parentName+"."+str(j)
            else:
                buff = str(j)
            child.NameRegions(buff)

    # Get a region by name, possibly looking recursively into composites
    def FindRegion(self, name):
        """Find the actual image ('this' if non-composite) and region id
        for the given region name.
        """
        id = self.GetRegionId(name)
        if id > -1:
            return self, id

        for child in self._children:
            actualImage, regionId = child.FindRegion(name)
            if actualImage:
                return actualImage, regionId

        return None, -1

    # Finds all region names for this image (composite or simple).
    def FindRegionNames(self):
        """Get a list of all region names for this image (composite or simple)."""
        list = []
        n = self.GetNumberOfTextRegions()
        for i in range(n):
            list.append(self.GetRegionName(i))

        for child in self._children:
            list += child.FindRegionNames()

        return list

    def AssignNewIds(self):
        """Assign new ids to this image and its children."""
        self._id = wx.NewId()
        for child in self._children:
            child.AssignNewIds()

    def OnDraw(self, dc):
        pass

    def OnMoveLinks(self, dc):
        # Want to set the ends of all attached links
        # to point to / from this object

        for line in self._lines:
            line.GetEventHandler().OnMoveLink(dc)

    def OnDrawContents(self, dc):
        if not self._regions:
            return
        
        bound_x, bound_y = self.GetBoundingBoxMin()

        if self._pen:
            dc.SetPen(self._pen)

        for region in self._regions:
            if region.GetFont():
                dc.SetFont(region.GetFont())

            dc.SetTextForeground(region.GetActualColourObject())
            dc.SetBackgroundMode(wx.TRANSPARENT)
            if not self._formatted:
                CentreText(dc, region.GetFormattedText(), self._xpos, self._ypos, bound_x - 2 * self._textMarginX, bound_y - 2 * self._textMarginY, region.GetFormatMode())
                self._formatted = True

            if not self.GetDisableLabel():
                DrawFormattedText(dc, region.GetFormattedText(), self._xpos, self._ypos, bound_x - 2 * self._textMarginX, bound_y - 2 * self._textMarginY, region.GetFormatMode())
            

    def DrawContents(self, dc):
        """Draw the internal graphic of the shape (such as text).

        Do not override this function: override OnDrawContents, which
        is called by this function.
        """
        self.GetEventHandler().OnDrawContents(dc)

    def OnSize(self, x, y):
        pass

    def OnMovePre(self, dc, x, y, old_x, old_y, display = True):
        return True

    def OnErase(self, dc):
        if not self._visible:
            return

        # Erase links
        for line in self._lines:
            line.GetEventHandler().OnErase(dc)

        self.GetEventHandler().OnEraseContents(dc)

    def OnEraseContents(self, dc):
        if not self._visible:
            return

        xp, yp = self.GetX(), self.GetY()
        minX, minY = self.GetBoundingBoxMin()
        maxX, maxY = self.GetBoundingBoxMax()

        topLeftX = xp - maxX / 2.0 - 2
        topLeftY = yp - maxY / 2.0 - 2

        penWidth = 0
        if self._pen:
            penWidth = self._pen.GetWidth()

        dc.SetPen(self.GetBackgroundPen())
        dc.SetBrush(self.GetBackgroundBrush())

        dc.DrawRectangle(topLeftX - penWidth, topLeftY - penWidth, maxX + penWidth * 2 + 4, maxY + penWidth * 2 + 4)

    def EraseLinks(self, dc, attachment = -1, recurse = False):
        """Erase links attached to this shape, but do not repair damage
        caused to other shapes.
        """
        if not self._visible:
            return

        for line in self._lines:
            if attachment == -1 or (line.GetTo() == self and line.GetAttachmentTo() == attachment or line.GetFrom() == self and line.GetAttachmentFrom() == attachment):
                line.GetEventHandler().OnErase(dc)

        if recurse:
            for child in self._children:
                child.EraseLinks(dc, attachment, recurse)

    def DrawLinks(self, dc, attachment = -1, recurse = False):
        """Draws any lines linked to this shape."""
        if not self._visible:
            return

        for line in self._lines:
            if attachment == -1 or (line.GetTo() == self and line.GetAttachmentTo() == attachment or line.GetFrom() == self and line.GetAttachmentFrom() == attachment):
                line.Draw(dc)
                
        if recurse:
            for child in self._children:
                child.DrawLinks(dc, attachment, recurse)

    #  Returns TRUE if pt1 <= pt2 in the sense that one point comes before
    #  another on an edge of the shape.
    # attachmentPoint is the attachment point (= side) in question.

    # This is the default, rectangular implementation.
    def AttachmentSortTest(self, attachmentPoint, pt1, pt2):
        """Return TRUE if pt1 is less than or equal to pt2, in the sense
        that one point comes before another on an edge of the shape.

        attachment is the attachment point (side) in question.

        This function is used in Shape.MoveLineToNewAttachment to determine
        the new line ordering.
        """
        physicalAttachment = self.LogicalToPhysicalAttachment(attachmentPoint)
        if physicalAttachment in [0, 2]:
            return pt1[0] <= pt2[0]
        elif physicalAttachment in [1, 3]:
            return pt1[1] <= pt2[1]

        return False

    def MoveLineToNewAttachment(self, dc, to_move, x, y):
        """Move the given line (which must already be attached to the shape)
        to a different attachment point on the shape, or a different order
        on the same attachment.

        Calls Shape.AttachmentSortTest and then
        ShapeEvtHandler.OnChangeAttachment.
        """
        if self.GetAttachmentMode() == ATTACHMENT_MODE_NONE:
            return False

        # Is (x, y) on this object? If so, find the new attachment point
        # the user has moved the point to
        hit = self.HitTest(x, y)
        if not hit:
            return False

        newAttachment, distance = hit
        
        self.EraseLinks(dc)

        if to_move.GetTo() == self:
            oldAttachment = to_move.GetAttachmentTo()
        else:
            oldAttachment = to_move.GetAttachmentFrom()

        # The links in a new ordering
        # First, add all links to the new list
        newOrdering = self._lines[:]
        
        # Delete the line object from the list of links; we're going to move
        # it to another position in the list
        del newOrdering[newOrdering.index(to_move)]

        old_x = -99999.9
        old_y = -99999.9

        found = False

        for line in newOrdering:
            if line.GetTo() == self and oldAttachment == line.GetAttachmentTo() or \
               line.GetFrom() == self and oldAttachment == line.GetAttachmentFrom():
                startX, startY, endX, endY = line.GetEnds()
                if line.GetTo() == self:
                    xp = endX
                    yp = endY
                else:
                    xp = startX
                    yp = startY

                thisPoint = wx.RealPoint(xp, yp)
                lastPoint = wx.RealPoint(old_x, old_y)
                newPoint = wx.RealPoint(x, y)

                if self.AttachmentSortTest(newAttachment, newPoint, thisPoint) and self.AttachmentSortTest(newAttachment, lastPoint, newPoint):
                    found = True
                    newOrdering.insert(newOrdering.index(line), to_move)

                old_x = xp
                old_y = yp
            if found:
                break

        if not found:
            newOrdering.append(to_move)

        self.GetEventHandler().OnChangeAttachment(newAttachment, to_move, newOrdering)
        return True

    def OnChangeAttachment(self, attachment, line, ordering):
        if line.GetTo() == self:
            line.SetAttachmentTo(attachment)
        else:
            line.SetAttachmentFrom(attachment)

        self.ApplyAttachmentOrdering(ordering)

        dc = wx.ClientDC(self.GetCanvas())
        self.GetCanvas().PrepareDC(dc)
        self.MoveLinks(dc)

        if not self.GetCanvas().GetQuickEditMode():
            self.GetCanvas().Redraw(dc)

    # Reorders the lines according to the given list
    def ApplyAttachmentOrdering(self, linesToSort):
        """Apply the line ordering in linesToSort to the shape, to reorder
        the way lines are attached.
        """
        linesStore = self._lines[:]

        self._lines = []

        for line in linesToSort:
            if line in linesStore:
                del linesStore[linesStore.index(line)]
                self._lines.append(line)

        # Now add any lines that haven't been listed in linesToSort
        self._lines += linesStore

    def SortLines(self, attachment, linesToSort):
        """ Reorder the lines coming into the node image at this attachment
        position, in the order in which they appear in linesToSort.

        Any remaining lines not in the list will be added to the end.
        """
        # This is a temporary store of all the lines at this attachment
        # point. We'll tick them off as we've processed them.
        linesAtThisAttachment = []

        for line in self._lines[:]:
            if line.GetTo() == self and line.GetAttachmentTo() == attachment or \
               line.GetFrom() == self and line.GetAttachmentFrom() == attachment:
                linesAtThisAttachment.append(line)
                del self._lines[self._lines.index(line)]

        for line in linesToSort:
            if line in linesAtThisAttachment:
                # Done this one
                del linesAtThisAttachment[linesAtThisAttachment.index(line)]
                self._lines.append(line)

        # Now add any lines that haven't been listed in linesToSort
        self._lines += linesAtThisAttachment

    def OnHighlight(self, dc):
        pass

    def OnLeftClick(self, x, y, keys = 0, attachment = 0):
        if self._sensitivity & OP_CLICK_LEFT != OP_CLICK_LEFT:
            if self._parent:
                attachment, dist = self._parent.HitTest(x, y)
                self._parent.GetEventHandler().OnLeftClick(x, y, keys, attachment)

    def OnRightClick(self, x, y, keys = 0, attachment = 0):
        if self._sensitivity & OP_CLICK_RIGHT != OP_CLICK_RIGHT:
            attachment, dist = self._parent.HitTest(x, y)
            self._parent.GetEventHandler().OnRightClick(x, y, keys, attachment)
            
    def OnDragLeft(self, draw, x, y, keys = 0, attachment = 0):
        if self._sensitivity & OP_DRAG_LEFT != OP_DRAG_LEFT:
            if self._parent:
                hit = self._parent.HitTest(x, y)
                if hit:
                    attachment, dist = hit
                self._parent.GetEventHandler().OnDragLeft(draw, x, y, keys, attachment)
            return

        dc = wx.ClientDC(self.GetCanvas())
        self.GetCanvas().PrepareDC(dc)
        dc.SetLogicalFunction(OGLRBLF)

        dottedPen = wx.Pen(wx.Colour(0, 0, 0), 1, wx.DOT)
        dc.SetPen(dottedPen)
        dc.SetBrush(wx.TRANSPARENT_BRUSH)

        xx = x + DragOffsetX
        yy = y + DragOffsetY

        xx, yy = self._canvas.Snap(xx, yy)
        w, h = self.GetBoundingBoxMax()
        self.GetEventHandler().OnDrawOutline(dc, xx, yy, w, h)

    def OnBeginDragLeft(self, x, y, keys = 0, attachment = 0):
        global DragOffsetX, DragOffsetY
        
        if self._sensitivity & OP_DRAG_LEFT != OP_DRAG_LEFT:
            if self._parent:
                hit = self._parent.HitTest(x, y)
                if hit:
                    attachment, dist = hit
                self._parent.GetEventHandler().OnBeginDragLeft(x, y, keys, attachment)
            return

        DragOffsetX = self._xpos - x
        DragOffsetY = self._ypos - y

        dc = wx.ClientDC(self.GetCanvas())
        self.GetCanvas().PrepareDC(dc)
        
        # New policy: don't erase shape until end of drag.
        # self.Erase(dc)
        xx = x + DragOffsetX
        yy = y + DragOffsetY
        xx, yy = self._canvas.Snap(xx, yy)
        dc.SetLogicalFunction(OGLRBLF)

        dottedPen = wx.Pen(wx.Colour(0, 0, 0), 1, wx.DOT)
        dc.SetPen(dottedPen)
        dc.SetBrush(wx.TRANSPARENT_BRUSH)

        w, h = self.GetBoundingBoxMax()
        self.GetEventHandler().OnDrawOutline(dc, xx, yy, w, h)
        self._canvas.CaptureMouse()

    def OnEndDragLeft(self, x, y, keys = 0, attachment = 0):
        if self._canvas.HasCapture():
            self._canvas.ReleaseMouse()
        if self._sensitivity & OP_DRAG_LEFT != OP_DRAG_LEFT:
            if self._parent:
                hit = self._parent.HitTest(x, y)
                if hit:
                    attachment, dist = hit
                self._parent.GetEventHandler().OnEndDragLeft(x, y, keys, attachment)
            return

        dc = wx.ClientDC(self.GetCanvas())
        self.GetCanvas().PrepareDC(dc)

        dc.SetLogicalFunction(wx.COPY)
        xx = x + DragOffsetX
        yy = y + DragOffsetY
        xx, yy = self._canvas.Snap(xx, yy)

        # New policy: erase shape at end of drag.
        self.Erase(dc)

        self.Move(dc, xx, yy)
        if self._canvas and not self._canvas.GetQuickEditMode():
            self._canvas.Redraw(dc)

    def OnDragRight(self, draw, x, y, keys = 0, attachment = 0):
        if self._sensitivity & OP_DRAG_RIGHT != OP_DRAG_RIGHT:
            if self._parent:
                attachment, dist = self._parent.HitTest(x, y)
                self._parent.GetEventHandler().OnDragRight(draw, x, y, keys, attachment)
            return

    def OnBeginDragRight(self, x, y, keys = 0, attachment = 0):
        if self._sensitivity & OP_DRAG_RIGHT != OP_DRAG_RIGHT:
            if self._parent:
                attachment, dist = self._parent.HitTest(x, y)
                self._parent.GetEventHandler().OnBeginDragRight(x, y, keys, attachment)
            return

    def OnEndDragRight(self, x, y, keys = 0, attachment = 0):
        if self._sensitivity & OP_DRAG_RIGHT != OP_DRAG_RIGHT:
            if self._parent:
                attachment, dist = self._parent.HitTest(x, y)
                self._parent.GetEventHandler().OnEndDragRight(x, y, keys, attachment)
            return

    def OnDrawOutline(self, dc, x, y, w, h):
        points = [[x - w / 2.0, y - h / 2.0],
                [x + w / 2.0, y - h / 2.0],
                [x + w / 2.0, y + h / 2.0],
                [x - w / 2.0, y + h / 2.0],
                [x - w / 2.0, y - h / 2.0],
                ]

        dc.DrawLines(points)
        
    def Attach(self, can):
        """Set the shape's internal canvas pointer to point to the given canvas."""
        self._canvas = can

    def Detach(self):
        """Disassociates the shape from its canvas."""
        self._canvas = None

    def Move(self, dc, x, y, display = True):
        """Move the shape to the given position.
        Redraw if display is TRUE.
        """
        old_x = self._xpos
        old_y = self._ypos

        if not self.GetEventHandler().OnMovePre(dc, x, y, old_x, old_y, display):
            return

        self._xpos, self._ypos = x, y

        self.ResetControlPoints()

        if display:
            self.Draw(dc)

        self.MoveLinks(dc)

        self.GetEventHandler().OnMovePost(dc, x, y, old_x, old_y, display)

    def MoveLinks(self, dc):
        """Redraw all the lines attached to the shape."""
        self.GetEventHandler().OnMoveLinks(dc)

    def Draw(self, dc):
        """Draw the whole shape and any lines attached to it.

        Do not override this function: override OnDraw, which is called
        by this function.
        """
        if self._visible:
            self.GetEventHandler().OnDraw(dc)
            self.GetEventHandler().OnDrawContents(dc)
            self.GetEventHandler().OnDrawControlPoints(dc)
            self.GetEventHandler().OnDrawBranches(dc)

    def Flash(self):
        """Flash the shape."""
        if self.GetCanvas():
            dc = wx.ClientDC(self.GetCanvas())
            self.GetCanvas().PrepareDC(dc)

            dc.SetLogicalFunction(OGLRBLF)
            self.Draw(dc)
            dc.SetLogicalFunction(wx.COPY)
            self.Draw(dc)

    def Show(self, show):
        """Set a flag indicating whether the shape should be drawn."""
        self._visible = show
        for child in self._children:
            child.Show(show)

    def Erase(self, dc):
        """Erase the shape.
        Does not repair damage caused to other shapes.
        """
        self.GetEventHandler().OnErase(dc)
        self.GetEventHandler().OnEraseControlPoints(dc)
        self.GetEventHandler().OnDrawBranches(dc, erase = True)

    def EraseContents(self, dc):
        """Erase the shape contents, that is, the area within the shape's
        minimum bounding box.
        """
        self.GetEventHandler().OnEraseContents(dc)

    def AddText(self, string):
        """Add a line of text to the shape's default text region."""
        if not self._regions:
            return

        region = self._regions[0]
        #region.ClearText()
        new_line = ShapeTextLine(0, 0, string)
        text = region.GetFormattedText()
        text.append(new_line)

        self._formatted = False

    def SetSize(self, x, y, recursive = True):
        """Set the shape's size."""
        self.SetAttachmentSize(x, y)
        self.SetDefaultRegionSize()

    def SetAttachmentSize(self, w, h):
        width, height = self.GetBoundingBoxMin()
        if width == 0:
            scaleX = 1.0
        else:
            scaleX = float(w) / width
        if height == 0:
            scaleY = 1.0
        else:
            scaleY = float(h) / height

        for point in self._attachmentPoints:
            point._x = point._x * scaleX
            point._y = point._y * scaleY

    # Add line FROM this object
    def AddLine(self, line, other, attachFrom = 0, attachTo = 0, positionFrom = -1, positionTo = -1):
        """Add a line between this shape and the given other shape, at the
        specified attachment points.

        The position in the list of lines at each end can also be specified,
        so that the line will be drawn at a particular point on its attachment
        point.
        """
        if positionFrom == -1:
            if not line in self._lines:
                self._lines.append(line)
        else:
            # Don't preserve old ordering if we have new ordering instructions
            try:
                self._lines.remove(line)
            except ValueError:
                pass
            if positionFrom < len(self._lines):
                self._lines.insert(positionFrom, line)
            else:
                self._lines.append(line)

        if positionTo == -1:
            if not other in other._lines:
                other._lines.append(line)
        else:
            # Don't preserve old ordering if we have new ordering instructions
            try:
                other._lines.remove(line)
            except ValueError:
                pass
            if positionTo < len(other._lines):
                other._lines.insert(positionTo, line)
            else:
                other._lines.append(line)
            
        line.SetFrom(self)
        line.SetTo(other)
        line.SetAttachments(attachFrom, attachTo)

        dc = wx.ClientDC(self._canvas)
        self._canvas.PrepareDC(dc)
        self.MoveLinks(dc)
        
    def RemoveLine(self, line):
        """Remove the given line from the shape's list of attached lines."""
        if line.GetFrom() == self:
            line.GetTo()._lines.remove(line)
        else:
            line.GetFrom()._lines.remove(line)

        self._lines.remove(line)

    # Default - make 6 control points
    def MakeControlPoints(self):
        """Make a list of control points (draggable handles) appropriate to
        the shape.
        """
        maxX, maxY = self.GetBoundingBoxMax()
        minX, minY = self.GetBoundingBoxMin()

        widthMin = minX + CONTROL_POINT_SIZE + 2
        heightMin = minY + CONTROL_POINT_SIZE + 2

        # Offsets from main object
        top = -heightMin / 2.0
        bottom = heightMin / 2.0 + (maxY - minY)
        left = -widthMin / 2.0
        right = widthMin / 2.0 + (maxX - minX)

        control = ControlPoint(self._canvas, self, CONTROL_POINT_SIZE, left, top, CONTROL_POINT_DIAGONAL)
        self._canvas.AddShape(control)
        self._controlPoints.append(control)

        control = ControlPoint(self._canvas, self, CONTROL_POINT_SIZE, 0, top, CONTROL_POINT_VERTICAL)
        self._canvas.AddShape(control)
        self._controlPoints.append(control)

        control = ControlPoint(self._canvas, self, CONTROL_POINT_SIZE, right, top, CONTROL_POINT_DIAGONAL)
        self._canvas.AddShape(control)
        self._controlPoints.append(control)

        control = ControlPoint(self._canvas, self, CONTROL_POINT_SIZE, right, 0, CONTROL_POINT_HORIZONTAL)
        self._canvas.AddShape(control)
        self._controlPoints.append(control)

        control = ControlPoint(self._canvas, self, CONTROL_POINT_SIZE, right, bottom, CONTROL_POINT_DIAGONAL)
        self._canvas.AddShape(control)
        self._controlPoints.append(control)

        control = ControlPoint(self._canvas, self, CONTROL_POINT_SIZE, 0, bottom, CONTROL_POINT_VERTICAL)
        self._canvas.AddShape(control)
        self._controlPoints.append(control)

        control = ControlPoint(self._canvas, self, CONTROL_POINT_SIZE, left, bottom, CONTROL_POINT_DIAGONAL)
        self._canvas.AddShape(control)
        self._controlPoints.append(control)

        control = ControlPoint(self._canvas, self, CONTROL_POINT_SIZE, left, 0, CONTROL_POINT_HORIZONTAL)
        self._canvas.AddShape(control)
        self._controlPoints.append(control)

    def MakeMandatoryControlPoints(self):
        """Make the mandatory control points.

        For example, the control point on a dividing line should appear even
        if the divided rectangle shape's handles should not appear (because
        it is the child of a composite, and children are not resizable).
        """
        for child in self._children:
            child.MakeMandatoryControlPoints()

    def ResetMandatoryControlPoints(self):
        """Reset the mandatory control points."""
        for child in self._children:
            child.ResetMandatoryControlPoints()

    def ResetControlPoints(self):
        """Reset the positions of the control points (for instance when the
        shape's shape has changed).
        """
        self.ResetMandatoryControlPoints()

        if len(self._controlPoints) == 0:
            return

        maxX, maxY = self.GetBoundingBoxMax()
        minX, minY = self.GetBoundingBoxMin()

        widthMin = minX + CONTROL_POINT_SIZE + 2
        heightMin = minY + CONTROL_POINT_SIZE + 2
        
        # Offsets from main object
        top = -heightMin / 2.0
        bottom = heightMin / 2.0 + (maxY - minY)
        left = -widthMin / 2.0
        right = widthMin / 2.0 + (maxX - minX)

        self._controlPoints[0]._xoffset = left
        self._controlPoints[0]._yoffset = top

        self._controlPoints[1]._xoffset = 0
        self._controlPoints[1]._yoffset = top

        self._controlPoints[2]._xoffset = right
        self._controlPoints[2]._yoffset = top

        self._controlPoints[3]._xoffset = right
        self._controlPoints[3]._yoffset = 0

        self._controlPoints[4]._xoffset = right
        self._controlPoints[4]._yoffset = bottom

        self._controlPoints[5]._xoffset = 0
        self._controlPoints[5]._yoffset = bottom

        self._controlPoints[6]._xoffset = left
        self._controlPoints[6]._yoffset = bottom

        self._controlPoints[7]._xoffset = left
        self._controlPoints[7]._yoffset = 0

    def DeleteControlPoints(self, dc = None):
        """Delete the control points (or handles) for the shape.

        Does not redraw the shape.
        """
        for control in self._controlPoints[:]:
            if dc:
                control.GetEventHandler().OnErase(dc)
            control.Delete()
            self._controlPoints.remove(control)
        self._controlPoints = []
        
        # Children of divisions are contained objects,
        # so stop here
        if not isinstance(self, DivisionShape):
            for child in self._children:
                child.DeleteControlPoints(dc)

    def OnDrawControlPoints(self, dc):
        if not self._drawHandles:
            return

        dc.SetBrush(wx.BLACK_BRUSH)
        dc.SetPen(wx.BLACK_PEN)

        for control in self._controlPoints:
            control.Draw(dc)

        # Children of divisions are contained objects,
        # so stop here.
        # This test bypasses the type facility for speed
        # (critical when drawing)

        if not isinstance(self, DivisionShape):
            for child in self._children:
                child.GetEventHandler().OnDrawControlPoints(dc)

    def OnEraseControlPoints(self, dc):
        for control in self._controlPoints:
            control.Erase(dc)

        if not isinstance(self, DivisionShape):
            for child in self._children:
                child.GetEventHandler().OnEraseControlPoints(dc)

    def Select(self, select, dc = None):
        """Select or deselect the given shape, drawing or erasing control points
        (handles) as necessary.
        """
        self._selected = select
        if select:
            self.MakeControlPoints()
            # Children of divisions are contained objects,
            # so stop here
            if not isinstance(self, DivisionShape):
                for child in self._children:
                    child.MakeMandatoryControlPoints()
            if dc:
                self.GetEventHandler().OnDrawControlPoints(dc)
        else:
            self.DeleteControlPoints(dc)
            if not isinstance(self, DivisionShape):
                for child in self._children:
                    child.DeleteControlPoints(dc)

    def Selected(self):
        """TRUE if the shape is currently selected."""
        return self._selected

    def AncestorSelected(self):
        """TRUE if the shape's ancestor is currently selected."""
        if self._selected:
            return True
        if not self.GetParent():
            return False
        return self.GetParent().AncestorSelected()

    def GetNumberOfAttachments(self):
        """Get the number of attachment points for this shape."""
        # Should return the MAXIMUM attachment point id here,
        # so higher-level functions can iterate through all attachments,
        # even if they're not contiguous.

        if len(self._attachmentPoints) == 0:
            return 4
        else:
            maxN = 3
            for point in self._attachmentPoints:
                if point._id > maxN:
                    maxN = point._id
            return maxN + 1

    def AttachmentIsValid(self, attachment):
        """TRUE if attachment is a valid attachment point."""
        if len(self._attachmentPoints) == 0:
            return attachment in range(4)

        for point in self._attachmentPoints:
            if point._id == attachment:
                return True
        return False

    def GetAttachmentPosition(self, attachment, nth = 0, no_arcs = 1, line = None):
        """Get the position at which the given attachment point should be drawn.

        If attachment isn't found among the attachment points of the shape,
        returns None.
        """
        if self._attachmentMode == ATTACHMENT_MODE_NONE:
            return self._xpos, self._ypos
        elif self._attachmentMode == ATTACHMENT_MODE_BRANCHING:
            pt, stemPt = self.GetBranchingAttachmentPoint(attachment, nth)
            return pt[0], pt[1]
        elif self._attachmentMode == ATTACHMENT_MODE_EDGE:
            if len(self._attachmentPoints):
                for point in self._attachmentPoints:
                    if point._id == attachment:
                        return self._xpos + point._x, self._ypos + point._y
                return None
            else:
                # Assume is rectangular
                w, h = self.GetBoundingBoxMax()
                top = self._ypos + h / 2.0
                bottom = self._ypos - h / 2.0
                left = self._xpos - w / 2.0
                right = self._xpos + w / 2.0

                # wtf?
                line and line.IsEnd(self)

                physicalAttachment = self.LogicalToPhysicalAttachment(attachment)

                # Simplified code
                if physicalAttachment == 0:
                    pt = self.CalcSimpleAttachment((left, bottom), (right, bottom), nth, no_arcs, line)
                elif physicalAttachment == 1:
                    pt = self.CalcSimpleAttachment((right, bottom), (right, top), nth, no_arcs, line)
                elif physicalAttachment == 2:
                    pt = self.CalcSimpleAttachment((left, top), (right, top), nth, no_arcs, line)
                elif physicalAttachment == 3:
                    pt = self.CalcSimpleAttachment((left, bottom), (left, top), nth, no_arcs, line)
                else:
                    return None
                return pt[0], pt[1]
        return None

    def GetBoundingBoxMax(self):
        """Get the maximum bounding box for the shape, taking into account
        external features such as shadows.
        """
        ww, hh = self.GetBoundingBoxMin()
        if self._shadowMode != SHADOW_NONE:
            ww += self._shadowOffsetX
            hh += self._shadowOffsetY
        return ww, hh

    def GetBoundingBoxMin(self):
        """Get the minimum bounding box for the shape, that defines the area
        available for drawing the contents (such as text).

        Must be overridden.
        """
        return 0, 0
    
    def HasDescendant(self, image):
        """TRUE if image is a descendant of this composite."""
        if image == self:
            return True
        for child in self._children:
            if child.HasDescendant(image):
                return True
        return False

    # Assuming the attachment lies along a vertical or horizontal line,
    # calculate the position on that point.
    def CalcSimpleAttachment(self, pt1, pt2, nth, noArcs, line):
        """Assuming the attachment lies along a vertical or horizontal line,
        calculate the position on that point.

        Parameters:

        pt1
            The first point of the line repesenting the edge of the shape.

        pt2
            The second point of the line representing the edge of the shape.

        nth
            The position on the edge (for example there may be 6 lines at
            this attachment point, and this may be the 2nd line.

        noArcs
            The number of lines at this edge.

        line
            The line shape.

        Remarks

        This function expects the line to be either vertical or horizontal,
        and determines which.
        """
        isEnd = line and line.IsEnd(self)

        # Are we horizontal or vertical?
        isHorizontal = RoughlyEqual(pt1[1], pt2[1])

        if isHorizontal:
            if pt1[0] > pt2[0]:
                firstPoint = pt2
                secondPoint = pt1
            else:
                firstPoint = pt1
                secondPoint = pt2

            if self._spaceAttachments:
                if line and line.GetAlignmentType(isEnd) == LINE_ALIGNMENT_TO_NEXT_HANDLE:
                    # Align line according to the next handle along
                    point = line.GetNextControlPoint(self)
                    if point[0] < firstPoint[0]:
                        x = firstPoint[0]
                    elif point[0] > secondPoint[0]:
                        x = secondPoint[0]
                    else:
                        x = point[0]
                else:
                    x = firstPoint[0] + (nth + 1) * (secondPoint[0] - firstPoint[0]) / (noArcs + 1.0)
            else:
                x = (secondPoint[0] - firstPoint[0]) / 2.0 # Midpoint
            y = pt1[1]
        else:
            assert RoughlyEqual(pt1[0], pt2[0])

            if pt1[1] > pt2[1]:
                firstPoint = pt2
                secondPoint = pt1
            else:
                firstPoint = pt1
                secondPoint = pt2

            if self._spaceAttachments:
                if line and line.GetAlignmentType(isEnd) == LINE_ALIGNMENT_TO_NEXT_HANDLE:
                    # Align line according to the next handle along
                    point = line.GetNextControlPoint(self)
                    if point[1] < firstPoint[1]:
                        y = firstPoint[1]
                    elif point[1] > secondPoint[1]:
                        y = secondPoint[1]
                    else:
                        y = point[1]
                else:
                    y = firstPoint[1] + (nth + 1) * (secondPoint[1] - firstPoint[1]) / (noArcs + 1.0)
            else:
                y = (secondPoint[1] - firstPoint[1]) / 2.0 # Midpoint
            x = pt1[0]

        return x, y

    # Return the zero-based position in m_lines of line
    def GetLinePosition(self, line):
        """Get the zero-based position of line in the list of lines
        for this shape.
        """
        try:
            return self._lines.index(line)
        except:
            return 0


    #            |________|
    #                 | <- root
    #                 | <- neck
    # shoulder1 ->---------<- shoulder2
    #             | | | | |
    #                      <- branching attachment point N-1

    def GetBranchingAttachmentInfo(self, attachment):
        """Get information about where branching connections go.
        
        Returns FALSE if there are no lines at this attachment.
        """
        physicalAttachment = self.LogicalToPhysicalAttachment(attachment)

        # Number of lines at this attachment
        lineCount = self.GetAttachmentLineCount(attachment)

        if not lineCount:
            return False

        totalBranchLength = self._branchSpacing * (lineCount - 1)
        root = self.GetBranchingAttachmentRoot(attachment)

        neck = wx.RealPoint()
        shoulder1 = wx.RealPoint()
        shoulder2 = wx.RealPoint()
        
        # Assume that we have attachment points 0 to 3: top, right, bottom, left
        if physicalAttachment == 0:
            neck[0] = self.GetX()
            neck[1] = root[1] - self._branchNeckLength

            shoulder1[0] = root[0] - totalBranchLength / 2.0
            shoulder2[0] = root[0] + totalBranchLength / 2.0

            shoulder1[1] = neck[1]
            shoulder2[1] = neck[1]
        elif physicalAttachment == 1:
            neck[0] = root[0] + self._branchNeckLength
            neck[1] = root[1]
            
            shoulder1[0] = neck[0]
            shoulder2[0] = neck[0]

            shoulder1[1] = neck[1] - totalBranchLength / 2.0
            shoulder1[1] = neck[1] + totalBranchLength / 2.0
        elif physicalAttachment == 2:
            neck[0] = self.GetX()
            neck[1] = root[1] + self._branchNeckLength

            shoulder1[0] = root[0] - totalBranchLength / 2.0
            shoulder2[0] = root[0] + totalBranchLength / 2.0

            shoulder1[1] = neck[1]
            shoulder2[1] = neck[1]
        elif physicalAttachment == 3:
            neck[0] = root[0] - self._branchNeckLength
            neck[1] = root[1]

            shoulder1[0] = neck[0]
            shoulder2[0] = neck[0]

            shoulder1[1] = neck[1] - totalBranchLength / 2.0
            shoulder2[1] = neck[1] + totalBranchLength / 2.0
        else:
            raise Exception, "Unrecognised attachment point in GetBranchingAttachmentInfo"
        return root, neck, shoulder1, shoulder2

    def GetBranchingAttachmentPoint(self, attachment, n):
        physicalAttachment = self.LogicalToPhysicalAttachment(attachment)

        root, neck, shoulder1, shoulder2 = self.GetBranchingAttachmentInfo(attachment)
        pt = wx.RealPoint()
        stemPt = wx.RealPoint()

        if physicalAttachment == 0:
            pt[1] = neck[1] - self._branchStemLength
            pt[0] = shoulder1[0] + n * self._branchSpacing

            stemPt[0] = pt[0]
            stemPt[1] = neck[1]
        elif physicalAttachment == 2:
            pt[1] = neck[1] + self._branchStemLength
            pt[0] = shoulder1[0] + n * self._branchStemLength
            
            stemPt[0] = pt[0]
            stemPt[1] = neck[1]
        elif physicalAttachment == 1:
            pt[0] = neck[0] + self._branchStemLength
            pt[1] = shoulder1[1] + n * self._branchSpacing

            stemPt[0] = neck[0]
            stemPt[1] = pt[1]
        elif physicalAttachment == 3:
            pt[0] = neck[0] - self._branchStemLength
            pt[1] = shoulder1[1] + n * self._branchSpacing

            stemPt[0] = neck[0]
            stemPt[1] = pt[1]
        else:
            raise Exception, "Unrecognised attachment point in GetBranchingAttachmentPoint"

        return pt, stemPt

    def GetAttachmentLineCount(self, attachment):
        """Get the number of lines at this attachment position."""
        count = 0
        for lineShape in self._lines:
            if lineShape.GetFrom() == self and lineShape.GetAttachmentFrom() == attachment:
                count += 1
            elif lineShape.GetTo() == self and lineShape.GetAttachmentTo() == attachment:
                count += 1
        return count
    
    def GetBranchingAttachmentRoot(self, attachment):
        """Get the root point at the given attachment."""
        physicalAttachment = self.LogicalToPhysicalAttachment(attachment)

        root = wx.RealPoint()

        width, height = self.GetBoundingBoxMax()

        # Assume that we have attachment points 0 to 3: top, right, bottom, left
        if physicalAttachment == 0:
            root[0] = self.GetX()
            root[1] = self.GetY() - height / 2.0
        elif physicalAttachment == 1:
            root[0] = self.GetX() + width / 2.0
            root[1] = self.GetY()
        elif physicalAttachment == 2:
            root[0] = self.GetX()
            root[1] = self.GetY() + height / 2.0
        elif physicalAttachment == 3:
            root[0] = self.GetX() - width / 2.0
            root[1] = self.GetY()
        else:
            raise Exception, "Unrecognised attachment point in GetBranchingAttachmentRoot"

        return root

    # Draw or erase the branches (not the actual arcs though)
    def OnDrawBranchesAttachment(self, dc, attachment, erase = False):
        count = self.GetAttachmentLineCount(attachment)
        if count == 0:
            return

        root, neck, shoulder1, shoulder2 = self.GetBranchingAttachmentInfo(attachment)

        if erase:
            dc.SetPen(wx.WHITE_PEN)
            dc.SetBrush(wx.WHITE_BRUSH)
        else:
            dc.SetPen(wx.BLACK_PEN)
            dc.SetBrush(wx.BLACK_BRUSH)

        # Draw neck
        dc.DrawLine(root[0], root[1], neck[0], neck[1])

        if count > 1:
            # Draw shoulder-to-shoulder line
            dc.DrawLine(shoulder1[0], shoulder1[1], shoulder2[0], shoulder2[1])
        # Draw all the little branches
        for i in range(count):
            pt, stemPt = self.GetBranchingAttachmentPoint(attachment, i)
            dc.DrawLine(stemPt[0], stemPt[1], pt[0], pt[1])

            if self.GetBranchStyle() & BRANCHING_ATTACHMENT_BLOB and count > 1:
                blobSize = 6.0
                dc.DrawEllipse(stemPt[0] - blobSize / 2.0, stemPt[1] - blobSize / 2.0, blobSize, blobSize)

    def OnDrawBranches(self, dc, erase = False):
        if self._attachmentMode != ATTACHMENT_MODE_BRANCHING:
            return
        for i in range(self.GetNumberOfAttachments()):
            self.OnDrawBranchesAttachment(dc, i, erase)

    def GetAttachmentPositionEdge(self, attachment, nth = 0, no_arcs = 1, line = None):
        """ Only get the attachment position at the _edge_ of the shape,
        ignoring branching mode. This is used e.g. to indicate the edge of
        interest, not the point on the attachment branch.
        """
        oldMode = self._attachmentMode

        # Calculate as if to edge, not branch
        if self._attachmentMode == ATTACHMENT_MODE_BRANCHING:
            self._attachmentMode = ATTACHMENT_MODE_EDGE
        res = self.GetAttachmentPosition(attachment, nth, no_arcs, line)
        self._attachmentMode = oldMode

        return res

    def PhysicalToLogicalAttachment(self, physicalAttachment):
        """ Rotate the standard attachment point from physical
        (0 is always North) to logical (0 -> 1 if rotated by 90 degrees)
        """
        if RoughlyEqual(self.GetRotation(), 0):
            i = physicalAttachment
        elif RoughlyEqual(self.GetRotation(), math.pi / 2.0):
            i = physicalAttachment - 1
        elif RoughlyEqual(self.GetRotation(), math.pi):
            i = physicalAttachment - 2
        elif RoughlyEqual(self.GetRotation(), 3 * math.pi / 2.0):
            i = physicalAttachment - 3
        else:
            # Can't handle -- assume the same
            return physicalAttachment

        if i < 0:
            i += 4

        return i

    def LogicalToPhysicalAttachment(self, logicalAttachment):
        """Rotate the standard attachment point from logical
        to physical (0 is always North).
        """
        if RoughlyEqual(self.GetRotation(), 0):
            i = logicalAttachment
        elif RoughlyEqual(self.GetRotation(), math.pi / 2.0):
            i = logicalAttachment + 1
        elif RoughlyEqual(self.GetRotation(), math.pi):
            i = logicalAttachment + 2
        elif RoughlyEqual(self.GetRotation(), 3 * math.pi / 2.0):
            i = logicalAttachment + 3
        else:
            return logicalAttachment

        if i > 3:
            i -= 4

        return i

    def Rotate(self, x, y, theta):
        """Rotate about the given axis by the given amount in radians."""
        self._rotation = theta
        if self._rotation < 0:
            self._rotation += 2 * math.pi
        elif self._rotation > 2 * math.pi:
            self._rotation -= 2 * math.pi

    def GetBackgroundPen(self):
        """Return pen of the right colour for the background."""
        if self.GetCanvas():
            return wx.Pen(self.GetCanvas().GetBackgroundColour(), 1, wx.SOLID)
        return WhiteBackgroundPen

    def GetBackgroundBrush(self):
        """Return brush of the right colour for the background."""
        if self.GetCanvas():
            return wx.Brush(self.GetCanvas().GetBackgroundColour(), wx.SOLID)
        return WhiteBackgroundBrush

    def GetX(self):
        """Get the x position of the centre of the shape."""
        return self._xpos

    def GetY(self):
        """Get the y position of the centre of the shape."""
        return self._ypos

    def SetX(self, x):
        """Set the x position of the shape."""
        self._xpos = x

    def SetY(self, y):
        """Set the y position of the shape."""
        self._ypos = y

    def GetParent(self):
        """Return the parent of this shape, if it is part of a composite."""
        return self._parent

    def SetParent(self, p):
        self._parent = p

    def GetChildren(self):
        """Return the list of children for this shape."""
        return self._children

    def GetDrawHandles(self):
        """Return the list of drawhandles."""
        return self._drawHandles

    def GetEventHandler(self):
        """Return the event handler for this shape."""
        return self._eventHandler

    def SetEventHandler(self, handler):
        """Set the event handler for this shape."""
        self._eventHandler = handler

    def Recompute(self):
        """Recomputes any constraints associated with the shape.

        Normally applicable to CompositeShapes only, but harmless for
        other classes of Shape.
        """
        return True

    def IsHighlighted(self):
        """TRUE if the shape is highlighted. Shape highlighting is unimplemented."""
        return self._highlighted

    def GetSensitivityFilter(self):
        """Return the sensitivity filter, a bitlist of values.

        See Shape.SetSensitivityFilter.
        """
        return self._sensitivity

    def SetFixedSize(self, x, y):
        """Set the shape to be fixed size."""
        self._fixedWidth = x
        self._fixedHeight = y

    def GetFixedSize(self):
        """Return flags indicating whether the shape is of fixed size in
        either direction.
        """
        return self._fixedWidth, self._fixedHeight

    def GetFixedWidth(self):
        """TRUE if the shape cannot be resized in the horizontal plane."""
        return self._fixedWidth

    def GetFixedHeight(self):
        """TRUE if the shape cannot be resized in the vertical plane."""
        return self._fixedHeight
    
    def SetSpaceAttachments(self, sp):
        """Indicate whether lines should be spaced out evenly at the point
        they touch the node (sp = True), or whether they should join at a single
        point (sp = False).
        """
        self._spaceAttachments = sp

    def GetSpaceAttachments(self):
        """Return whether lines should be spaced out evenly at the point they
        touch the node (True), or whether they should join at a single point
        (False).
        """
        return self._spaceAttachments

    def SetCentreResize(self, cr):
        """Specify whether the shape is to be resized from the centre (the
        centre stands still) or from the corner or side being dragged (the
        other corner or side stands still).
        """
        self._centreResize = cr

    def GetCentreResize(self):
        """TRUE if the shape is to be resized from the centre (the centre stands
        still), or FALSE if from the corner or side being dragged (the other
        corner or side stands still)
        """
        return self._centreResize

    def SetMaintainAspectRatio(self, ar):
        """Set whether a shape that resizes should not change the aspect ratio
        (width and height should be in the original proportion).
        """
        self._maintainAspectRatio = ar

    def GetMaintainAspectRatio(self):
        """TRUE if shape keeps aspect ratio during resize."""
        return self._maintainAspectRatio

    def GetLines(self):
        """Return the list of lines connected to this shape."""
        return self._lines

    def SetDisableLabel(self, flag):
        """Set flag to TRUE to stop the default region being shown."""
        self._disableLabel = flag

    def GetDisableLabel(self):
        """TRUE if the default region will not be shown, FALSE otherwise."""
        return self._disableLabel

    def SetAttachmentMode(self, mode):
        """Set the attachment mode.

        If TRUE, attachment points will be significant when drawing lines to
        and from this shape.
        If FALSE, lines will be drawn as if to the centre of the shape.
        """
        self._attachmentMode = mode

    def GetAttachmentMode(self):
        """Return the attachment mode.

        See Shape.SetAttachmentMode.
        """
        return self._attachmentMode

    def SetId(self, i):
        """Set the integer identifier for this shape."""
        self._id = i

    def GetId(self):
        """Return the integer identifier for this shape."""
        return self._id

    def IsShown(self):
        """TRUE if the shape is in a visible state, FALSE otherwise.

        Note that this has nothing to do with whether the window is hidden
        or the shape has scrolled off the canvas; it refers to the internal
        visibility flag.
        """
        return self._visible

    def GetPen(self):
        """Return the pen used for drawing the shape's outline."""
        return self._pen

    def GetBrush(self):
        """Return the brush used for filling the shape."""
        return self._brush

    def GetNumberOfTextRegions(self):
        """Return the number of text regions for this shape."""
        return len(self._regions)

    def GetRegions(self):
        """Return the list of ShapeRegions."""
        return self._regions

    # Control points ('handles') redirect control to the actual shape, to
    # make it easier to override sizing behaviour.
    def OnSizingDragLeft(self, pt, draw, x, y, keys = 0, attachment = 0):
        bound_x, bound_y = self.GetBoundingBoxMin()

        dc = wx.ClientDC(self.GetCanvas())
        self.GetCanvas().PrepareDC(dc)

        dc.SetLogicalFunction(OGLRBLF)

        dottedPen = wx.Pen(wx.Colour(0, 0, 0), 1, wx.DOT)
        dc.SetPen(dottedPen)
        dc.SetBrush(wx.TRANSPARENT_BRUSH)

        if self.GetCentreResize():
            # Maintain the same centre point
            new_width = 2.0 * abs(x - self.GetX())
            new_height = 2.0 * abs(y - self.GetY())

            # Constrain sizing according to what control point you're dragging
            if pt._type == CONTROL_POINT_HORIZONTAL:
                if self.GetMaintainAspectRatio():
                    new_height = bound_y * (new_width / bound_x)
                else:
                    new_height = bound_y
            elif pt._type == CONTROL_POINT_VERTICAL:
                if self.GetMaintainAspectRatio():
                    new_width = bound_x * (new_height / bound_y)
                else:
                    new_width = bound_x
            elif pt._type == CONTROL_POINT_DIAGONAL and (keys & KEY_SHIFT):
                new_height = bound_y * (new_width / bound_x)

            if self.GetFixedWidth():
                new_width = bound_x

            if self.GetFixedHeight():
                new_height = bound_y

            pt._controlPointDragEndWidth = new_width
            pt._controlPointDragEndHeight = new_height

            self.GetEventHandler().OnDrawOutline(dc, self.GetX(), self.GetY(), new_width, new_height)
        else:
            # Don't maintain the same centre point
            newX1 = min(pt._controlPointDragStartX, x)
            newY1 = min(pt._controlPointDragStartY, y)
            newX2 = max(pt._controlPointDragStartX, x)
            newY2 = max(pt._controlPointDragStartY, y)
            if pt._type == CONTROL_POINT_HORIZONTAL:
                newY1 = pt._controlPointDragStartY
                newY2 = newY1 + pt._controlPointDragStartHeight
            elif pt._type == CONTROL_POINT_VERTICAL:
                newX1 = pt._controlPointDragStartX
                newX2 = newX1 + pt._controlPointDragStartWidth
            elif pt._type == CONTROL_POINT_DIAGONAL and (keys & KEY_SHIFT or self.GetMaintainAspectRatio()):
                newH = (newX2 - newX1) * (float(pt._controlPointDragStartHeight) / pt._controlPointDragStartWidth)
                if self.GetY() > pt._controlPointDragStartY:
                    newY2 = newY1 + newH
                else:
                    newY1 = newY2 - newH

            newWidth = float(newX2 - newX1)
            newHeight = float(newY2 - newY1)

            if pt._type == CONTROL_POINT_VERTICAL and self.GetMaintainAspectRatio():
                newWidth = bound_x * (newHeight / bound_y)

            if pt._type == CONTROL_POINT_HORIZONTAL and self.GetMaintainAspectRatio():
                newHeight = bound_y * (newWidth / bound_x)

            pt._controlPointDragPosX = newX1 + newWidth / 2.0
            pt._controlPointDragPosY = newY1 + newHeight / 2.0
            if self.GetFixedWidth():
                newWidth = bound_x

            if self.GetFixedHeight():
                newHeight = bound_y

            pt._controlPointDragEndWidth = newWidth
            pt._controlPointDragEndHeight = newHeight
            self.GetEventHandler().OnDrawOutline(dc, pt._controlPointDragPosX, pt._controlPointDragPosY, newWidth, newHeight)

    def OnSizingBeginDragLeft(self, pt, x, y, keys = 0, attachment = 0):
        self._canvas.CaptureMouse()

        dc = wx.ClientDC(self.GetCanvas())
        self.GetCanvas().PrepareDC(dc)

        dc.SetLogicalFunction(OGLRBLF)

        bound_x, bound_y = self.GetBoundingBoxMin()
        self.GetEventHandler().OnBeginSize(bound_x, bound_y)

        # Choose the 'opposite corner' of the object as the stationary
        # point in case this is non-centring resizing.
        if pt.GetX() < self.GetX():
            pt._controlPointDragStartX = self.GetX() + bound_x / 2.0
        else:
            pt._controlPointDragStartX = self.GetX() - bound_x / 2.0

        if pt.GetY() < self.GetY():
            pt._controlPointDragStartY = self.GetY() + bound_y / 2.0
        else:
            pt._controlPointDragStartY = self.GetY() - bound_y / 2.0

        if pt._type == CONTROL_POINT_HORIZONTAL:
            pt._controlPointDragStartY = self.GetY() - bound_y / 2.0
        elif pt._type == CONTROL_POINT_VERTICAL:
            pt._controlPointDragStartX = self.GetX() - bound_x / 2.0

        # We may require the old width and height
        pt._controlPointDragStartWidth = bound_x
        pt._controlPointDragStartHeight = bound_y

        dottedPen = wx.Pen(wx.Colour(0, 0, 0), 1, wx.DOT)
        dc.SetPen(dottedPen)
        dc.SetBrush(wx.TRANSPARENT_BRUSH)

        if self.GetCentreResize():
            new_width = 2.0 * abs(x - self.GetX())
            new_height = 2.0 * abs(y - self.GetY())

            # Constrain sizing according to what control point you're dragging
            if pt._type == CONTROL_POINT_HORIZONTAL:
                if self.GetMaintainAspectRatio():
                    new_height = bound_y * (new_width / bound_x)
                else:
                    new_height = bound_y
            elif pt._type == CONTROL_POINT_VERTICAL:
                if self.GetMaintainAspectRatio():
                    new_width = bound_x * (new_height / bound_y)
                else:
                    new_width = bound_x
            elif pt._type == CONTROL_POINT_DIAGONAL and (keys & KEY_SHIFT):
                new_height = bound_y * (new_width / bound_x)

            if self.GetFixedWidth():
                new_width = bound_x

            if self.GetFixedHeight():
                new_height = bound_y

            pt._controlPointDragEndWidth = new_width
            pt._controlPointDragEndHeight = new_height
            self.GetEventHandler().OnDrawOutline(dc, self.GetX(), self.GetY(), new_width, new_height)
        else:
            # Don't maintain the same centre point
            newX1 = min(pt._controlPointDragStartX, x)
            newY1 = min(pt._controlPointDragStartY, y)
            newX2 = max(pt._controlPointDragStartX, x)
            newY2 = max(pt._controlPointDragStartY, y)
            if pt._type == CONTROL_POINT_HORIZONTAL:
                newY1 = pt._controlPointDragStartY
                newY2 = newY1 + pt._controlPointDragStartHeight
            elif pt._type == CONTROL_POINT_VERTICAL:
                newX1 = pt._controlPointDragStartX
                newX2 = newX1 + pt._controlPointDragStartWidth
            elif pt._type == CONTROL_POINT_DIAGONAL and (keys & KEY_SHIFT or self.GetMaintainAspectRatio()):
                newH = (newX2 - newX1) * (float(pt._controlPointDragStartHeight) / pt._controlPointDragStartWidth)
                if pt.GetY() > pt._controlPointDragStartY:
                    newY2 = newY1 + newH
                else:
                    newY1 = newY2 - newH

            newWidth = float(newX2 - newX1)
            newHeight = float(newY2 - newY1)

            if pt._type == CONTROL_POINT_VERTICAL and self.GetMaintainAspectRatio():
                newWidth = bound_x * (newHeight / bound_y)

            if pt._type == CONTROL_POINT_HORIZONTAL and self.GetMaintainAspectRatio():
                newHeight = bound_y * (newWidth / bound_x)

            pt._controlPointDragPosX = newX1 + newWidth / 2.0
            pt._controlPointDragPosY = newY1 + newHeight / 2.0
            if self.GetFixedWidth():
                newWidth = bound_x

            if self.GetFixedHeight():
                newHeight = bound_y

            pt._controlPointDragEndWidth = newWidth
            pt._controlPointDragEndHeight = newHeight
            self.GetEventHandler().OnDrawOutline(dc, pt._controlPointDragPosX, pt._controlPointDragPosY, newWidth, newHeight)
            
    def OnSizingEndDragLeft(self, pt, x, y, keys = 0, attachment = 0):
        dc = wx.ClientDC(self.GetCanvas())
        self.GetCanvas().PrepareDC(dc)

        if self._canvas.HasCapture():
            self._canvas.ReleaseMouse()
        dc.SetLogicalFunction(wx.COPY)
        self.Recompute()
        self.ResetControlPoints()

        self.Erase(dc)

        self.SetSize(pt._controlPointDragEndWidth, pt._controlPointDragEndHeight)

        # The next operation could destroy this control point (it does for
        # label objects, via formatting the text), so save all values we're
        # going to use, or we'll be accessing garbage.

        #return

        if self.GetCentreResize():
            self.Move(dc, self.GetX(), self.GetY())
        else:
            self.Move(dc, pt._controlPointDragPosX, pt._controlPointDragPosY)

        # Recursively redraw links if we have a composite
        if len(self.GetChildren()):
            self.DrawLinks(dc, -1, True)

        width, height = self.GetBoundingBoxMax()
        self.GetEventHandler().OnEndSize(width, height)

        if not self._canvas.GetQuickEditMode() and pt._eraseObject:
            self._canvas.Redraw(dc)


            
class RectangleShape(Shape):
    """
    The wxRectangleShape has rounded or square corners.

    Derived from:
      Shape
    """
    def __init__(self, w = 0.0, h = 0.0):
        Shape.__init__(self)
        self._width = w
        self._height = h
        self._cornerRadius = 0.0
        self.SetDefaultRegionSize()

    def OnDraw(self, dc):
        x1 = self._xpos - self._width / 2.0
        y1 = self._ypos - self._height / 2.0

        if self._shadowMode != SHADOW_NONE:
            if self._shadowBrush:
                dc.SetBrush(self._shadowBrush)
            dc.SetPen(TransparentPen)

            if self._cornerRadius:
                dc.DrawRoundedRectangle(x1 + self._shadowOffsetX, y1 + self._shadowOffsetY, self._width, self._height, self._cornerRadius)
            else:
                dc.DrawRectangle(x1 + self._shadowOffsetX, y1 + self._shadowOffsetY, self._width, self._height)

        if self._pen:
            if self._pen.GetWidth() == 0:
                dc.SetPen(TransparentPen)
            else:
                dc.SetPen(self._pen)
        if self._brush:
            dc.SetBrush(self._brush)

        if self._cornerRadius:
            dc.DrawRoundedRectangle(x1, y1, self._width, self._height, self._cornerRadius)
        else:
            dc.DrawRectangle(x1, y1, self._width, self._height)

    def GetBoundingBoxMin(self):
        return self._width, self._height

    def SetSize(self, x, y, recursive = False):
        self.SetAttachmentSize(x, y)
        self._width = max(x, 1)
        self._height = max(y, 1)
        self.SetDefaultRegionSize()

    def GetCornerRadius(self):
        """Get the radius of the rectangle's rounded corners."""
        return self._cornerRadius
    
    def SetCornerRadius(self, rad):
        """Set the radius of the rectangle's rounded corners.

        If the radius is zero, a non-rounded rectangle will be drawn.
        If the radius is negative, the value is the proportion of the smaller
        dimension of the rectangle.
        """
        self._cornerRadius = rad

    # Assume (x1, y1) is centre of box (most generally, line end at box)
    def GetPerimeterPoint(self, x1, y1, x2, y2):
        bound_x, bound_y = self.GetBoundingBoxMax()
        return FindEndForBox(bound_x, bound_y, self._xpos, self._ypos, x2, y2)

    def GetWidth(self):
        return self._width

    def GetHeight(self):
        return self._height

    def SetWidth(self, w):
        self._width = w

    def SetHeight(self, h):
        self._height = h


        
class PolygonShape(Shape):
    """A PolygonShape's shape is defined by a number of points passed to
    the object's constructor. It can be used to create new shapes such as
    diamonds and triangles.
    """
    def __init__(self):
        Shape.__init__(self)
        
        self._points = None
        self._originalPoints = None

    def Create(self, the_points = None):
        """Takes a list of wx.RealPoints or tuples; each point is an offset
        from the centre.
        """
        self.ClearPoints()

        if not the_points:
            self._originalPoints = []
            self._points = []
        else:
            self._originalPoints = the_points

            # Duplicate the list of points
            self._points = []
            for point in the_points:
                new_point = wx.Point(point[0], point[1])
                self._points.append(new_point)
            self.CalculateBoundingBox()
            self._originalWidth = self._boundWidth
            self._originalHeight = self._boundHeight
            self.SetDefaultRegionSize()

    def ClearPoints(self):
        self._points = []
        self._originalPoints = []

    # Width and height. Centre of object is centre of box
    def GetBoundingBoxMin(self):
        return self._boundWidth, self._boundHeight

    def GetPoints(self):
        """Return the internal list of polygon vertices."""
        return self._points

    def GetOriginalPoints(self):
        return self._originalPoints

    def GetOriginalWidth(self):
        return self._originalWidth

    def GetOriginalHeight(self):
        return self._originalHeight

    def SetOriginalWidth(self, w):
        self._originalWidth = w

    def SetOriginalHeight(self, h):
        self._originalHeight = h
        
    def CalculateBoundingBox(self):
        # Calculate bounding box at construction (and presumably resize) time
        left = 10000
        right = -10000
        top = 10000
        bottom = -10000

        for point in self._points:
            if point[0] < left:
                left = point[0]
            if point[0] > right:
                right = point[0]

            if point[1] < top:
                top = point[1]
            if point[1] > bottom:
                bottom = point[1]

        self._boundWidth = right - left
        self._boundHeight = bottom - top

    def CalculatePolygonCentre(self):
        """Recalculates the centre of the polygon, and
        readjusts the point offsets accordingly.
        Necessary since the centre of the polygon
        is expected to be the real centre of the bounding
        box.
        """
        left = 10000
        right = -10000
        top = 10000
        bottom = -10000

        for point in self._points:
            if point[0] < left:
                left = point[0]
            if point[0] > right:
                right = point[0]

            if point[1] < top:
                top = point[1]
            if point[1] > bottom:
                bottom = point[1]

        bwidth = right - left
        bheight = bottom - top

        newCentreX = left + bwidth / 2.0
        newCentreY = top + bheight / 2.0

        for i in range(len(self._points)):
            self._points[i] = self._points[i][0] - newCentreX, self._points[i][1] - newCentreY
        self._xpos += newCentreX
        self._ypos += newCentreY

    def HitTest(self, x, y):
        # Imagine four lines radiating from this point. If all of these lines
        # hit the polygon, we're inside it, otherwise we're not. Obviously
        # we'd need more radiating lines to be sure of correct results for
        # very strange (concave) shapes.
        endPointsX = [x, x + 1000, x, x - 1000]
        endPointsY = [y - 1000, y, y + 1000, y]

        xpoints = []
        ypoints = []

        for point in self._points:
            xpoints.append(point[0] + self._xpos)
            ypoints.append(point[1] + self._ypos)

        # We assume it's inside the polygon UNLESS one or more
        # lines don't hit the outline.
        isContained = True

        for i in range(4):
            if not PolylineHitTest(xpoints, ypoints, x, y, endPointsX[i], endPointsY[i]):
                isContained = False

        if not isContained:
            return False

        nearest_attachment = 0

        # If a hit, check the attachment points within the object
        nearest = 999999

        for i in range(self.GetNumberOfAttachments()):
            e = self.GetAttachmentPositionEdge(i)
            if e:
                xp, yp = e
                l = math.sqrt((xp - x) * (xp - x) + (yp - y) * (yp - y))
                if l < nearest:
                    nearest = l
                    nearest_attachment = i

        return nearest_attachment, nearest

    # Really need to be able to reset the shape! Otherwise, if the
    # points ever go to zero, we've lost it, and can't resize.
    def SetSize(self, new_width, new_height, recursive = True):
        self.SetAttachmentSize(new_width, new_height)

        # Multiply all points by proportion of new size to old size
        x_proportion = abs(float(new_width) / self._originalWidth)
        y_proportion = abs(float(new_height) / self._originalHeight)

        for i in range(max(len(self._points), len(self._originalPoints))):
            self._points[i] = wx.Point(self._originalPoints[i][0] * x_proportion, self._originalPoints[i][1] * y_proportion)

        self._boundWidth = abs(new_width)
        self._boundHeight = abs(new_height)
        self.SetDefaultRegionSize()

    # Make the original points the same as the working points
    def UpdateOriginalPoints(self):
        """If we've changed the shape, must make the original points match the
        working points with this function.
        """
        self._originalPoints = []

        for point in self._points:
            original_point = wx.RealPoint(point[0], point[1])
            self._originalPoints.append(original_point)

        self.CalculateBoundingBox()
        self._originalWidth = self._boundWidth
        self._originalHeight = self._boundHeight

    def AddPolygonPoint(self, pos):
        """Add a control point after the given point."""
        try:
            firstPoint = self._points[pos]
        except ValueError:
            firstPoint = self._points[0]

        try:
            secondPoint = self._points[pos + 1]
        except ValueError:
            secondPoint = self._points[0]

        x = (secondPoint[0] - firstPoint[0]) / 2.0 + firstPoint[0]
        y = (secondPoint[1] - firstPoint[1]) / 2.0 + firstPoint[1]
        point = wx.RealPoint(x, y)

        if pos >= len(self._points) - 1:
            self._points.append(point)
        else:
            self._points.insert(pos + 1, point)

        self.UpdateOriginalPoints()

        if self._selected:
            self.DeleteControlPoints()
            self.MakeControlPoints()

    def DeletePolygonPoint(self, pos):
        """Delete the given control point."""
        if pos < len(self._points):
            del self._points[pos]
            self.UpdateOriginalPoints()
            if self._selected:
                self.DeleteControlPoints()
                self.MakeControlPoints()

    # Assume (x1, y1) is centre of box (most generally, line end at box)
    def GetPerimeterPoint(self, x1, y1, x2, y2):
        # First check for situation where the line is vertical,
        # and we would want to connect to a point on that vertical --
        # oglFindEndForPolyline can't cope with this (the arrow
        # gets drawn to the wrong place).
        if self._attachmentMode == ATTACHMENT_MODE_NONE and x1 == x2:
            # Look for the point we'd be connecting to. This is
            # a heuristic...
            for point in self._points:
                if point[0] == 0:
                    if y2 > y1 and point[1] > 0:
                        return point[0] + self._xpos, point[1] + self._ypos
                    elif y2 < y1 and point[1] < 0:
                        return point[0] + self._xpos, point[1] + self._ypos

        xpoints = []
        ypoints = []
        for point in self._points:
            xpoints.append(point[0] + self._xpos)
            ypoints.append(point[1] + self._ypos)

        return FindEndForPolyline(xpoints, ypoints, x1, y1, x2, y2)

    def OnDraw(self, dc):
        if self._shadowMode != SHADOW_NONE:
            if self._shadowBrush:
                dc.SetBrush(self._shadowBrush)
            dc.SetPen(TransparentPen)

            dc.DrawPolygon(self._points, self._xpos + self._shadowOffsetX, self._ypos, self._shadowOffsetY)

        if self._pen:
            if self._pen.GetWidth() == 0:
                dc.SetPen(TransparentPen)
            else:
                dc.SetPen(self._pen)
        if self._brush:
            dc.SetBrush(self._brush)
        dc.DrawPolygon(self._points, self._xpos, self._ypos)

    def OnDrawOutline(self, dc, x, y, w, h):
        dc.SetBrush(wx.TRANSPARENT_BRUSH)
        # Multiply all points by proportion of new size to old size
        x_proportion = abs(float(w) / self._originalWidth)
        y_proportion = abs(float(h) / self._originalHeight)

        intPoints = []
        for point in self._originalPoints:
            intPoints.append(wx.Point(x_proportion * point[0], y_proportion * point[1]))
        dc.DrawPolygon(intPoints, x, y)

    # Make as many control points as there are vertices
    def MakeControlPoints(self):
        for point in self._points:
            control = PolygonControlPoint(self._canvas, self, CONTROL_POINT_SIZE, point, point[0], point[1])
            self._canvas.AddShape(control)
            self._controlPoints.append(control)

    def ResetControlPoints(self):
        for i in range(min(len(self._points), len(self._controlPoints))):
            point = self._points[i]
            self._controlPoints[i]._xoffset = point[0]
            self._controlPoints[i]._yoffset = point[1]
            self._controlPoints[i].polygonVertex = point

    def GetNumberOfAttachments(self):
        maxN = max(len(self._points) - 1, 0)
        for point in self._attachmentPoints:
            if point._id > maxN:
                maxN = point._id
        return maxN + 1

    def GetAttachmentPosition(self, attachment, nth = 0, no_arcs = 1, line = None):
        if self._attachmentMode == ATTACHMENT_MODE_EDGE and self._points and attachment < len(self._points):
            point = self._points[0]
            return point[0] + self._xpos, point[1] + self._ypos
        return Shape.GetAttachmentPosition(self, attachment, nth, no_arcs, line)

    def AttachmentIsValid(self, attachment):
        if not self._points:
            return False

        if attachment >= 0 and attachment < len(self._points):
            return True

        for point in self._attachmentPoints:
            if point._id == attachment:
                return True

        return False

    # Rotate about the given axis by the given amount in radians
    def Rotate(self, x, y, theta):
        actualTheta = theta - self._rotation

        # Rotate attachment points
        sinTheta = math.sin(actualTheta)
        cosTheta = math.cos(actualTheta)

        for point in self._attachmentPoints:
            x1 = point._x
            y1 = point._y

            point._x = x1 * cosTheta - y1 * sinTheta + x * (1 - cosTheta) + y * sinTheta
            point._y = x1 * sinTheta + y1 * cosTheta + y * (1 - cosTheta) + x * sinTheta

        for i in range(len(self._points)):
            x1, y1 = self._points[i]

            self._points[i] = x1 * cosTheta - y1 * sinTheta + x * (1 - cosTheta) + y * sinTheta, x1 * sinTheta + y1 * cosTheta + y * (1 - cosTheta) + x * sinTheta

        for i in range(len(self._originalPoints)):
            x1, y1 = self._originalPoints[i]

            self._originalPoints[i] = x1 * cosTheta - y1 * sinTheta + x * (1 - cosTheta) + y * sinTheta, x1 * sinTheta + y1 * cosTheta + y * (1 - cosTheta) + x * sinTheta

        # Added by Pierre Hjälm. If we don't do this the outline will be
        # the wrong size. Hopefully it won't have any ill effects.
        self.UpdateOriginalPoints()
        
        self._rotation = theta

        self.CalculatePolygonCentre()
        self.CalculateBoundingBox()
        self.ResetControlPoints()

    # Control points ('handles') redirect control to the actual shape, to
    # make it easier to override sizing behaviour.
    def OnSizingDragLeft(self, pt, draw, x, y, keys = 0, attachment = 0):
        dc = wx.ClientDC(self.GetCanvas())
        self.GetCanvas().PrepareDC(dc)

        dc.SetLogicalFunction(OGLRBLF)

        dottedPen = wx.Pen(wx.Colour(0, 0, 0), 1, wx.DOT)
        dc.SetPen(dottedPen)
        dc.SetBrush(wx.TRANSPARENT_BRUSH)

        # Code for CTRL-drag in C++ version commented out
        
        pt.CalculateNewSize(x, y)

        self.GetEventHandler().OnDrawOutline(dc, self.GetX(), self.GetY(), pt.GetNewSize()[0], pt.GetNewSize()[1])

    def OnSizingBeginDragLeft(self, pt, x, y, keys = 0, attachment = 0):
        dc = wx.ClientDC(self.GetCanvas())
        self.GetCanvas().PrepareDC(dc)

        self.Erase(dc)
        
        dc.SetLogicalFunction(OGLRBLF)

        bound_x, bound_y = self.GetBoundingBoxMin()

        dist = math.sqrt((x - self.GetX()) * (x - self.GetX()) + (y - self.GetY()) * (y - self.GetY()))

        pt._originalDistance = dist
        pt._originalSize[0] = bound_x
        pt._originalSize[1] = bound_y

        if pt._originalDistance == 0:
            pt._originalDistance = 0.0001

        dottedPen = wx.Pen(wx.Colour(0, 0, 0), 1, wx.DOT)
        dc.SetPen(dottedPen)
        dc.SetBrush(wx.TRANSPARENT_BRUSH)

        # Code for CTRL-drag in C++ version commented out

        pt.CalculateNewSize(x, y)

        self.GetEventHandler().OnDrawOutline(dc, self.GetX(), self.GetY(), pt.GetNewSize()[0], pt.GetNewSize()[1])

        self._canvas.CaptureMouse()

    def OnSizingEndDragLeft(self, pt, x, y, keys = 0, attachment = 0):
        dc = wx.ClientDC(self.GetCanvas())
        self.GetCanvas().PrepareDC(dc)

        if self._canvas.HasCapture():
            self._canvas.ReleaseMouse()
        dc.SetLogicalFunction(wx.COPY)

        # If we're changing shape, must reset the original points
        if keys & KEY_CTRL:
            self.CalculateBoundingBox()
            self.CalculatePolygonCentre()
        else:
            self.SetSize(pt.GetNewSize()[0], pt.GetNewSize()[1])

        self.Recompute()
        self.ResetControlPoints()
        self.Move(dc, self.GetX(), self.GetY())
        if not self._canvas.GetQuickEditMode():
            self._canvas.Redraw(dc)



class EllipseShape(Shape):
    """The EllipseShape behaves similarly to the RectangleShape but is
    elliptical.

    Derived from:
      wxShape
    """
    def __init__(self, w, h):
        Shape.__init__(self)
        self._width = w
        self._height = h
        self.SetDefaultRegionSize()

    def GetBoundingBoxMin(self):
        return self._width, self._height

    def GetPerimeterPoint(self, x1, y1, x2, y2):
        bound_x, bound_y = self.GetBoundingBoxMax()

        return DrawArcToEllipse(self._xpos, self._ypos, bound_x, bound_y, x2, y2, x1, y1)

    def GetWidth(self):
        return self._width

    def GetHeight(self):
        return self._height

    def SetWidth(self, w):
        self._width = w

    def SetHeight(self, h):
        self._height = h
        
    def OnDraw(self, dc):
        if self._shadowMode != SHADOW_NONE:
            if self._shadowBrush:
                dc.SetBrush(self._shadowBrush)
            dc.SetPen(TransparentPen)
            dc.DrawEllipse(self._xpos - self.GetWidth() / 2.0 + self._shadowOffsetX,
                           self._ypos - self.GetHeight() / 2.0 + self._shadowOffsetY,
                           self.GetWidth(), self.GetHeight())

        if self._pen:
            if self._pen.GetWidth() == 0:
                dc.SetPen(TransparentPen)
            else:
                dc.SetPen(self._pen)
        if self._brush:
            dc.SetBrush(self._brush)
        dc.DrawEllipse(self._xpos - self.GetWidth() / 2.0, self._ypos - self.GetHeight() / 2.0, self.GetWidth(), self.GetHeight())

    def SetSize(self, x, y, recursive = True):
        self.SetAttachmentSize(x, y)
        self._width = x
        self._height = y
        self.SetDefaultRegionSize()

    def GetNumberOfAttachments(self):
        return Shape.GetNumberOfAttachments(self)

    # There are 4 attachment points on an ellipse - 0 = top, 1 = right,
    # 2 = bottom, 3 = left.
    def GetAttachmentPosition(self, attachment, nth = 0, no_arcs = 1, line = None):
        if self._attachmentMode == ATTACHMENT_MODE_BRANCHING:
            return Shape.GetAttachmentPosition(self, attachment, nth, no_arcs, line)

        if self._attachmentMode != ATTACHMENT_MODE_NONE:
            top = self._ypos + self._height / 2.0
            bottom = self._ypos - self._height / 2.0
            left = self._xpos - self._width / 2.0
            right = self._xpos + self._width / 2.0

            physicalAttachment = self.LogicalToPhysicalAttachment(attachment)

            if physicalAttachment == 0:
                if self._spaceAttachments:
                    x = left + (nth + 1) * self._width / (no_arcs + 1.0)
                else:
                    x = self._xpos
                y = top
                # We now have the point on the bounding box: but get the point
                # on the ellipse by imagining a vertical line from
                # (x, self._ypos - self._height - 500) to (x, self._ypos) intersecting
                # the ellipse.

                return DrawArcToEllipse(self._xpos, self._ypos, self._width, self._height, x, self._ypos - self._height - 500, x, self._ypos)
            elif physicalAttachment == 1:
                x = right
                if self._spaceAttachments:
                    y = bottom + (nth + 1) * self._height / (no_arcs + 1.0)
                else:
                    y = self._ypos
                return DrawArcToEllipse(self._xpos, self._ypos, self._width, self._height, self._xpos + self._width + 500, y, self._xpos, y)
            elif physicalAttachment == 2:
                if self._spaceAttachments:
                    x = left + (nth + 1) * self._width / (no_arcs + 1.0)
                else:
                    x = self._xpos
                y = bottom
                return DrawArcToEllipse(self._xpos, self._ypos, self._width, self._height, x, self._ypos + self._height + 500, x, self._ypos)
            elif physicalAttachment == 3:
                x = left
                if self._spaceAttachments:
                    y = bottom + (nth + 1) * self._height / (no_arcs + 1.0)
                else:
                    y = self._ypos
                return DrawArcToEllipse(self._xpos, self._ypos, self._width, self._height, self._xpos - self._width - 500, y, self._xpos, y)
            else:
                return Shape.GetAttachmentPosition(self, attachment, x, y, nth, no_arcs, line)
        else:
            return self._xpos, self._ypos



class CircleShape(EllipseShape):
    """An EllipseShape whose width and height are the same."""
    def __init__(self, diameter):
        EllipseShape.__init__(self, diameter, diameter)
        self.SetMaintainAspectRatio(True)

    def GetPerimeterPoint(self, x1, y1, x2, y2):
        return FindEndForCircle(self._width / 2.0, self._xpos, self._ypos, x2, y2)



class TextShape(RectangleShape):
    """As wxRectangleShape, but only the text is displayed."""
    def __init__(self, width, height):
        RectangleShape.__init__(self, width, height)

    def OnDraw(self, dc):
        pass



class ShapeRegion(object):
    """Object region."""
    def __init__(self, region = None):
        if region:
            self._regionText = region._regionText
            self._regionName = region._regionName
            self._textColour = region._textColour

            self._font = region._font
            self._minHeight = region._minHeight
            self._minWidth = region._minWidth
            self._width = region._width
            self._height = region._height
            self._x = region._x
            self._y = region._y

            self._regionProportionX = region._regionProportionX
            self._regionProportionY = region._regionProportionY
            self._formatMode = region._formatMode
            self._actualColourObject = region._actualColourObject
            self._actualPenObject = None
            self._penStyle = region._penStyle
            self._penColour = region._penColour

            self.ClearText()
            for line in region._formattedText:
                new_line = ShapeTextLine(line.GetX(), line.GetY(), line.GetText())
                self._formattedText.append(new_line)
        else:
            self._regionText = ""
            self._font = NormalFont
            self._minHeight = 5.0
            self._minWidth = 5.0
            self._width = 0.0
            self._height = 0.0
            self._x = 0.0
            self._y = 0.0

            self._regionProportionX = -1.0
            self._regionProportionY = -1.0
            self._formatMode = FORMAT_CENTRE_HORIZ | FORMAT_CENTRE_VERT
            self._regionName = ""
            self._textColour = "BLACK"
            self._penColour = "BLACK"
            self._penStyle = wx.SOLID
            self._actualColourObject = wx.TheColourDatabase.Find("BLACK")
            self._actualPenObject = None

            self._formattedText = []

    def ClearText(self):
        self._formattedText = []

    def SetFont(self, f):
        self._font = f

    def SetMinSize(self, w, h):
        self._minWidth = w
        self._minHeight = h

    def SetSize(self, w, h):
        self._width = w
        self._height = h

    def SetPosition(self, xp, yp):
        self._x = xp
        self._y = yp

    def SetProportions(self, xp, yp):
        self._regionProportionX = xp
        self._regionProportionY = yp

    def SetFormatMode(self, mode):
        self._formatMode = mode

    def SetColour(self, col):
        self._textColour = col
        self._actualColourObject = col

    def GetActualColourObject(self):
        self._actualColourObject = wx.TheColourDatabase.Find(self.GetColour())
        return self._actualColourObject

    def SetPenColour(self, col):
        self._penColour = col
        self._actualPenObject = None

    # Returns NULL if the pen is invisible
    # (different to pen being transparent; indicates that
    # region boundary should not be drawn.)
    def GetActualPen(self):
        if self._actualPenObject:
            return self._actualPenObject

        if not self._penColour:
            return None
        if self._penColour=="Invisible":
            return None
        self._actualPenObject = wx.Pen(self._penColour, 1, self._penStyle)
        return self._actualPenObject

    def SetText(self, s):
        self._regionText = s

    def SetName(self, s):
        self._regionName = s

    def GetText(self):
        return self._regionText

    def GetFont(self):
        return self._font

    def GetMinSize(self):
        return self._minWidth, self._minHeight

    def GetProportion(self):
        return self._regionProportionX, self._regionProportionY

    def GetSize(self):
        return self._width, self._height

    def GetPosition(self):
        return self._x, self._y

    def GetFormatMode(self):
        return self._formatMode

    def GetName(self):
        return self._regionName

    def GetColour(self):
        return self._textColour

    def GetFormattedText(self):
        return self._formattedText

    def GetPenColour(self):
        return self._penColour

    def GetPenStyle(self):
        return self._penStyle

    def SetPenStyle(self, style):
        self._penStyle = style
        self._actualPenObject = None

    def GetWidth(self):
        return self._width

    def GetHeight(self):
        return self._height



class ControlPoint(RectangleShape):
    def __init__(self, theCanvas, object, size, the_xoffset, the_yoffset, the_type):
        RectangleShape.__init__(self, size, size)

        self._canvas = theCanvas
        self._shape = object
        self._xoffset = the_xoffset
        self._yoffset = the_yoffset
        self._type = the_type
        self.SetPen(BlackForegroundPen)
        self.SetBrush(wx.BLACK_BRUSH)
        self._oldCursor = None
        self._visible = True
        self._eraseObject = True
        
    # Don't even attempt to draw any text - waste of time
    def OnDrawContents(self, dc):
        pass

    def OnDraw(self, dc):
        self._xpos = self._shape.GetX() + self._xoffset
        self._ypos = self._shape.GetY() + self._yoffset
        RectangleShape.OnDraw(self, dc)

    def OnErase(self, dc):
        RectangleShape.OnErase(self, dc)

    # Implement resizing of canvas object
    def OnDragLeft(self, draw, x, y, keys = 0, attachment = 0):
        self._shape.GetEventHandler().OnSizingDragLeft(self, draw, x, y, keys, attachment)

    def OnBeginDragLeft(self, x, y, keys = 0, attachment = 0):
        self._shape.GetEventHandler().OnSizingBeginDragLeft(self, x, y, keys, attachment)

    def OnEndDragLeft(self, x, y, keys = 0, attachment = 0):
        self._shape.GetEventHandler().OnSizingEndDragLeft(self, x, y, keys, attachment)

    def GetNumberOfAttachments(self):
        return 1

    def GetAttachmentPosition(self, attachment, nth = 0, no_arcs = 1, line = None):
        return self._xpos, self._ypos

    def SetEraseObject(self, er):
        self._eraseObject = er

        
class PolygonControlPoint(ControlPoint):
    def __init__(self, theCanvas, object, size, vertex, the_xoffset, the_yoffset):
        ControlPoint.__init__(self, theCanvas, object, size, the_xoffset, the_yoffset, 0)
        self._polygonVertex = vertex
        self._originalDistance = 0.0
        self._newSize = wx.RealPoint()
        self._originalSize = wx.RealPoint()

    def GetNewSize(self):
        return self._newSize
    
    # Calculate what new size would be, at end of resize
    def CalculateNewSize(self, x, y):
        bound_x, bound_y = self.GetShape().GetBoundingBoxMax()
        dist = math.sqrt((x - self._shape.GetX()) * (x - self._shape.GetX()) + (y - self._shape.GetY()) * (y - self._shape.GetY()))

        self._newSize[0] = dist / self._originalDistance * self._originalSize[0]
        self._newSize[1] = dist / self._originalDistance * self._originalSize[1]

    # Implement resizing polygon or moving the vertex
    def OnDragLeft(self, draw, x, y, keys = 0, attachment = 0):
        self._shape.GetEventHandler().OnSizingDragLeft(self, draw, x, y, keys, attachment)

    def OnBeginDragLeft(self, x, y, keys = 0, attachment = 0):
        self._shape.GetEventHandler().OnSizingBeginDragLeft(self, x, y, keys, attachment)

    def OnEndDragLeft(self, x, y, keys = 0, attachment = 0):
        self._shape.GetEventHandler().OnSizingEndDragLeft(self, x, y, keys, attachment)

from _canvas import *
from _lines import *
from _composit import *