File: cgmap_set.pro

package info (click to toggle)
coyote 2019.01.29-1
  • links: PTS, VCS
  • area: main
  • in suites: bullseye, buster
  • size: 6,316 kB
  • sloc: python: 184; makefile: 14; sh: 13
file content (638 lines) | stat: -rw-r--r-- 25,003 bytes parent folder | download | duplicates (2)
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
; docformat = 'rst'
;
; PURPOSE:
;   Provides a modified MAP_SET command that can work together with other Coyote Graphics
;   commands and be used in resizeable graphics windows.
;
;******************************************************************************************;
;                                                                                          ;
;  Copyright (c) 2011, by Fanning Software Consulting, Inc. All rights reserved.           ;
;                                                                                          ;
;  Redistribution and use in source and binary forms, with or without                      ;
;  modification, are permitted provided that the following conditions are met:             ;
;                                                                                          ;
;      * Redistributions of source code must retain the above copyright                    ;
;        notice, this list of conditions and the following disclaimer.                     ;
;      * Redistributions in binary form must reproduce the above copyright                 ;
;        notice, this list of conditions and the following disclaimer in the               ;
;        documentation and/or other materials provided with the distribution.              ;
;      * Neither the name of Fanning Software Consulting, Inc. nor the names of its        ;
;        contributors may be used to endorse or promote products derived from this         ;
;        software without specific prior written permission.                               ;
;                                                                                          ;
;  THIS SOFTWARE IS PROVIDED BY FANNING SOFTWARE CONSULTING, INC. ''AS IS'' AND ANY        ;
;  EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES    ;
;  OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT     ;
;  SHALL FANNING SOFTWARE CONSULTING, INC. BE LIABLE FOR ANY DIRECT, INDIRECT,             ;
;  INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED    ;
;  TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;         ;
;  LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND             ;
;  ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT              ;
;  (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS           ;
;  SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.                            ;
;******************************************************************************************;
;---------------------------------------------------------------------------
;+
;   Provides a modified MAP_SET command that can work together with other Coyote Graphics
;   commands and be used in resizeable graphics windows. Any keyword appropriate for MAP_SET,
;   MAP_CONTINENTS, or MAP_GRID can be used with this routine. Additional or modified 
;   keywords are documented.
;
; :Categories:
;    Graphics, Map Projections
;    
; :Params:
;     p0lat: in, optional, type=float
;         The center latitude of the map projection.
;     p0lon: in, optional, type=float
;         The center longitude of the map projection.
;     rot: in, optional, type=float, default=0.0
;         The angle through which the map projection should be rotated. Positive
;         values are in a clockwise direction.
;       
; :Keywords:
;     addcmd: in, optional, type=boolean, default=0
;        If this keyword is set, the command is added to the resizeable graphics
;        window, cgWindow. 
;     background: in, optional, type=string, default='white'
;        The name of the background color. Using this keyword automatically sets 
;        the ERASE keyword to 1.
;     color: in, optional, type=string, default='opposite'
;        The name of the drawing color for the program.
;        erase: in, optional, type=boolean, default=0
;        Set this keyword if you wish to the current graphics content of the window
;        before drawing the map projection. The graphics display will be erased
;        in the background color. This is a more intuitive way to set this behavior
;        than to set NOERASE to 0, which does the same thing.
;     continents: in, optional, type=boolean, default=0
;         Set this keyword to display continental outlines on the map projection.
;         Any keyword appropriate to the IDL command Map_Continents can be used to
;         modify the look of the continental outlines.
;     erase: in, optional, type=boolean, default=0
;         A more intuitive way to set NOERASE=0. If ERASE is set, the display window
;         is erased in the BACKGROUND color.
;     grid: in, optional, type=boolean, default=0
;         Set this keyword to display a map grid on the map projection. And keyword
;         appropriate to the IDL command Map_Grid can be used to modify the look of the
;         map grid.
;     onimage: in, optional, type=boolean, default=0
;        If this keyword is set, the position of the map projection in the graphics window
;        is obtained from the last image displayed with cgImage. This makes it extremely
;        easy to display an image and immediately set up a map projection space that will
;        allow you to annotate the image using map locations. This keyword is ignored if
;        the 'Position` keyword is used.
;     position: in, optional, type=FltArr(4)
;        The normalized position of the map projection space in the graphics window.
;        The default is [0.075, 0.075, 0.925, 0.925]
;     window: in, optional, type=boolean, default=0
;         If this keyword is set, the command replaces any commands in a current
;         cgWindow or it opens a new cgWindow and adds itself to it.
;
; :Author:
;   FANNING SOFTWARE CONSULTING::
;      David W. Fanning 
;      1645 Sheely Drive
;      Fort Collins, CO 80526 USA
;      Phone: 970-221-0438
;      E-mail: david@idlcoyote.com
;      Coyote's Guide to IDL Programming: http://www.idlcoyote.com
;           
; :History:
;     Written by David W. Fanning, 7 November 2011.
;     Added ONIMAGE keyword to allow the position to be specified at the last
;        image position from cgImage. 3 March 2012. DWF.
;     Several MAP_CONTINENTS keywords seem to have gone missing. Added COASTS,
;        COUNTRIES, FILL_CONTINENTS, and RIVERS. 4 Dec 2012. DWF.
;     Forgot to pass the "extra" information in (e.g., E_HORIZON keyword) to Map_Set. 18 Jan 2013. DWF.
;     HORIZON keyword not being passed along to Map_Set. 28 Feb 2013. DWF.
;     Forgot to look at !P.Multi before setting a POSITION. Fixed. 11 March 2013. DWF.
;     Modified the E_GRID and E_HORIZON structure code to allow color names. 29 April 2013. Joe Sapp.
;     In some situations, the "extra" continents structure was not being passed along. 29 May 2013. DWF.
;     Now, when "extra" structures are passed along, they can have duplicate fields. Put check in place. 22 June 2013. DWF.
;     Removed parameters E_GRID and E_CONTINENTS in call to MAP_SET so they don't interfere with later calls to cgMap_Grid and cgMap_Continents. 23 Nov 2015. Joe Sapp.
;     Fix typo in passing extra parameters to cgMap_Continents. 23 Nov 2015. Joe Sapp.
;
; :Copyright:
;     Copyright (c) 2011-2012, Fanning Software Consulting, Inc.
;-
;---------------------------------------------------------------------------
PRO cgMap_Set, p0lat, p0lon, rot, $
      ADDCMD=addcmd, $
      ADVANCE = advance,  $
      AITOFF = aitoff, $            
      ALBERS = albers, $            
      AZIMUTHAL = azimuth, $
      BACKGROUND=background, $
      BOX_AXES=box_axes, $
      CENTRAL_AZIMUTH=cent_azim, $
      CHARSIZE = charsize, $
      CLIP=clip, $
      COASTS=coasts, $
      COLOR=color, $
      CON_COLOR=con_color, $
      CONIC = conic, $
      CONTINENTS = continents, $
      COUNTRIES=countries, $
      CYLINDRICAL = cylindrical, $
      E_CONTINENTS=_econt, $ 
      E_HORIZON=_ehorizon, $
      E_GRID=_egrid, $      
      ELLIPSOID = ellips, $
      ERASE=erase, $
      FILL_CONTINENTS=fill_continents, $
      GLINESTYLE=glinestyle, $
      GLINETHICK=glinethick, $
      GRID=grid, $
      GOODESHOMOLOSINE = goodes, $  
      GNOMIC = gnomic, $
      HAMMER = hammer, $            
      HIRES = hires, $
      HORIZON=horizon, $
      ISOTROPIC = iso, $,             
      LAMBERT = lambert, $
      LABEL=label, $
      LATALIGN=latalign, $
      LATDEL=latdel, $
      LATLAB=latlab, $
      LIMIT = limit, $           
      LONALIGN=lonalign, $
      LONDEL=londel, $
      LONLAB=lonlab, $
      MERCATOR = mercator, $
      MILLER_CYLINDRICAL=miller, $
      MLINESTYLE=mlinestyle, $
      MLINETHICK=mlinethick, $
      MOLLWEIDE = mollweide, $
      NAME=name, $                    
      NOBORDER=noborder, $
      NOERASE=noerase, $
      ONIMAGE=onimage, $
      ORTHOGRAPHIC = orthographic, $
      POSITION = position, $
      PROJECTION=proj, $   
      RIVERS=rivers, $           
      REVERSE=reverse, $   
      ROBINSON = robinson, $         
      SAT_P = Sat_p, $ 
      SATELLITE = satellite, $       
      SCALE=scale, $ 
      STANDARD_PARALLELS = std_p, $
      STEREOGRAPHIC = stereographic, $
      SINUSOIDAL = sinusoidal, $
      T3D=t3d, $
      TITLE=title, $
      TRANSVERSE_MERCATOR = utm, $ 
      USA=usa, $
      WHOLE_MAP=whole_map, $
      WINDOW=window, $
      XMARGIN=xmargin, $
      YMARGIN=ymargin, $
      ZVALUE=zvalue
    
    Catch, theError
    IF theError NE 0 THEN BEGIN
      Catch, /CANCEL
      void = cgErrorMsg()
      IF N_Elements(thisState) NE 0 THEN cgSetColorState, thisState
      RETURN
    ENDIF
      
    ; Add this command to a cgWindow.
    IF Keyword_Set(addcmd) THEN BEGIN
    
       cgWindow, 'cgMap_Set', p0lat, p0lon, rot, $
          ADDCMD=1, $
          ADVANCE = advance,  $
          AITOFF = aitoff, $            
          ALBERS = albers, $            
          AZIMUTHAL = azimuth, $
          BACKGROUND=background, $
          BOX_AXES=box_axes, $
          CENTRAL_AZIMUTH=cent_azim, $
          CHARSIZE = charsize, $
          CLIP=clip, $
          COASTS=coasts, $
          COLOR=color, $
          CON_COLOR=con_color, $
          CONIC = conic, $
          CONTINENTS = continents, $
          COUNTRIES=countries, $
          CYLINDRICAL = cylindrical, $
          E_CONTINENTS=_econt, $ 
          E_HORIZON=_ehorizon, $
          E_GRID=_egrid, $      
          ELLIPSOID = ellips, $
          ERASE=erase, $
          FILL_CONTINENTS=fill_continents, $
          GLINESTYLE=glinestyle, $
          GLINETHICK=glinethick, $
          GRID=grid, $
          GOODESHOMOLOSINE = goodes, $  
          GNOMIC = gnomic, $
          HAMMER = hammer, $            
          HIRES = hires, $
          HORIZON=horizon, $
          ISOTROPIC = iso, $,             
          LAMBERT = lambert, $
          LABEL=label, $
          LATALIGN=latalign, $
          LATDEL=latdel, $
          LATLAB=latlab, $
          LIMIT = limit, $           
          LONALIGN=lonalign, $
          LONDEL=londel, $
          LONLAB=lonlab, $
          MERCATOR = mercator, $
          MILLER_CYLINDRICAL=miller, $
          MLINESTYLE=mlinestyle, $
          MLINETHICK=mlinethick, $
          MOLLWEIDE = mollweide, $
          NAME=name, $                    
          NOBORDER=noborder, $
          NOERASE=noerase, $
          ONIMAGE=onimage, $
          ORTHOGRAPHIC = orthographic, $
          POSITION = position, $
          PROJECTION=proj, $    
          RIVERS=rivers, $          
          REVERSE=reverse, $   
          ROBINSON = robinson, $         
          SAT_P = Sat_p, $ 
          SATELLITE = satellite, $       
          SCALE=scale, $ 
          STANDARD_PARALLELS = std_p, $
          STEREOGRAPHIC = stereographic, $
          SINUSOIDAL = sinusoidal, $
          T3D=t3d, $
          TITLE=title, $
          TRANSVERSE_MERCATOR = utm, $ 
          USA=usa, $
          WHOLE_MAP=whole_map, $
          XMARGIN=xmargin, $
          YMARGIN=ymargin, $
          ZVALUE=zvalue
          
       RETURN
       
    ENDIF
    
    ; Replace the commands in or create a cgWindow.
    IF Keyword_Set(window) THEN BEGIN
    
       currentWindow = cgQuery(/CURRENT, COUNT=wincnt)
       IF wincnt EQ 0 THEN BEGIN
           cgWindow
           IF N_Elements(background) EQ 0 THEN background='white'
       ENDIF
       cgWindow, 'cgMap_Set', p0lat, p0lon, rot, $
          ADVANCE = advance,  $
          AITOFF = aitoff, $            
          ALBERS = albers, $            
          AZIMUTHAL = azimuth, $
          BACKGROUND=background, $
          BOX_AXES=box_axes, $
          CENTRAL_AZIMUTH=cent_azim, $
          CHARSIZE = charsize, $
          CLIP=clip, $
          COLOR=color, $
          COASTS=coasts, $
          CON_COLOR=con_color, $
          CONIC = conic, $
          CONTINENTS = continents, $
          COUNTRIES=countries, $
          CYLINDRICAL = cylindrical, $
          E_CONTINENTS=_econt, $ 
          E_HORIZON=_ehorizon, $
          E_GRID=_egrid, $      
          ELLIPSOID = ellips, $
          ERASE=erase, $
          FILL_CONTINENTS=fill_continents, $
          GLINESTYLE=glinestyle, $
          GLINETHICK=glinethick, $
          GRID=grid, $
          GOODESHOMOLOSINE = goodes, $  
          GNOMIC = gnomic, $
          HAMMER = hammer, $            
          HIRES = hires, $
          HORIZON=horizon, $
          ISOTROPIC = iso, $,             
          LAMBERT = lambert, $
          LABEL=label, $
          LATALIGN=latalign, $
          LATDEL=latdel, $
          LATLAB=latlab, $
          LIMIT = limit, $           
          LONALIGN=lonalign, $
          LONDEL=londel, $
          LONLAB=lonlab, $
          MERCATOR = mercator, $
          MILLER_CYLINDRICAL=miller, $
          MLINESTYLE=mlinestyle, $
          MLINETHICK=mlinethick, $
          MOLLWEIDE = mollweide, $
          NAME=name, $                    
          NOBORDER=noborder, $
          NOERASE=noerase, $
          ONIMAGE=onimage, $
          ORTHOGRAPHIC = orthographic, $
          POSITION = position, $
          PROJECTION=proj, $  
          RIVERS=rivers, $            
          REVERSE=reverse, $   
          ROBINSON = robinson, $         
          SAT_P = Sat_p, $ 
          SATELLITE = satellite, $       
          SCALE=scale, $ 
          STANDARD_PARALLELS = std_p, $
          STEREOGRAPHIC = stereographic, $
          SINUSOIDAL = sinusoidal, $
          T3D=t3d, $
          TITLE=title, $
          TRANSVERSE_MERCATOR = utm, $ 
          USA=usa, $
          WHOLE_MAP=whole_map, $
          XMARGIN=xmargin, $
          YMARGIN=ymargin, $
          ZVALUE=zvalue, $
          REPLACECMD=1
          
       RETURN
       
    ENDIF
    
    ; Erasing to get the background color right is going to be very important.
    ; Unfortunately, MAP_SET itself has an ERASE command in it that will result
    ; in a window with a BLACK background. We don't want this, so we have to call
    ; MAP_SET, when we do, with the NOERASE keyword set. We need a flag that 
    ; tells us when we want to do the erasing ourselves. Here we initialize the flag.
    eraseForBackground = 0
    
    ; If you specify a BACKGROUND keyword, then ERASE is set automatically.
    IF N_Elements(background) NE 0 THEN BEGIN
        CASE Size(background, /TNAME) OF
           'STRING':
           'LONG': 
           'BYTE': background = StrTrim(Fix(background), 2)
           ELSE: background = StrTrim(background,2)
        ENDCASE 
       IF N_Elements(noerase) EQ 0 THEN BEGIN
          noerase = 1
          eraseForBackground = 1
       ENDIF ELSE eraseForBackground = 0
    ENDIF ELSE background = 'white'
    
    IF N_Elements(color) NE 0 THEN BEGIN
        CASE Size(color, /TNAME) OF
           'STRING':
           'LONG': 
           'BYTE': color = StrTrim(Fix(color), 2)
           ELSE: color = StrTrim(color,2)
        ENDCASE 
    ENDIF ELSE color = "opposite"
    IF N_Elements(con_color) NE 0 THEN BEGIN
        CASE Size(con_color, /TNAME) OF
           'STRING':
           'LONG': 
           'BYTE': con_color = StrTrim(Fix(con_color), 2)
           ELSE: con_color = StrTrim(con_color,2)
        ENDCASE
    ENDIF ELSE BEGIN
       IF Keyword_Set(continents) THEN BEGIN
          IF (N_Elements(_econt) NE 0) THEN BEGIN
             tagnames = Tag_Names(_econt)
             index = Where(tagnames EQ 'COLOR')
             IF index LT 0 THEN BEGIN
                econt = _econt
                con_color = color
             ENDIF $
             ELSE BEGIN
                ; Create a copy of _econt to be passed on with an
                ; appropriate color.
                IF index EQ 0 then econt = {COLOR: 0L} $
                ELSE econt = Create_Struct(tagnames[0], _econt.(0))

                FOR j=1L,N_Elements(tagnames)-1 DO BEGIN
                   value = (j NE index) ? _econt.(j) : 0L
                   econt = Create_Struct(econt, $
                      tagnames[j], value)
                ENDFOR
                econt.color = cgColor(_econt.color)
             ENDELSE
          ENDIF ELSE con_color = color
       ENDIF 
    ENDELSE
    
    ; Make sure the extra continent structure is passed on.
    IF (N_Elements(_econt) NE 0) && (N_Elements(econt) EQ 0) THEN econt = _econt

    ; Fix color passed on to MAP_GRID, if needed.
    IF N_Elements(_egrid) NE 0 THEN BEGIN
       tagnames = Tag_Names(_egrid)
       index = Where(Tag_Names(_egrid) EQ 'COLOR')
       IF index LT 0 THEN egrid = _egrid $
       ELSE BEGIN
          ; Create a copy of _egrid to be passed on with an
          ; appropriate color.
          IF index EQ 0 then egrid = {COLOR: 0L} $
          ELSE egrid = Create_Struct(tagnames[0], _egrid.(0))

          FOR j=1L,N_Elements(tagnames)-1 DO BEGIN
             value = (j NE index) ? _egrid.(j) : 0L
             egrid = Create_Struct(egrid, $
                tagnames[j], value)
          ENDFOR
          egrid.color = cgColor(_egrid.color)
       ENDELSE
    ENDIF

    ; Fix color passed on to the HORIZON keyword, if needed.
    IF N_Elements(_ehorizon) NE 0 THEN BEGIN
       tagnames = Tag_Names(_ehorizon)
       index = Where(Tag_Names(_ehorizon) EQ 'COLOR')
       IF index LT 0 THEN ehorizon = _ehorizon $
       ELSE BEGIN
          ; Create a copy of _ehorizon to be passed on with an
          ; appropriate color.
          IF index EQ 0 then ehorizon = {COLOR: 0L} $
          ELSE ehorizon = Create_Struct(tagnames[0], _ehorizon.(0))

          FOR j=1L,N_Elements(tagnames)-1 DO BEGIN
             value = (j NE index) ? _ehorizon.(j) : 0L
             ehorizon = Create_Struct(ehorizon, $
                tagnames[j], value)
          ENDFOR
          ehorizon.color = cgColor(_ehorizon.color)
       ENDELSE
    ENDIF

    IF N_Elements(position) EQ 0 THEN BEGIN
    
        ; Are you putting this on an image? If so, get the position from
        ; the last image position in.
        IF Keyword_Set(onimage) THEN BEGIN
            COMMON FSC_$CGIMAGE, _cgimage_xsize, _cgimage_ysize, $
                                 _cgimage_winxsize, _cgimage_winysize, $
                                 _cgimage_position, _cgimage_winID, $
                                 _cgimage_current
            position = _cgimage_position
        ENDIF ELSE BEGIN
            IF Total(!P.Multi) LT 0 THEN position = [0.075, 0.075, 0.925, 0.925]
        ENDELSE
    ENDIF
    
    ; Try to do this in decomposed color, if possible.
    cgSetColorState, 1, Current=thisState
    
    ; If this is a graphics device, and there is no current graphics window,
    ; then set the erase flag.
    IF (!D.Name EQ 'WIN' || !D.Name EQ 'X') && (!D.Window LT 0) THEN BEGIN
        IF N_Elements(noerase) EQ 0 THEN BEGIN
            noerase = 1
            eraseForBackground = 1 
        ENDIF 
    ENDIF
    
    ; Need to erase? If you are using this keyword, then I assume
    ; you want the background color to show.
    IF N_Elements(erase) NE 0 THEN BEGIN
         noerase = 1 - Keyword_Set(erase)
         IF Keyword_Set(erase) THEN eraseForBackground = 1
    ENDIF
    
    ; We need the following two lines to avoid problems in MAP_SET with
    ; an ERASE command. We are going to do MAP_SET's erasing for it, then
    ; set the NOERASE=1 keyword on the MAP_SET call further down in the code.
    IF (!P.Multi[0] EQ 0) && Keyword_Set(advance) && ~eraseForBackground THEN eraseForBackground = 1
    IF (~Keyword_Set(noerase)) && (~Keyword_Set(advance)) && ~eraseForBackground THEN eraseForBackground = 1
    
    ; Erase with a background color?
    IF eraseForBackground THEN BEGIN
        cgErase, Color=background
        noerase = 1
    ENDIF
    
    ; Change color into appropriate value, if needed.
    IF Size(color, /TNAME) EQ 'STRING' THEN color = cgColor(color)
    
    ; Input parameters must be defined because of the way MAP_SET is written.
    IF N_Elements(rot) EQ 0 THEN rot = 0.0d0
    IF N_Elements(p0lon) EQ 0 THEN p0lon = 0.0d0
    IF N_Elements(p0lat) EQ 0 THEN p0lat = 0.0d0    
    
    ; Call the MAP_SET procedure.
    Map_Set, p0lat, p0lon, rot, $
        ADVANCE = advance,  $
        AITOFF = aitoff, $            
        ALBERS = albers, $            
        AZIMUTHAL = azimuth, $
        CENTRAL_AZIMUTH=cent_azim, $
        CHARSIZE = charsize, $
        COLOR=color, $
        CONIC = conic, $
        CYLINDRICAL = cylindrical, $
        E_HORIZON=ehorizon, $
        ELLIPSOID = ellips, $
        GOODESHOMOLOSINE = goodes, $  
        GNOMIC = gnomic, $
        HAMMER = hammer, $   
        HORIZON=horizon, $         
        ISOTROPIC = iso, $,             
        LAMBERT = lambert, $
        LIMIT = limit, $           
        MERCATOR = mercator, $
        MILLER_CYLINDRICAL=miller, $
        MOLLWEIDE = mollweide, $
        NAME=name, $                    
        NOBORDER=noborder, $
        NOERASE=1, $
        ORTHOGRAPHIC = orthographic, $
        POSITION = position, $
        PROJECTION=proj, $              
        REVERSE=reverse, $   
        ROBINSON = robinson, $         
        SAT_P = Sat_p, $ 
        SATELLITE = satellite, $       
        SCALE=scale, $ 
        STANDARD_PARALLELS = std_p, $
        STEREOGRAPHIC = stereographic, $
        SINUSOIDAL = sinusoidal, $
        T3D=t3d, $
        TITLE=title, $
        TRANSVERSE_MERCATOR = utm, $ 
        WHOLE_MAP=whole_map, $
        XMARGIN=xmargin, $
        YMARGIN=ymargin, $
        ZVALUE=zvalue
        
    ; Need continental outlines?
    IF Keyword_Set(continents) THEN BEGIN
    
       cgMap_Continents, $
         COASTS=kcoasts, $
         COLOR=con_color, $
         CONTINENTS = continents, $
         COUNTRIES=countries, $
         FILL_CONTINENTS=fill_continents, $
         HIRES=hires, $
         LIMITS = lim_u, $
         MAP_STRUCTURE=mapStructure, $
         ORIENTATION=orientation, $
         RIVERS=rivers, $
         SPACING=spacing, $
         T3D=T3D, $
         THICK=thick, $
         USA = usa, $
         ZVALUE=zvalue, $
         _EXTRA=econt

    ENDIF
    
    ; Need a map grid?
    IF Keyword_Set(grid) THEN BEGIN
    
       ; We have a couple of extra keyword structures that can come in
       ; here. We have to build a structure appropriately, depending upon
       ; what we have.
       CASE 1 OF
          (N_Elements(egrid) EQ 0) && (N_Elements(ehorizon) EQ 0):
          (N_Elements(egrid) EQ 0) && (N_Elements(ehorizon) NE 0): extra = ehorizon
          (N_Elements(egrid) NE 0) && (N_Elements(ehorizon) EQ 0): extra = egrid
          (N_Elements(egrid) NE 0) && (N_Elements(ehorizon) NE 0): BEGIN
              g_tagnames = Tag_Names(egrid)
              h_tagnames = Tag_Names(ehorizon)
              extra = egrid
              
              ; It is possible that these two structures have identical tags, if so
              ; we are going to skip them.
              FOR j=0L,N_Elements(tagnames)-1 DO BEGIN
                 check = Where(tagnames[j] EQ g_tagnames, count)
                 IF count EQ 0 THEN BEGIN
                    extra = Create_Struct(extra, tagnames[j], ehorizon.(j))
                 ENDIF
              ENDFOR
              END        
       ENDCASE
       
       cgMap_Grid, $
          BOX_AXES=box_axes, $
          CHARSIZE=charsize, $
          CLIP_TEXT=clip, $
          HORIZON=horizon, $
          LABEL=label, $
          LATALIGN=latalign, $
          LATDEL=latdel, $
          LATLAB=latlab, $
          LINESTYLE=linestyle, $
          LONALIGN=lonalign, $
          LONDEL=londel, $
          LONLAB=lonlab, $
          ORIENTATION=orientation, $
          THICK=thick, $
          _EXTRA=extra
          
    ENDIF

    ; Restore color state.
    cgSetColorState, thisState
    
    END ;-------------------------------------------------------------------