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
|
(*
Filling and clipping polygons.
Copyright (C) 2008, 2010 Hezekiah M. Carty
This file is part of PLplot.
PLplot is free software; you can redistribute it and/or modify
it under the terms of the GNU Library General Public License as published
by the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
PLplot is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU Library General Public License for more details.
You should have received a copy of the GNU Library General Public License
along with PLplot; if not, write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
This example will only really be interesting when used with devices that
support or alpha (or transparency) values, such as the cairo device family.
*)
open Plplot
(*--------------------------------------------------------------------------*\
* Test program for filling polygons and proper clipping
\*--------------------------------------------------------------------------*)
let () =
(* Parse and process command line arguments *)
plparseopts Sys.argv [PL_PARSE_FULL];
(* Initialize plplot *)
plssub 3 3;
plinit ();
let xextreme =
[|
[|-120.0; 120.0|];
[|-120.0; 120.0|];
[|-120.0; 120.0|];
[| -80.0; 80.0|];
[|-220.0; -120.0|];
[| -20.0; 20.0|];
[| -20.0; 20.0|];
[| -80.0; 80.0|];
[| 20.0; 120.0|];
|]
in
let yextreme =
[|
[|-120.0; 120.0|];
[| 20.0; 120.0|];
[| -20.0; 120.0|];
[| -20.0; 120.0|];
[|-120.0; 120.0|];
[|-120.0; 120.0|];
[| -20.0; 20.0|];
[| -80.0; 80.0|];
[|-120.0; 120.0|];
|]
in
for k = 0 to 1 do
for j = 0 to 3 do
let x, y =
match j with
0 ->
(* Polygon 1: a diamond *)
[|0.0; -100.0; 0.0; 100.0|],
[|-100.0; 0.0; 100.0; 0.0|]
| 1 ->
(* Polygon 1: a diamond - reverse direction *)
[|100.0; 0.0; -100.0; 0.0;|],
[|0.0; 100.0; 0.0; -100.0|]
| 2 ->
(* Polygon 2: a square with punctures *)
[|-100.0; -100.0; 80.0; -100.0; -100.0;
-80.0; 0.0; 80.0; 100.0; 100.0|],
[|-100.0; -80.0; 0.0; 80.0; 100.0;
100.0; 80.0; 100.0; 100.0; -100.0|]
| 3 ->
(* Polygon 2: a square with punctures - reversed direction *)
[|100.0; 100.0; 80.0; 0.0; -80.0;
-100.0; -100.0; 80.0; -100.0; -100.0|],
[|-100.0; 100.0; 100.0; 80.0; 100.0;
100.0; 80.0; 0.0; -80.0; -100.0|]
| _ -> raise (Failure "only 4 shapes are available")
in
for i = 0 to 8 do
pladv 0;
plvsta ();
plwind xextreme.(i).(0) xextreme.(i).(1) yextreme.(i).(0) yextreme.(i).(1);
plcol0 2;
plbox "bc" 1.0 0 "bcnv" 10.0 0;
plcol0 1;
plpsty 0;
if k = 0 then (
plfill x y
)
else (
plgradient x y 45.0
);
plcol0 2;
pllsty 1;
plline x y;
done
done
done;
(* Don't forget to call plend() to finish off! *)
plend ();
()
|
