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comparison test/automated/rect/rect.c @ 3541:0c429a5fda8a

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Added an automated test for rectangle routines, currently only testing line clipping. Use the Cohen-Sutherland algorithm for line clipping which uses integer math and preserves ordering of clipped points. Removed getopt() support in testsdl.c, replaced with simple argv scanning.
author Sam Lantinga <slouken@libsdl.org>
date Fri, 11 Dec 2009 09:22:34 +0000
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3540:3ad09fdbfcb0 3541:0c429a5fda8a
1 /**
2 * Automated SDL rect test.
3 *
4 * Written by Edgar Simo "bobbens"
5 *
6 * Released under Public Domain.
7 */
8
9
10
11
12 #include "SDL_rect.h"
13 #include "../SDL_at.h"
14
15
16 /*
17 * Prototypes.
18 */
19 static void rect_testIntersectRectAndLine (void);
20
21
22 /**
23 * @brief Tests SDL_IntersectRectAndLine()
24 */
25 static void rect_testIntersectRectAndLine (void)
26 {
27 SDL_Rect rect = { 0, 0, 32, 32 };
28 int x1, y1;
29 int x2, y2;
30 SDL_bool clipped;
31
32 SDL_ATbegin( "IntersectRectAndLine" );
33
34 x1 = -10;
35 y1 = 0;
36 x2 = -10;
37 y2 = 31;
38 clipped = SDL_IntersectRectAndLine(&rect, &x1, &y1, &x2, &y2);
39 SDL_ATvassert( !clipped &&
40 x1 == -10 && y1 == 0 && x2 == -10 && y2 == 31,
41 "line outside to the left was incorrectly clipped: %d,%d - %d,%d",
42 x1, y1, x2, y2);
43
44 x1 = 40;
45 y1 = 0;
46 x2 = 40;
47 y2 = 31;
48 clipped = SDL_IntersectRectAndLine(&rect, &x1, &y1, &x2, &y2);
49 SDL_ATvassert( !clipped &&
50 x1 == 40 && y1 == 0 && x2 == 40 && y2 == 31,
51 "line outside to the right was incorrectly clipped: %d,%d - %d,%d",
52 x1, y1, x2, y2);
53
54 x1 = 0;
55 y1 = -10;
56 x2 = 31;
57 y2 = -10;
58 clipped = SDL_IntersectRectAndLine(&rect, &x1, &y1, &x2, &y2);
59 SDL_ATvassert( !clipped &&
60 x1 == 0 && y1 == -10 && x2 == 31 && y2 == -10,
61 "line outside above was incorrectly clipped: %d,%d - %d,%d",
62 x1, y1, x2, y2);
63
64 x1 = 0;
65 y1 = 40;
66 x2 = 31;
67 y2 = 40;
68 clipped = SDL_IntersectRectAndLine(&rect, &x1, &y1, &x2, &y2);
69 SDL_ATvassert( !clipped &&
70 x1 == 0 && y1 == 40 && x2 == 31 && y2 == 40,
71 "line outside below was incorrectly clipped: %d,%d - %d,%d",
72 x1, y1, x2, y2);
73
74 x1 = 0;
75 y1 = 0;
76 x2 = 31;
77 y2 = 31;
78 clipped = SDL_IntersectRectAndLine(&rect, &x1, &y1, &x2, &y2);
79 SDL_ATvassert( clipped &&
80 x1 == 0 && y1 == 0 && x2 == 31 && y2 == 31,
81 "line fully inside rect was clipped: %d,%d - %d,%d",
82 x1, y1, x2, y2);
83
84 x1 = -10;
85 y1 = 15;
86 x2 = 40;
87 y2 = 15;
88 clipped = SDL_IntersectRectAndLine(&rect, &x1, &y1, &x2, &y2);
89 SDL_ATvassert( clipped &&
90 x1 == 0 && y1 == 15 && x2 == 31 && y2 == 15,
91 "horizontal line rect was incorrectly clipped: %d,%d - %d,%d",
92 x1, y1, x2, y2);
93
94 x1 = -32;
95 y1 = -32;
96 x2 = 63;
97 y2 = 63;
98 clipped = SDL_IntersectRectAndLine(&rect, &x1, &y1, &x2, &y2);
99 SDL_ATvassert( clipped &&
100 x1 == 0 && y1 == 0 && x2 == 31 && y2 == 31,
101 "diagonal line to lower right was incorrectly clipped: %d,%d - %d,%d",
102 x1, y1, x2, y2);
103
104 x1 = 63;
105 y1 = 63;
106 x2 = -32;
107 y2 = -32;
108 clipped = SDL_IntersectRectAndLine(&rect, &x1, &y1, &x2, &y2);
109 SDL_ATvassert( clipped &&
110 x1 == 31 && y1 == 31 && x2 == 0 && y2 == 0,
111 "diagonal line to upper left was incorrectly clipped: %d,%d - %d,%d",
112 x1, y1, x2, y2);
113
114 x1 = 63;
115 y1 = -32;
116 x2 = -32;
117 y2 = 63;
118 clipped = SDL_IntersectRectAndLine(&rect, &x1, &y1, &x2, &y2);
119 SDL_ATvassert( clipped &&
120 x1 == 31 && y1 == 0 && x2 == 0 && y2 == 31,
121 "diagonal line to lower left was incorrectly clipped: %d,%d - %d,%d",
122 x1, y1, x2, y2);
123
124 x1 = -32;
125 y1 = 63;
126 x2 = 63;
127 y2 = -32;
128 clipped = SDL_IntersectRectAndLine(&rect, &x1, &y1, &x2, &y2);
129 SDL_ATvassert( clipped &&
130 x1 == 0 && y1 == 31 && x2 == 31 && y2 == 0,
131 "diagonal line to upper right was incorrectly clipped: %d,%d - %d,%d",
132 x1, y1, x2, y2);
133
134 SDL_ATend();
135 }
136
137
138 /**
139 * @brief Rect test entrypoint.
140 */
141 #ifdef TEST_STANDALONE
142 int main( int argc, const char *argv[] )
143 {
144 (void) argc;
145 (void) argv;
146 #else /* TEST_STANDALONE */
147 int test_rect (void)
148 {
149 #endif /* TEST_STANDALONE */
150
151 SDL_ATinit( "Rect" );
152
153 rect_testIntersectRectAndLine();
154
155 return SDL_ATfinish();
156 }