This repository has been archived by the owner on Feb 11, 2021. It is now read-only.
/
testintersections.c
363 lines (315 loc) · 10.4 KB
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
/* Simple program: draw as many random objects on the screen as possible */
#include <stdlib.h>
#include <stdio.h>
#include <time.h>
#include "common.h"
#define SWAP(typ,a,b) do{typ t=a;a=b;b=t;}while(0)
#define NUM_OBJECTS 100
static CommonState *state;
static int num_objects;
static SDL_bool cycle_color;
static SDL_bool cycle_alpha;
static int cycle_direction = 1;
static int current_alpha = 255;
static int current_color = 255;
static SDL_BlendMode blendMode = SDL_BLENDMODE_NONE;
void
23
DrawPoints(SDL_Window * window)
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
{
int i;
int x, y;
int window_w, window_h;
/* Query the sizes */
SDL_GetWindowSize(window, &window_w, &window_h);
SDL_SetRenderDrawBlendMode(blendMode);
for (i = 0; i < num_objects * 4; ++i) {
/* Cycle the color and alpha, if desired */
if (cycle_color) {
current_color += cycle_direction;
if (current_color < 0) {
current_color = 0;
cycle_direction = -cycle_direction;
}
if (current_color > 255) {
current_color = 255;
cycle_direction = -cycle_direction;
}
}
if (cycle_alpha) {
current_alpha += cycle_direction;
if (current_alpha < 0) {
current_alpha = 0;
cycle_direction = -cycle_direction;
}
if (current_alpha > 255) {
current_alpha = 255;
cycle_direction = -cycle_direction;
}
}
SDL_SetRenderDrawColor(255, (Uint8) current_color,
(Uint8) current_color, (Uint8) current_alpha);
x = rand() % window_w;
y = rand() % window_h;
62
SDL_RenderDrawPoint(x, y);
63
64
65
66
67
68
69
}
SDL_SetRenderDrawBlendMode(SDL_BLENDMODE_NONE);
}
#define MAX_LINES 16
int num_lines = 0;
SDL_Rect lines[MAX_LINES];
70
71
72
73
74
75
76
static int
add_line(int x1, int y1, int x2, int y2)
{
if (num_lines >= MAX_LINES)
return 0;
if ((x1 == x2) && (y1 == y2))
return 0;
77
78
79
80
81
82
83
84
85
86
87
88
printf("adding line (%d, %d), (%d, %d)\n", x1, y1, x2, y2);
lines[num_lines].x = x1;
lines[num_lines].y = y1;
lines[num_lines].w = x2;
lines[num_lines].h = y2;
return ++num_lines;
}
void
89
DrawLines(SDL_Window * window)
90
91
92
93
94
95
96
97
98
99
100
101
102
{
int i;
int x1, y1, x2, y2;
int window_w, window_h;
/* Query the sizes */
SDL_GetWindowSize(window, &window_w, &window_h);
SDL_SetRenderDrawBlendMode(blendMode);
for (i = 0; i < num_lines; ++i) {
SDL_SetRenderDrawColor(255, 255, 255, 255);
if (i == -1) {
103
104
105
106
SDL_RenderDrawLine(0, 0, window_w - 1, window_h - 1);
SDL_RenderDrawLine(0, window_h - 1, window_w - 1, 0);
SDL_RenderDrawLine(0, window_h / 2, window_w - 1, window_h / 2);
SDL_RenderDrawLine(window_w / 2, 0, window_w / 2, window_h - 1);
107
} else {
108
SDL_RenderDrawLine(lines[i].x, lines[i].y, lines[i].w, lines[i].h);
109
110
111
112
113
114
115
116
}
}
SDL_SetRenderDrawBlendMode(SDL_BLENDMODE_NONE);
}
#define MAX_RECTS 16
int num_rects = 0;
SDL_Rect rects[MAX_RECTS];
117
118
119
120
121
122
123
static int
add_rect(int x1, int y1, int x2, int y2)
{
if (num_rects >= MAX_RECTS)
return 0;
if ((x1 == x2) || (y1 == y2))
return 0;
124
125
126
127
128
if (x1 > x2)
SWAP(int, x1, x2);
if (y1 > y2)
SWAP(int, y1, y2);
129
130
131
printf("adding rect (%d, %d), (%d, %d) [%dx%d]\n", x1, y1, x2, y2,
x2 - x1, y2 - y1);
132
133
134
135
136
137
138
139
140
141
rects[num_rects].x = x1;
rects[num_rects].y = y1;
rects[num_rects].w = x2 - x1;
rects[num_rects].h = y2 - y1;
return ++num_rects;
}
static void
142
DrawRects(SDL_Window * window)
143
144
145
146
147
148
149
150
151
152
{
int i;
int window_w, window_h;
/* Query the sizes */
SDL_GetWindowSize(window, &window_w, &window_h);
SDL_SetRenderDrawBlendMode(SDL_BLENDMODE_NONE);
for (i = 0; i < num_rects; ++i) {
SDL_SetRenderDrawColor(255, 127, 0, 255);
153
SDL_RenderFillRect(&rects[i]);
154
155
156
157
158
}
SDL_SetRenderDrawBlendMode(SDL_BLENDMODE_NONE);
}
static void
159
DrawRectLineIntersections(SDL_Window * window)
160
161
162
163
164
165
166
167
168
{
int i, j, window_w, window_h;
/* Query the sizes */
SDL_GetWindowSize(window, &window_w, &window_h);
SDL_SetRenderDrawBlendMode(SDL_BLENDMODE_NONE);
for (i = 0; i < num_rects; i++)
169
170
171
172
173
174
175
176
177
178
179
180
for (j = 0; j < num_lines; j++) {
int x1, y1, x2, y2;
SDL_Rect r;
r = rects[i];
x1 = lines[j].x;
y1 = lines[j].y;
x2 = lines[j].w;
y2 = lines[j].h;
if (SDL_IntersectRectAndLine(&r, &x1, &y1, &x2, &y2)) {
SDL_SetRenderDrawColor(0, 255, 55, 255);
181
SDL_RenderDrawLine(x1, y1, x2, y2);
182
}
183
184
185
186
187
188
}
SDL_SetRenderDrawBlendMode(SDL_BLENDMODE_NONE);
}
static void
189
DrawRectRectIntersections(SDL_Window * window)
190
191
192
193
194
195
{
int i, j;
SDL_SetRenderDrawBlendMode(SDL_BLENDMODE_NONE);
for (i = 0; i < num_rects; i++)
196
197
198
199
for (j = i + 1; j < num_rects; j++) {
SDL_Rect r;
if (SDL_IntersectRect(&rects[i], &rects[j], &r)) {
SDL_SetRenderDrawColor(255, 200, 0, 255);
200
SDL_RenderFillRect(&r);
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
}
SDL_SetRenderDrawBlendMode(SDL_BLENDMODE_NONE);
}
int
main(int argc, char *argv[])
{
int mouse_begin_x = -1, mouse_begin_y = -1;
int i, done;
SDL_Event event;
Uint32 then, now, frames;
/* Initialize parameters */
num_objects = NUM_OBJECTS;
/* Initialize test framework */
state = CommonCreateState(argv, SDL_INIT_VIDEO);
if (!state) {
return 1;
}
for (i = 1; i < argc;) {
int consumed;
consumed = CommonArg(state, i);
if (consumed == 0) {
consumed = -1;
if (SDL_strcasecmp(argv[i], "--blend") == 0) {
if (argv[i + 1]) {
if (SDL_strcasecmp(argv[i + 1], "none") == 0) {
blendMode = SDL_BLENDMODE_NONE;
consumed = 2;
} else if (SDL_strcasecmp(argv[i + 1], "mask") == 0) {
blendMode = SDL_BLENDMODE_MASK;
consumed = 2;
} else if (SDL_strcasecmp(argv[i + 1], "blend") == 0) {
blendMode = SDL_BLENDMODE_BLEND;
consumed = 2;
} else if (SDL_strcasecmp(argv[i + 1], "add") == 0) {
blendMode = SDL_BLENDMODE_ADD;
consumed = 2;
} else if (SDL_strcasecmp(argv[i + 1], "mod") == 0) {
blendMode = SDL_BLENDMODE_MOD;
consumed = 2;
}
}
} else if (SDL_strcasecmp(argv[i], "--cyclecolor") == 0) {
cycle_color = SDL_TRUE;
consumed = 1;
} else if (SDL_strcasecmp(argv[i], "--cyclealpha") == 0) {
cycle_alpha = SDL_TRUE;
consumed = 1;
} else if (SDL_isdigit(*argv[i])) {
num_objects = SDL_atoi(argv[i]);
consumed = 1;
}
}
if (consumed < 0) {
fprintf(stderr,
"Usage: %s %s [--blend none|mask|blend|add|mod] [--cyclecolor] [--cyclealpha]\n",
argv[0], CommonUsage(state));
return 1;
}
i += consumed;
}
if (!CommonInit(state)) {
return 2;
}
/* Create the windows and initialize the renderers */
for (i = 0; i < state->num_windows; ++i) {
SDL_SelectRenderer(state->windows[i]);
SDL_SetRenderDrawColor(0xA0, 0xA0, 0xA0, 0xFF);
275
SDL_RenderClear();
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
}
srand(time(NULL));
/* Main render loop */
frames = 0;
then = SDL_GetTicks();
done = 0;
while (!done) {
/* Check for events */
++frames;
while (SDL_PollEvent(&event)) {
CommonEvent(state, &event, &done);
switch (event.type) {
case SDL_MOUSEBUTTONDOWN:
if (event.button.which == 0) {
mouse_begin_x = event.button.x;
mouse_begin_y = event.button.y;
}
break;
case SDL_MOUSEBUTTONUP:
if (event.button.which == 0) {
if (event.button.button == 3)
299
300
add_line(mouse_begin_x, mouse_begin_y, event.button.x,
event.button.y);
301
if (event.button.button == 1)
302
303
add_rect(mouse_begin_x, mouse_begin_y, event.button.x,
event.button.y);
304
305
306
307
}
break;
case SDL_KEYDOWN:
switch (event.key.keysym.sym) {
308
309
310
311
312
313
314
315
316
317
318
319
320
321
case 'l':
if (event.key.keysym.mod & KMOD_SHIFT)
num_lines = 0;
else
add_line(rand() % 640, rand() % 480, rand() % 640,
rand() % 480);
break;
case 'r':
if (event.key.keysym.mod & KMOD_SHIFT)
num_rects = 0;
else
add_rect(rand() % 640, rand() % 480, rand() % 640,
rand() % 480);
break;
322
323
324
325
326
}
break;
case SDL_WINDOWEVENT:
switch (event.window.event) {
case SDL_WINDOWEVENT_EXPOSED:
327
SDL_SelectRenderer(SDL_GetWindowFromID(event.window.windowID));
328
SDL_SetRenderDrawColor(0xA0, 0xA0, 0xA0, 0xFF);
329
SDL_RenderClear();
330
331
332
333
334
335
336
337
338
339
break;
}
break;
default:
break;
}
}
for (i = 0; i < state->num_windows; ++i) {
SDL_SelectRenderer(state->windows[i]);
SDL_SetRenderDrawColor(0xA0, 0xA0, 0xA0, 0xFF);
340
SDL_RenderClear();
341
342
343
344
345
346
347
348
349
350
351
DrawRects(state->windows[i]);
DrawPoints(state->windows[i]);
DrawRectRectIntersections(state->windows[i]);
DrawLines(state->windows[i]);
DrawRectLineIntersections(state->windows[i]);
SDL_RenderPresent();
}
}
352
353
CommonQuit(state);
354
355
356
357
358
359
360
361
362
363
/* Print out some timing information */
now = SDL_GetTicks();
if (now > then) {
double fps = ((double) frames * 1000) / (now - then);
printf("%2.2f frames per second\n", fps);
}
return 0;
}
/* vi: set ts=4 sw=4 expandtab: */