SDL 2.0
testintersections.c
Go to the documentation of this file.
1/*
2 Copyright (C) 1997-2019 Sam Lantinga <slouken@libsdl.org>
3
4 This software is provided 'as-is', without any express or implied
5 warranty. In no event will the authors be held liable for any damages
6 arising from the use of this software.
7
8 Permission is granted to anyone to use this software for any purpose,
9 including commercial applications, and to alter it and redistribute it
10 freely.
11*/
12
13/* Simple program: draw as many random objects on the screen as possible */
14
15#include <stdlib.h>
16#include <stdio.h>
17#include <time.h>
18
19#ifdef __EMSCRIPTEN__
20#include <emscripten/emscripten.h>
21#endif
22
23#include "SDL_test_common.h"
24
25#define SWAP(typ,a,b) do{typ t=a;a=b;b=t;}while(0)
26#define NUM_OBJECTS 100
27
29static int num_objects;
32static int cycle_direction = 1;
33static int current_alpha = 255;
34static int current_color = 255;
36
38int done;
39
40void
42{
43 int i;
44 int x, y;
46
47 /* Query the sizes */
49
50 for (i = 0; i < num_objects * 4; ++i) {
51 /* Cycle the color and alpha, if desired */
52 if (cycle_color) {
54 if (current_color < 0) {
55 current_color = 0;
57 }
58 if (current_color > 255) {
59 current_color = 255;
61 }
62 }
63 if (cycle_alpha) {
65 if (current_alpha < 0) {
66 current_alpha = 0;
68 }
69 if (current_alpha > 255) {
70 current_alpha = 255;
72 }
73 }
76
77 x = rand() % viewport.w;
78 y = rand() % viewport.h;
80 }
81}
82
83#define MAX_LINES 16
84int num_lines = 0;
86static int
87add_line(int x1, int y1, int x2, int y2)
88{
89 if (num_lines >= MAX_LINES)
90 return 0;
91 if ((x1 == x2) && (y1 == y2))
92 return 0;
93
94 SDL_Log("adding line (%d, %d), (%d, %d)\n", x1, y1, x2, y2);
99
100 return ++num_lines;
101}
102
103
104void
106{
107 int i;
109
110 /* Query the sizes */
112
113 SDL_SetRenderDrawColor(renderer, 255, 255, 255, 255);
114
115 for (i = 0; i < num_lines; ++i) {
116 if (i == -1) {
121 } else {
123 }
124 }
125}
126
127#define MAX_RECTS 16
128int num_rects = 0;
130static int
131add_rect(int x1, int y1, int x2, int y2)
132{
133 if (num_rects >= MAX_RECTS)
134 return 0;
135 if ((x1 == x2) || (y1 == y2))
136 return 0;
137
138 if (x1 > x2)
139 SWAP(int, x1, x2);
140 if (y1 > y2)
141 SWAP(int, y1, y2);
142
143 SDL_Log("adding rect (%d, %d), (%d, %d) [%dx%d]\n", x1, y1, x2, y2,
144 x2 - x1, y2 - y1);
145
146 rects[num_rects].x = x1;
147 rects[num_rects].y = y1;
148 rects[num_rects].w = x2 - x1;
149 rects[num_rects].h = y2 - y1;
150
151 return ++num_rects;
152}
153
154static void
156{
157 SDL_SetRenderDrawColor(renderer, 255, 127, 0, 255);
159}
160
161static void
163{
164 int i, j;
165
166 SDL_SetRenderDrawColor(renderer, 0, 255, 55, 255);
167
168 for (i = 0; i < num_rects; i++)
169 for (j = 0; j < num_lines; j++) {
170 int x1, y1, x2, y2;
171 SDL_Rect r;
172
173 r = rects[i];
174 x1 = lines[j].x;
175 y1 = lines[j].y;
176 x2 = lines[j].w;
177 y2 = lines[j].h;
178
179 if (SDL_IntersectRectAndLine(&r, &x1, &y1, &x2, &y2)) {
181 }
182 }
183}
184
185static void
187{
188 int i, j;
189
190 SDL_SetRenderDrawColor(renderer, 255, 200, 0, 255);
191
192 for (i = 0; i < num_rects; i++)
193 for (j = i + 1; j < num_rects; j++) {
194 SDL_Rect r;
195 if (SDL_IntersectRect(&rects[i], &rects[j], &r)) {
197 }
198 }
199}
200
201void
203{
204 int i;
206
207 /* Check for events */
208 while (SDL_PollEvent(&event)) {
210 switch (event.type) {
212 mouse_begin_x = event.button.x;
213 mouse_begin_y = event.button.y;
214 break;
216 if (event.button.button == 3)
218 event.button.y);
219 if (event.button.button == 1)
221 event.button.y);
222 break;
223 case SDL_KEYDOWN:
224 switch (event.key.keysym.sym) {
225 case 'l':
226 if (event.key.keysym.mod & KMOD_SHIFT)
227 num_lines = 0;
228 else
229 add_line(rand() % 640, rand() % 480, rand() % 640,
230 rand() % 480);
231 break;
232 case 'r':
233 if (event.key.keysym.mod & KMOD_SHIFT)
234 num_rects = 0;
235 else
236 add_rect(rand() % 640, rand() % 480, rand() % 640,
237 rand() % 480);
238 break;
239 }
240 break;
241 default:
242 break;
243 }
244 }
245 for (i = 0; i < state->num_windows; ++i) {
247 if (state->windows[i] == NULL)
248 continue;
249 SDL_SetRenderDrawColor(renderer, 0xA0, 0xA0, 0xA0, 0xFF);
251
257
259 }
260#ifdef __EMSCRIPTEN__
261 if (done) {
262 emscripten_cancel_main_loop();
263 }
264#endif
265}
266
267int
268main(int argc, char *argv[])
269{
270 int i;
271 Uint32 then, now, frames;
272
273 /* Enable standard application logging */
275
276 /* Initialize parameters */
278
279 /* Initialize test framework */
281 if (!state) {
282 return 1;
283 }
284 for (i = 1; i < argc;) {
285 int consumed;
286
287 consumed = SDLTest_CommonArg(state, i);
288 if (consumed == 0) {
289 consumed = -1;
290 if (SDL_strcasecmp(argv[i], "--blend") == 0) {
291 if (argv[i + 1]) {
292 if (SDL_strcasecmp(argv[i + 1], "none") == 0) {
294 consumed = 2;
295 } else if (SDL_strcasecmp(argv[i + 1], "blend") == 0) {
297 consumed = 2;
298 } else if (SDL_strcasecmp(argv[i + 1], "add") == 0) {
300 consumed = 2;
301 } else if (SDL_strcasecmp(argv[i + 1], "mod") == 0) {
303 consumed = 2;
304 }
305 }
306 } else if (SDL_strcasecmp(argv[i], "--cyclecolor") == 0) {
308 consumed = 1;
309 } else if (SDL_strcasecmp(argv[i], "--cyclealpha") == 0) {
311 consumed = 1;
312 } else if (SDL_isdigit(*argv[i])) {
313 num_objects = SDL_atoi(argv[i]);
314 consumed = 1;
315 }
316 }
317 if (consumed < 0) {
318 static const char *options[] = { "[--blend none|blend|add|mod]", "[--cyclecolor]", "[--cyclealpha]", NULL };
319 SDLTest_CommonLogUsage(state, argv[0], options);
320 return 1;
321 }
322 i += consumed;
323 }
325 return 2;
326 }
327
328 /* Create the windows and initialize the renderers */
329 for (i = 0; i < state->num_windows; ++i) {
332 SDL_SetRenderDrawColor(renderer, 0xA0, 0xA0, 0xA0, 0xFF);
334 }
335
336 srand(time(NULL));
337
338 /* Main render loop */
339 frames = 0;
340 then = SDL_GetTicks();
341 done = 0;
342
343#ifdef __EMSCRIPTEN__
344 emscripten_set_main_loop(loop, 0, 1);
345#else
346 while (!done) {
347 ++frames;
348 loop();
349 }
350#endif
351
353
354 /* Print out some timing information */
355 now = SDL_GetTicks();
356 if (now > then) {
357 double fps = ((double) frames * 1000) / (now - then);
358 SDL_Log("%2.2f frames per second\n", fps);
359 }
360 return 0;
361}
362
363/* vi: set ts=4 sw=4 expandtab: */
#define SDL_INIT_VIDEO
Definition: SDL.h:79
SDL_BlendMode
The blend mode used in SDL_RenderCopy() and drawing operations.
Definition: SDL_blendmode.h:41
@ SDL_BLENDMODE_NONE
Definition: SDL_blendmode.h:42
@ SDL_BLENDMODE_ADD
Definition: SDL_blendmode.h:47
@ SDL_BLENDMODE_BLEND
Definition: SDL_blendmode.h:44
@ SDL_BLENDMODE_MOD
Definition: SDL_blendmode.h:50
#define SDL_RenderPresent
#define SDL_RenderGetViewport
#define SDL_PollEvent
#define SDL_RenderFillRect
#define SDL_SetRenderDrawColor
#define SDL_RenderDrawLine
#define SDL_isdigit
#define SDL_SetRenderDrawBlendMode
#define SDL_strcasecmp
#define SDL_RenderDrawPoint
#define SDL_LogSetPriority
#define SDL_RenderClear
#define SDL_atoi
#define SDL_Log
#define SDL_IntersectRect
#define SDL_IntersectRectAndLine
#define SDL_RenderFillRects
@ SDL_MOUSEBUTTONUP
Definition: SDL_events.h:107
@ SDL_MOUSEBUTTONDOWN
Definition: SDL_events.h:106
@ SDL_KEYDOWN
Definition: SDL_events.h:96
#define KMOD_SHIFT
Definition: SDL_keycode.h:343
@ SDL_LOG_PRIORITY_INFO
Definition: SDL_log.h:106
@ SDL_LOG_CATEGORY_APPLICATION
Definition: SDL_log.h:66
GLint GLint GLint GLint GLint GLint y
Definition: SDL_opengl.h:1574
GLdouble GLdouble GLdouble r
Definition: SDL_opengl.h:2079
GLint GLint GLint GLint GLint x
Definition: SDL_opengl.h:1574
struct _cl_event * event
GLfixed GLfixed GLfixed y2
GLfixed y1
GLuint GLfloat GLfloat GLfloat x1
GLfixed GLfixed x2
GLfloat GLfloat GLfloat GLfloat h
GLubyte GLubyte GLubyte GLubyte w
SDL_bool
Definition: SDL_stdinc.h:162
@ SDL_TRUE
Definition: SDL_stdinc.h:164
uint32_t Uint32
Definition: SDL_stdinc.h:203
uint8_t Uint8
Definition: SDL_stdinc.h:179
void SDLTest_CommonQuit(SDLTest_CommonState *state)
Close test window.
SDLTest_CommonState * SDLTest_CommonCreateState(char **argv, Uint32 flags)
Parse command line parameters and create common state.
void SDLTest_CommonEvent(SDLTest_CommonState *state, SDL_Event *event, int *done)
Common event handler for test windows.
int SDLTest_CommonArg(SDLTest_CommonState *state, int index)
Process one common argument.
SDL_bool SDLTest_CommonInit(SDLTest_CommonState *state)
Open test window.
void SDLTest_CommonLogUsage(SDLTest_CommonState *state, const char *argv0, const char **options)
Logs command line usage info.
Uint32 SDL_GetTicks(void)
Get the number of milliseconds since the SDL library initialization.
return Display return Display Bool Bool int int int return Display XEvent Bool(*) XPointer return Display return Display Drawable _Xconst char unsigned int unsigned int return Display Pixmap Pixmap XColor XColor unsigned int unsigned int return Display _Xconst char char int char return Display Visual unsigned int int int char unsigned int unsigned int int in j)
Definition: SDL_x11sym.h:50
return Display return Display Bool Bool int int int return Display XEvent Bool(*) XPointer return Display return Display Drawable _Xconst char unsigned int unsigned int return Display Pixmap Pixmap XColor XColor unsigned int unsigned int return Display _Xconst char char int char return Display Visual unsigned int int int char unsigned int unsigned int in i)
Definition: SDL_x11sym.h:50
#define NULL
Definition: begin_code.h:167
EGLSurface EGLnsecsANDROID time
Definition: eglext.h:518
EGLSurface EGLint * rects
Definition: eglext.h:282
A rectangle, with the origin at the upper left (integer).
Definition: SDL_rect.h:78
int h
Definition: SDL_rect.h:80
int w
Definition: SDL_rect.h:80
int y
Definition: SDL_rect.h:79
int x
Definition: SDL_rect.h:79
SDL_Window ** windows
SDL_Renderer ** renderers
static SDL_Renderer * renderer
#define MAX_LINES
int main(int argc, char *argv[])
static int current_color
#define MAX_RECTS
int mouse_begin_y
static int current_alpha
static int cycle_direction
#define SWAP(typ, a, b)
int num_rects
static void DrawRectLineIntersections(SDL_Renderer *renderer)
static int add_line(int x1, int y1, int x2, int y2)
#define NUM_OBJECTS
static SDL_BlendMode blendMode
int done
static SDL_bool cycle_alpha
int mouse_begin_x
static int add_rect(int x1, int y1, int x2, int y2)
static SDL_bool cycle_color
static int num_objects
static void DrawRectRectIntersections(SDL_Renderer *renderer)
void DrawLines(SDL_Renderer *renderer)
static SDLTest_CommonState * state
SDL_Rect lines[MAX_LINES]
void DrawPoints(SDL_Renderer *renderer)
int num_lines
static void DrawRects(SDL_Renderer *renderer)
void loop()
static Uint32 frames
Definition: testsprite2.c:40
SDL_Rect viewport
Definition: testviewport.c:28
General event structure.
Definition: SDL_events.h:558