testintersections.c
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/*
Copyright (C) 1997-2016 Sam Lantinga <slouken@libsdl.org>
This software is provided 'as-is', without any express or implied
warranty. In no event will the authors be held liable for any damages
arising from the use of this software.
Permission is granted to anyone to use this software for any purpose,
including commercial applications, and to alter it and redistribute it
freely.
*/
/* Simple program: draw as many random objects on the screen as possible */
#include <stdlib.h>
#include <stdio.h>
#include <time.h>
#ifdef __EMSCRIPTEN__
#include <emscripten/emscripten.h>
#endif
#include "SDL_test_common.h"
#define SWAP(typ,a,b) do{typ t=a;a=b;b=t;}while(0)
#define NUM_OBJECTS 100
static SDLTest_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;
int mouse_begin_x = -1, mouse_begin_y = -1;
int done;
void
DrawPoints(SDL_Renderer * renderer)
{
int i;
int x, y;
SDL_Rect viewport;
/* Query the sizes */
SDL_RenderGetViewport(renderer, &viewport);
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(renderer, 255, (Uint8) current_color,
(Uint8) current_color, (Uint8) current_alpha);
x = rand() % viewport.w;
y = rand() % viewport.h;
SDL_RenderDrawPoint(renderer, x, y);
}
}
#define MAX_LINES 16
int num_lines = 0;
SDL_Rect lines[MAX_LINES];
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;
SDL_Log("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
DrawLines(SDL_Renderer * renderer)
{
int i;
SDL_Rect viewport;
/* Query the sizes */
SDL_RenderGetViewport(renderer, &viewport);
SDL_SetRenderDrawColor(renderer, 255, 255, 255, 255);
for (i = 0; i < num_lines; ++i) {
if (i == -1) {
SDL_RenderDrawLine(renderer, 0, 0, viewport.w - 1, viewport.h - 1);
SDL_RenderDrawLine(renderer, 0, viewport.h - 1, viewport.w - 1, 0);
SDL_RenderDrawLine(renderer, 0, viewport.h / 2, viewport.w - 1, viewport.h / 2);
SDL_RenderDrawLine(renderer, viewport.w / 2, 0, viewport.w / 2, viewport.h - 1);
} else {
SDL_RenderDrawLine(renderer, lines[i].x, lines[i].y, lines[i].w, lines[i].h);
}
}
}
#define MAX_RECTS 16
int num_rects = 0;
SDL_Rect rects[MAX_RECTS];
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;
if (x1 > x2)
SWAP(int, x1, x2);
if (y1 > y2)
SWAP(int, y1, y2);
SDL_Log("adding rect (%d, %d), (%d, %d) [%dx%d]\n", x1, y1, x2, y2,
x2 - x1, y2 - y1);
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
DrawRects(SDL_Renderer * renderer)
{
SDL_SetRenderDrawColor(renderer, 255, 127, 0, 255);
SDL_RenderFillRects(renderer, rects, num_rects);
}
static void
DrawRectLineIntersections(SDL_Renderer * renderer)
{
int i, j;
SDL_SetRenderDrawColor(renderer, 0, 255, 55, 255);
for (i = 0; i < num_rects; i++)
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_RenderDrawLine(renderer, x1, y1, x2, y2);
}
}
}
static void
DrawRectRectIntersections(SDL_Renderer * renderer)
{
int i, j;
SDL_SetRenderDrawColor(renderer, 255, 200, 0, 255);
for (i = 0; i < num_rects; i++)
for (j = i + 1; j < num_rects; j++) {
SDL_Rect r;
if (SDL_IntersectRect(&rects[i], &rects[j], &r)) {
SDL_RenderFillRect(renderer, &r);
}
}
}
void
loop()
{
int i;
SDL_Event event;
/* Check for events */
while (SDL_PollEvent(&event)) {
SDLTest_CommonEvent(state, &event, &done);
switch (event.type) {
case SDL_MOUSEBUTTONDOWN:
mouse_begin_x = event.button.x;
mouse_begin_y = event.button.y;
break;
case SDL_MOUSEBUTTONUP:
if (event.button.button == 3)
add_line(mouse_begin_x, mouse_begin_y, event.button.x,
event.button.y);
if (event.button.button == 1)
add_rect(mouse_begin_x, mouse_begin_y, event.button.x,
event.button.y);
break;
case SDL_KEYDOWN:
switch (event.key.keysym.sym) {
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;
}
break;
default:
break;
}
}
for (i = 0; i < state->num_windows; ++i) {
SDL_Renderer *renderer = state->renderers[i];
if (state->windows[i] == NULL)
continue;
SDL_SetRenderDrawColor(renderer, 0xA0, 0xA0, 0xA0, 0xFF);
SDL_RenderClear(renderer);
DrawRects(renderer);
DrawPoints(renderer);
DrawRectRectIntersections(renderer);
DrawLines(renderer);
DrawRectLineIntersections(renderer);
SDL_RenderPresent(renderer);
}
#ifdef __EMSCRIPTEN__
if (done) {
emscripten_cancel_main_loop();
}
#endif
}
int
main(int argc, char *argv[])
{
int i;
Uint32 then, now, frames;
/* Enable standard application logging */
SDL_LogSetPriority(SDL_LOG_CATEGORY_APPLICATION, SDL_LOG_PRIORITY_INFO);
/* Initialize parameters */
num_objects = NUM_OBJECTS;
/* Initialize test framework */
state = SDLTest_CommonCreateState(argv, SDL_INIT_VIDEO);
if (!state) {
return 1;
}
for (i = 1; i < argc;) {
int consumed;
consumed = SDLTest_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], "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) {
SDL_Log("Usage: %s %s [--blend none|blend|add|mod] [--cyclecolor] [--cyclealpha]\n",
argv[0], SDLTest_CommonUsage(state));
return 1;
}
i += consumed;
}
if (!SDLTest_CommonInit(state)) {
return 2;
}
/* Create the windows and initialize the renderers */
for (i = 0; i < state->num_windows; ++i) {
SDL_Renderer *renderer = state->renderers[i];
SDL_SetRenderDrawBlendMode(renderer, blendMode);
SDL_SetRenderDrawColor(renderer, 0xA0, 0xA0, 0xA0, 0xFF);
SDL_RenderClear(renderer);
}
srand(time(NULL));
/* Main render loop */
frames = 0;
then = SDL_GetTicks();
done = 0;
#ifdef __EMSCRIPTEN__
emscripten_set_main_loop(loop, 0, 1);
#else
while (!done) {
++frames;
loop();
}
#endif
SDLTest_CommonQuit(state);
/* Print out some timing information */
now = SDL_GetTicks();
if (now > then) {
double fps = ((double) frames * 1000) / (now - then);
SDL_Log("%2.2f frames per second\n", fps);
}
return 0;
}
/* vi: set ts=4 sw=4 expandtab: */
SDL_RenderDrawPoint
#define SDL_RenderDrawPoint
Definition: SDL_dynapi_overrides.h:341
blendMode
static SDL_BlendMode blendMode
Definition: testintersections.c:35
SDL_PollEvent
#define SDL_PollEvent
Definition: SDL_dynapi_overrides.h:128
DrawLines
void DrawLines(SDL_Renderer *renderer)
Definition: testintersections.c:105
SDL_KEYDOWN
Definition: SDL_events.h:93
x1
GLuint GLfloat GLfloat GLfloat x1
Definition: SDL_opengl_glext.h:8583
cycle_alpha
static SDL_bool cycle_alpha
Definition: testintersections.c:31
r
GLdouble GLdouble GLdouble r
Definition: SDL_opengl.h:2072
main
int main(int argc, char *argv[])
Definition: testintersections.c:268
Uint32
uint32_t Uint32
An unsigned 32-bit integer type.
Definition: SDL_stdinc.h:155
SDL_MOUSEBUTTONUP
Definition: SDL_events.h:104
SDL_BLENDMODE_NONE
Definition: SDL_blendmode.h:42
done
int done
Definition: testintersections.c:38
SDL_MouseButtonEvent::y
Sint32 y
Definition: SDL_events.h:256
x
GLint GLint GLint GLint GLint x
Definition: SDL_opengl.h:1567
SDL_BlendMode
SDL_BlendMode
The blend mode used in SDL_RenderCopy() and drawing operations.
Definition: SDL_blendmode.h:40
mouse_begin_x
int mouse_begin_x
Definition: testintersections.c:37
SDLTest_CommonCreateState
SDLTest_CommonState * SDLTest_CommonCreateState(char **argv, Uint32 flags)
Parse command line parameters and create common state.
Definition: SDL_test_common.c:36
num_lines
int num_lines
Definition: testintersections.c:84
NUM_OBJECTS
#define NUM_OBJECTS
Definition: testintersections.c:26
SDL_RenderFillRect
#define SDL_RenderFillRect
Definition: SDL_dynapi_overrides.h:347
cycle_direction
static int cycle_direction
Definition: testintersections.c:32
y2
GLfixed GLfixed GLfixed y2
Definition: SDL_opengl_glext.h:4583
SDL_MOUSEBUTTONDOWN
Definition: SDL_events.h:103
SDLTest_CommonArg
int SDLTest_CommonArg(SDLTest_CommonState *state, int index)
Process one common argument.
Definition: SDL_test_common.c:83
SDL_SetRenderDrawBlendMode
#define SDL_SetRenderDrawBlendMode
Definition: SDL_dynapi_overrides.h:338
SDL_Renderer
Definition: SDL_sysrender.h:76
DrawRects
static void DrawRects(SDL_Renderer *renderer)
Definition: testintersections.c:155
SDL_strcasecmp
#define SDL_strcasecmp
Definition: SDL_dynapi_overrides.h:425
SDL_test_common.h
SDL_IntersectRect
#define SDL_IntersectRect
Definition: SDL_dynapi_overrides.h:300
SDLTest_CommonInit
SDL_bool SDLTest_CommonInit(SDLTest_CommonState *state)
Open test window.
Definition: SDL_test_common.c:645
mouse_begin_y
int mouse_begin_y
Definition: testintersections.c:37
x2
GLfixed GLfixed x2
Definition: SDL_opengl_glext.h:4583
SDL_BLENDMODE_MOD
Definition: SDL_blendmode.h:50
SDLTest_CommonState::windows
SDL_Window ** windows
Definition: SDL_test_common.h:78
MAX_LINES
#define MAX_LINES
Definition: testintersections.c:83
y1
GLfixed y1
Definition: SDL_opengl_glext.h:4583
DrawPoints
void DrawPoints(SDL_Renderer *renderer)
Definition: testintersections.c:41
SDL_bool
SDL_bool
Definition: SDL_stdinc.h:126
SDLTest_CommonState::num_windows
int num_windows
Definition: SDL_test_common.h:77
renderer
SDL_Renderer * renderer
Definition: testautomation_render.c:27
SDL_Log
#define SDL_Log
Definition: SDL_dynapi_overrides.h:37
SDL_MouseButtonEvent::button
Uint8 button
Definition: SDL_events.h:251
SDL_RenderFillRects
#define SDL_RenderFillRects
Definition: SDL_dynapi_overrides.h:348
SDLTest_CommonEvent
void SDLTest_CommonEvent(SDLTest_CommonState *state, SDL_Event *event, int *done)
Common event handler for test windows.
Definition: SDL_test_common.c:1295
num_rects
int num_rects
Definition: testintersections.c:128
y
GLint GLint GLint GLint GLint GLint y
Definition: SDL_opengl.h:1567
SDL_isdigit
#define SDL_isdigit
Definition: SDL_dynapi_overrides.h:388
SWAP
#define SWAP(typ, a, b)
Definition: testintersections.c:25
SDL_GetTicks
Uint32 SDL_GetTicks(void)
Get the number of milliseconds since the SDL library initialization.
KMOD_SHIFT
#define KMOD_SHIFT
Definition: SDL_keycode.h:335
Uint8
uint8_t Uint8
An unsigned 8-bit integer type.
Definition: SDL_stdinc.h:139
event
struct _cl_event * event
Definition: SDL_opengl_glext.h:2649
SDL_RenderGetViewport
#define SDL_RenderGetViewport
Definition: SDL_dynapi_overrides.h:331
lines
SDL_Rect lines[MAX_LINES]
Definition: testintersections.c:85
DrawRectRectIntersections
static void DrawRectRectIntersections(SDL_Renderer *renderer)
Definition: testintersections.c:186
add_line
static int add_line(int x1, int y1, int x2, int y2)
Definition: testintersections.c:87
SDL_LOG_PRIORITY_INFO
Definition: SDL_log.h:106
SDL_Rect::x
int x
Definition: SDL_rect.h:66
SDL_KeyboardEvent::keysym
SDL_Keysym keysym
Definition: SDL_events.h:196
SDL_TRUE
Definition: SDL_stdinc.h:129
SDLTest_CommonUsage
const char * SDLTest_CommonUsage(SDLTest_CommonState *state)
Returns common usage information.
Definition: SDL_test_common.c:451
SDL_Rect::w
int w
Definition: SDL_rect.h:67
SDL_atoi
#define SDL_atoi
Definition: SDL_dynapi_overrides.h:416
SDLTest_CommonState
Definition: SDL_test_common.h:51
SDLTest_CommonState::renderers
SDL_Renderer ** renderers
Definition: SDL_test_common.h:84
i
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:42
SDL_LogSetPriority
#define SDL_LogSetPriority
Definition: SDL_dynapi_overrides.h:242
loop
void loop()
Definition: testintersections.c:202
NULL
#define NULL
Definition: begin_code.h:143
SDL_Keysym::mod
Uint16 mod
Definition: SDL_keyboard.h:51
DrawRectLineIntersections
static void DrawRectLineIntersections(SDL_Renderer *renderer)
Definition: testintersections.c:162
SDL_RenderClear
#define SDL_RenderClear
Definition: SDL_dynapi_overrides.h:340
SDL_Event::key
SDL_KeyboardEvent key
Definition: SDL_events.h:526
SDL_Rect::h
int h
Definition: SDL_rect.h:67
rects
SDL_Rect rects[MAX_RECTS]
Definition: testintersections.c:129
SDL_BLENDMODE_ADD
Definition: SDL_blendmode.h:47
MAX_RECTS
#define MAX_RECTS
Definition: testintersections.c:127
viewport
SDL_Rect viewport
Definition: testviewport.c:28
current_color
static int current_color
Definition: testintersections.c:34
SDL_Keysym::sym
SDL_Keycode sym
Definition: SDL_keyboard.h:50
num_objects
static int num_objects
Definition: testintersections.c:29
SDL_Event::button
SDL_MouseButtonEvent button
Definition: SDL_events.h:530
SDL_MouseButtonEvent::x
Sint32 x
Definition: SDL_events.h:255
cycle_color
static SDL_bool cycle_color
Definition: testintersections.c:30
current_alpha
static int current_alpha
Definition: testintersections.c:33
SDL_Event
General event structure.
Definition: SDL_events.h:521
SDL_SetRenderDrawColor
#define SDL_SetRenderDrawColor
Definition: SDL_dynapi_overrides.h:336
add_rect
static int add_rect(int x1, int y1, int x2, int y2)
Definition: testintersections.c:131
w
GLubyte GLubyte GLubyte GLubyte w
Definition: SDL_opengl_glext.h:731
SDL_IntersectRectAndLine
#define SDL_IntersectRectAndLine
Definition: SDL_dynapi_overrides.h:303
state
static SDLTest_CommonState * state
Definition: testintersections.c:28
SDL_RenderDrawLine
#define SDL_RenderDrawLine
Definition: SDL_dynapi_overrides.h:343
SDL_LOG_CATEGORY_APPLICATION
Definition: SDL_log.h:66
SDL_Rect::y
int y
Definition: SDL_rect.h:66
SDLTest_CommonQuit
void SDLTest_CommonQuit(SDLTest_CommonState *state)
Close test window.
Definition: SDL_test_common.c:1560
h
GLfloat GLfloat GLfloat GLfloat h
Definition: SDL_opengl_glext.h:1946
SDL_INIT_VIDEO
#define SDL_INIT_VIDEO
Definition: SDL.h:77
SDL_Rect
A rectangle, with the origin at the upper left.
Definition: SDL_rect.h:64
SDL_RenderPresent
#define SDL_RenderPresent
Definition: SDL_dynapi_overrides.h:352
SDL_Event::type
Uint32 type
Definition: SDL_events.h:523
SDL_BLENDMODE_BLEND
Definition: SDL_blendmode.h:44
j
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:42