main.c
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/*
* rectangles.c
* written by Holmes Futrell
* use however you want
*/
#include "SDL.h"
#include <time.h>
#define SCREEN_WIDTH 320
#define SCREEN_HEIGHT 480
int
randomInt(int min, int max)
{
return min + rand() % (max - min + 1);
}
void
render(SDL_Renderer *renderer)
{
Uint8 r, g, b;
/* Clear the screen */
SDL_SetRenderDrawColor(renderer, 0, 0, 0, 255);
SDL_RenderClear(renderer);
/* Come up with a random rectangle */
SDL_Rect rect;
rect.w = randomInt(64, 128);
rect.h = randomInt(64, 128);
rect.x = randomInt(0, SCREEN_WIDTH);
rect.y = randomInt(0, SCREEN_HEIGHT);
/* Come up with a random color */
r = randomInt(50, 255);
g = randomInt(50, 255);
b = randomInt(50, 255);
SDL_SetRenderDrawColor(renderer, r, g, b, 255);
/* Fill the rectangle in the color */
SDL_RenderFillRect(renderer, &rect);
/* update screen */
SDL_RenderPresent(renderer);
}
int
main(int argc, char *argv[])
{
SDL_Window *window;
SDL_Renderer *renderer;
int done;
SDL_Event event;
/* initialize SDL */
if (SDL_Init(SDL_INIT_VIDEO) < 0) {
printf("Could not initialize SDL\n");
return 1;
}
/* seed random number generator */
srand(time(NULL));
/* create window and renderer */
window =
SDL_CreateWindow(NULL, 0, 0, SCREEN_WIDTH, SCREEN_HEIGHT,
SDL_WINDOW_OPENGL);
if (!window) {
printf("Could not initialize Window\n");
return 1;
}
renderer = SDL_CreateRenderer(window, -1, 0);
if (!renderer) {
printf("Could not create renderer\n");
return 1;
}
/* Enter render loop, waiting for user to quit */
done = 0;
while (!done) {
while (SDL_PollEvent(&event)) {
if (event.type == SDL_QUIT) {
done = 1;
}
}
render(renderer);
SDL_Delay(1);
}
/* shutdown SDL */
SDL_Quit();
return 0;
}