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