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