/*

 *	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(void)

{

    Uint8 r, g, b;

    /*  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);

    /*  Fill the rectangle in the color */

    SDL_RenderFill(r, g, b, 255, &rect);

    /* update screen */

    SDL_RenderPresent();

}

int

main(int argc, char *argv[])

{

    SDL_WindowID windowID;

    int done;

    SDL_Event event;

    /* initialize SDL */

    if (SDL_Init(SDL_INIT_VIDEO) < 0) {

        printf("Could not initialize SDL\n");

    }

    /* seed random number generator */

    srand(time(NULL));

    /* create window and renderer */

    windowID =

        SDL_CreateWindow(NULL, 0, 0, SCREEN_WIDTH, SCREEN_HEIGHT,

                         SDL_WINDOW_OPENGL | SDL_WINDOW_SHOWN);

    if (windowID == 0) {

        printf("Could not initialize Window\n");

    }

    if (SDL_CreateRenderer(windowID, -1, 0) != 0) {

        printf("Could not create renderer\n");

    }

    /* Fill screen with black */

    SDL_RenderFill(0, 0, 0, 0, NULL);

    /* Enter render loop, waiting for user to quit */

    done = 0;

    while (!done) {

        while (SDL_PollEvent(&event)) {

            if (event.type == SDL_QUIT) {

                done = 1;

            }

        }

        render();

        SDL_Delay(1);

    }

    /* shutdown SDL */

    SDL_Quit();

    return 0;

}