Atlas - main.c
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[FILE BEGIN]
1/*
2 *  rectangles.c
3 *  written by Holmes Futrell
4 *  use however you want
5 */
6
7#include "SDL.h"
8#include <stdio.h>
9#include <stdlib.h>
10#include <time.h>
11
12#define SCREEN_WIDTH 320
13#define SCREEN_HEIGHT 480
14
15int
16randomInt(int min, int max)
17{
18    return min + rand() % (max - min + 1);
19}
20
21void
22render(SDL_Renderer *renderer)
23{
24
25    SDL_Rect rect;
26    Uint8 r, g, b;
27
28    /* Clear the screen */
29    SDL_SetRenderDrawColor(renderer, 0, 0, 0, 255);
30    SDL_RenderClear(renderer);
31
32    /*  Come up with a random rectangle */
33    rect.w = randomInt(64, 128);
34    rect.h = randomInt(64, 128);
35    rect.x = randomInt(0, SCREEN_WIDTH);
36    rect.y = randomInt(0, SCREEN_HEIGHT);
37
38    /* Come up with a random color */
39    r = randomInt(50, 255);
40    g = randomInt(50, 255);
41    b = randomInt(50, 255);
42    SDL_SetRenderDrawColor(renderer, r, g, b, 255);
43
44    /*  Fill the rectangle in the color */
45    SDL_RenderFillRect(renderer, &rect);
46
47    /* update screen */
48    SDL_RenderPresent(renderer);
49}
50
51int
52main(int argc, char *argv[])
53{
54
55    SDL_Window *window;
56    SDL_Renderer *renderer;
57    int done;
58    SDL_Event event;
59
60    /* initialize SDL */
61    if (SDL_Init(SDL_INIT_VIDEO) < 0) {
62        printf("Could not initialize SDL\n");
63        return 1;
64    }
65
66    /* seed random number generator */
67    srand(time(NULL));
68
69    /* create window and renderer */
70    window =
71        SDL_CreateWindow(NULL, 0, 0, SCREEN_WIDTH, SCREEN_HEIGHT,
72                         SDL_WINDOW_OPENGL);
73    if (!window) {
74        printf("Could not initialize Window\n");
75        return 1;
76    }
77
78    renderer = SDL_CreateRenderer(window, -1, 0);
79    if (!renderer) {
80        printf("Could not create renderer\n");
81        return 1;
82    }
83
84    /* Enter render loop, waiting for user to quit */
85    done = 0;
86    while (!done) {
87        while (SDL_PollEvent(&event)) {
88            if (event.type == SDL_QUIT) {
89                done = 1;
90            }
91        }
92        render(renderer);
93        SDL_Delay(1);
94    }
95
96    /* shutdown SDL */
97    SDL_Quit();
98
99    return 0;
100}
101
[FILE END]
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