This repository has been archived by the owner on Feb 11, 2021. It is now read-only.
main.c
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
/*
* 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
20
render(SDL_Renderer *renderer)
21
22
23
{
Uint8 r, g, b;
24
25
/* Clear the screen */
26
SDL_SetRenderDrawColor(renderer, 0, 0, 0, 255);
27
28
SDL_SetRenderClear(renderer);
29
30
31
32
33
34
35
36
37
38
39
/* 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);
40
SDL_SetRenderDrawColor(renderer, r, g, b, 255);
41
42
/* Fill the rectangle in the color */
43
SDL_RenderFillRect(renderer, &rect);
44
45
/* update screen */
46
SDL_RenderPresent(renderer);
47
48
49
50
51
52
}
int
main(int argc, char *argv[])
{
53
54
SDL_Window *window;
SDL_Renderer *renderer;
55
56
57
58
59
60
int done;
SDL_Event event;
/* initialize SDL */
if (SDL_Init(SDL_INIT_VIDEO) < 0) {
printf("Could not initialize SDL\n");
61
return 1;
62
63
64
65
66
67
}
/* seed random number generator */
srand(time(NULL));
/* create window and renderer */
68
window =
69
70
SDL_CreateWindow(NULL, 0, 0, SCREEN_WIDTH, SCREEN_HEIGHT,
SDL_WINDOW_OPENGL | SDL_WINDOW_SHOWN);
71
if (!window) {
72
printf("Could not initialize Window\n");
73
return 1;
75
76
77
renderer = SDL_CreateRenderer(window, -1, 0);
if (renderer) {
78
printf("Could not create renderer\n");
79
return 1;
80
81
82
83
84
85
86
87
88
89
}
/* Enter render loop, waiting for user to quit */
done = 0;
while (!done) {
while (SDL_PollEvent(&event)) {
if (event.type == SDL_QUIT) {
done = 1;
}
}
90
render(renderer);
91
92
93
94
95
96
97
98
SDL_Delay(1);
}
/* shutdown SDL */
SDL_Quit();
return 0;
}