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langton.c
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langton.c
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#include <SDL2/SDL.h>
#define SIZE 256
int main(int argc, char **argv) {
SDL_Init(SDL_INIT_VIDEO);
SDL_Window *window = SDL_CreateWindow("Langton's ant", SDL_WINDOWPOS_CENTERED,
SDL_WINDOWPOS_CENTERED, SIZE, SIZE, SDL_WINDOW_OPENGL);
SDL_Renderer *renderer = SDL_CreateRenderer(window, -1, SDL_RENDERER_ACCELERATED);
SDL_Event event;
char world[SIZE][SIZE] = {0};
enum directions {up=0, left=1, down=2, right=3} dir = up;
SDL_Rect ant = {SIZE/2, SIZE/2, 2, 2};
for (int i = 0; i < 11200; i++) {
if (world[ant.x][ant.y]) {
SDL_SetRenderDrawColor(renderer, 0, 0, 0, SDL_ALPHA_OPAQUE);
world[ant.x][ant.y] = 0;
dir = (dir + 1) % 4;
}
else {
SDL_SetRenderDrawColor(renderer, 255, 255, 255, SDL_ALPHA_OPAQUE);
world[ant.x][ant.y] = 1;
dir = (dir - 1) % 4;
}
SDL_RenderFillRect(renderer, &ant);
SDL_RenderPresent(renderer);
switch (dir) {
case up: ant.y -=3 ; break;
case down: ant.y +=3 ; break;
case left: ant.x -=3 ; break;
case right: ant.x +=3 ; break;
}
}
SDL_RenderPresent(renderer);
while(SDL_TRUE)
if (SDL_PollEvent(&event) && (event.type==SDL_QUIT || event.type==SDL_KEYDOWN)) break;
else SDL_Delay(256);
SDL_DestroyRenderer(renderer);
SDL_DestroyWindow(window);
SDL_Quit();
return 0;
}