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fractalPanic.c
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fractalPanic.c
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#include <math.h>
#include <SDL2/SDL.h>
#define SIZE 256
#define PI 3.1415926535
#define FPS 60
void z(SDL_Renderer *renderer, float a, float b, float e, float d, float t) {
if(d > 1) {
a += d * sin(e);
b -= d * cos(e);
SDL_RenderDrawPoint(renderer, a, b);
e -= 2 * sin(t);
d *= .7;
z(renderer, a, b, e, d, t);
e += 2 * sin(t * t);
z(renderer, a, b, e, d, t);
}
}
int main(int argc, char **argv) {
const int frameDelay = 1000 / FPS;
Uint32 frameStart, frameTime;
SDL_Init(SDL_INIT_VIDEO);
SDL_Window *window = SDL_CreateWindow("fractal Panic", SDL_WINDOWPOS_UNDEFINED,
SDL_WINDOWPOS_UNDEFINED, SIZE, SIZE, 0);
SDL_Renderer *renderer = SDL_CreateRenderer(window, -1, SDL_RENDERER_ACCELERATED);
SDL_SetRenderDrawBlendMode(renderer, SDL_BLENDMODE_BLEND);
SDL_bool isRunning = SDL_TRUE;
SDL_Event event;
while(isRunning) {
frameStart = SDL_GetTicks();
while(SDL_PollEvent(&event))
if (event.type==SDL_QUIT || event.type==SDL_KEYDOWN) isRunning=SDL_FALSE;
SDL_SetRenderDrawColor(renderer, 000, 000, 000, SDL_ALPHA_OPAQUE);
SDL_RenderClear(renderer);
SDL_SetRenderDrawColor(renderer, 255, 255, 255, SDL_ALPHA_OPAQUE);
z(renderer, SIZE/2, SIZE*3/4, 0, SIZE/5, fmodf((float)frameStart/5000, 2*PI)-PI);
frameTime = SDL_GetTicks() - frameStart;
if (frameDelay > frameTime) SDL_Delay(frameDelay - frameTime);
SDL_RenderPresent(renderer);
}
SDL_DestroyRenderer(renderer);
SDL_DestroyWindow(window);
SDL_Quit();
return 0;
}