sinusoid shit

sinusoidshit.c

#include <SDL/SDL.h>
#include <SDL/SDL_draw.h>
#include <stdio.h>
#include <math.h>

SDL_Surface* screen;
Uint8 *keys;

int done;
int main(int argc, char *argv[])
{
	SDL_Init(SDL_INIT_EVERYTHING);
	atexit(SDL_Quit);
	screen = SDL_SetVideoMode(800, 600, 32, SDL_SWSURFACE);
	keys = SDL_GetKeyState(NULL);

	while (!done) {
		SDL_FillRect(screen, NULL, 0);
		SDL_PumpEvents();

		if (keys[SDLK_ESCAPE])
			exit(0);

	{	
		int i, j;
		Uint32 t = SDL_GetTicks() >> 2;
		t =  51. + 50. * sin(t * M_PI / 220.);
		printf("%d\n", t);
		for (i = 0; i < 600; i++) {
			for (j = 0; j < 800; j++) {
				int i2 = (600 / 2- i);
				i2 *= i2;
				int j2 = (800 / 2- j);
				j2 *= j2;
				int col = 125. + 12500. * sin(sqrt(j2/t + i2/t)) / sqrt(j2 + i2);
				//printf("%d\n", col);
				if (col < 0 || col > 255)
					continue;
				Draw_Pixel(screen, j, i, SDL_MapRGB(screen->format, col, col, col));
			}
		}
		SDL_UpdateRect(screen, 0, 0, 800, 600);
	}

	}

	return 0;
}