#include <stdio.h>

#include <stdlib.h>

#include <gd.h>

int main(void)

{

	int i;

	FILE * out;

	gdImagePtr im;

	gdImagePtr prev =NULL;

	int black;

	im = gdImageCreate(100, 100);

	if (!im) {

		fprintf(stderr, "can't create image");

		return 1;

	}

	out = fopen("anim.gif", "wb");

	if (!out) {

		fprintf(stderr, "can't create file %s", "anim.gif");

		return 1;

	}

	gdImageColorAllocate(im, 255, 255, 255); /* allocate white as side effect */

	gdImageGifAnimBegin(im, out, 1, -1);

	for(i = 0; i < 20; i++) {

		int r,g,b;

		im = gdImageCreate(100, 100);

		r = rand() % 255;

		g = rand() % 255;

		b = rand() % 255;

		gdImageColorAllocate(im, 255, 255, 255);  /* allocate white as side effect */

		black = gdImageColorAllocate(im,  r, g, b);

		printf("(%i, %i, %i)\n",r, g, b);

		gdImageFilledRectangle(im, rand() % 100, rand() % 100, rand() % 100, rand() % 100, black);

		gdImageGifAnimAdd(im, out, 1, 0, 0, 10, 1, prev);

		if(prev) {

			gdImageDestroy(prev);

		}

		prev = im;

	}

	gdImageGifAnimEnd(out);

	fclose(out);

	return 0;

}