/* s and e are integers modulo 360 (degrees), with 0 degrees  being the rightmost extreme and degrees changing clockwise.  cx and cy are the center in pixels; w and h are the horizontal   and vertical diameter in pixels. Nice interface, but slow, since  I don't yet use Bresenham (I'm using an inefficient but  simple solution with too much work going on in it; generalizing  Bresenham to ellipses and partial arcs of ellipses is non-trivial,  at least for me) and there are other inefficiencies (small circles  do far too much work). */void gdImageArc(gdImagePtr im, int cx, int cy, int w, int h, int s, int e, int color){	int i;	int lx = 0, ly = 0;	int w2, h2;	w2 = w/2;	h2 = h/2;	while (e < s) {		e += 360;	}	for (i=s; (i <= e); i++) {		int x, y;		x = ((long)gdCosT[i % 360] * (long)w2 / 1024) + cx; 		y = ((long)gdSinT[i % 360] * (long)h2 / 1024) + cy;		if (i != s) {			gdImageLine(im, lx, ly, x, y, color);			}		lx = x;		ly = y;	}}