#include <u.h>
#include <libc.h>
#include <draw.h>
Rectangle canvas;
Image *px;
int dim, rad;
void
drawplane(float z, ulong c){
	uchar abgr[4];
	float x, y;
	Point p;
	int i, j;
	abgr[0] = c;
	abgr[1] = c >> 8;
	abgr[2] = c >> 16;
	abgr[3] = c >> 24;
	loadimage(px, px->r, abgr, 4);
	y = -2.f * z;
	for(i = 3; i < 9; i++){
		x = -2.f * z;
		for(j = 3; j < 9; j++){
			p.x = canvas.min.x + canvas.max.x + (int)(dim * x) >> 1;
			p.y = canvas.min.y + canvas.max.y - (int)(dim * y) >> 1;
			fillellipse(screen, p, rad, rad, px, ZP);
			x += z;
		}
		y += z;
	}
}
void
main(int, char**){
	float x, y, z;
	if(initdraw(nil, nil, "dot perspective") < 0)
		sysfatal("initdraw: %r");
	px = allocimage(display, Rect(0, 0, 1, 1), RGBA32, 1, 0xf0f4efff);
	if(px == nil)
		sysfatal("allocimage: %r");
	canvas = screen->r;
	draw(screen, canvas, display->black, nil, ZP);
	if(Dx(canvas) < Dy(canvas)){
		dim = Dx(canvas);
		canvas.min.y = canvas.min.y + canvas.max.y - dim >> 1;
		canvas.max.y = canvas.min.y + dim;
	}else{
		dim = Dy(canvas);
		canvas.min.x = canvas.min.x + canvas.max.x - dim >> 1;
		canvas.max.x = canvas.min.x + dim;
	}
	rad = dim * .04;
	draw(screen, canvas, px, nil, ZP);
	drawplane(0.18f, setalpha(0xcccccccc, 160));
	drawplane(0.2f, setalpha(0x283618ff, 160));
	drawplane(0.22f, setalpha(0x606c38ff, 160));
	drawplane(0.24f, setalpha(0xbc6c25ff, 160));
	drawplane(0.26f, setalpha(0xdda15eff, 160));
	flushimage(display, 1);
	sleep(9999990);
	exits(nil);
}