.{Vec2} := @use("../../../../libraries/stn/src/lib.hb").math;
.{random} := @use("../../../../libraries/stn/src/lib.hb")
render := @use("../../../../libraries/render/src/lib.hb")

/* expected result:
   a square that changes colour bounces around the screen */

example := fn(): void {
	screen := render.init(true)
	vel := Vec2(int).(1, 1)
	side := screen.width / 8
	pos := Vec2(int).((screen.width - side) / 2, (screen.height - side) / 2)
	color := random.range(render.Color, render.black, render.white)
	loop {
		render.put_filled_rect(screen, pos, .(side, side), color)
		render.sync(screen)
		render.clear(screen, render.black)

		if pos.x == 0 | pos.x == screen.width - side {
			vel.x = -vel.x
			color = random.range(render.Color, render.black, render.white)
		}
		if pos.y == 0 | pos.y == screen.height - side {
			vel.y = -vel.y
			color = random.range(render.Color, render.black, render.white)
		}

		pos += vel
	}
	return
}