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

/* expected result:
       the lines example bounces around the screen */

example := fn(): void {
	screen := render.init(true)

	image := render.new_surface(341, 256)

	p0 := Vec2(int).(0, 0)
	p1 := Vec2(int).(0, image.height)
	render.clear(image, .(100, 50, 0, 255))
	loop if p0.y >= image.height break else {
		render.put_line(image, p0, p1, .(255, 180, 100, 255))
		render.put_line(image, .(image.width, image.height) - p0, .(image.width, image.height) - p1, .(255, 180, 100, 255))
		p0.y += image.height >> 6
		p1.x += image.width >> 6
	}

	vel := Vec2(int).(1, 1)
	pos := Vec2(int).(100, 100)
	loop {
		render.put_surface(screen, image, pos)
		render.sync(screen)
		render.clear(screen, render.black)

		if pos.x == 0 | pos.x == screen.width - image.width {
			vel.x = -vel.x
		}
		if pos.y == 0 | pos.y == screen.height - image.height {
			vel.y = -vel.y
		}

		pos += vel
	}
	return
}