Function cohenSutherlandOutcode

util.go:887–900

(rect Rect, p Point, eps float64)

////////////////////////////////////////////////////////////////

func cohenSutherlandOutcode(rect Rect, p Point, eps float64) int {
	code := 0b0000
	if p.X < rect.X0-eps {
		code |= 0b0001 // left
	} else if rect.X1+eps < p.X {
		code |= 0b0010 // right
	}
	if p.Y < rect.Y0-eps {
		code |= 0b0100 // bottom
	} else if rect.Y1+eps < p.Y {
		code |= 0b1000 // top
	}
	return code
}

// return whether line is inside the rectangle, either entirely or partially.
func cohenSutherlandLineClip(rect Rect, a, b Point, eps float64) (Point, Point, bool, bool) {