Function polarAngle

contents/graham_scan/code/go/graham.go:17–19

(ref, point point)

}

func polarAngle(ref, point point) float64 {
	return math.Atan2(float64(point.y-ref.y), float64(point.x-ref.x))
}

func grahamScan(points []point) []point {
	sort.Slice(points, func(a, b int) bool {