MARKUS

using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

using System.Threading.Tasks;

using System.Windows;

namespace KCOM

{

    public static class VectorExtentions

    {

        public static Point Rotate(this Point pt, double angle, Point center)

        {

            Vector v = new Vector(pt.X - center.X, pt.Y - center.Y).Rotate(angle);

            return new Point(v.X + center.X, v.Y + center.Y);

        }

        public static Vector Rotate(this Vector v, double degrees)

        {

            return v.RotateRadians(degrees * Math.PI / 180);

        }

        public static Vector RotateRadians(this Vector v, double radians)

        {

            double ca = Math.Cos(radians);

            double sa = Math.Sin(radians);

            return new Vector(ca * v.X - sa * v.Y, sa * v.X + ca * v.Y);

        }

    }

}