MARKUS

using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

using System.Threading.Tasks;

using System.Windows;

using System.Windows.Media;

namespace KCOM.Common

{

    public static class MathHelper

    {

        public static Point RotatePoint(Point p1, Point p2, double angle)

        {

            double radians = ConvertToRadians(angle);

            double sin = Math.Sin(radians);

            double cos = Math.Cos(radians);

            // Translate point back to origin

            p1.X -= p2.X;

            p1.Y -= p2.Y;

            // Rotate point

            double xnew = p1.X * cos - p1.Y * sin;

            double ynew = p1.X * sin + p1.Y * cos;

            // Translate point back

            Point newPoint = new Point((int)xnew + p2.X, (int)ynew + p2.Y);

            return newPoint;

        }

        public static double ConvertToRadians(double angle)

        {

            return (Math.PI / 360) * angle;

        }

        public static Rect RotateRect(Rect rect,Point Center,double angle)

        {

            Rect rotateRect = rect;

            var centerPoint = new Point(rect.X,rect.Y);

            var rotationCenter = RotatePoint(centerPoint, Center, angle);

            if (angle == 270 || angle == 90)

            {

                rotateRect = new Rect(0,0, rect.Height, rect.Width);

            }

            else

            {

                rotateRect = new Rect(0,0, rect.Width, rect.Height);

            }

            rotateRect.X = rotationCenter.X;

            rotateRect.Y = rotationCenter.Y;

            return rotateRect;

        }

    }

}