If you need to rotate a point around another point in 2D then here is a nice function. The below is in C#.

/// <summary> /// Rotates 'p1' about 'p2' by 'angle' degrees clockwise. /// </summary> /// <param name="p1">Point to be rotated</param> /// <param name="p2">Point to rotate around</param> /// <param name="angle">Angle in degrees to rotate clockwise</param> /// <returns>The rotated point</returns> public 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 double ConvertToRadians(double angle) { return (Math.PI / 180) * angle; }

Enjoy ðŸ™‚