System.Windows.Controls.Extensions.Invert C# (CSharp) Method

Invert() public static method

Inverts a Matrix. The Invert functionality on the Matrix type is internal to the framework only. Since Matrix is a struct, an out parameter must be presented.
public static Invert ( this m, System.Windows.Media.Matrix &outputMatrix ) : bool
m this The Matrix object.
outputMatrix System.Windows.Media.Matrix The matrix to return by an output /// parameter.
return bool
        public static bool Invert(this Matrix m, out Matrix outputMatrix)
        {
            double determinant = m.M11 * m.M22 - m.M12 * m.M21;
            if(determinant == 0.0)
            {
                outputMatrix = m;
                return false;
            }

            Matrix matCopy = m;
            m.M11 = matCopy.M22 / determinant;
            m.M12 = -1 * matCopy.M12 / determinant;
            m.M21 = -1 * matCopy.M21 / determinant;
            m.M22 = matCopy.M11 / determinant;
            m.OffsetX = (matCopy.OffsetY * matCopy.M21 - matCopy.OffsetX * matCopy.M22) / determinant;
            m.OffsetY = (matCopy.OffsetX * matCopy.M12 - matCopy.OffsetY * matCopy.M11) / determinant;

            outputMatrix = m;
            return true;
        }