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Matrix.Identity Property

Gets an identity Matrix.

Namespace:  System.Windows.Media
Assembly:  WindowsBase (in WindowsBase.dll)

public static Matrix Identity { get; }

Property Value

Type: System.Windows.Media.Matrix
An identity matrix.

An identity matrix has a value of 1 in coefficients [1,1],[2,2],[3,3] and a value of 0 in the rest of the coefficients. This correlates to setting M11 and M22 to 1 and M12, M21, OffsetX, and OffsetY to 0. In an affine matrix, which is the implementation that Windows Presentation Foundation (WPF) uses for the Matrix, structure, coefficients [3,1],[3,2],[3.3] are implied to always have the values 0,0,1 respectively.

1

0

0

0

1

0

0

0

1

For an identity matrix, the ToString method returns the string "Identity" instead of the coefficients of the Matrix.

The following example shows how to retrieve the Identity matrix.

private Matrix identityExample()
{

    // Get the identity matrix, which is equal to  
    // (1,0,0,1,0,0). 
    Matrix myMatrix = Matrix.Identity;


    Matrix m = new Matrix(1,0,0,1,0,0);

    return myMatrix;


}

.NET Framework

Supported in: 4.6, 4.5, 4, 3.5, 3.0

.NET Framework Client Profile

Supported in: 4, 3.5 SP1
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