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Matrix.SetIdentity Method

Changes this Matrix structure into an identity matrix.

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

public void SetIdentity()

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 turn a Matrix structure into an 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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