Export (0) Print
Expand All

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: 4.5.2, 4.5.1, 4.5, 4, 3.5, 3.0

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

Windows 8.1, Windows Server 2012 R2, Windows 8, Windows Server 2012, Windows 7, Windows Vista SP2, Windows Server 2008 (Server Core Role not supported), Windows Server 2008 R2 (Server Core Role supported with SP1 or later; Itanium not supported)

The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.

Show:
© 2014 Microsoft