Matrix.IsIdentity Property

 

Gets a value that indicates whether this Matrix structure is an identity matrix.

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

public bool IsIdentity { get; }

Property Value

Type: System.Boolean

true if the Matrix structure is an identity matrix; otherwise, false. The default is true.

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.

.NET Framework
Available since 3.0
Silverlight
Available since 2.0
Windows Phone Silverlight
Available since 7.0
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