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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

Supported in: 4, 3.5, 3.0

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2

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