Matrix.IsIdentity Property


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

 property bool IsIdentity { bool get(); };
public bool IsIdentity { get; }
member this.IsIdentity : bool
Public ReadOnly Property IsIdentity As Boolean

Property Value

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.

Applies to

See also