Matrix.SetIdentity Method
Definition
Important
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Changes this Matrix structure into an identity matrix.
public:
void SetIdentity();public void SetIdentity ();member this.SetIdentity : unit -> unitPublic Sub SetIdentity ()Examples
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;
}
Remarks
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.
| Column 1 | Column 2 | Column 3 |
|---|---|---|
| 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.
