Matrix Struct

Definition

Namespace:

Windows.UI.Xaml.Media

Represents a 3 × 3 affine transformation matrix used for transformations in two-dimensional space.

public value class Matrix

/// [Windows.Foundation.Metadata.ContractVersion(Windows.Foundation.UniversalApiContract, 65536)]
struct Matrix

[Windows.Foundation.Metadata.ContractVersion(typeof(Windows.Foundation.UniversalApiContract), 65536)]
public struct Matrix

Public Structure Matrix

<Matrix .../>
- or -
<object property="m11,m12,m21,m22,offsetX,offsetY"/>
- or -
<object property="m11 m12 m21 m22 offsetX offsetY"/>
-or-
<object property="Identity"/>

Inheritance

ValueType

Matrix

Attributes

ContractVersionAttribute

Windows requirements

Device family	Windows 10 (introduced in 10.0.10240.0)
API contract	Windows.Foundation.UniversalApiContract (introduced in v1.0)

Examples

This example XAML defines a Matrix that provides data for a MatrixTransform applied to a rectangular shape. In this case, the matrix combines an offset (OffsetX and OffsetY) and a skew (M12). Note that this same effect could have been produced by combining a TranslateTransform and a SkewTransform. Whether to use a single Matrix or combinations of discrete transforms is a matter of coding style; the results are identical.

<Rectangle Width="100" Height="100" Fill="Red">
    <Rectangle.RenderTransform>
        <MatrixTransform Matrix="1,0,0,1,200,0">
        </MatrixTransform>
    </Rectangle.RenderTransform>
</Rectangle>

Remarks

A 3×3 matrix is used for transformations in a two-dimensional x-y plane. Affine transformation matrices can be multiplied to form any number of linear transformations, such as rotation and skew (shear), followed by translation. An affine transformation matrix has its final column equal to (0, 0, 1), so only the members in the first two columns need to be specified. Note that vectors are expressed as row-vectors, not column vectors.

A Matrix is stored using row-major order and has the following structure:

M11	M12	0
M21	M22	0
OffsetX	OffsetY	1

The members in the last row, OffsetX and OffsetY, represent translation values.

In methods and properties, the transformation matrix is usually specified as a vector with only six members, as follows: (M11, M12, M21, M22, OffsetX, OffsetY)

Although you can use a Matrix structure directly to translate individual points, or with a MatrixTransform to transform objects, the Windows Runtime also provides a set of classes that can transform objects without working directly with matrices:

• RotateTransform
• ScaleTransform
• SkewTransform
• TranslateTransform

Properties of a Matrix can be animated (as one or more DoubleAnimation animations or DoubleAnimationUsingKeyFrames).

Matrix is the property value for the MatrixTransform.Matrix property. Related types can be used for transformation matrices in three-dimensional space and then used for a projection. See Matrix3D and Matrix3DProjection.

Language projections and members of Matrix

If you are using a Microsoft .NET language (C# or Microsoft Visual Basic), or in Visual C++ component extensions (C++/CX) then Matrix has non-data members available, and its data members are exposed as read-write properties, not fields.

If you are programming with C++ using the Windows Runtime Template Library (WRL), then only the data member fields exist as members of Matrix, and you cannot use the utility methods or properties listed in the members table. WRL code can access similar utility methods that exist on the MatrixHelper class.

Fields

M11	The value of the first row and first column of this Matrix structure.
M12	The value of the first row and second column of this Matrix structure.
M21	The value of the second row and first column of this Matrix structure.
M22	The value of the second row and second column of this Matrix structure.
OffsetX	Gets or sets the value of the third row and first column of this Matrix structure.
OffsetY	Gets or sets the value of the third row and second column of this Matrix structure.