TextureBrush::ScaleTransform method (gdiplusbrush.h)
The TextureBrush::ScaleTransform method updates this texture brush's current transformation matrix with the product of itself and a scaling matrix.
Syntax
Status ScaleTransform(
[in] REAL sx,
[in] REAL sy,
[in] MatrixOrder order
);
Parameters
[in] sx
Type: REAL
Real number that specifies the amount to scale in the x direction.
[in] sy
Type: REAL
Real number that specifies the amount to scale in the y direction.
[in] order
Type: MatrixOrder
Optional. Element of the MatrixOrder enumeration that specifies the order of the multiplication. MatrixOrderPrepend specifies that the scaling matrix is on the left, and MatrixOrderAppend specifies that the scaling matrix is on the right. The default value is MatrixOrderPrepend.
Return value
Type: Status
If the method succeeds, it returns Ok, which is an element of the Status enumeration.
If the method fails, it returns one of the other elements of the Status enumeration.
Remarks
A single 3×3 matrix can store any sequence of affine transformations. If you have several 3×3 matrices, each of which represents an affine transformation, the product of those matrices is a single 3×3 matrix that represents the entire sequence of transformations. The transformation represented by that product is called a composite transformation. For example, suppose matrix T represents a translation, and matrix S represents a scaling. If matrix M is the product TS, then matrix M represents a composite transformation: first translate, then scale.
The order of matrix multiplication is important. In general, the matrix product RT is not the same as the matrix product TR. In the example given in the previous paragraph, the composite transformation represented by RT (first rotate, then translate) is not the same as the composite transformation represented by TR (first translate, then rotate).
Examples
The following example creates a texture brush and sets the transformation of the brush. The code then uses the transformed brush to fill a rectangle.
VOID Example_ScaleTransform(HDC hdc)
{
Graphics graphics(hdc);
Image image(L"HouseAndTree.Gif");
TextureBrush textureBrush(&image);
textureBrush.RotateTransform(30); // first rotate
textureBrush.ScaleTransform(3, 1, MatrixOrderAppend); // then scale
graphics.FillRectangle(&textureBrush, 0, 0, 400, 200);
}
Requirements
Requirement | Value |
---|---|
Minimum supported client | Windows XP, Windows 2000 Professional [desktop apps only] |
Minimum supported server | Windows 2000 Server [desktop apps only] |
Target Platform | Windows |
Header | gdiplusbrush.h (include Gdiplus.h) |
Library | Gdiplus.lib |
DLL | Gdiplus.dll |
See also
Filling Shapes with a Gradient Brush
Matrix Representation of Transformations
TextureBrush::MultiplyTransform