描述

 

获取此路径渐变刷的变换矩阵.

 

C++ Syntax

 

 

FreeBASIC 语法

 

 

参数

 

pMatrix

 

[out]指向Matrix对象接收变换矩阵.

 

返回值

 

如果该方法成功,则返回Ok,这是对Status枚举元素.

如果这个方法失败,它返回一个枚举的其他元素的Status.

 

备注

 

一个PathGradientBrush对象维护一个变换矩阵,可以存储任何仿射变换.当你用路径渐变画笔填充的区域,GDI+变换画笔的边界路径根据刷的变换矩阵,然后填充的转化路径的内部.转化的路径只存在在渲染；存储在PathGradientBrush物体边界的路径不改变.

 

引用文件

 

CGpBrush.inc (include CGdiPlus.inc)

 

示例

 

' ========================================================================================

' The following example creates a PathGradientBrush object based on an array of three points.

' The PathGradientBrush.ScaleTransform and PathGradientBrush.TranslateTransform methods set

' the elements of the brush's transformation matrix so that the matrix represents a composite

' transformation (first scale, then translate). That composite transformation applies to

' the brush's boundary path, so the call to FillRectangle fills the interior of a triangle

' that is the result of scaling and translating the boundary path. The code calls the

' PathGradientBrush.GetTransform method of the PathGradientBrush object to obtain the brush's

' transformation matrix and then calls the GetElements method of the retrieved Matrix object

' to fill an array with the matrix elements.

' ========================================================================================

SUB Example_GetTransform (BYVAL hdc AS HDC)

 

  ' // Create a graphics object from the window device context

  DIM graphics AS CGpGraphics = hdc

  ' // Get the DPI scaling ratio

  DIM rxRatio AS SINGLE = graphics.GetDpiX / 96

  DIM ryRatio AS SINGLE = graphics.GetDpiY / 96

  ' // Set the scale transform

  graphics.ScaleTransform(rxRatio, ryRatio)

 

  DIM points(0 TO 2) AS GpPoint = {GDIP_POINT(0, 0), GDIP_POINT(50, 0), GDIP_POINT(50, 50)}

  DIM pthGrBrush AS CGpPathGradientBrush = CGpPathGradientBrush(@points(0), 3)

 

  pthGrBrush.ScaleTransform(3.0, 1.0)

  pthGrBrush.TranslateTransform(10.0, 30.0, MatrixOrderAppend)

 

  graphics.FillRectangle(@pthGrBrush, 0, 0, 200, 200)

 

  ' // Obtain information about the path gradient brush.

  DIM matrix AS CGpMatrix

  DIM elements(0 TO 5) AS SINGLE

 

  pthGrBrush.GetTransform(@matrix)

  matrix.GetElements(@elements(0))

 

  FOR j AS LONG = 0 TO 5

     ' // Inspect or use the value in elements(j)

  NEXT

 

END SUB

' ========================================================================================