描述

 

得到该线性梯度刷的变换矩阵.

 

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LinearGradientBrush对象维护一个变换矩阵,可以存储任何仿射变换.当你使用一个线性渐变画笔填充的区域,GDI+变换画笔的边界线根据刷的变换矩阵,然后填充的区域.转化的边界只存在在渲染；没有转化的LinearGradientBrush对象存储的界限.

 

引用文件

 

CGpBrush.inc (include CGdiPlus.inc)

 

示例

 

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

' The following example creates a linear gradient brush and sets its transformation matrix.

' Next, the code gets the brush's transformation matrix and proceeds to inspect or use 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)

 

  ' // Create a linear gradient brush.

  DIM pt1 AS GpPoint = GDIP_POINT(0, 0)

  DIM pt2 AS GpPoint = GDIP_POINT(200, 0)

  DIM linGrBrush AS CGpLinearGradientBrush = CGpLinearGradientBrush(@pt1, @pt2, _

     GDIP_ARGB(255, 0, 0, 0), GDIP_ARGB(255, 0, 0, 255))

 

  DIM matrixSet AS CGpMatrix = CGpMatrix(0, 1, -1, 0, 0, 0)

 

  linGrBrush.SetTransform(@matrixSet)

 

  ' // Obtain information about the linear gradient brush.

  DIM matrixGet AS CGpMatrix

  DIM elements(0 TO 5) AS SINGLE

 

  linGrBrush.GetTransform(@matrixGet)

  matrixGet.GetElements(@elements(0))

 

  graphics.FillRectangle(@CGpSolidBrush(GDIP_ARGB(255, 0, 0, 0)), 0, 0, 20, 20)

 

  FOR j AS LONG = 0 TO 5

     ' // Inspect or use the value in elements[j].

     PRINT STR(elements(j))

  NEXT

 

END SUB

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