描述

 

得到的混合因子的数量目前为这个LinearGradientBrush对象.

 

C++ Syntax

 

 

FreeBASIC 语法

 

 

参数

 

该方法没有参数.

 

返回值

 

此方法返回的混合因子的数量目前为这个LinearGradientBrush对象.如果没有自定义的共混物已被使用LinearGradientBrush.SetBlend,或者无效的位置传给了LinearGradientBrush.SetBlend,然后LinearGradientBrush.GetBlend返回1.

 

引用文件

 

CGpBrush.inc (include CGdiPlus.inc)

 

示例

 

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

' The following example creates a linear gradient brush, sets its blend, and uses the brush

' to fill a rectangle. The code then gets the blend. The blend factors and positions can

' then be inspected or used in some way.

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

SUB Example_GetBlend (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 factors(0 TO 3) AS SINGLE = {0.0, 0.4, 0.6, 1.0}

  DIM positions(0 TO 3) AS SINGLE = {0.0, 0.2, 0.8, 1.0}

 

  DIM pt1 AS GpPoint = GDIP_POINT(0, 0)

  DIM pt2 AS GpPoint = GDIP_POINT(100, 0)

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

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

  linGrBrush.SetBlend(@factors(0), @positions(0), 4)

 

  ' // Use the linear gradient brush to fill a rectangle.

  graphics.FillRectangle(@linGrBrush, 0, 0, 100, 50)

 

  ' // Obtain information about the linear gradient brush.

  DIM blendCount AS LONG = linGrBrush.GetBlendCount

  DIM rgFactors(blendCount - 1) AS SINGLE

  DIM rgPositions(blendCount - 1) AS SINGLE

 

  linGrBrush.GetBlend(@rgFactors(0), @rgPositions(0), blendCount)

 

  FOR j AS LONG = 0 TO blendCount - 1

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

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

     OutputDebugString STR(rgFactors(j)) & STR(rgPositions(j))

  NEXT

 

END SUB

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