描述

 

获取为此路径渐变画笔的边界路径指定的颜色数.

 

C++ Syntax

 

 

FreeBASIC 语法

 

 

参数

 

该方法没有参数.

 

返回值

 

此方法返回为该路径渐变刷的边界路径指定的颜色数.

 

引用文件

 

CGpBrush.inc (include CGdiPlus.inc)

 

示例

 

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

' The following example creates a PathGradientBrush object based on a triangular path that

' is defined by an array of three points. The code calls the PathGradientBrush.SetSurroundColors

' method of the PathGradientBrush object to specify a color for each of the points that

' define the triangle. The PathGradientBrush.GetSurroundColorCount method determines the

' current number of surround colors (the colors specified for the brush's boundary path).

' Next, the code allocates a buffer large enough to receive the array of surround colors

' and calls PathGradientBrush.GetSurroundColors to fill that buffer. Finally the code fills

' a small square with each of the brush's surround colors.

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

SUB Example_GetSurroundColors (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(100, 0), GDIP_POINT(200, 200), GDIP_POINT(0, 200)}

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

 

  DIM nCount AS LONG = 3

  DIM colors(0 TO 2) AS ARGB = {GDIP_ARGB(255, 255, 0, 0), GDIP_ARGB(255, 0, 0, 255), GDIP_ARGB(255, 0, 255, 255)}

  pthGrBrush.SetSurroundColors(@colors(0), @nCount)

 

  ' // Obtain information about the path gradient brush.

  DIM colorCount AS LONG = pthGrBrush.GetSurroundColorCount

  DIM rgColors(colorCount - 1) AS ARGB

  pthGrBrush.GetSurroundColors(@rgColors(0), @colorCount)

 

  ' // Fill a small square with each of the surround colors.

  DIM solidBrush AS CGpSolidBrush = GDIP_ARGB(255, 255, 255, 255)

  FOR j AS LONG = 0 TO colorCount - 1

     solidBrush.SetColor(rgColors(j))

     graphics.FillRectangle(@solidBrush, 15 * j, 0, 10, 10)

  NEXT

 

END SUB

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