描述

 

设置此路径渐变画笔的混合形状.

 

C++ Syntax

 

 

FreeBASIC 语法

 

 

参数

 

focus

 

[in]单精度数指定中心的颜色会在其最高强度.这个数字必须在0到1的范围内.

 

scale

 

[in]简单精度数指定颜色,得到中心混合边界的颜色强度最大.这个数字必须在0到1的范围内.默认值是1.

 

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

 

默认情况下,当你从路径渐变的边界移动到中心点时,颜色会逐渐从边界颜色变为中心颜色.您可以自定义定位和混合的边界和中心的颜色通过调用PathGradientBrush.SetBlendTriangularShape method.

 

引用文件

 

CGpBrush.inc (include CGdiPlus.inc)

 

示例

 

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

' The following example creates a PathGradientBrush object based on an ellipse. The code

' calls the PathGradientBrush.SetBlendTriangularShape method of the PathGradientBrush object,

' passing a focus of 0.2 and a scale of 0.7. Then the code uses the path gradient brush to

' paint a rectangle that contains the ellipse.

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

SUB Example_SetBlendTriangularShape (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 path that consists of a single ellipse.

  DIM path AS CGpGraphicsPath

  path.AddEllipse(0, 0, 200, 100)

 

  ' // Use the path to construct a brush.

  DIM pthGrBrush AS CGpPathGradientBrush = @path

 

  ' // Set the color at the center of the path to blue.

  pthGrBrush.SetCenterColor(GDIP_ARGB(255, 0, 0, 255))

 

  ' // Set the color along the entire boundary of the path to aqua.

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

  DIM count AS LONG = 1

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

 

  pthGrBrush.SetBlendTriangularShape(0.2, 0.7)

 

  ' // The color is blue on the boundary and at the center.

  ' // At points that are 20 percent of the way from the boundary to the

  ' // center, the color is 70 percent red and 30 percent blue.

 

  graphics.FillRectangle(@pthGrBrush, 0, 0, 300, 300)

 

END SUB

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