描述

 

获取此路径渐变画笔的焦点刻度.

 

C++ Syntax

 

 

FreeBASIC 语法

 

 

参数

 

xScale

 

[out]指针到一个简单的精密接收焦点刻度值.

 

yxScale

 

[out]指针到一个简单的精度受到Y焦点刻度值.

 

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,路径渐变的中心颜色位于中心点.通过调用PathGradientBrush.SetFocusScales,你可以指定中心颜色要沿着一条路径,围绕的中心点.例如,假设边界路径是三角形,中心点位于三角形的中心位置.同时假定边界颜色为红色,中心颜色为蓝色.如果你设置的重点尺度(0.2, 0.2),颜色是沿一个小三角,围绕中心点的边蓝.小三角是主要的边界路径在y方向的因素在x方向和0.2 0.2缩放.当你画的路径渐变刷,颜色将逐渐改变从红色到蓝色,当你从大三角的边界移动到小三角形的边界.小三角区内充满蓝色.

 

引用文件

 

CGpBrush.inc (include CGdiPlus.inc)

 

示例

 

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

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

' The code sets the focus scales of the path gradient brush to (0.2, 0.2) and then uses

' the path gradient brush to fill an area that contains the triangular path. Finally, the

' code calls the PathGradientBrush.GetFocusScales method of the PathGradientBrush object

' to obtain the values of the x focus scale and the y focus scale.

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

SUB Example_GetFocusScales (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)}

 

  ' // No GraphicsPath object is created. The PathGradientBrush

  ' // object is constructed directly from the array of points.

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

 

  DIM colors(0 TO 1) AS ARGB = {GDIP_ARGB(255, 255, 0, 0), GDIP_ARGB(255, 0, 0, 255)}

 

  ' // red at the boundary of the outer triangle

  ' // blue at the boundary of the inner triangle

  DIM relativePositions(0 TO 1) AS SINGLE = {0.0, 1.0}

  pthGrBrush.SetInterpolationColors(@colors(0), @relativePositions(0), 2)

 

  ' // The inner triangle is formed by scaling the outer triangle

  ' // about its centroid. The scaling factor is 0.2 in both the x and y directions.

  pthGrBrush.SetFocusScales(0.2, 0.2)

 

  ' // Fill a rectangle that is larger than the triangle

  ' // specified in the Point array. The portion of the

  ' // rectangle outside the triangle will not be painted.

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

 

  ' // Obtain information about the path gradient brush.

  DIM xScale AS SINGLE = 0.0

  DIM yScale AS SINGLE = 0.0

  pthGrBrush.GetFocusScales(@xScale, @yScale)

 

  ' // The value of xScale is now 0.2.

  ' // The value of yScale is now 0.2.

 

END SUB

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