描述

 

获取箭头帽的宽度.宽度是箭头底部端点之间的距离.

 

C++ Syntax

 

 

FreeBASIC 语法

 

 

参数

 

该方法没有参数.

 

返回值

 

此方法返回箭头帽的宽度.

 

引用文件

 

CGpLineCaps.inc (include CGdiPlus.inc)

 

示例

 

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

' The following example creates an AdjustableArrowCap object, myArrow, and sets the width

' of the cap to 5 pixels. Next, the code creates a Pen object, assigns myArrow as the

' ending line cap for this Pen object, and draws a capped line. The code obtains the width

' using IGdipAdjustableArrowCap.GetWidth and sets the height equal to the width. The code then

' draws another capped line with the new cap.

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

SUB Example_GetWidth (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

  ' // Set the scale transform

  graphics.ScaleTransform(rxRatio, rxRatio)

 

  ' // Create an AdjustableArrowCap with a height of 10 pixels.

  DIM myArrow AS CGpAdjustableArrowCap = CGpAdjustableArrowCap(10, 5, CTRUE)

  ' // Adjust to DPI by setting the scale width

  myArrow.SetWidthScale(rxRatio)

 

  ' // Create a Pen, and assign myArrow as the end cap

  DIM arrowPen AS CGpPen = GDIP_ARGB(255, 0, 0, 0)

  arrowPen.SetCustomEndCap(@myArrow)

 

  ' // Get the width of the arrow

  DIM nWidth AS SINGLE = myArrow.GetWidth

 

  ' // Draw a line using arrowPen

  graphics.DrawLine(@arrowPen, 0, 0, 100, 100)

 

  ' // Set height equal to width and draw another line

  myArrow.SetHeight(nWidth)

  arrowPen.SetCustomEndCap(@myArrow)

  graphics.DrawLine(@arrowPen, 0, 40, 100, 140)

 

END SUB

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