描述

 

创建具有指定高度和宽度的可调节箭头线帽.箭线帽可以填充或nonfilled.中间插入默认为零.

 

C++ Syntax

 

 

FreeBASIC 语法

 

 

参数

 

nHeight

 

[in]单位长度,从基地到点箭头.

 

nWidth

 

[in]距离,单位,对箭的基础之间的角落.

 

IsFilled

 

[in]布尔值,指定是否填充的箭头.默认值是TRUE.

 

备注

 

中间插图是基数中点向顶点移动的单位数.中间插入零结果没有移位？底座为直线,使箭头呈三角形.一个正（大于零）中间的结果,在一个移位的指定数量的单位朝向顶点？该基地是一个箭头形状的指向点,给箭头帽型.一个负（小于零）中间的结果在一个移位指定数量的单位远离顶点？该基地成为箭头形状,指出从顶点,使箭头要么菱形形状（如果中间插入的绝对值等于高度）或扭曲的钻石形状.如果中间插图等于或大于箭头帽的高度,则帽不会全部出现.中间箭头的值仅在箭头盖被填充时影响箭头帽.中间插入默认值为零的时候,AdjustableArrowCap对象构造.

 

引用文件

 

CGpLineCaps.inc (include CGdiPlus.inc)

 

示例

 

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

' The following example creates two AdjustableArrowCap objects, arrowCapStart and

' arrowCapEnd, and sets the fill mode to TRUE. The code then creates a Pen object and

' assigns arrowCapStart as the starting line cap for this Pen object and arrowCapEnd as

' the ending line cap. Next, draws a line.

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

SUB Example_CreateAdjustableArrowCap (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 that is filled

  DIM arrowCapStart AS CGpAdjustableArrowCap = CGpAdjustableArrowCap(10, 10, CTRUE)

  ' // Adjust to DPI by setting the scale width

  arrowCapStart.SetWidthScale(rxRatio)

 

  ' // Create an AdjustableArrowCap that is not filled

  DIM arrowCapEnd AS CGpAdjustableArrowCap = CGpAdjustableArrowCap(15, 15, FALSE)

  ' // Adjust to DPI by setting the scale width

  arrowCapEnd.SetWidthScale(rxRatio)

 

  ' // Create a Pen

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

 

  ' // Assign arrowStart as the start cap

  arrowPen.SetCustomStartCap(@arrowCapStart)

 

  ' // Assign arrowEnd as the end cap

  arrowPen.SetCustomEndCap(@arrowCapEnd)

 

  ' // Draw a line using arrowPen

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

 

END SUB

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