描述

 

获取基帽与线开始的距离.

 

C++ Syntax

 

 

FreeBASIC 语法

 

 

参数

 

该方法没有参数.

 

返回值

 

底座插入用于将底座盖与线的起点分开.0的值使基帽和线接触.大于0的值插入线帽和线开始之间的空间（单位）.

 

引用文件

 

CGpLineCaps.inc (include CGdiPlus.inc)

 

示例

 

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

' The following example creates a CustomLineCap object, gets the base inset of the cap,

' and then creates a second CustomLineCap object that uses the same base inset.

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

SUB Example_GetBaseInset (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 object, and add two lines to it

  DIM pts(0 TO 2) AS GpPoint = {GDIP_POINT(-15, -15), GDIP_POINT(0, 0), GDIP_POINT(15, -15)}

'#ifdef __FB_64BIT__

'   DIM pts(0 TO 2) AS GpPoint = {(-15, -15), (0, 0), (15, -15)}

'#else

'   ' // With the 32-bit compiler, the above syntax can't be used because a mess in the

'   ' // FB headers for GdiPlus: GpPoint is defined as Point in 64 bit and as Point_ in 32 bit.

'   DIM pts(0 TO 2) AS GpPoint

'   pts(0).x = -15 : pts(0).y = -15 : pts(2).x = 15: pts(2).y = -15

'#endif

 

  DIM capPath AS CGpGraphicsPath = FillModeAlternate

  capPath.AddLines(@pts(0), 3)

 

  ' // Create a CustomLineCap object, and set its base cap to LineCapRound

  DIM custCap AS CGpCustomLineCap = CGpCustomLineCap(NULL, @capPath, LineCapRound, 5)

 

' // Get the base inset of custCap

  DIM baseInset AS SINGLE = custCap.GetBaseInset

 

' // Create a second CustomLineCap object with the same base inset as the first.

  DIM insetCap AS CGpCustomLineCap = CGpCustomLineCap(NULL, @capPath, LineCapRound, baseInset)

 

' // Create a Pen object and assign insetCap as the custom end cap. Then draw a line.

  DIM pen AS CGpPen = CGpPen(GDIP_ARGB(255, 0, 0, 255), 5)

  pen.SetCustomEndCap(@insetCap)

  graphics.DrawLine(@pen, 10, 10, 200, 200)

 

END SUB

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