描述

 

设置刻度宽度的值.这是一个规模的自定义线帽相对于笔的宽度用来画线.对1.0默认值不规模的线帽.

 

C++ Syntax

 

 

FreeBASIC 语法

 

 

参数

 

widthScale

 

[in]简单精度数指定的比例因子,将用于扩展线宽度.

 

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.

 

引用文件

 

CGpLineCaps.inc (include CGdiPlus.inc)

 

示例

 

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

' The following example creates a CustomLineCap object and sets the width scale. It then

' gets the width scale, assigns the custom cap to a Pen object, and draws a line.

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

SUB Example_SetWidthScale (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)

 

  ' // Set the width scale for custCap.

  custCap.SetWidthScale(3)

 

  ' // Assign custCap to a Pen object and draw a line.

  DIM widthScalePen AS CGpPen = CGpPen(GDIP_ARGB(255, 180, 0, 180), 1.7)

  widthScalePen.SetCustomEndCap(@custCap)

  graphics.DrawLine(@widthScalePen, 0, 0, 200, 200)

 

END SUB

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