描述

 

在指定的Graphics对象的当前单位这个字体的行距.行间距是连续两行文本的基线之间的垂直距离.因此,行间距包括行之间的空白以及字符本身的高度.

 

C++ Syntax

 

 

FreeBASIC 语法

 

 

参数

 

pGraphics

 

[in]指向Graphics对象的单元和垂直分辨率是用于高度计算.

 

返回值

 

此方法返回此字体的行间距.

 

备注

 

如果字体单位设置为比其他任何UnitPixel,高度,以像素为单位,使用指定的Graphics对象的垂直分辨率计算.例如,假定字体单位为英寸,字体的大小0.3.也假设相应的字体,EM高度2048和线间距的2355.如果Graphics对象单位的Graphics对象UnitPixel和垂直分辨率为96点每英寸的高度计算如下：

2355*(0.3/2048)*96 = 33.1171875

继续同样的例子,假设的Graphics对象单位以外的其他UnitPixel,说UnitMillimeter.然后（使用1英寸= 25.4毫米）毫米的高度,计算如下：

2355*(0.3/2048)25.4 = 8.762256

 

引用文件

 

CGpFont.inc (include CGdiPlus.inc)

 

示例

 

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

' The following example creates a Font object, retrieves the height of the Font object, and

' uses the height to position two lines of text, with the second line directly below the first.

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

SUB Example_GetHeight (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 Font object.

  DIM font AS CGpFont = CGpFont("Arial", AfxPointsToPixelsX(16) / rxRatio)

 

  ' // Draw text with myFont.

  DIM solidbrush_1 AS CGpSolidBrush = GDIP_ARGB(255, 0, 0, 0)

  DIM wszText AS WSTRING * 260 = "The first line of text"

  graphics.DrawString(@wszText, -1, @font, 0, 0, @solidbrush_1)

 

  ' // Get the height of myFont.

  DIM height AS SINGLE = font.GetHeight(@graphics)

 

  ' // Draw text immediately below the first line of text

  DIM solidbrush_2 AS CGpSolidBrush = GDIP_ARGB(255, 255, 0, 0)

  DIM wszText2 AS WSTRING * 260 = "The second line of text"

  graphics.DrawString(@wszText2, -1, @font, 0, height, @solidbrush_2)

 

END SUB

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