Font Height in .NET framework

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Font Height
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While we're on the subject of font height, it turns out that there are a lot of ways to measure the height of a font The Font class provides not only the GetHeight method[4] but also the Size property, which is the base size provided in the units passed to the Font object's constructor (the GraphicsUnit value specified at construction time is available via the Font's Unit property) As I mentioned, the height of a font is determined from the base size The height of the font is further broken down into three parts called cell ascent, cell descent, and leading (so named because typesetting used to be done with lead) Two of these three measures are available in design units from the FontFamily class (available via the Font's FontFamily property) and are shown in Figure 52 Together, these three values make up the line spacing, which is also provided as a property on the FontFamily and is used to calculate the font's height and leading (leading isn't available directly)
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The Font also provides a Height property, but it should be avoided in favor of the GetHeight method The GetHeight method scales to a specified Graphics object, whereas the Height property scales only to the current video adapter's dpi, making it pretty worthless for anything except the nontransformed video adapter
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Figure 52 The Parts of a Font Family's Height
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The line spacing is expressed in design units but is used at run time to determine the result of calling FontGetHeight The magic of the conversion between design units and pixels is managed by one more measure available from the FontFamily class: the em height The em height is a logical value but is equivalent to the font's size in points, so scaling between design units and pixels is performed using the proportion between the font's size and the font family's em height For example, the scaling factor between Arial's em height (2,048) and its 12-point pixel height (16 at 96 dpi) is 128 Dividing Arial's line spacing (2,355) by 128 yields 1839844, which is the same as the result of calling GetHeight on 12-point Arial at 96 dpi Table 51 shows the various measures of font and font family height
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Table 51 Font and FontFamily Sizes (Sample Font Is Arial 12 Point at 96 dpi)
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Measure FontFamilyGetEmHeight FontFamilyGetCellAscent Units Design Units Design Units Example 2,048 1,854 434 2,355 Description Base size, equivalent to Size Height above base line Height below base line CellAscent + CellDescent + Leading, normally about 115% of EmHeight Extra space below bottom of CellDescent for readability, not exposed by any property Base size, equivalent to EmHeight
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FontFamilyGetCellDescent Design Units FontFamilyGetLineSpacing Design Units
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Leading
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Design Units
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GraphicsUnit passed 16 pixels to Font ctor (defaults to Point) Points Pixels
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FontSizeInPoints FontGetHeight
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12 points Base size in points, equivalent to Size and EmHeight 1839844 Equivalent to LineSpacing scaled to either Graphics object or dpi
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FontHeight
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Pixels
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Equivalent to LineSpacing scaled to system dpi and rounded to next-highest integer value Used to convert design units to physical or logical values for rendering
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Strings
Of course, deciding on a font is only half the fun The real action is drawing strings after the font's been picked For that, you use the DrawString method of the Graphics object: using( Font font = new Font("Arial", 12) ) { // This will wrap at new line characters gDrawString("line 1\nline 2", font, BrushesBlack, 10, 10); } The DrawString method takes, at a minimum, a string, a font, a brush to fill in the font characters, and a point DrawString starts the drawing at the point and keeps going until it hits the edges of the region in the Graphics object This includes translating new line characters as appropriate but does not include wrapping at word boundaries To get the wrapping, you specify a layout rectangle: using( Font font = new Font("Arial", 12) ) { // This will automatically wrap long lines and // it will wrap at new line characters gDrawString("a long string", font, BrushesBlack, thisClientRectangle); }