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Master .NET's Text Tricks : Page 3

Learn how to use the Graphics object's methods to draw text in different fonts—clipped, wrapped, aligned, stretched, and rotated in all sorts of ways.


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Clipping and Wrapping Text
The StringFormat object's FormatFlags property controls how DrawString wraps and clips text within a formatting rectangle. Table 1 shows the FormatFlags values that you can use to control clipping and wrapping.

 
Figure 5. Clipping and Wrapping Text: The StringFormat object's FormatFlags property determines how text is wrapped and clipped.
Table 1. FormatFlags Values: The table lists the possible FormatFlags values and provides a brief description of the way each value affects text output.
Value Result
FitBlackBox Lines are wrapped normally. Lines that extend below the formatting rectangle are clipped—so they may be only partially drawn.
LineLimit Most lines are wrapped normally. If the text contains more lines than will fit, the final line is clipped on a character boundary so a partial word may be visible.
NoClip Lines are wrapped as usual and may continue below the bottom of the formatting rectangle.
NoWrap The text is not wrapped. Instead, the method clips any lines that extend beyond the edge of the formatting rectangle.

Figure 5 shows the effects of the FormatFlags values.

The StringFormat object's Trimming property also plays a role in how DrawString clips text. The property accepts a StringTrimming enumeration value. Table 2 lists the possible values of the StringTrimming enumeration.

 
Figure 6. Trimming Strings: Setting the StringFormat.Trimming property to EllipsisCharacter draws the text trimmed and adds an ellipsis at the end.
Table 2. StringTrimming Enumeration Values: The table lists the possible StringTrimming values and provides a brief description of the way each value affects text output.
Value Result
Character Text is trimmed after the last character that fits.
EllipsisCharacter Text is trimmed after the last character that fits and is then followed by an ellipsis.
EllipsisPath Text in the middle of the string is replaced with an ellipsis to make the string fit. This is particularly useful for file paths where you want to show the beginning and end of the path.
EllipsisWord Text is trimmed after the last word that fits and is then followed by an ellipsis.
None Text is not trimmed.
Word Text is trimmed after the last word that fits.

For example, the following code makes the StringFormat object clip the text after the last word that will fit and add an ellipsis at the end.

string_format.Trimming = StringTrimming.EllipsisWord

The example program Ellipses demonstrates each of the StringTrimming values. Figure 6 shows the sample program output with StringFormat.Trimming set to EllipsisCharacter.



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