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Controlling How Text Looks

Some of the settings in the graphics state that apply to painting paths also apply to text drawing. Stroke color and fill color are two such attributes. (See “Paths”) for other attributes and operations that affect text rendering.)

Several text drawing attributes apply only to text. You can set the values of these attributes using the Quartz functions listed in Table 17-1. Notice that the function CGContextSelectFont sets both the font and the font size. It also sets the text encoding. “Drawing Text” discusses the difference between using CGContextSelectFont and CGContextSetFont.

The text matrix is a transform that operates similarly to the current transformation matrix (CTM), but only on text. You can apply transforms to the text matrix, using any of the affine transform functions to build as complex a transform as you’d like. When you draw the text, Quartz uses the text matrix you supply along with the CTM. When you draw anything other than text, Quartz uses the CTM and not the text matrix.

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