You can use the QuickDraw text routines to measure and draw text ranging in complexity from a single glyph to a line of justified text containing multiple languages and styles. In addition to measuring and drawing text, the QuickDraw text routines also help you to determine which characters to highlight and where to position the caret to mark the insertion point. These routines translate pixel locations into byte offsets and vice versa.
To understand the routines described in this document, it is helpful to be familiar with the other parts of QuickDraw. It is also helpful to be familiar with the Font Manager, because of the close relationship between QuickDraw and the Font Manager. To understand the tasks involved in text layout, you should also be acquainted with the Text Utilities and the Script Manager.