Legacy Document

Inside Macintosh: Imaging With QuickDraw /

Chapter 3 - QuickDraw Drawing / QuickDraw Drawing Reference

Routines

Changing the Background Bit Pattern

Each graphics port has a background pattern that's used when an area is erased (such as by using the EraseRect, EraseRoundRect, EraseArc, ErasePoly, and EraseRgn procedures) and when pixels are scrolled out of an area (such as by using the ScrollRect procedure described in the chapter "Basic QuickDraw"). The background pattern is stored in the bkPat field of every basic graphics port. You can use the BackPat procedure to change the bit pattern used as the background color by the current graphics port (black and white or color).

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Subtopics

BackPat