Legacy Document

Inside Macintosh: Imaging With QuickDraw /

Chapter 3 - QuickDraw Drawing / QuickDraw Drawing Reference

Routines / Scaling and Mapping Points, Rectangles, Polygons, and Regions

MapRect

To map and scale a rectangle within one rectangle to another rectangle, use the MapRect procedure.

PROCEDURE MapRect (VAR r:\xDDRect; srcRect,dstRect:\xDDRect);

r

Upon input, the rectangle to map; upon completion, the mapped rectangle.

srcRect

The rectangle containing the rectangle to map.

dstRect

The rectangle in which the new rectangle will be mapped.

DESCRIPTION

The MapRect procedure takes a rectangle within one rectangle and maps and scales it to another rectangle. In the r parameter, you specify a rectangle that lies within the rectangle that you specify in the srcRect parameter. By calling the MapPt procedure to map the upper-left and lower-right corners of the rectangle in the r parameter, MapRect maps and scales it to the rectangle that you specify in the dstRect parameter. The MapRect procedure returns the newly mapped rectangle in the r parameter.