QuickTime 4 Reference

Geometry Space

QuickDraw GX starts the drawing process by using the values in a shape's geometry. Geometry space is the space within which the fundamental position and dimensions of a shape object are defined. The numerical values in a shape's geometry define the shape's dimensions in geometry space. Suppose, for example, that the geometry of a rectangle consists of the points (0.0, 0.0) and (180.0, 360.0), as shown in Figure 2 . In geometry space, the rectangle's origin is at (0.0, 0.0), its height is twice its width, and its area is 64,800.0 units square. No distance metric, such as points per inch, is defined for geometry space. Thus, the absolute size of a shape is undefined in geometry space.

Figure 2 A rectangle in geometry space