Overriding Styles, Inks, and Transforms (IM: XG)

Inside Macintosh: QuickDraw GX Graphics /: Chapter 6 - Picture Shapes / About Picture Shapes

Overriding Styles, Inks, and Transforms
QuickDraw GX allows you to specify an overriding style, ink, or transform object for any item in a picture. If an item has an overriding style, ink, or transform object, QuickDraw GX uses the information in the overriding object rather than the information in the original style, ink, or transform when drawing that item of the picture shape.
Figure 6-5 shows the picture from Figure 6-4 with overriding information added. In this figure, the first picture item has an overriding ink, which specifies a dark gray color. The second picture item has an overriding style, which specifies a pattern.
Figure 6-5 A picture shape with overrides

When QuickDraw GX draws the picture represented in Figure 6-5, it draws the first picture item using the information in the overriding ink object, rather than the information in the ink object originally associated with the first item. Similarly, when it draws the second shape, it uses the information in the overriding style rather than the information in the original style.