Inside Macintosh: QuickDraw GX Graphics /

Chapter 4 - Geometric Operations / Geometric Operations Reference

Functions

Determining and Reversing Contour Direction

The contours of geometric shapes have a contour direction: clockwise or contourclockwise. The following factors determine the contour direction of a contour:

• the order and position of the geometric points that make up the contour
• the contour's relative position to other contours in the shape if the shape has multiple contours

For a discussion of geometric points, see Chapter 2, "Geometric Shapes," in this book.

The GXGetShapeDirection function allows you to determine the contour direction of a specified contour of a shape.

The GXReverseShape function allows you to reverse the order of the geometric points that define a contour and therefore reverse the contour's direction.

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Subtopics

GXGetShapeDirection

GXReverseShape

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