The header files relevant to creating and drawing patterns are

• CGPattern.h, which contains the definitions and prototypes needed for creating CGPattern objects.

• CGColor.h, which contains the functions to create the pattern color space and CGColor objects from patterns.

• CGContext.h, which contains the functions to set a pattern as the stroke or fill color and for setting the pattern phase.

The header files relevant to creating and drawing shadings are

• CGFunction.h, which contains the definitions and prototypes needed for creating CGFunction objects.

• CGShading.h, which contains the definitions and prototypes needed for creating CGShading objects.

• CGContext.h, which contains the functions to draw a shading to a context.

The header file relevant to setting the context shadow parameter and for beginning and ending a transparency layer is

• CGContext.h

The relevant reference information from the ADC Reference Library is

• CGPattern Reference

• CGColor Reference

• CGContext Reference

• CGFunction Reference

• CGShading Reference