Generic FunctionPackage: cgToCDocOverviewCGDocRelNotesFAQIndexPermutedIndex
Allegro CL version 8.2
Unrevised from 8.1 to 8.2.
8.1 version

graphics-context-p

Arguments: stream object

Returns t if object is a valid graphics-context for stream, and returns nil otherwise. Currently returns t for any windows-graphics stream with any graphics-context object, but in the future different kinds of stream may require different graphics-contexts. stream should be a cg-stream.

See copy-graphics-context (where all the information in a graphics-context object is described), make-graphics-context, set-graphics-context, and restoring-graphics-context.


Copyright (c) 1998-2016, Franz Inc. Oakland, CA., USA. All rights reserved.
This page was not revised from the 8.1 page.
Created 2010.1.21.

ToCDocOverviewCGDocRelNotesFAQIndexPermutedIndex
Allegro CL version 8.2
Unrevised from 8.1 to 8.2.
8.1 version