41 lines
1.8 KiB
HTML
41 lines
1.8 KiB
HTML
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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
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<HTML>
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<HEAD>
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<TITLE>#define space osgGA</TITLE>
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<META NAME="GENERATOR" CONTENT="DOC++ 3.4.8">
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</HEAD>
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<BODY BGCOLOR="#ffffff">
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<H2>#define <A HREF="#DOC.DOCU">space osgGA</A></H2></H2><A NAME="DOC.DOCU"></A>
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<BLOCKQUOTE>
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<P>
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The 'GA' in osgGA stands for 'GUI Abstraction'; the osgGA namespace provides facilities to
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help developers write the glue to allow the osg to work with varying window systems.
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<P>As a cross-platform, window system-agnostic class library, the OpenSceneGraph
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has no direct ties to any given windowing environment. Viewers, however, must at
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some level interact with a window system - where Window system may refer to a windowing
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API, e.g. GLUT, Qt, FLTK, MFC, ...
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<P>There is much commonality in the implementation of Viewers for varying windowing
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environments. E.g. most Viewers will update a Camera position in response to a mouse
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event, and may request that a timer be started as a result of a model being 'spun'.
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<P>The purpose of the osgGA namespace is to centralise the common areas of this
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functionality. The viewer writer needs then only write a GUIEventAdapter, a
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GUIActionAdapter, and assemble a collection of GUIEventHandlers
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as appropriate for the viewer.
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<P>Events from the windowing environment are adpated, and then fed into the GUIEventHandlers.
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The GUIEventHandlers analyse and take action, and make requests of the windowing
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environemnt via the GUIActionAdapter. The viewer writer should then honour these
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requests, translating them into calls to the windowing API.
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</BLOCKQUOTE>
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<DL><DT><DD></DL><P><P><I><A HREF="index.html">Alphabetic index</A></I> <I><A HREF="HIER.html">Hierarchy of classes</A></I></P><HR>
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<BR>
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This page was generated with the help of <A HREF="http://docpp.sourceforge.net">DOC++</A>.
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</BODY>
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</HTML>
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