00001 /*
00002 File: Clipper.h
00003
00004 Function: Clips homogeneous coordinates to the display frustrum
00005 (x, y, z) E [-1, 1] x [-1, 1] x [0, 1]
00006
00007 The standard display pipeline is transform, clip, project,
00008 2D draw. The Clipper class should be passed post-transform
00009 homogeneous coordinates. It will in turn call ViewPoint()
00010 with clipped coordinates. You should override ViewPoint()
00011 to perform the homogeneous divide, map to display coords,
00012 and do the drawing.
00013
00014 Author: Andrew Willmott
00015
00016 Copyright: (c) 1998-2000, Andrew Willmott
00017 */
00018
00019
00020 #ifndef __Clipper__
00021 #define __Clipper__
00022
00023 #include "gcl/Geometry.h"
00024
00025 typedef GCLReal BdryCoords[6];
00026
00027 class Clipper
00028 {
00029 public:
00030 Clipper();
00031 Void ClipPoint(const HPoint &p, Bool draw);
00033 virtual Void ViewPoint(const HPoint &p, Bool draw) = 0;
00035 protected:
00036 HPoint lastP;
00037 Int lastOutcode;
00038 BdryCoords lastBC;
00039 };
00040
00041 #endif
