Panda3D
 All Classes Functions Variables Enumerations
nurbsBasisVector.h
00001 // Filename: nurbsBasisVector.h
00002 // Created by:  drose (03Dec02)
00003 //
00004 ////////////////////////////////////////////////////////////////////
00005 //
00006 // PANDA 3D SOFTWARE
00007 // Copyright (c) Carnegie Mellon University.  All rights reserved.
00008 //
00009 // All use of this software is subject to the terms of the revised BSD
00010 // license.  You should have received a copy of this license along
00011 // with this source code in a file named "LICENSE."
00012 //
00013 ////////////////////////////////////////////////////////////////////
00014 
00015 #ifndef NURBSBASISVECTOR_H
00016 #define NURBSBASISVECTOR_H
00017 
00018 #include "pandabase.h"
00019 #include "luse.h"
00020 #include "pvector.h"
00021 #include "pmap.h"
00022 
00023 class NurbsVertex;
00024 
00025 ////////////////////////////////////////////////////////////////////
00026 //       Class : NurbsBasisVector
00027 // Description : This encapsulates a series of matrices that are used
00028 //               to represent the sequential segments of a
00029 //               NurbsCurveEvaluator.
00030 //
00031 //               This is not related to NurbsCurve, CubicCurveseg or
00032 //               any of the ParametricCurve-derived objects in this
00033 //               module.  It is a completely parallel implementation
00034 //               of NURBS curves, and will probably eventually replace
00035 //               the whole ParametricCurve class hierarchy.
00036 ////////////////////////////////////////////////////////////////////
00037 class EXPCL_PANDA_PARAMETRICS NurbsBasisVector {
00038 public:
00039   INLINE NurbsBasisVector();
00040   INLINE ~NurbsBasisVector();
00041 
00042   INLINE int get_order() const;
00043 
00044   INLINE int get_num_segments() const;
00045   INLINE PN_stdfloat get_start_t() const;
00046   INLINE PN_stdfloat get_end_t() const;
00047 
00048   INLINE int get_vertex_index(int segment) const;
00049   INLINE PN_stdfloat get_from(int segment) const;
00050   INLINE PN_stdfloat get_to(int segment) const;
00051   INLINE const LMatrix4 &get_basis(int segment) const;
00052   INLINE PN_stdfloat scale_t(int segment, PN_stdfloat t) const;
00053 
00054   void clear(int order);
00055   void append_segment(int vertex_index, const PN_stdfloat knots[]);
00056 
00057   void transpose();
00058 
00059 private:
00060   static LVecBase4 nurbs_blending_function(int order, int i, int j, 
00061                                             const PN_stdfloat knots[]);
00062 
00063 private:
00064   int _order;
00065 
00066   class Segment {
00067   public:
00068     int _vertex_index;
00069     PN_stdfloat _from;
00070     PN_stdfloat _to;
00071     LMatrix4 _basis;
00072   };
00073 
00074   typedef epvector<Segment> Segments;
00075   Segments _segments;
00076 };
00077 
00078 #include "nurbsBasisVector.I"
00079 
00080 #endif
00081 
 All Classes Functions Variables Enumerations