Source/System/NodeCores/Drawables/Nurbs/Internal/OSGBSplineBasisFunction.h

   1 /*---------------------------------------------------------------------------*\
   2  *                           OpenSG NURBS Library                            *
   3  *                                                                           *
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   5  * Copyright (C) 2001-2006 by the University of Bonn, Computer Graphics Group*
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   7  *                         http://cg.cs.uni-bonn.de/                         *
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  12 /*---------------------------------------------------------------------------*\
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  15  * This library is free software; you can redistribute it and/or modify it   *
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  17  * by the Free Software Foundation, version 2.                               *
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  19  * This library is distributed in the hope that it will be useful, but       *
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  36  *                                                                           *
  37 \*---------------------------------------------------------------------------*/
  38 #ifndef _OSG_BSPLINEBASISFUNCTION_H_
  39 #define _OSG_BSPLINEBASISFUNCTION_H_
  40 #ifdef __sgi
  41 #pragma once
  42 #endif
  43
  44 #include "OSGDrawableDef.h"
  45 #include "OSGConfig.h"
  46
  47
  48 #include "OSGdctptypes.h"
  49 #include <fstream>
  50 #include <string>
  51 #include <iomanip>
  52
  53 OSG_BEGIN_NAMESPACE
  54
  55 class OSG_DRAWABLE_DLLMAPPING BSplineBasisFunction
  56 {
  57
  58   public:
  59     inline  BSplineBasisFunction(void); //sets invalid knots, you must set them later
  60     inline ~BSplineBasisFunction(void);
  61
  62     //setup methods
  63     int setKnotVector(const DCTPdvector &k); //sets knot vector, preventing its increasing feature
  64
  65     //query methods
  66     inline DCTPdvector& getKnotVector(void);
  67
  68     void getParameterInterval(double &minpar, double &maxpar); //returns minimal and maximal parameter value
  69
  70     //I/O support - FIXME: read( char *fname ) outta be supported , etc
  71     int read(std::istream &infile);
  72     int write(std::ostream &outfile);
  73
  74     //some REAL funcionality
  75     //returns < 0 on error, otherwise the (original) span index into which the knot is inserted
  76     int    insertKnot(double k); //insert a new knot vector at it's correct point
  77     double compute(double u, int i, int p); //returns value at u
  78     int    computeAllNonzero(double u, int p, double *&rpd_n); // computes all nonzero basis functions at u
  79     int    computeDersBasisFuns(double dU, int iP, double **&rppdDers, int iDepth); // computes all nonzero derivates at u
  80
  81   protected:
  82     int CheckKnotPoints(const DCTPdvector &k);
  83     int findSpan(double &u); //gives the knotspan u is in
  84     DCTPdvector knots; //the knot vector, see dctptypes.h
  85 //file format constants
  86     static const char ff_const_1[];
  87     static const char ff_const_2[];
  88     static const char ff_const_3[];
  89 };
  90
  91 OSG_END_NAMESPACE
  92
  93 #include "OSGBSplineBasisFunction.inl"
  94
  95 #endif /* _OSG_BSPLINEBASISFUNCTION_H_ */