Source/System/NodeCores/Drawables/Nurbs/Internal/OSGBSplineCurve2D.h

   1 /*---------------------------------------------------------------------------*\
   2  *                           OpenSG NURBS Library                            *
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   5  * Copyright (C) 2001-2006 by the University of Bonn, Computer Graphics Group*
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  12 /*---------------------------------------------------------------------------*\
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  17  * by the Free Software Foundation, version 2.                               *
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  37 \*---------------------------------------------------------------------------*/
  38 #ifndef _OSG_BSPLINECURVE2D_H_
  39 #define _OSG_BSPLINECURVE2D_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 "OSGBSplineBasisFunction.h"
  50 #include "OSGBezierCurve2D.h"
  51
  52 OSG_BEGIN_NAMESPACE
  53
  54 class OSG_DRAWABLE_DLLMAPPING BSplineCurve2D
  55 {
  56   protected:
  57     DCTPVec3dvector      control_points; //control points of the curve
  58     int                  dimension; //dimension of the B-spline (degree)
  59     BSplineBasisFunction basis_function; //placeholder for the knots & facility to easily compute 'em
  60
  61     //file format constants
  62     static const char ff_const_1[];
  63     static const char ff_const_2[];
  64     static const char ff_const_3[];
  65     static const char ff_const_4[];
  66
  67     int CheckKnotPoints(const DCTPdvector& knots, int dim); //check whether knots has a right format
  68
  69     // delete a knot which is on a 'bezier' curve, i.e. [0 0 0 0 1 1 1 1 2 2 2 2 3 3 3 3] -> [0 0 0 0 1 1 1 2 2 2 3 3 3 3]
  70     // must have a multiplicity of (at least) dimension + 1, and its associated control point also must have a multiplicity of (at least) 2.
  71     int deleteBezierKnot(double k);
  72
  73
  74   public:
  75     inline  BSplineCurve2D(void);
  76     inline ~BSplineCurve2D(void);
  77
  78     //setup functions
  79     // FIXME: the setup interface is very rigid, maybe it should allow knot & dimension setting alone, eg. to resize dimension, etc
  80     int  setKnotsAndDimension(const DCTPdvector& knots, int dim); //ok, acts like its name says
  81     void setControlPointVector(const DCTPVec3dvector &cps); //set control point vector
  82
  83     //query functions
  84     inline DCTPdvector&     getKnotVector        (void); //return knot points of basis functions
  85     inline DCTPVec3dvector& getControlPointVector(void);
  86     inline int              getDimension         (void);
  87
  88     void getParameterInterval(double &minpar, double &maxpar); //returns minimal and maximal parameter value
  89
  90     //I/O support - FIXME: read( char *fname ) outta be supported , etc
  91     int read(std::istream &infile);
  92     int write(std::ostream &outfile);
  93
  94     //some REAL functionality
  95     Vec2d compute(double t, int &error); // compute curve at parameter value t
  96     int   insertKnot(double k); // insert a new knot (recalculates control points and knotvector)
  97
  98     // convert curve into Bezier form.
  99     int makeBezier(bezier2dvector &beziers, DCTPdvector &pars);
 100 };
 101
 102 OSG_END_NAMESPACE
 103
 104 #include "OSGBSplineCurve2D.inl"
 105
 106 #endif //BSplineCurve2D.h