# tricoef.h

    00001 //
    00002 // tricoef.h
    00003 //
    00004 // Copyright (C) 1996 Limit Point Systems, Inc.
    00005 //
    00006 // Author: Curtis Janssen <cljanss@limitpt.com>
    00007 // Maintainer: LPS
    00008 //
    00009 // This file is part of the SC Toolkit.
    00010 //
    00011 // The SC Toolkit is free software; you can redistribute it and/or modify
    00012 // it under the terms of the GNU Library General Public License as published by
    00013 // the Free Software Foundation; either version 2, or (at your option)
    00014 // any later version.
    00015 //
    00016 // The SC Toolkit is distributed in the hope that it will be useful,
    00017 // but WITHOUT ANY WARRANTY; without even the implied warranty of
    00018 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    00019 // GNU Library General Public License for more details.
    00020 //
    00021 // You should have received a copy of the GNU Library General Public License
    00022 // along with the SC Toolkit; see the file COPYING.LIB.  If not, write to
    00023 // the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
    00024 //
    00025 // The U.S. Government is granted a limited license as per AL 91-7.
    00026 //
    00027
    00028 #ifndef _math_isosurf_tricoef_h
    00029 #define _math_isosurf_tricoef_h
    00030
    00031 #ifdef __GNUC__
    00032 #pragma interface
    00033 #endif
    00034
    00035 #include <util/ref/ref.h>
    00036
    00037 namespace sc {
    00038
    00039 class TriInterpCoefKey {
    00040   private:
    00041     int order_;
    00042     double L2_;
    00043     double L3_;
    00044   public:
    00045     TriInterpCoefKey(int order, double L2, double L3):
    00046       order_(order), L2_(L2), L3_(L3) {}
    00047     int order() const { return order_; }
    00048     double L1() const { return 1.0 - L2_ - L3_; }
    00049     double L2() const { return L2_; }
    00050     double L3() const { return L3_; }
    00051     int cmp(const TriInterpCoefKey&t) const {
    00052         if (order_ < t.order_) return -1;
    00053         if (order_ > t.order_) return 1;
    00054         if (L2_ < t.L2_) return -1;
    00055         if (L2_ > t.L2_) return 1;
    00056         if (L3_ < t.L3_) return -1;
    00057         if (L3_ > t.L3_) return 1;
    00058         return 0;
    00059       }
    00060 };
    00061
    00062 #define TriInterpCoefKeyEQ(k1,k2) ((k1).cmp(k2)==0)
    00063 #define TriInterpCoefKeyCMP(k1,k2) ((k1).cmp(k2))
    00064
    00065 class TriInterpCoef: public RefCount {
    00066     double *coef_;
    00067     double *rderiv_;
    00068     double *sderiv_;
    00069   public:
    00070     TriInterpCoef(const TriInterpCoefKey& key);
    00071     ~TriInterpCoef();
    00072     double& coef(int i, int j, int k) {return coef_[ijk_to_index(i,j,k)];}
    00073     double& rderiv(int i, int j, int k) {return rderiv_[ijk_to_index(i,j,k)];}
    00074     double& sderiv(int i, int j, int k) {return sderiv_[ijk_to_index(i,j,k)];}
    00075
    00076     static int
    00077     ijk_to_index(int i, int j, int k)
    00078     {
    00079       int n = i + j + k;
    00080       int ir = n - i;
    00081       return (ir*(ir+1)>>1) + j;
    00082     }
    00083
    00084     static int
    00085     order_to_nvertex(int order)
    00086     {
    00087       return ((order+1)*(order+2)>>1);
    00088     }
    00089 };
    00090
    00091 }
    00092
    00093 #endif
    00094
    00095 // Local Variables:
    00096 // mode: c++
    00097 // c-file-style: "CLJ"
    00098 // End: