CrossTanOffDist.h

//===========================================================================
// GoTools - SINTEF Geometry Tools version 1.1
//
// GoTools module: CORE
//
// Copyright (C) 2000-2007 SINTEF ICT, Applied Mathematics, Norway.
//
// This program is free software; you can redistribute it and/or          
// modify it under the terms of the GNU General Public License            
// as published by the Free Software Foundation version 2 of the License. 
//
// This program is distributed in the hope that it will be useful,        
// but WITHOUT ANY WARRANTY; without even the implied warranty of         
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the          
// GNU General Public License for more details.                           
//
// You should have received a copy of the GNU General Public License      
// along with this program; if not, write to the Free Software            
// Foundation, Inc.,                                                      
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//
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// SINTEF ICT, Department of Applied Mathematics,                         
// P.O. Box 124 Blindern,                                                 
// 0314 Oslo, Norway.                                                     
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//===========================================================================
#ifndef _GOCROSSTANOFFDIST_
#define _GOCROSSTANOFFDIST_

#include "EvalCurve.h"
#include "SplineCurve.h"
#include <vector>
#include <boost/smart_ptr.hpp>


namespace Go
{


class CrossTanOffDist : public EvalCurve
{
public:

    CrossTanOffDist(boost::shared_ptr<SplineCurve>& poscurve,
                    boost::shared_ptr<SplineCurve>& tangcv1,
                    boost::shared_ptr<SplineCurve>& tangcv2,
                    boost::shared_ptr<SplineCurve>& blend1,
                    boost::shared_ptr<SplineCurve>& blend2,
                    boost::shared_ptr<SplineCurve>& opposite1,
                    boost::shared_ptr<SplineCurve>& opposite2,
                    double factor);


    virtual ~CrossTanOffDist();

    virtual Point eval( double t) const;

    virtual void eval( double t, int n, Point der[]) const; // n = order of diff

    virtual double start() const;

    virtual double end() const;

    virtual int dim() const;

    virtual bool approximationOK(double par, Point approxpos,
                                 double tol1, double tol2) const;

private:
    const boost::shared_ptr<SplineCurve> poscurve_;
    std::vector<boost::shared_ptr<SplineCurve> > tangcurves_;
    std::vector<boost::shared_ptr<SplineCurve> > blends_;
    boost::shared_ptr<SplineCurve> oppositepos_;
    boost::shared_ptr<SplineCurve> lengthfac_;
    boost::shared_ptr<SplineCurve> avcross_;
    const double epstol_;

    void evalcrtan(double t, Point& blend, Point& projdiff) const ;

    void evalcrtan(double t, int n, Point derblend[], Point derproj[]) const;

    Point evalblend(double t) const;

    Point evaldiff(double t) const ;

    void evaldiff(double t, int n, Point der[]) const ;
};


} // namespace Go

#endif

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