a_curve_lin.h

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/*
         Copyright 2010-2011 Pierre SMARS (smars@yuntech.edu.tw)
         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, either version 2 of the License, or
         (at your option) any later version.
 
         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, see <http://www.gnu.org/licenses/>.
*/
#ifndef _WE_CURVE_LIN_H_
#define _WE_CURVE_LIN_H_
 
#include "a_curve.h"
 
class a_curve_lin : public a_curve
{
        public:
                a_curve_lin(double da = 1e-6);
                a_curve_lin(const a_curve_lin&);
                ~a_curve_lin();
 
                std::vector<double>& a() {return a_;}
                const std::vector<double>& a() const {return a_;}
                double ltot() const {return ltot_;}
 
                a_point operator()(double a) const; //interpolated value
                a_point dx_axis(double a) const; // horizontal 2
                a_point dy_axis(double a) const; // cross product 3
                a_point dz_axis(double a) const; // tangent 1
 
                a_point tangent(double a) const; // tangent 1
                a_point curvature_centre() const;
                a_point curvature_centre(double a) const;
                double curvature(double a) const;
                a_curve_lin& extrapolate(double f1, double f2);
                a_curve_lin& flatten(a_curve_lin& path);
 
                friend a_curve_lin interpolate(const a_curve_lin& p1,const a_curve_lin& p2, double a);
 
                //input/output
                friend   std::istream&    operator>> (std::istream& i, a_curve_lin& m);
 
        protected:
                double                                  ltot_;
                std::vector<double>             a_;
 
                a_curve& init();
                int ref(double a) const;
};
 
#endif