jacobian.cpp

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// Copyright  (C)  2007  Ruben Smits <ruben dot smits at mech dot kuleuven dot be>

// Version: 1.0
// Author: Ruben Smits <ruben dot smits at mech dot kuleuven dot be>
// Maintainer: Ruben Smits <ruben dot smits at mech dot kuleuven dot be>
// URL: http://www.orocos.org/kdl

// This library is free software; you can redistribute it and/or
// modify it under the terms of the GNU Lesser General Public
// License as published by the Free Software Foundation; either
// version 2.1 of the License, or (at your option) any later version.

// This library 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
// Lesser General Public License for more details.

// You should have received a copy of the GNU Lesser General Public
// License along with this library; if not, write to the Free Software
// Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA

#include "jacobian.hpp"

namespace KDL
{
    Jacobian::Jacobian(unsigned int _size,unsigned int _nr_blocks):
        size(_size),nr_blocks(_nr_blocks)
    {
        twists = new Twist[size*nr_blocks];
    }

    Jacobian::Jacobian(const Jacobian& arg):
                       size(arg.columns()),
                       nr_blocks(arg.nr_blocks)
    {
        twists = new Twist[size*nr_blocks];
        for(unsigned int i=0;i<size*nr_blocks;i++)
            twists[i] = arg.twists[i];
    }

    Jacobian& Jacobian::operator = (const Jacobian& arg)
    {
        assert(size==arg.size);
        assert(nr_blocks==arg.nr_blocks);
        for(unsigned int i=0;i<size;i++)
            twists[i]=arg.twists[i];
        return *this;
    }


    Jacobian::~Jacobian()
    {
        delete [] twists;
    }

    double Jacobian::operator()(int i,int j)const
    {
        assert(i<6*(int)nr_blocks&&j<(int)size);
        return twists[j+6*(int)(floor((double)i/6))](i%6);
    }

    double& Jacobian::operator()(int i,int j)
    {
        assert(i<6*(int)nr_blocks&&j<(int)size);
        return twists[j+6*(int)(floor((double)i/6))](i%6);
    }

    unsigned int Jacobian::rows()const
    {
        return 6*nr_blocks;
    }

    unsigned int Jacobian::columns()const
    {
        return size;
    }

    void SetToZero(Jacobian& jac)
    {
        for(unsigned int i=0;i<jac.size*jac.nr_blocks;i++)
            SetToZero(jac.twists[i]);
    }

    void changeRefPoint(const Jacobian& src1, const Vector& base_AB, Jacobian& dest)
    {
        assert(src1.size==dest.size);
        assert(src1.nr_blocks==dest.nr_blocks);
        for(unsigned int i=0;i<src1.size*src1.nr_blocks;i++)
            dest.twists[i]=src1.twists[i].RefPoint(base_AB);
    }

    void changeBase(const Jacobian& src1, const Rotation& rot, Jacobian& dest)
    {
        assert(src1.size==dest.size);
        assert(src1.nr_blocks==dest.nr_blocks);
        for(unsigned int i=0;i<src1.size*src1.nr_blocks;i++)
            dest.twists[i]=rot*src1.twists[i];
    }

    void changeRefFrame(const Jacobian& src1,const Frame& frame, Jacobian& dest)
    {
        assert(src1.size==dest.size);
        assert(src1.nr_blocks==dest.nr_blocks);
        for(unsigned int i=0;i<src1.size*src1.nr_blocks;i++)
            dest.twists[i]=frame*src1.twists[i];
    }

    bool Jacobian::operator ==(const Jacobian& arg)
    {
        return Equal((*this),arg);
    }
    
    bool Jacobian::operator!=(const Jacobian& arg)
    {
        return !Equal((*this),arg);
    }
    
    bool Equal(const Jacobian& a,const Jacobian& b,double eps)
    {
        if(a.rows()==b.rows()&&a.columns()==b.columns()){
            bool rc=true;
            for(unsigned int i=0;i<a.columns();i++)
                rc&=Equal(a.twists[i],b.twists[i],eps);
            return rc;
        }else
            return false;
    }
    
}