path_circle.cpp

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/***************************************************************************
  tag: Erwin Aertbelien  Mon May 10 19:10:36 CEST 2004  path_circle.cxx

                        path_circle.cxx -  description
                           -------------------
    begin                : Mon May 10 2004
    copyright            : (C) 2004 Erwin Aertbelien
    email                : erwin.aertbelien@mech.kuleuven.ac.be

 ***************************************************************************
 *   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., 59 Temple Place,                                    *
 *   Suite 330, Boston, MA  02111-1307  USA                                *
 *                                                                         *
 ***************************************************************************/
/*****************************************************************************
 *  \author
 *      Erwin Aertbelien, Div. PMA, Dep. of Mech. Eng., K.U.Leuven
 *
 *  \version
 *      ORO_Geometry V0.2
 *
 *  \par History
 *      - $log$
 *
 *  \par Release
 *      $Id: path_circle.cpp,v 1.1.1.1.2.5 2003/07/24 13:26:15 psoetens Exp $
 *      $Name:  $
 ****************************************************************************/


#include "path_circle.hpp"
#include "utilities/error.h"

namespace KDL {

Path_Circle::Path_Circle(const Frame& F_base_start,
                         const Vector& _V_base_center,
                         const Vector& V_base_p,
                         const Rotation& R_base_end,
                         double alpha,
                         RotationalInterpolation* _orient,
                         double _eqradius,
                         bool _aggregate) :
    orient(_orient) ,
    eqradius(_eqradius),
    aggregate(_aggregate)
{
    F_base_center.p = _V_base_center;
    orient->SetStartEnd(F_base_start.M,R_base_end);
    double oalpha = orient->Angle();

    Vector x(F_base_start.p - F_base_center.p);
    radius = x.Normalize();
    if (radius < epsilon) {
        if (aggregate)
            delete orient;
        throw Error_MotionPlanning_Circle_ToSmall();
    }
    Vector tmpv(V_base_p-F_base_center.p);
    tmpv.Normalize();
    Vector z( x * tmpv);
    double n = z.Normalize();
    if (n < epsilon) {
        if (aggregate)
            delete orient;
        throw Error_MotionPlanning_Circle_No_Plane();
    }
    F_base_center.M = Rotation(x,z*x,z);
    double dist = alpha*radius;
    // See what has the slowest eq. motion, and adapt
    // the other to this slower motion
    // use eqradius to transform between rot and transl.
    // the same as for lineair motion
    if (oalpha*eqradius > dist) {
        // rotational_interpolation is the limitation
        pathlength = oalpha*eqradius;
        scalerot = 1/eqradius;
        scalelin = dist/pathlength;
    } else {
        // translation is the limitation
        pathlength = dist;
        scalerot = oalpha/pathlength;
        scalelin = 1;
    }
}


double Path_Circle::LengthToS(double length) {
    return length/scalelin;
}


double Path_Circle::PathLength() {
    return pathlength;
}

Frame Path_Circle::Pos(double s) const {
    double p = s*scalelin / radius;
    return Frame(orient->Pos(s*scalerot),
                 F_base_center*Vector(radius*cos(p),radius*sin(p),0)
           );

}

Twist Path_Circle::Vel(double s,double sd) const {
    double p = s*scalelin  / radius;
    double v = sd*scalelin / radius;
    return Twist( F_base_center.M*Vector(-radius*sin(p)*v,radius*cos(p)*v,0),
                  orient->Vel(s*scalerot,sd*scalerot)
           );
}

Twist Path_Circle::Acc(double s,double sd,double sdd) const {
    double p = s*scalelin / radius;
    double cp = cos(p);
    double sp = sin(p);
    double v = sd*scalelin / radius;
    double a = sdd*scalelin / radius;
    return Twist( F_base_center.M*Vector(
                        -radius*cp*v*v  -  radius*sp*a,
                        -radius*sp*v*v  +  radius*cp*a,
                        0
                      ),
                  orient->Acc(s*scalerot,sd*scalerot,sdd*scalerot)
           );
}

Path* Path_Circle::Clone() {
    return new Path_Circle(
        Pos(0),
        F_base_center.p,
        F_base_center.M.UnitY(),
        orient->Pos(pathlength*scalerot),
        pathlength*scalelin/radius/deg2rad,
        orient->Clone(),
        eqradius,
        aggregate
    );
}

Path_Circle::~Path_Circle() {
    if (aggregate)
        delete orient;
}

void Path_Circle::Write(std::ostream& os) {
    os << "CIRCLE[ ";
    os << "  " << Pos(0) << std::endl;
    os << "  " << F_base_center.p << std::endl;
    os << "  " << F_base_center.M.UnitY() << std::endl;
    os << "  " << orient->Pos(pathlength*scalerot) << std::endl;
    os << "  " << pathlength*scalelin/radius/deg2rad << std::endl;
    os << "  ";orient->Write(os);
    os << "  " << eqradius;
    os << "]"<< std::endl;
}

}