se2.h

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// g2o - General Graph Optimization
// Copyright (C) 2011 R. Kuemmerle, G. Grisetti, W. Burgard
// All rights reserved.
//
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// modification, are permitted provided that the following conditions are
// met:
//
// * Redistributions of source code must retain the above copyright notice,
//   this list of conditions and the following disclaimer.
// * Redistributions in binary form must reproduce the above copyright
//   notice, this list of conditions and the following disclaimer in the
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#ifndef G2O_TUTORIAL_SE2_H
#define G2O_TUTORIAL_SE2_H

#include "g2o/stuff/misc.h"
#include "g2o/stuff/macros.h"

#include "g2o_tutorial_slam2d_api.h"

#include <Eigen/Core>
#include <Eigen/Geometry>

namespace g2o {

  namespace tutorial {

    class G2O_TUTORIAL_SLAM2D_API SE2 {
      public:
        EIGEN_MAKE_ALIGNED_OPERATOR_NEW;
        SE2():_R(0),_t(0,0){}

        SE2(double x, double y, double theta):_R(theta),_t(x,y){}

        const Eigen::Vector2d& translation() const {return _t;}

        Eigen::Vector2d& translation() {return _t;}

        const Eigen::Rotation2Dd& rotation() const {return _R;}

        Eigen::Rotation2Dd& rotation() {return _R;}

        SE2 operator * (const SE2& tr2) const{
          SE2 result(*this);
          result._t += _R*tr2._t;
          result._R.angle()+= tr2._R.angle();
          result._R.angle()=normalize_theta(result._R.angle());
          return result;
        }

        SE2& operator *= (const SE2& tr2){
          _t+=_R*tr2._t;
          _R.angle()+=tr2._R.angle();
          _R.angle()=normalize_theta(_R.angle());
          return *this;
        }

        Eigen::Vector2d operator * (const Eigen::Vector2d& v) const {
          return _t+_R*v;
        }

        SE2 inverse() const{
          SE2 ret;
          ret._R=_R.inverse();
          ret._R.angle()=normalize_theta(ret._R.angle());
          ret._t=ret._R*(Eigen::Vector2d(-1 * _t));
          return ret;
        }

        double operator [](int i) const {
          assert (i>=0 && i<3);
          if (i<2)
            return _t(i);
          return _R.angle();
        }

        double& operator [](int i) {
          assert (i>=0 && i<3);
          if (i<2)
            return _t(i);
          return _R.angle();
        }

        void fromVector (const Eigen::Vector3d& v){
          *this=SE2(v[0], v[1], v[2]);
        }

        Eigen::Vector3d toVector() const {
          Eigen::Vector3d ret;
          for (int i=0; i<3; i++){
            ret(i)=(*this)[i];
          }
          return ret;
        }

      protected:
        Eigen::Rotation2Dd _R;
        Eigen::Vector2d _t;
    };

  } // end namespace
} // end namespace

#endif