sector_2d.h

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// -*-c++-*-

 
/*
 *Copyright:
 
 Copyright (C) Hidehisa Akiyama
 
 This code 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 3 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
 
 *EndCopyright:
 */

 
#ifndef RCSC_GEOM_SECTOR2D_H
#define RCSC_GEOM_SECTOR2D_H
 
#include <geom/region_2d.h>
#include <geom/vector_2d.h>
 
namespace rcsc {

class Sector2D
    : public Region2D {
private:
    Vector2D M_center;

    double M_min_radius;
    double M_max_radius;

    AngleDeg M_angle_left_start;
    AngleDeg M_angle_right_end;

    Sector2D();
public:

    Sector2D( const Vector2D & c,
              const double & min_r,
              const double & max_r,
              const AngleDeg & start,
              const AngleDeg & end );

    const
    Sector2D & assign( const Vector2D & c,
                       const double & min_r,
                       const double & max_r,
                       const AngleDeg & start,
                       const AngleDeg & end );

    const
    Vector2D & center() const
      {
          return M_center;
      }

    const
    double & radiusMin() const
      {
          return M_min_radius;
      }

    const
    double & radiusMax() const
      {
          return M_max_radius;
      }

    const
    AngleDeg & angleLeftStart() const
      {
          return M_angle_left_start;
      }

    const
    AngleDeg & angleRightEnd() const
      {
          return M_angle_right_end;
      }

    virtual
    double area() const;

    virtual
    bool contains( const Vector2D & point ) const
      {
          Vector2D rel = point - center();
          double d2 = rel.r2();
          return ( M_min_radius * M_min_radius <= d2
                   && d2 <= M_max_radius * M_max_radius
                   && rel.th().isWithin( M_angle_left_start,
                                         M_angle_right_end ) );
      }

    double getCircumferenceMin() const
      {
          double div = ( M_angle_right_end - M_angle_left_start ).degree();
          if ( div < 0.0 )
          {
              div += 360.0;
          }
          return ( 2.0 * M_min_radius * M_PI ) * ( div / 360.0 );
      }

    double getCircumferenceMax() const
      {
          double div = ( M_angle_right_end - M_angle_left_start ).degree();
          if ( div < 0.0 )
          {
              div += 360.0;
          }
          return ( 2.0 * M_max_radius * M_PI ) * ( div / 360.0 );
      }
};
 
}
 
#endif