vpPolygon.h

/****************************************************************************
 *
 * This file is part of the ViSP software.
 * Copyright (C) 2005 - 2017 by Inria. All rights reserved.
 *
 * This software 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.
 * See the file LICENSE.txt at the root directory of this source
 * distribution for additional information about the GNU GPL.
 *
 * For using ViSP with software that can not be combined with the GNU
 * GPL, please contact Inria about acquiring a ViSP Professional
 * Edition License.
 *
 * See http://visp.inria.fr for more information.
 *
 * This software was developed at:
 * Inria Rennes - Bretagne Atlantique
 * Campus Universitaire de Beaulieu
 * 35042 Rennes Cedex
 * France
 *
 * If you have questions regarding the use of this file, please contact
 * Inria at visp@inria.fr
 *
 * This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
 * WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
 *
 * Description:
 * Defines a generic 2D polygon.
 *
 * Author:
 * Amaury Dame
 * Nicolas Melchior
 * Romain Tallonneau
 *
 *****************************************************************************/

#ifndef vpPolygon_h
#define vpPolygon_h

#include <list>
#include <vector>

#include <visp3/core/vpCameraParameters.h>
#include <visp3/core/vpColor.h>
#include <visp3/core/vpImage.h>
#include <visp3/core/vpImagePoint.h>
#include <visp3/core/vpPoint.h>
#include <visp3/core/vpRect.h>

class VISP_EXPORT vpPolygon
{
protected:
  std::vector<vpImagePoint> _corners;
  vpImagePoint _center;
  double _area;
  bool _goodPoly;
  vpRect _bbox;

public:
  enum PointInPolygonMethod {
    PnPolySegmentIntersection, 
    PnPolyRayCasting           
  };

  vpPolygon();
  explicit vpPolygon(const std::vector<vpImagePoint> &corners);
  explicit vpPolygon(const std::list<vpImagePoint> &corners);
  vpPolygon(const vpPolygon &poly);
  virtual ~vpPolygon();

  vpPolygon &operator=(const vpPolygon &poly);

  void buildFrom(const std::vector<vpImagePoint> &corners);
  void buildFrom(const std::list<vpImagePoint> &corners);
  void buildFrom(const std::vector<vpPoint> &corners, const vpCameraParameters &cam);

  unsigned int getSize() const;
  void initClick(const vpImage<unsigned char> &I, unsigned int size = 5, const vpColor &color = vpColor::red,
                 unsigned int thickness = 1);
  void initClick(const vpImage<vpRGBa> &I, unsigned int size = 5, const vpColor &color = vpColor::red,
                 unsigned int thickness = 1);

  bool isInside(const vpImagePoint &iP, const PointInPolygonMethod &method = PnPolyRayCasting) const;

  void display(const vpImage<unsigned char> &I, const vpColor &color, unsigned int thickness = 1) const;

  const std::vector<vpImagePoint> &getCorners() const { return _corners; }

  inline double getArea() const { return this->_area; }

  inline vpImagePoint getCenter() const { return this->_center; }

  inline vpRect getBoundingBox() const { return _bbox; }

protected:
  void init(const std::vector<vpImagePoint> &corners);
  void init(const std::list<vpImagePoint> &corners);
  void updateArea();
  void updateCenter();
  void updateBoundingBox();

private:
  bool testIntersectionSegments(const vpImagePoint &ip1, const vpImagePoint &ip2, const vpImagePoint &ip3,
                                const vpImagePoint &ip4) const;
  void precalcValuesPnPoly();

  std::vector<double> m_PnPolyConstants;
  std::vector<double> m_PnPolyMultiples;

  //###################
  // Static Functions
  //###################

public:
  static bool isInside(const std::vector<vpImagePoint> &roi, const double &i, const double &j,
                       const PointInPolygonMethod &method = PnPolyRayCasting);
};

#endif