src/polygons.h (b49e073) - dxfngc · BlinkenArea

polygons.h

/* drawing (DXF) to G-code (NGC) converter
 * Copyright 2013 Stefan Schuermans <stefan@schuermans.info>
 * Copyleft: GNU public license - http://www.gnu.org/copyleft/gpl.html
 */

#ifndef POLYGONS_H
#define POLYGONS_H

#include <boost/shared_ptr.hpp>
#include <vector>

#include <CGAL/Exact_predicates_exact_constructions_kernel.h>
#include <CGAL/Polygon_2.h>
#include <CGAL/Polygon_with_holes_2.h>
#include <CGAL/create_straight_skeleton_from_polygon_with_holes_2.h>

#include "layer.h"

/// a set of polygons
class Polygons {
public:
  typedef CGAL::Exact_predicates_exact_constructions_kernel CgKern;

typedef CgKern::Point_2                    CgPoint;
  typedef CGAL::Polygon_2<CgKern>            CgPoly;
  typedef CGAL::Polygon_with_holes_2<CgKern> CgPolyHoles;
  typedef CGAL::Straight_skeleton_2<CgKern>  CgSs;
  typedef std::vector<CgPoly>                CgPolyVec;
  typedef std::vector<CgPolyHoles>           CgPolyHolesVec;
  typedef boost::shared_ptr<CgPoly>          CgPolyPtr;
  typedef boost::shared_ptr<CgPolyHoles>     CgPolyHolesPtr;
  typedef boost::shared_ptr<CgSs>            CgSsPtr;
  typedef std::vector<CgPolyPtr>             CgPolyPtrVec;
  typedef std::vector<CgPolyHolesPtr>        CgPolyHolesPtrVec;

/**
   * @brief clear all polygons
   */
  void clear();

/**
   * @brief add polygons from layer
   * @param[in] layer layer to obtain the polygons from
   * @param[in] eqDist maximum distance of two points to be considered equal
   * @return if the layer could be converted to polygons and imported
   */
  bool addLayer(const Layer &layer, double eqDist);

/**
   * @brief load polygons from layer
   * @param[in] layer layer to obtain the polygons from
   * @param[in] eqDist maximum distance of two points to be considered equal
   * @return if the layer could be converted to polygons and imported
   */
  bool loadLayer(const Layer &layer, double eqDist);

/**
   * @brief create inner offset polygons
   * @param[in] offset offset, > 0.0
   * @param[out] offsetPolys offset polygons (!= *this)
   * @return if inner offset polygons could be constructed
   */
  bool createInnerOffset(double offset, Polygons &offsetPolys) const;

/**
   * @brief create outer offset polygons
   * @param[in] offset offset, > 0.0
   * @param[out] offsetPolys offset polygons (!= *this)
   * @return if outer offset polygons could be constructed
   */
  bool createOuterOffset(double offset, Polygons &offsetPolys) const;

/**
   * @brief fill insides of polygons by creating inner offset polygons
   * @param[in] offset offset, > 0.0
   * @param[out] offsetPolys offset polygons (!= *this)
   * @return if insides of polygons could be filles with inner offset polygons
   */
  bool fillInnerOffset(double offset, Polygons &offsetPolys) const;

/**
   * @brief add all polygons with holes as multiple paths to a layer
   * @param[in,out] layer layer to add paths to
   */
  void addToLayer(Layer &layer) const;

/**
   * @brief write all polygons with holes as multiple paths to a layer
   * @param[in,out] layer layer to write paths to
   */
  void writeToLayer(Layer &layer) const;

protected:
  /**
   * @brief create outer offset polygon
   * @param[in] poly polygon to create outer offset of
   * @param[in] offset offset, > 0.0
   * @param[out] offsetPoly offset polygon (!= *this)
   * @return if outer offset polygon could be constructed
   */
  static bool createOuterOffsetPoly(const CgPolyHoles &poly, double offset,
                                    CgPolyHoles &offsetPoly);

/**
   * @brief add a polygon as path to a layer
   * @param[in] poly polygon to add to layer
   * @param[in,out] layer layer to add path to
   */
  static void PolyToLayer(const CgPoly &poly, Layer &layer);

/**
   * @brief add a polygon with holes as multiple paths to a layer
   * @param[in] poly polygon with holes to add to layer
   * @param[in,out] layer layer to add paths to
   */
  static void PolyHolesToLayer(const CgPolyHoles &poly, Layer &layer);

public:
  /// polygons
  CgPolyHolesVec mPolys;
};

#endif // #ifndef POLYGONS_H

dxfngc

newer CGAL really needs exect kernel for polygon intersections and differences