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/**
* \file
* \brief Path intersection graph
*//*
* Authors:
* Krzysztof Kosiński <tweenk.pl@gmail.com>
*
* Copyright 2015 Authors
*
* This library is free software; you can redistribute it and/or
* modify it either under the terms of the GNU Lesser General Public
* License version 2.1 as published by the Free Software Foundation
* (the "LGPL") or, at your option, under the terms of the Mozilla
* Public License Version 1.1 (the "MPL"). If you do not alter this
* notice, a recipient may use your version of this file under either
* the MPL or the LGPL.
*
* You should have received a copy of the LGPL along with this library
* in the file COPYING-LGPL-2.1; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
* You should have received a copy of the MPL along with this library
* in the file COPYING-MPL-1.1
*
* The contents of this file are subject to the Mozilla Public License
* Version 1.1 (the "License"); you may not use this file except in
* compliance with the License. You may obtain a copy of the License at
* http://www.mozilla.org/MPL/
*
* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY
* OF ANY KIND, either express or implied. See the LGPL or the MPL for
* the specific language governing rights and limitations.
*/
#ifndef SEEN_LIB2GEOM_INTERSECTION_GRAPH_H
#define SEEN_LIB2GEOM_INTERSECTION_GRAPH_H
#include <set>
#include <vector>
#include <boost/ptr_container/ptr_vector.hpp>
#include <boost/intrusive/list.hpp>
#include <2geom/forward.h>
#include <2geom/pathvector.h>
namespace Geom {
class PathIntersectionGraph
{
// this is called PathIntersectionGraph so that we can also have a class for polygons,
// e.g. PolygonIntersectionGraph, which is going to be significantly faster
public:
PathIntersectionGraph(PathVector const &a, PathVector const &b, Coord precision = EPSILON);
PathVector getUnion();
PathVector getIntersection();
PathVector getAminusB();
PathVector getBminusA();
PathVector getXOR();
/// Returns the number of intersections used when computing Boolean operations.
std::size_t size() const;
std::vector<Point> intersectionPoints(bool defective = false) const;
std::vector<Point> windingPoints() const {
return _winding_points;
}
void fragments(PathVector &in, PathVector &out) const;
bool valid() const { return _graph_valid; }
private:
enum InOutFlag {
INSIDE,
OUTSIDE,
BOTH
};
struct IntersectionVertex {
boost::intrusive::list_member_hook<> _hook;
boost::intrusive::list_member_hook<> _proc_hook;
PathVectorTime pos;
Point p; // guarantees that endpoints are exact
IntersectionVertex *neighbor;
InOutFlag next_edge;
unsigned which;
bool defective;
};
typedef boost::intrusive::list
< IntersectionVertex
, boost::intrusive::member_hook
< IntersectionVertex
, boost::intrusive::list_member_hook<>
, &IntersectionVertex::_hook
>
> IntersectionList;
typedef boost::intrusive::list
< IntersectionVertex
, boost::intrusive::member_hook
< IntersectionVertex
, boost::intrusive::list_member_hook<>
, &IntersectionVertex::_proc_hook
>
> UnprocessedList;
struct PathData {
IntersectionList xlist;
std::size_t path_index;
int which;
InOutFlag status;
PathData(int w, std::size_t pi)
: path_index(pi)
, which(w)
, status(BOTH)
{}
};
struct IntersectionVertexLess;
typedef IntersectionList::iterator ILIter;
typedef IntersectionList::const_iterator CILIter;
PathVector _getResult(bool enter_a, bool enter_b);
void _handleNonintersectingPaths(PathVector &result, unsigned which, bool inside);
void _prepareArguments();
bool _prepareIntersectionLists(Coord precision);
void _assignEdgeWindingParities(Coord precision);
void _assignComponentStatusFromDegenerateIntersections();
void _removeDegenerateIntersections();
void _verify();
ILIter _getNeighbor(ILIter iter);
PathData &_getPathData(ILIter iter);
PathVector _pv[2];
boost::ptr_vector<IntersectionVertex> _xs;
boost::ptr_vector<PathData> _components[2];
UnprocessedList _ulist;
bool _graph_valid;
std::vector<Point> _winding_points;
friend std::ostream &operator<<(std::ostream &, PathIntersectionGraph const &);
};
std::ostream &operator<<(std::ostream &os, PathIntersectionGraph const &pig);
} // namespace Geom
#endif // SEEN_LIB2GEOM_PATH_GRAPH_H
/*
Local Variables:
mode:c++
c-file-style:"stroustrup"
c-file-offsets:((innamespace . 0)(inline-open . 0)(case-label . +))
indent-tabs-mode:nil
fill-column:99
End:
*/
// vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:fileencoding=utf-8:textwidth=99 :
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