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/**
* Copyright (C) 2014 10gen Inc.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License, version 3,
* as published by the Free Software Foundation.
*
* This program 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 Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
* As a special exception, the copyright holders give permission to link the
* code of portions of this program with the OpenSSL library under certain
* conditions as described in each individual source file and distribute
* linked combinations including the program with the OpenSSL library. You
* must comply with the GNU Affero General Public License in all respects for
* all of the code used other than as permitted herein. If you modify file(s)
* with this exception, you may extend this exception to your version of the
* file(s), but you are not obligated to do so. If you do not wish to do so,
* delete this exception statement from your version. If you delete this
* exception statement from all source files in the program, then also delete
* it in the license file.
*/
#pragma once
#include <boost/scoped_ptr.hpp>
#include <vector>
#include "mongo/db/geo/s2.h"
#include "third_party/s2/s2cap.h"
#include "third_party/s2/s2cell.h"
#include "third_party/s2/s2loop.h"
#include "third_party/s2/s2polygon.h"
#include "third_party/s2/s2polyline.h"
#include "third_party/s2/s2region.h"
namespace mongo {
// Simple GeoJSON polygon with a custom CRS identifier as having a strict winding order.
// The winding order will determine unambiguously the inside/outside of the polygon even
// if larger than one hemisphere.
//
// BigSimplePolygon uses S2Loop internally, which follows a left-foot rule (inside to the
// left when walking the edge of the polygon, counter-clockwise)
class BigSimplePolygon : public S2Region {
public:
BigSimplePolygon();
BigSimplePolygon(S2Loop* loop);
virtual ~BigSimplePolygon();
void Init(S2Loop* loop);
double GetArea() const;
bool Contains(const S2Polygon& polygon) const;
bool Contains(const S2Polyline& line) const;
// Needs to be this way for S2 compatibility
bool Contains(S2Point const& point) const;
bool Intersects(const S2Polygon& polygon) const;
bool Intersects(const S2Polyline& line) const;
bool Intersects(S2Point const& point) const;
// Only used in tests
void Invert();
const S2Polygon& GetPolygonBorder() const;
const S2Polyline& GetLineBorder() const;
//
// S2Region interface
//
BigSimplePolygon* Clone() const;
S2Cap GetCapBound() const;
S2LatLngRect GetRectBound() const;
bool Contains(S2Cell const& cell) const;
bool MayIntersect(S2Cell const& cell) const;
bool VirtualContainsPoint(S2Point const& p) const;
void Encode(Encoder* const encoder) const;
bool Decode(Decoder* const decoder);
bool DecodeWithinScope(Decoder* const decoder);
private:
boost::scoped_ptr<S2Loop> _loop;
// Cache whether the loop area is at most 2*Pi (the area of hemisphere).
//
// S2 guarantees that any loop in a valid (normalized) polygon, no matter a hole
// or a shell, has to be less than 2*Pi. So if the loop is normalized, it's the same
// with the border polygon, otherwise, the border polygon is its complement.
bool _isNormalized;
// Cached to do Intersects() and Contains() with S2Polylines.
mutable boost::scoped_ptr<S2Polyline> _borderLine;
mutable boost::scoped_ptr<S2Polygon> _borderPoly;
};
}
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