135 lines
3.7 KiB
C++
135 lines
3.7 KiB
C++
/**********************************************************************
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*
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* GEOS - Geometry Engine Open Source
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* http://geos.osgeo.org
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*
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* Copyright (C) 2009 Sandro Santilli <strk@kbt.io>
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*
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* This is free software; you can redistribute and/or modify it under
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* the terms of the GNU Lesser General Public Licence as published
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* by the Free Software Foundation.
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* See the COPYING file for more information.
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*
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***********************************************************************
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*
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* Last port: operation/overlay/snap/SnapOverlayOp.java r320 (JTS-1.12)
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*
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**********************************************************************/
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#pragma once
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#include <geos/precision/CommonBitsRemover.h> // for dtor visibility by unique_ptr
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#include <geos/operation/overlayng/OverlayNG.h>
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#include <memory> // for unique_ptr
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#ifdef _MSC_VER
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#pragma warning(push)
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#pragma warning(disable: 4251) // warning C4251: needs to have dll-interface to be used by clients of class
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#endif
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// Forward declarations
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namespace geos {
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namespace geom {
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class Geometry;
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struct GeomPtrPair;
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}
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}
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namespace geos {
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namespace operation { // geos::operation
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namespace overlay { // geos::operation::overlay
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namespace snap { // geos::operation::overlay::snap
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/** \brief
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* Performs an overlay operation using snapping and enhanced precision
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* to improve the robustness of the result.
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*
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* This class <i>always</i> uses snapping.
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* This is less performant than the standard JTS overlay code,
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* and may even introduce errors which were not present in the original data.
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* For this reason, this class should only be used
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* if the standard overlay code fails to produce a correct result.
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*
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*/
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class GEOS_DLL SnapOverlayOp {
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public:
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static std::unique_ptr<geom::Geometry>
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overlayOp(const geom::Geometry& g0, const geom::Geometry& g1, int opCode)
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{
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SnapOverlayOp op(g0, g1);
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return op.getResultGeometry(opCode);
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}
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static std::unique_ptr<geom::Geometry>
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intersection(const geom::Geometry& g0, const geom::Geometry& g1)
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{
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return overlayOp(g0, g1, overlayng::OverlayNG::INTERSECTION);
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}
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static std::unique_ptr<geom::Geometry>
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Union(const geom::Geometry& g0, const geom::Geometry& g1)
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{
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return overlayOp(g0, g1, overlayng::OverlayNG::UNION);
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}
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static std::unique_ptr<geom::Geometry>
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difference(const geom::Geometry& g0, const geom::Geometry& g1)
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{
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return overlayOp(g0, g1, overlayng::OverlayNG::DIFFERENCE);
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}
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static std::unique_ptr<geom::Geometry>
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symDifference(const geom::Geometry& g0, const geom::Geometry& g1)
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{
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return overlayOp(g0, g1, overlayng::OverlayNG::SYMDIFFERENCE);
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}
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SnapOverlayOp(const geom::Geometry& g1, const geom::Geometry& g2)
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:
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geom0(g1),
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geom1(g2)
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{
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computeSnapTolerance();
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}
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std::unique_ptr<geom::Geometry> getResultGeometry(int opCode);
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private:
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void computeSnapTolerance();
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void snap(geom::GeomPtrPair& ret);
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void removeCommonBits(const geom::Geometry& geom0,
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const geom::Geometry& geom1,
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geom::GeomPtrPair& ret);
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// re-adds common bits to the given geom
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void prepareResult(geom::Geometry& geom);
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const geom::Geometry& geom0;
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const geom::Geometry& geom1;
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double snapTolerance;
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std::unique_ptr<precision::CommonBitsRemover> cbr;
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// Declare type as noncopyable
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SnapOverlayOp(const SnapOverlayOp& other) = delete;
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SnapOverlayOp& operator=(const SnapOverlayOp& rhs) = delete;
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};
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} // namespace geos::operation::overlay::snap
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} // namespace geos::operation::overlay
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} // namespace geos::operation
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} // namespace geos
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#ifdef _MSC_VER
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#pragma warning(pop)
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#endif
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