99 lines
2.5 KiB
C++
99 lines
2.5 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) 2006 Refractions Research Inc.
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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: noding/snapround/MCIndexPointSnapper.java r486 (JTS-1.12+)
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*
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**********************************************************************/
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#pragma once
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#include <cstddef>
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#include <geos/export.h>
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// Forward declarations
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namespace geos {
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namespace geom {
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class Envelope;
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}
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namespace index {
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class SpatialIndex;
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}
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namespace noding {
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class SegmentString;
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namespace snapround {
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class HotPixel;
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}
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}
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}
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namespace geos {
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namespace noding { // geos::noding
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namespace snapround { // geos::noding::snapround
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/** \brief
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* "Snaps" all [SegmentStrings](@ref SegmentString) in a [SpatialIndex](@ref index::SpatialIndex) containing
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* [MonotoneChains](@ref index::chain::MonotoneChain) to a given HotPixel.
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*
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*/
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class GEOS_DLL MCIndexPointSnapper {
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public:
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MCIndexPointSnapper(index::SpatialIndex& nIndex)
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:
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index(nIndex)
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{}
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/** \brief
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* Snaps (nodes) all interacting segments to this hot pixel.
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*
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* The hot pixel may represent a vertex of an edge, in which case this
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* routine uses the optimization of not noding the vertex itself.
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*
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* @param hotPixel the hot pixel to snap to
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* @param parentEdge the edge containing the vertex,
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* if applicable, or `null`
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* @param vertexIndex the index of the vertex, if applicable, or -1
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* @return `true` if a node was added for this pixel
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*/
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bool snap(HotPixel& hotPixel, SegmentString* parentEdge,
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std::size_t vertexIndex);
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bool
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snap(HotPixel& hotPixel)
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{
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return snap(hotPixel, nullptr, 0);
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}
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geom::Envelope getSafeEnvelope(const HotPixel& hp) const;
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private:
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static constexpr double SAFE_ENV_EXPANSION_FACTOR = 0.75;
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index::SpatialIndex& index;
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// Declare type as noncopyable
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MCIndexPointSnapper(const MCIndexPointSnapper& other) = delete;
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MCIndexPointSnapper& operator=(const MCIndexPointSnapper& rhs) = delete;
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};
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} // namespace geos::noding::snapround
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} // namespace geos::noding
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} // namespace geos
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