114 lines
2.8 KiB
C
114 lines
2.8 KiB
C
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/**********************************************************************
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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) 2020 Paul Ramsey <pramsey@cleverelephant.ca>
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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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#pragma once
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#include <geos/geom/Point.h>
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#include <geos/operation/overlayng/OverlayNG.h>
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#include <geos/export.h>
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#include <vector>
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#include <memory>
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// Forward declarations
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namespace geos {
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namespace geom {
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class GeometryFactory;
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}
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namespace operation {
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namespace overlayng {
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class OverlayEdge;
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class OverlayGraph;
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class OverlayLabel;
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}
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}
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}
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namespace geos { // geos.
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namespace operation { // geos.operation
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namespace overlayng { // geos.operation.overlayng
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/**
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* Extracts Point resultants from an overlay graph
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* created by an Intersection operation
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* between non-Point inputs.
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* Points may be created during intersection
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* if lines or areas touch one another at single points.
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* Intersection is the only overlay operation which can
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* result in Points from non-Point inputs.
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* <p>
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* Overlay operations where one or more inputs
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* are Points are handled via a different code path.
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*
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*
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* @author Martin Davis
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*
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* @see OverlayPoints
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*
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*/
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class GEOS_DLL IntersectionPointBuilder {
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private:
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// Members
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OverlayGraph* graph;
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const geom::GeometryFactory* geometryFactory;
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std::vector<std::unique_ptr<geom::Point>> points;
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/**
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* Controls whether lines created by area topology collapses
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* to participate in the result computation.
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* True provides the original JTS semantics.
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*/
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bool isAllowCollapseLines;
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// Methods
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void addResultPoints();
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/**
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* Tests if a node is a result point.
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* This is the case if the node is incident on edges from both
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* inputs, and none of the edges are themselves in the result.
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*/
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bool isResultPoint(OverlayEdge* nodeEdge) const;
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bool isEdgeOf(const OverlayLabel* label, uint8_t i) const;
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public:
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IntersectionPointBuilder(OverlayGraph* p_graph, const geom::GeometryFactory* geomFact)
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: graph(p_graph)
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, geometryFactory(geomFact)
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, isAllowCollapseLines(!OverlayNG::STRICT_MODE_DEFAULT)
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{}
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std::vector<std::unique_ptr<geom::Point>> getPoints();
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IntersectionPointBuilder(const IntersectionPointBuilder&) = delete;
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IntersectionPointBuilder& operator=(const IntersectionPointBuilder&) = delete;
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void setStrictMode(bool p_isStrictMode)
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{
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isAllowCollapseLines = ! p_isStrictMode;
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}
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};
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} // namespace geos.operation.overlayng
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} // namespace geos.operation
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} // namespace geos
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