123 lines
2.7 KiB
C
123 lines
2.7 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) 2011 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: geom/util/SineStarFactory.java r378 (JTS-1.12)
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*
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**********************************************************************/
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#pragma once
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#include <geos/export.h>
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#include <geos/util/GeometricShapeFactory.h> // for inheritance
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#include <memory>
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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 Coordinate;
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class Envelope;
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class Polygon;
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class GeometryFactory;
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class PrecisionModel;
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class LineString;
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}
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}
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namespace geos {
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namespace geom { // geos::geom
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namespace util { // geos::geom::util
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/**
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* Creates geometries which are shaped like multi-armed stars
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* with each arm shaped like a sine wave.
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* These kinds of geometries are useful as a more complex
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* geometry for testing algorithms.
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*
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* @author Martin Davis
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*
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*/
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class GEOS_DLL SineStarFactory : public geos::util::GeometricShapeFactory {
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protected:
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int numArms;
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double armLengthRatio;
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public:
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/**
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* Creates a factory which will create sine stars using the given
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* {@link GeometryFactory}.
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*
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* @param fact the factory to use. You need to keep the
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* factory alive for the whole SineStarFactory
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* life time.
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*/
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SineStarFactory(const geom::GeometryFactory* fact)
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:
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geos::util::GeometricShapeFactory(fact),
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numArms(8),
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armLengthRatio(0.5)
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{}
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/**
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* Sets the number of arms in the star
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*
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* @param nArms the number of arms to generate
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*/
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void
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setNumArms(int nArms)
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{
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numArms = nArms;
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}
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/**
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* Sets the ration of the length of each arm to the distance from the tip
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* of the arm to the centre of the star.
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* Value should be between 0.0 and 1.0
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*
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* @param armLenRatio
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*/
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void
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setArmLengthRatio(double armLenRatio)
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{
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armLengthRatio = armLenRatio;
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}
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/**
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* Generates the geometry for the sine star
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*
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* @return the geometry representing the sine star
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*/
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std::unique_ptr<Polygon> createSineStar() const;
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};
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} // namespace geos::geom::util
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} // namespace geos::geom
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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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