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/********************************************************************** * * GEOS - Geometry Engine Open Source * http://geos.osgeo.org * * Copyright (C) 2009-2011 Sandro Santilli * Copyright (C) 2005-2007 Refractions Research Inc. * Copyright (C) 2001-2002 Vivid Solutions Inc. * * This is free software; you can redistribute and/or modify it under * the terms of the GNU Lesser General Public Licence as published * by the Free Software Foundation. * See the COPYING file for more information. * ********************************************************************** * * Last port: operation/buffer/BufferOp.java r378 (JTS-1.12) * **********************************************************************/ #pragma once #include // for unique_ptr #include // for vector #include #include // for enum values #include // to materialize Geometry #include // for composition #ifdef _MSC_VER #pragma warning(push) #pragma warning(disable: 4251) // warning C4251: needs to have dll-interface to be used by clients of class #endif // Forward declarations namespace geos { namespace geom { class PrecisionModel; class Geometry; } } namespace geos { namespace operation { // geos.operation namespace buffer { // geos.operation.buffer /** * \class BufferOp * * \brief * Computes the buffer of a geometry, for both positive and negative * buffer distances. * * In GIS, the positive (or negative) buffer of a geometry is defined as * the Minkowski sum (or difference) of the geometry * with a circle with radius equal to the absolute value of the buffer * distance. * In the CAD/CAM world buffers are known as *offset curves*. * In morphological analysis the operation of positive and negative buffering * is referred to as *erosion* and *dilation*. * * The buffer operation always returns a polygonal result. * The negative or zero-distance buffer of lines and points is always * an empty Polygon. * * Since true buffer curves may contain circular arcs, * computed buffer polygons can only be approximations to the true geometry. * The user can control the accuracy of the curve approximation by specifying * the number of linear segments with which to approximate a curve. * * The end cap style of a linear buffer may be specified. * The following end cap styles are supported: * - CAP_ROUND - the usual round end caps * - CAP_BUTT - end caps are truncated flat at the line ends * - CAP_SQUARE - end caps are squared off at the buffer distance * beyond the line ends * */ class GEOS_DLL BufferOp { private: /** \brief * A number of digits of precision which leaves some computational "headroom" * for floating point operations. * * This value should be less than the decimal precision of double-precision values (16). */ static constexpr int MAX_PRECISION_DIGITS = 12; const geom::Geometry* argGeom; util::TopologyException saveException; double distance; BufferParameters bufParams; std::unique_ptr resultGeometry; bool isInvertOrientation = false; /** * Compute a reasonable scale factor to limit the precision of * a given combination of Geometry and buffer distance. * The scale factor is based on a heuristic. * * @param g the Geometry being buffered * * @param distance the buffer distance * * @param maxPrecisionDigits the mzx # of digits that should be * allowed by the precision determined by the * computed scale factor * * @return a scale factor that allows a reasonable amount of * precision for the buffer computation */ static double precisionScaleFactor(const geom::Geometry* g, double distance, int maxPrecisionDigits); void computeGeometry(); void bufferOriginalPrecision(); void bufferReducedPrecision(int precisionDigits); void bufferReducedPrecision(); void bufferFixedPrecision(const geom::PrecisionModel& fixedPM); static void extractPolygons( geom::Geometry* poly0, std::vector>& polys); public: enum { /// Specifies a round line buffer end cap style. /// @deprecated use BufferParameters CAP_ROUND = BufferParameters::CAP_ROUND, /// Specifies a butt (or flat) line buffer end cap style. /// @deprecated use BufferParameters CAP_BUTT = BufferParameters::CAP_FLAT, /// Specifies a square line buffer end cap style. /// @deprecated use BufferParameters CAP_SQUARE = BufferParameters::CAP_SQUARE }; /** \brief * Computes the buffer for a geometry for a given buffer distance * and accuracy of approximation. * * @param g the geometry to buffer * @param distance the buffer distance * @param quadrantSegments the number of segments used to * approximate a quarter circle * @param endCapStyle line buffer end cap style (default: BufferParameters::CAP_ROUND) * @return the buffer of the input geometry * */ static std::unique_ptr bufferOp( const geom::Geometry* g, double distance, int quadrantSegments = BufferParameters::DEFAULT_QUADRANT_SEGMENTS, int endCapStyle = BufferParameters::CAP_ROUND); static std::unique_ptr bufferOp( const geom::Geometry* g, double distance, BufferParameters& bufParms); /** \brief * Initializes a buffer computation for the given geometry. * * @param g the geometry to buffer */ BufferOp(const geom::Geometry* g) : argGeom(g), bufParams(), resultGeometry(nullptr), isInvertOrientation(false) { } /** \brief * Initializes a buffer computation for the given geometry * with the given set of parameters. * * @param g the geometry to buffer * @param params the buffer parameters to use. This class will * copy it to private memory. */ BufferOp(const geom::Geometry* g, const BufferParameters& params) : argGeom(g), bufParams(params), resultGeometry(nullptr), isInvertOrientation(false) { } /** \brief * Specifies the end cap style of the generated buffer. * * The styles supported are CAP_ROUND, CAP_BUTT, and CAP_SQUARE. * The default is CAP_ROUND. * * @param nEndCapStyle the end cap style to specify */ inline void setEndCapStyle(int nEndCapStyle); /** \brief * Sets the number of segments used to approximate a angle fillet * * @param nQuadrantSegments the number of segments in a fillet for a quadrant */ inline void setQuadrantSegments(int nQuadrantSegments); /** \brief * Sets whether the computed buffer should be single-sided. * * A single-sided buffer is constructed on only one side * of each input line. * * The side used is determined by the sign of the buffer distance: * - a positive distance indicates the left-hand side * - a negative distance indicates the right-hand side * * The single-sided buffer of point geometries is * the same as the regular buffer. * * The End Cap Style for single-sided buffers is * always ignored, * and forced to the equivalent of `CAP_FLAT`. * * @param isSingleSided `true` if a single-sided buffer * should be constructed */ inline void setSingleSided(bool isSingleSided); /** \brief * Returns the buffer computed for a geometry for a given buffer * distance. * * @param nDistance the buffer distance * @return the buffer of the input geometry */ std::unique_ptr getResultGeometry(double nDistance); /** * Buffers a geometry with distance zero. * The result can be computed using the maximum-signed-area orientation, * or by combining both orientations. * * This can be used to fix an invalid polygonal geometry to be valid * (i.e. with no self-intersections). * For some uses (e.g. fixing the result of a simplification) * a better result is produced by using only the max-area orientation. * Other uses (e.g. fixing geometry) require both orientations to be used. * * This function is for INTERNAL use only. * * @param geom the polygonal geometry to buffer by zero * @param isBothOrientations true if both orientations of input rings should be used * @return the buffered polygonal geometry */ static std::unique_ptr bufferByZero( const geom::Geometry* geom, bool isBothOrientations); }; // BufferOp inlines void BufferOp::setQuadrantSegments(int q) { bufParams.setQuadrantSegments(q); } void BufferOp::setEndCapStyle(int s) { bufParams.setEndCapStyle((BufferParameters::EndCapStyle)s); } void BufferOp::setSingleSided(bool isSingleSided) { bufParams.setSingleSided(isSingleSided); } } // namespace geos::operation::buffer } // namespace geos::operation } // namespace geos #ifdef _MSC_VER #pragma warning(pop) #endif