BufferOp.h

/**********************************************************************
 *
 * GEOS - Geometry Engine Open Source
 * http://geos.osgeo.org
 *
 * Copyright (C) 2009-2011 Sandro Santilli <strk@keybit.net>
 * 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)
 *
 **********************************************************************/
 
#ifndef GEOS_OP_BUFFER_BUFFEROP_H
#define GEOS_OP_BUFFER_BUFFEROP_H
 
#include <geos/export.h>
#include <geos/operation/buffer/BufferParameters.h> // for enum values 
 
#include <geos/util/TopologyException.h> // 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 GEOS_DLL BufferOp {
 
 
private:

        static const int MAX_PRECISION_DIGITS = 12;

        static double precisionScaleFactor(const geom::Geometry *g,
                        double distance, int maxPrecisionDigits);
 
        const geom::Geometry *argGeom;
 
        util::TopologyException saveException;
 
        double distance;
 
        //int quadrantSegments;
        //int endCapStyle;
        BufferParameters bufParams;
 
        geom::Geometry* resultGeometry;
 
        void computeGeometry();
 
        void bufferOriginalPrecision();
 
        void bufferReducedPrecision(int precisionDigits);
 
        void bufferReducedPrecision();
 
        void bufferFixedPrecision(const geom::PrecisionModel& fixedPM);
 
public:
 
        enum {
                CAP_ROUND = BufferParameters::CAP_ROUND,

                CAP_BUTT = BufferParameters::CAP_FLAT,

                CAP_SQUARE = BufferParameters::CAP_SQUARE
        };

        static geom::Geometry* bufferOp(const geom::Geometry *g,
                double distance,
                int quadrantSegments=
                        BufferParameters::DEFAULT_QUADRANT_SEGMENTS,
                int endCapStyle=BufferParameters::CAP_ROUND);

        BufferOp(const geom::Geometry *g)
                :
                argGeom(g),
                bufParams(),
                resultGeometry(NULL)
        {
        }

        BufferOp(const geom::Geometry* g, const BufferParameters& params)
                :
                argGeom(g),
                bufParams(params),
                resultGeometry(NULL)
        {
        }

        inline void setEndCapStyle(int nEndCapStyle);

        inline void setQuadrantSegments(int nQuadrantSegments);

        inline void setSingleSided(bool isSingleSided);

        geom::Geometry* getResultGeometry(double nDistance);
 
};
 
// 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
 
#endif // ndef GEOS_OP_BUFFER_BUFFEROP_H