You cannot select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
103 lines
2.7 KiB
C++
103 lines
2.7 KiB
C++
/**********************************************************************
|
|
*
|
|
* GEOS - Geometry Engine Open Source
|
|
* http://geos.osgeo.org
|
|
*
|
|
* Copyright (C) 2006 Refractions Research Inc.
|
|
*
|
|
* This is free software; you can redistribute and/or modify it under
|
|
* the terms of the GNU Lesser General Licence as published
|
|
* by the Free Software Foundation.
|
|
* See the COPYING file for more information.
|
|
*
|
|
**********************************************************************
|
|
*
|
|
* Last port: simplify/DouglasPeuckerLineSimplifier.java rev. 1.4
|
|
*
|
|
**********************************************************************/
|
|
|
|
#ifndef GEOS_SIMPLIFY_DOUBGLASPEUCKERLINESIMPLIFIER_H
|
|
#define GEOS_SIMPLIFY_DOUBGLASPEUCKERLINESIMPLIFIER_H
|
|
|
|
#include <geos/export.h>
|
|
#include <vector>
|
|
#include <memory> // for unique_ptr
|
|
|
|
#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 Coordinate;
|
|
}
|
|
}
|
|
|
|
namespace geos {
|
|
namespace simplify { // geos::simplify
|
|
|
|
/** \brief
|
|
* Simplifies a linestring (sequence of points) using
|
|
* the standard Douglas-Peucker algorithm.
|
|
*/
|
|
class GEOS_DLL DouglasPeuckerLineSimplifier {
|
|
|
|
public:
|
|
|
|
typedef std::vector<short int> BoolVect;
|
|
typedef std::unique_ptr<BoolVect> BoolVectAutoPtr;
|
|
|
|
typedef std::vector<geom::Coordinate> CoordsVect;
|
|
typedef std::unique_ptr<CoordsVect> CoordsVectAutoPtr;
|
|
|
|
|
|
/** \brief
|
|
* Returns a newly allocated Coordinate vector, wrapped
|
|
* into an unique_ptr
|
|
*/
|
|
static CoordsVectAutoPtr simplify(
|
|
const CoordsVect& nPts,
|
|
double distanceTolerance);
|
|
|
|
DouglasPeuckerLineSimplifier(const CoordsVect& nPts);
|
|
|
|
/** \brief
|
|
* Sets the distance tolerance for the simplification.
|
|
*
|
|
* All vertices in the simplified linestring will be within this
|
|
* distance of the original linestring.
|
|
*
|
|
* @param nDistanceTolerance the approximation tolerance to use
|
|
*/
|
|
void setDistanceTolerance(double nDistanceTolerance);
|
|
|
|
/** \brief
|
|
* Returns a newly allocated Coordinate vector, wrapped
|
|
* into an unique_ptr
|
|
*/
|
|
CoordsVectAutoPtr simplify();
|
|
|
|
private:
|
|
|
|
const CoordsVect& pts;
|
|
BoolVectAutoPtr usePt;
|
|
double distanceTolerance;
|
|
|
|
void simplifySection(std::size_t i, std::size_t j);
|
|
|
|
// Declare type as noncopyable
|
|
DouglasPeuckerLineSimplifier(const DouglasPeuckerLineSimplifier& other) = delete;
|
|
DouglasPeuckerLineSimplifier& operator=(const DouglasPeuckerLineSimplifier& rhs) = delete;
|
|
};
|
|
|
|
} // namespace geos::simplify
|
|
} // namespace geos
|
|
|
|
#ifdef _MSC_VER
|
|
#pragma warning(pop)
|
|
#endif
|
|
|
|
#endif // GEOS_SIMPLIFY_DOUBGLASPEUCKERLINESIMPLIFIER_H
|