/usr/include/qgis/qgssimplifymethod.h is in libqgis-dev 2.8.6+dfsg-1build1.
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qgssimplifymethod.h
---------------------
begin : December 2013
copyright : (C) 2013 by Matthias Kuhn / Alvaro Huarte
email :
***************************************************************************
* *
* This program is free software; you can redistribute it and/or modify *
* it under the terms of the GNU General Public License as published by *
* the Free Software Foundation; either version 2 of the License, or *
* (at your option) any later version. *
* *
***************************************************************************/
#ifndef QGSSIMPLIFYMETHOD_H
#define QGSSIMPLIFYMETHOD_H
class QgsAbstractGeometrySimplifier;
/**
* This class contains information about how to simplify geometries fetched from a QgsFeatureIterator
* @note added in 2.2
*/
class CORE_EXPORT QgsSimplifyMethod
{
public:
enum MethodType
{
NoSimplification, //!< No simplification is applied
OptimizeForRendering, //!< Simplify using the map2pixel data to optimize the rendering of geometries
PreserveTopology //!< Simplify using the Douglas-Peucker algorithm ensuring that the result is a valid geometry
};
//! construct a default method
QgsSimplifyMethod();
//! copy constructor
QgsSimplifyMethod( const QgsSimplifyMethod& rh );
//! assignment operator
QgsSimplifyMethod& operator=( const QgsSimplifyMethod& rh );
//! Sets the simplification type
void setMethodType( MethodType methodType );
//! Gets the simplification type
inline MethodType methodType() const { return mMethodType; }
//! Sets the tolerance of simplification. Represents the maximum distance between two coordinates which can be considered equal
void setTolerance( double tolerance );
//! Gets the tolerance of simplification
inline double tolerance() const { return mTolerance; }
//! Sets whether the simplification executes after fetch the geometries from provider, otherwise it executes, when supported, in provider before fetch the geometries
void setForceLocalOptimization( bool localOptimization );
//! Gets whether the simplification executes after fetch the geometries from provider, otherwise it executes, when supported, in provider before fetch the geometries
inline bool forceLocalOptimization() const { return mForceLocalOptimization; }
//! Creates a geometry simplifier according to specified method
static QgsAbstractGeometrySimplifier* createGeometrySimplifier( const QgsSimplifyMethod& simplifyMethod );
protected:
//! Simplification method
MethodType mMethodType;
//! Tolerance of simplification, it represents the maximum distance between two coordinates which can be considered equal
double mTolerance;
//! Simplification executes after fetch the geometries from provider, otherwise it executes, when supported, in provider before fetch the geometries
bool mForceLocalOptimization;
};
#endif // QGSSIMPLIFYMETHOD_H
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