/usr/include/qgis/qgsmaptopixelgeometrysimplifier.h is in libqgis-dev 2.14.11+dfsg-3+deb9u1.
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qgsmaptopixelgeometrysimplifier.h
---------------------
begin : December 2013
copyright : (C) 2013 by Alvaro Huarte
email : http://wiki.osgeo.org/wiki/Alvaro_Huarte
***************************************************************************
* *
* 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 QGSMAPTOPIXELGEOMETRYSIMPLIFIER_H
#define QGSMAPTOPIXELGEOMETRYSIMPLIFIER_H
#include "qgsgeometry.h"
#include "qgscoordinatetransform.h"
#include "qgsmaptopixel.h"
#include "qgsgeometrysimplifier.h"
/**
* Implementation of GeometrySimplifier using the "MapToPixel" algorithm
*
* Simplifies a geometry removing points within of the maximum distance difference that defines the MapToPixel info of a RenderContext request.
* This class enables simplify the geometries to be rendered in a MapCanvas target to speed up the vector drawing.
*/
class CORE_EXPORT QgsMapToPixelSimplifier : public QgsAbstractGeometrySimplifier
{
public:
QgsMapToPixelSimplifier( int simplifyFlags, double tolerance );
virtual ~QgsMapToPixelSimplifier();
//! Applicable simplification flags
enum SimplifyFlag
{
NoFlags = 0, //!< No simplification can be applied
SimplifyGeometry = 1, //!< The geometries can be simplified using the current map2pixel context state
SimplifyEnvelope = 2, //!< The geometries can be fully simplified by its BoundingBox
};
private:
//! Simplify the WKB-geometry using the specified tolerance
static bool simplifyWkbGeometry( int simplifyFlags, QGis::WkbType wkbType, QgsConstWkbPtr sourceWkbPtr, QgsWkbPtr targetWkbPtr, int &targetWkbSize, const QgsRectangle& envelope, double map2pixelTol, bool writeHeader = true, bool isaLinearRing = false );
protected:
//! Current simplification flags
int mSimplifyFlags;
//! Distance tolerance for the simplification
double mTolerance;
//! Returns the squared 2D-distance of the vector defined by the two points specified
static float calculateLengthSquared2D( double x1, double y1, double x2, double y2 );
public:
int simplifyFlags() const { return mSimplifyFlags; }
void setSimplifyFlags( int simplifyFlags ) { mSimplifyFlags = simplifyFlags; }
//! Returns a simplified version the specified geometry
virtual QgsGeometry* simplify( QgsGeometry* geometry ) const override;
//! Simplifies the specified geometry
virtual bool simplifyGeometry( QgsGeometry* geometry ) const override;
// MapToPixel simplification helper methods
public:
//! Returns whether the envelope can be replaced by its BBOX when is applied the specified map2pixel context
static bool isGeneralizableByMapBoundingBox( const QgsRectangle& envelope, double map2pixelTol );
//! Returns whether the envelope can be replaced by its BBOX when is applied the specified map2pixel context
inline bool isGeneralizableByMapBoundingBox( const QgsRectangle& envelope ) const
{
return isGeneralizableByMapBoundingBox( envelope, mTolerance );
}
//! Simplifies the geometry when is applied the specified map2pixel context
static bool simplifyGeometry( QgsGeometry* geometry, int simplifyFlags, double tolerance );
};
#endif // QGSMAPTOPIXELGEOMETRYSIMPLIFIER_H
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