This class contains information about how to simplify geometries fetched from a QgsFeatureIterator. More...

#include <qgssimplifymethod.h>

Public Types
enum	MethodType { NoSimplification, OptimizeForRendering, PreserveTopology }

Public Member Functions
	QgsSimplifyMethod ()
	construct a default method
	QgsSimplifyMethod (const QgsSimplifyMethod &rh)
	copy constructor
QgsSimplifyMethod &	operator= (const QgsSimplifyMethod &rh)
	assignment operator
void	setMethodType (MethodType methodType)
	Sets the simplification type.
MethodType	methodType () const
	Gets the simplification type.
void	setTolerance (double tolerance)
	Sets the tolerance of simplification. Represents the maximum distance between two coordinates which can be considered equal.
double	tolerance () const
	Gets the tolerance of simplification.
void	setForceLocalOptimization (bool localOptimization)
	Sets whether the simplification executes after fetch the geometries from provider, otherwise it executes, when supported, in provider before fetch the geometries.
bool	forceLocalOptimization () const
	Gets whether the simplification executes after fetch the geometries from provider, otherwise it executes, when supported, in provider before fetch the geometries.

Static Public Member Functions
static QgsAbstractGeometrySimplifier *	createGeometrySimplifier (const QgsSimplifyMethod &simplifyMethod)
	Creates a geometry simplifier according to specified method.

Protected Attributes
MethodType	mMethodType
	Simplification method.
double	mTolerance
	Tolerance of simplification, it represents the maximum distance between two coordinates which can be considered equal.
bool	mForceLocalOptimization
	Simplification executes after fetch the geometries from provider, otherwise it executes, when supported, in provider before fetch the geometries.

Detailed Description

This class contains information about how to simplify geometries fetched from a QgsFeatureIterator.

Note: added in 2.2

Definition at line 25 of file qgssimplifymethod.h.

Member Enumeration Documentation

enum QgsSimplifyMethod::MethodType

Enumerator:

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.

Definition at line 28 of file qgssimplifymethod.h.

Constructor & Destructor Documentation

QgsSimplifyMethod::QgsSimplifyMethod ( )

construct a default method

Definition at line 21 of file qgssimplifymethod.cpp.

QgsSimplifyMethod::QgsSimplifyMethod ( const QgsSimplifyMethod & rh )

copy constructor

Definition at line 28 of file qgssimplifymethod.cpp.

References operator=().

Member Function Documentation

QgsAbstractGeometrySimplifier * QgsSimplifyMethod::createGeometrySimplifier ( const QgsSimplifyMethod & simplifyMethod )

static

Creates a geometry simplifier according to specified method.

Definition at line 57 of file qgssimplifymethod.cpp.

References methodType(), OptimizeForRendering, PreserveTopology, QgsDebugMsg, QgsMapToPixelSimplifier::SimplifyEnvelope, QgsMapToPixelSimplifier::SimplifyGeometry, and tolerance().

Referenced by QgsVectorLayerFeatureIterator::prepareSimplification(), and QgsAbstractFeatureIterator::prepareSimplification().

bool QgsSimplifyMethod::forceLocalOptimization ( ) const

inline

Gets whether the simplification executes after fetch the geometries from provider, otherwise it executes, when supported, in provider before fetch the geometries.

Definition at line 55 of file qgssimplifymethod.h.

Referenced by QgsAbstractFeatureIterator::prepareSimplification().

MethodType QgsSimplifyMethod::methodType ( ) const

inline

Gets the simplification type.

Definition at line 45 of file qgssimplifymethod.h.

Referenced by createGeometrySimplifier(), QgsVectorLayerFeatureIterator::prepareSimplification(), QgsAbstractFeatureIterator::prepareSimplification(), and setMethodType().

QgsSimplifyMethod & QgsSimplifyMethod::operator= ( const QgsSimplifyMethod & rh )

assignment operator

Definition at line 33 of file qgssimplifymethod.cpp.

References mForceLocalOptimization, mMethodType, and mTolerance.

Referenced by QgsSimplifyMethod().

void QgsSimplifyMethod::setForceLocalOptimization ( bool localOptimization )

Sets whether the simplification executes after fetch the geometries from provider, otherwise it executes, when supported, in provider before fetch the geometries.

Definition at line 52 of file qgssimplifymethod.cpp.

References mForceLocalOptimization.

Referenced by QgsVectorLayer::draw().

void QgsSimplifyMethod::setMethodType ( MethodType methodType )

Sets the simplification type.

Definition at line 42 of file qgssimplifymethod.cpp.

References methodType(), and mMethodType.

Referenced by QgsVectorLayer::draw().

void QgsSimplifyMethod::setTolerance ( double tolerance )

Sets the tolerance of simplification. Represents the maximum distance between two coordinates which can be considered equal.

Definition at line 47 of file qgssimplifymethod.cpp.

References mTolerance, and tolerance().