QgsSimplifyMethod Class Reference

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 ()=default
	construct a default method More...
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. More...
MethodType	methodType () const
	Gets the simplification type. More...
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. More...
void	setMethodType (MethodType methodType)
	Sets the simplification type. More...
void	setThreshold (float threshold)
	Sets the simplification threshold in pixels. Represents the maximum distance in pixels between two coordinates which can be considered equal. More...
void	setTolerance (double tolerance)
	Sets the tolerance of simplification in map units. Represents the maximum distance in map units between two coordinates which can be considered equal. More...
float	threshold () const
	Gets the simplification threshold in pixels. Represents the maximum distance in pixels between two coordinates which can be considered equal. More...
double	tolerance () const
	Gets the tolerance of simplification in map units. Represents the maximum distance in map units between two coordinates which can be considered equal. More...

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

Protected Attributes
bool	mForceLocalOptimization = true
	Simplification executes after fetch the geometries from provider, otherwise it executes, when supported, in provider before fetch the geometries. More...
MethodType	mMethodType = QgsSimplifyMethod::NoSimplification
	Simplification method. More...
float	mThreshold = 1
	Simplification threshold. More...
double	mTolerance = 1
	Simplification tolerance, it represents the maximum distance between two coordinates which can be considered equal. More...

Detailed Description

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

Since

QGIS 2.2

Definition at line 28 of file qgssimplifymethod.h.

Member Enumeration Documentation

MethodType

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 31 of file qgssimplifymethod.h.

Constructor & Destructor Documentation

QgsSimplifyMethod()

QgsSimplifyMethod::QgsSimplifyMethod ( )

default

construct a default method

Member Function Documentation

createGeometrySimplifier()

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

static

Creates a geometry simplifier according to specified method.

Definition at line 37 of file qgssimplifymethod.cpp.

forceLocalOptimization()

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 59 of file qgssimplifymethod.h.

methodType()

MethodType QgsSimplifyMethod::methodType ( ) const

inline

Gets the simplification type.

Definition at line 44 of file qgssimplifymethod.h.

setForceLocalOptimization()

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 32 of file qgssimplifymethod.cpp.

setMethodType()

void QgsSimplifyMethod::setMethodType

(

MethodType

methodType

)

Sets the simplification type.

Definition at line 22 of file qgssimplifymethod.cpp.

setThreshold()

void QgsSimplifyMethod::setThreshold ( float  threshold )

inline

Sets the simplification threshold in pixels. Represents the maximum distance in pixels between two coordinates which can be considered equal.

Definition at line 52 of file qgssimplifymethod.h.

setTolerance()

void QgsSimplifyMethod::setTolerance

(

double

tolerance

)

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

Definition at line 27 of file qgssimplifymethod.cpp.

threshold()

float QgsSimplifyMethod::threshold ( ) const

inline

Gets the simplification threshold in pixels. Represents the maximum distance in pixels between two coordinates which can be considered equal.

Definition at line 54 of file qgssimplifymethod.h.

tolerance()

double QgsSimplifyMethod::tolerance ( ) const

inline

Gets the tolerance of simplification in map units. Represents the maximum distance in map units between two coordinates which can be considered equal.

Definition at line 49 of file qgssimplifymethod.h.

Member Data Documentation

mForceLocalOptimization

bool QgsSimplifyMethod::mForceLocalOptimization = true

protected

Simplification executes after fetch the geometries from provider, otherwise it executes, when supported, in provider before fetch the geometries.

Definition at line 72 of file qgssimplifymethod.h.

mMethodType

MethodType QgsSimplifyMethod::mMethodType = QgsSimplifyMethod::NoSimplification

protected

Simplification method.

Definition at line 66 of file qgssimplifymethod.h.

mThreshold

float QgsSimplifyMethod::mThreshold = 1

protected

Simplification threshold.

Definition at line 70 of file qgssimplifymethod.h.

mTolerance

double QgsSimplifyMethod::mTolerance = 1

protected

Simplification tolerance, it represents the maximum distance between two coordinates which can be considered equal.

Definition at line 68 of file qgssimplifymethod.h.

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The documentation for this class was generated from the following files:

• /tmp/buildd/qgis-3.6.0+99unstable/src/core/qgssimplifymethod.h
• /tmp/buildd/qgis-3.6.0+99unstable/src/core/qgssimplifymethod.cpp