QgsPALObjectPositionManager Class Reference

A class that uses the PAL library for overlay object placement. More...

#include <qgspalobjectpositionmanager.h>

Inheritance diagram for QgsPALObjectPositionManager:

Collaboration diagram for QgsPALObjectPositionManager:

List of all members.

Public Member Functions
	QgsPALObjectPositionManager ()
	~QgsPALObjectPositionManager ()
void	addLayer (QgsVectorLayer *vl, QList< QgsVectorOverlay * > &overlays)
	Adds a layer that may contain * overlays to the position manager.
void	findObjectPositions (const QgsRenderContext &renderContext, QGis::UnitType unitType)
	Calculate positions for the overlay objects.
void	removeLayers ()
	Removes all the layers.
void	setPlacementAlgorithm (const QString &algorithmName)
	Sets algorithm used for object placements.
Public Member Functions inherited from QgsOverlayObjectPositionManager
virtual	~QgsOverlayObjectPositionManager ()

Private Member Functions
void	deletePALGeometries ()

Private Attributes
pal::Pal	mPositionEngine
int	mNumberOfLayers
QList< QgsPALGeometry * >	mPALGeometries
	Internal storage of the pal geometries between addLayer and findObjectPositions operations.

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Detailed Description

A class that uses the PAL library for overlay object placement.

Note:

This class has been added in version 1.1

Definition at line 29 of file qgspalobjectpositionmanager.h.

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Constructor & Destructor Documentation

QgsPALObjectPositionManager::QgsPALObjectPositionManager

(

)

Definition at line 30 of file qgspalobjectpositionmanager.cpp.

QgsPALObjectPositionManager::~QgsPALObjectPositionManager

(

)

Definition at line 35 of file qgspalobjectpositionmanager.cpp.

References deletePALGeometries().

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Member Function Documentation

void QgsPALObjectPositionManager::addLayer ( QgsVectorLayer *  vl, QList< QgsVectorOverlay * > &  overlays  )

virtual

Adds a layer that may contain * overlays to the position manager.

The overlay objects contained in the overlays will then be considered in label placement

Implements QgsOverlayObjectPositionManager.

Definition at line 40 of file qgspalobjectpositionmanager.cpp.

References QgsVectorLayer::geometryType(), QGis::Line, mNumberOfLayers, mPALGeometries, mPositionEngine, QGis::Point, and QGis::Polygon.

void QgsPALObjectPositionManager::deletePALGeometries ( )

private

Definition at line 227 of file qgspalobjectpositionmanager.cpp.

References mPALGeometries.

Referenced by findObjectPositions(), and ~QgsPALObjectPositionManager().

void QgsPALObjectPositionManager::findObjectPositions ( const QgsRenderContext &  context, QGis::UnitType  unitType  )

virtual

Calculate positions for the overlay objects.

Parameters:

context	Context of rendering operation (Painter, scale factor)
unitType	meters, feet, degrees

Implements QgsOverlayObjectPositionManager.

Definition at line 100 of file qgspalobjectpositionmanager.cpp.

References QgsOverlayObject::addPosition(), QgsRenderContext::coordinateTransform(), QGis::Degrees, deletePALGeometries(), QgsRenderContext::extent(), QGis::Feet, QGis::Meters, mPositionEngine, QgsPALGeometry::overlayObjectPtr(), QgsRenderContext::rendererScale(), QgsRenderContext::scaleFactor(), QgsCoordinateTransform::transformBoundingBox(), QgsRectangle::xMaximum(), QgsRectangle::xMinimum(), QgsRectangle::yMaximum(), and QgsRectangle::yMinimum().

void QgsPALObjectPositionManager::removeLayers ( )

virtual

Removes all the layers.

Implements QgsOverlayObjectPositionManager.

Definition at line 183 of file qgspalobjectpositionmanager.cpp.

References mPositionEngine.

void QgsPALObjectPositionManager::setPlacementAlgorithm

(

const QString &

algorithmName

)

Sets algorithm used for object placements.

Possibilities are: Chain, Popmusic tabu chain, Popmusic tabu, Popmusic chain

Definition at line 207 of file qgspalobjectpositionmanager.cpp.

References mPositionEngine.

Referenced by QgsMapRenderer::overlayManagerFromSettings().

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Member Data Documentation

int QgsPALObjectPositionManager::mNumberOfLayers

private

Definition at line 44 of file qgspalobjectpositionmanager.h.

Referenced by addLayer().

QList<QgsPALGeometry*> QgsPALObjectPositionManager::mPALGeometries

private

Internal storage of the pal geometries between addLayer and findObjectPositions operations.

Definition at line 46 of file qgspalobjectpositionmanager.h.

Referenced by addLayer(), and deletePALGeometries().

pal::Pal QgsPALObjectPositionManager::mPositionEngine

private

Definition at line 43 of file qgspalobjectpositionmanager.h.

Referenced by addLayer(), findObjectPositions(), removeLayers(), and setPlacementAlgorithm().

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

• /build/buildd/qgis-1.7.4+1.7.5~20120320/src/core/qgspalobjectpositionmanager.h
• /build/buildd/qgis-1.7.4+1.7.5~20120320/src/core/qgspalobjectpositionmanager.cpp