QgsCoordinateTransformCache Class Reference

Cache coordinate transform by authid of source/dest transformation to avoid the overhead of initialisation for each redraw. More...

#include <qgscrscache.h>

Collaboration diagram for QgsCoordinateTransformCache:

Public Member Functions
	~QgsCoordinateTransformCache ()
const QgsCoordinateTransform *	transform (const QString &srcAuthId, const QString &destAuthId, int srcDatumTransform=-1, int destDatumTransform=-1)
	Returns coordinate transformation.
void	invalidateCrs (const QString &crsAuthId)
	Removes transformations where a changed crs is involved from the cache.

Static Public Member Functions
static QgsCoordinateTransformCache *	instance ()

Private Attributes
QMultiHash< QPair< QString, QString > , QgsCoordinateTransform * >	mTransforms

Static Private Attributes
static QgsCoordinateTransformCache *	mInstance

Detailed Description

Cache coordinate transform by authid of source/dest transformation to avoid the overhead of initialisation for each redraw.

Definition at line 28 of file qgscrscache.h.

Constructor & Destructor Documentation

QgsCoordinateTransformCache::~QgsCoordinateTransformCache

(

)

Definition at line 28 of file qgscrscache.cpp.

References mTransforms.

Member Function Documentation

QgsCoordinateTransformCache * QgsCoordinateTransformCache::instance ( )

static

Definition at line 22 of file qgscrscache.cpp.

References mInstance.

Referenced by QgsRasterProjector::block(), QgsRasterProjector::calc(), transform(), and QgsMapRenderer::transformation().

void QgsCoordinateTransformCache::invalidateCrs

(

const QString &

crsAuthId

)

Removes transformations where a changed crs is involved from the cache.

Definition at line 62 of file qgscrscache.cpp.

References mTransforms.

const QgsCoordinateTransform * QgsCoordinateTransformCache::transform	(	const QString &	srcAuthId,
		const QString &	destAuthId,
		int	srcDatumTransform = -1,
		int	destDatumTransform = -1
	)

Returns coordinate transformation.

Cache keeps ownership

Parameters

srcAuthId	auth id string of source crs
destAuthId	auth id string of dest crs
srcDatumTransform	id of source's datum transform
destDatumTransform	id of destinations's datum transform

Definition at line 37 of file qgscrscache.cpp.

References QgsCoordinateTransform::initialise(), instance(), mTransforms, QgsCoordinateTransform::setDestinationDatumTransform(), and QgsCoordinateTransform::setSourceDatumTransform().

Referenced by QgsRasterProjector::block(), QgsRasterProjector::calc(), and QgsMapRenderer::transformation().

Member Data Documentation

QgsCoordinateTransformCache* QgsCoordinateTransformCache::mInstance

staticprivate

Definition at line 44 of file qgscrscache.h.

Referenced by instance().

QMultiHash< QPair< QString, QString >, QgsCoordinateTransform* > QgsCoordinateTransformCache::mTransforms

private

Definition at line 45 of file qgscrscache.h.

Referenced by invalidateCrs(), transform(), and ~QgsCoordinateTransformCache().

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

• /tmp/buildd/qgis-2.2.0+wheezy1/src/core/qgscrscache.h
• /tmp/buildd/qgis-2.2.0+wheezy1/src/core/qgscrscache.cpp