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)
	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
QHash< QPair< QString, QString > , QgsCoordinateTransform * >	mTransforms

Static Private Attributes
static QgsCoordinateTransformCache *	mInstance = 0

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 32 of file qgscrscache.cpp.

References mInstance, and mTransforms.

Member Function Documentation

QgsCoordinateTransformCache * QgsCoordinateTransformCache::instance ( )

static

Definition at line 23 of file qgscrscache.cpp.

References mInstance.

Referenced by QgsMapRenderer::render(), QgsMapRenderer::tr(), and transform().

void QgsCoordinateTransformCache::invalidateCrs

(

const QString &

crsAuthId

)

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

Definition at line 60 of file qgscrscache.cpp.

References mTransforms.

const QgsCoordinateTransform * QgsCoordinateTransformCache::transform	(	const QString &	srcAuthId,
		const QString &	destAuthId
	)

Returns coordinate transformation.

Cache keeps ownership

Parameters

srcAuthId	auth id string of source crs
destAuthId	auth id string of dest crs

Definition at line 42 of file qgscrscache.cpp.

References instance(), and mTransforms.

Referenced by QgsMapRenderer::render(), and QgsMapRenderer::tr().

Member Data Documentation

QgsCoordinateTransformCache * QgsCoordinateTransformCache::mInstance = 0

staticprivate

Definition at line 41 of file qgscrscache.h.

Referenced by instance(), and ~QgsCoordinateTransformCache().

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

private

Definition at line 42 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-2.0.1/src/core/qgscrscache.h
• /tmp/buildd/qgis-2.0.1/src/core/qgscrscache.cpp