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. More...
void	invalidateCrs (const QString &crsAuthId)
	Removes transformations where a changed crs is involved from the cache. More...

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 QgsCRSCache::updateCRSCache().

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.

Referenced by QgsCRSCache::updateCRSCache().

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 QgsCRSCache::crsByAuthId(), QgsCRSCache::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:

• /build/buildd/qgis-2.0.1/src/core/qgscrscache.h
• /build/buildd/qgis-2.0.1/src/core/qgscrscache.cpp