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:

List of all members.

Public Member Functions
	~QgsCoordinateTransformCache ()
void	invalidateCrs (const QString &crsAuthId)
	Removes transformations where a changed crs is involved from the cache.
const QgsCoordinateTransform *	transform (const QString &srcAuthId, const QString &destAuthId)
	Returns coordinate transformation.
Static Public Member Functions
static QgsCoordinateTransformCache *	instance ()
Private Attributes
QHash< QPair< QString, QString > , QgsCoordinateTransform * >	mTransforms
Static Private Attributes
static QgsCoordinateTransformCache *	mInstance = 0

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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.

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Constructor & Destructor Documentation

QgsCoordinateTransformCache::~QgsCoordinateTransformCache

(

)

Definition at line 32 of file qgscrscache.cpp.

References mInstance, and mTransforms.

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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().

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Member Data Documentation

QgsCoordinateTransformCache * QgsCoordinateTransformCache::mInstance = 0 [static, private]

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:

• src/core/qgscrscache.h
• src/core/qgscrscache.cpp