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>

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 ()

Detailed Description

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

Constructor & Destructor Documentation

QgsCoordinateTransformCache::~QgsCoordinateTransformCache

(

)

Member Function Documentation

QgsCoordinateTransformCache * QgsCoordinateTransformCache::instance ( )

static

void QgsCoordinateTransformCache::invalidateCrs

(

const QString &

crsAuthId

)

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

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

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

• /tmp/buildd/qgis-2.6.0+wheezy1/src/core/qgscrscache.h
• /tmp/buildd/qgis-2.6.0+wheezy1/src/core/qgscrscache.cpp