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

Inheritance diagram for QgsCoordinateTransformCache:

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, int srcDatumTransform=-1, int destDatumTransform=-1)
	Returns coordinate transformation.

Additional Inherited Members
Static Public Member Functions inherited from QgsSingleton< QgsCoordinateTransformCache >
static void	cleanup ()
static QgsCoordinateTransformCache *	instance ()
Protected Member Functions inherited from QgsSingleton< QgsCoordinateTransformCache >
	QgsSingleton ()
virtual	~QgsSingleton ()

Detailed Description

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

Definition at line 29 of file qgscrscache.h.

Constructor & Destructor Documentation

QgsCoordinateTransformCache::~QgsCoordinateTransformCache ( )

Definition at line 21 of file qgscrscache.cpp.

void QgsCoordinateTransformCache::invalidateCrs ( const QString & crsAuthId )

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

Definition at line 59 of file qgscrscache.cpp.

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 32 of file qgscrscache.cpp.

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