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

Public Member Functions
	~QgsCoordinateTransformCache ()

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

const QgsCoordinateTransform *	transform (const QString &srcAuthId, const QString &destAuthId, int srcDatumTransform=-1, int destDatumTransform=-1)
	Returns coordinate transformation. More...

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.

Definition at line 28 of file qgscrscache.h.

Constructor & Destructor Documentation

QgsCoordinateTransformCache::~QgsCoordinateTransformCache ( )

Definition at line 28 of file qgscrscache.cpp.

QgsCoordinateTransformCache * QgsCoordinateTransformCache::instance ( )

static

Definition at line 22 of file qgscrscache.cpp.

void QgsCoordinateTransformCache::invalidateCrs ( const QString & crsAuthId )

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

Definition at line 64 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 37 of file qgscrscache.cpp.

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