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

Member Function Documentation

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 62 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
srcAuthIdauth id string of source crs
destAuthIdauth id string of dest crs
srcDatumTransformid of source's datum transform
destDatumTransformid of destinations's datum transform

Definition at line 37 of file qgscrscache.cpp.


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