QGIS API Documentation  2.18.21-Las Palmas (9fba24a)
Public Member Functions | Static Public Member Functions | List of all members
QgsCoordinateTransformCache Class Reference

Cache coordinate transform by authid of source/dest transformation to avoid the overhead of initialization 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 QgsCoordinateTransformCacheinstance ()
 

Detailed Description

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

Definition at line 30 of file qgscrscache.h.

Constructor & Destructor Documentation

◆ ~QgsCoordinateTransformCache()

QgsCoordinateTransformCache::~QgsCoordinateTransformCache ( )

Definition at line 32 of file qgscrscache.cpp.

Member Function Documentation

◆ instance()

QgsCoordinateTransformCache * QgsCoordinateTransformCache::instance ( )
static

Definition at line 22 of file qgscrscache.cpp.

◆ invalidateCrs()

void QgsCoordinateTransformCache::invalidateCrs ( const QString crsAuthId)

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

Definition at line 68 of file qgscrscache.cpp.

◆ transform()

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 41 of file qgscrscache.cpp.


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