Fix missing transform contexts for QgsDistanceArea

QgsDistanceArea.setSourceCrs() now requires a QgsTransformContext argument.
qgis · Dec 20, 2017 · 4643712 · 4643712
1 parent 6528f1c
commit 4643712
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Showing 44 changed files with 84 additions and 78 deletions.
diff --git a/doc/api_break.dox b/doc/api_break.dox
@@ -1128,7 +1128,8 @@ ellipsoid to 'NONE' to disable ellipsoidal calculations.
 - ellipsoidalEnabled() was removed. Ellipsoidal calculations are now enabled whenever a valid ellipsoid() is set. Check
 willUseEllipsoid() to determine whether ellipsoidal calculations will be performed.
 - sourceCrs() now returns a QgsCoordinateReferenceSystem instead of the crs ID.
-- setSourceCrs() now requires a QgsCoordinateReferenceSystem instead of crs ID.
+- setSourceCrs() now requires a QgsCoordinateReferenceSystem instead of crs ID, and requires a QgsCoordinateTransformContext object. PyQGIS code
+can use QgsProject.instance().transformContext() for the QgsCoordinateTransformContext argument.
 - setSourceAuthId() was removed. Use setSourceCrs() instead.
 - geographic() was removed. Check sourceCrs().isGeographic() instead.
 - measure() has been removed. Use measureArea() or measureLength() instead.

diff --git a/python/core/qgsdistancearea.sip b/python/core/qgsdistancearea.sip
@@ -50,9 +50,9 @@ ellipsoid if a valid ellipsoid() has been set.
 .. seealso:: :py:func:`ellipsoid()`
 %End
 
-    void setSourceCrs( const QgsCoordinateReferenceSystem &srcCRS );
+    void setSourceCrs( const QgsCoordinateReferenceSystem &crs, const QgsCoordinateTransformContext &context );
 %Docstring
-Sets source spatial reference system.
+Sets source spatial reference system ``crs``.
 
 .. versionadded:: 2.2
 

diff --git a/python/gui/qgsattributeeditorcontext.sip b/python/gui/qgsattributeeditorcontext.sip
@@ -10,7 +10,6 @@
 
 
 
-
 class QgsAttributeEditorContext
 {
 %Docstring

diff --git a/python/plugins/processing/algs/qgis/Aggregate.py b/python/plugins/processing/algs/qgis/Aggregate.py
@@ -135,7 +135,7 @@ def prepareAlgorithm(self, parameters, context, feedback):
         aggregates = self.parameterAsAggregates(parameters, self.AGGREGATES, context)
 
         da = QgsDistanceArea()
-        da.setSourceCrs(source.sourceCrs())
+        da.setSourceCrs(source.sourceCrs(), context.transformContext())
         da.setEllipsoid(context.project().ellipsoid())
 
         self.source = source

diff --git a/python/plugins/processing/algs/qgis/ExportGeometryInfo.py b/python/plugins/processing/algs/qgis/ExportGeometryInfo.py
@@ -123,7 +123,7 @@ def processAlgorithm(self, parameters, context, feedback):
 
         self.distance_area = QgsDistanceArea()
         if method == 2:
-            self.distance_area.setSourceCrs(source.sourceCrs())
+            self.distance_area.setSourceCrs(source.sourceCrs(), context.transformContext())
             self.distance_area.setEllipsoid(context.project().ellipsoid())
         elif method == 1:
             coordTransform = QgsCoordinateTransform(source.sourceCrs(), context.project().crs(), context.project())

diff --git a/python/plugins/processing/algs/qgis/FieldsCalculator.py b/python/plugins/processing/algs/qgis/FieldsCalculator.py
@@ -104,7 +104,7 @@ def processAlgorithm(self, parameters, context, feedback):
 
         expression = QgsExpression(formula)
         da = QgsDistanceArea()
-        da.setSourceCrs(source.sourceCrs())
+        da.setSourceCrs(source.sourceCrs(), context.transformContext())
         da.setEllipsoid(context.project().ellipsoid())
         expression.setGeomCalculator(da)
 

diff --git a/python/plugins/processing/algs/qgis/FieldsMapper.py b/python/plugins/processing/algs/qgis/FieldsMapper.py
@@ -121,7 +121,7 @@ def prepareAlgorithm(self, parameters, context, feedback):
         self.expressions = []
 
         da = QgsDistanceArea()
-        da.setSourceCrs(source.sourceCrs())
+        da.setSourceCrs(source.sourceCrs(), context.transformContext())
         da.setEllipsoid(context.project().ellipsoid())
 
         # create an expression context using thread safe processing context

diff --git a/python/plugins/processing/algs/qgis/HubDistanceLines.py b/python/plugins/processing/algs/qgis/HubDistanceLines.py
@@ -117,7 +117,7 @@ def processAlgorithm(self, parameters, context, feedback):
         index = QgsSpatialIndex(hub_source.getFeatures(QgsFeatureRequest().setSubsetOfAttributes([]).setDestinationCrs(point_source.sourceCrs(), context.transformContext())))
 
         distance = QgsDistanceArea()
-        distance.setSourceCrs(point_source.sourceCrs())
+        distance.setSourceCrs(point_source.sourceCrs(), context.transformContext())
         distance.setEllipsoid(context.project().ellipsoid())
 
         # Scan source points, find nearest hub, and write to output file

diff --git a/python/plugins/processing/algs/qgis/HubDistancePoints.py b/python/plugins/processing/algs/qgis/HubDistancePoints.py
@@ -113,7 +113,7 @@ def processAlgorithm(self, parameters, context, feedback):
         index = QgsSpatialIndex(hub_source.getFeatures(QgsFeatureRequest().setSubsetOfAttributes([]).setDestinationCrs(point_source.sourceCrs(), context.transformContext())))
 
         distance = QgsDistanceArea()
-        distance.setSourceCrs(point_source.sourceCrs())
+        distance.setSourceCrs(point_source.sourceCrs(), context.transformContext())
         distance.setEllipsoid(context.project().ellipsoid())
 
         # Scan source points, find nearest hub, and write to output file

diff --git a/python/plugins/processing/algs/qgis/NearestNeighbourAnalysis.py b/python/plugins/processing/algs/qgis/NearestNeighbourAnalysis.py
@@ -98,7 +98,7 @@ def processAlgorithm(self, parameters, context, feedback):
         spatialIndex = QgsSpatialIndex(source, feedback)
 
         distance = QgsDistanceArea()
-        distance.setSourceCrs(source.sourceCrs())
+        distance.setSourceCrs(source.sourceCrs(), context.transformContext())
         distance.setEllipsoid(context.project().ellipsoid())
 
         sumDist = 0.00

diff --git a/python/plugins/processing/algs/qgis/PointDistance.py b/python/plugins/processing/algs/qgis/PointDistance.py
@@ -157,7 +157,7 @@ def linearMatrix(self, parameters, context, source, inField, target_source, targ
         index = QgsSpatialIndex(target_source.getFeatures(QgsFeatureRequest().setSubsetOfAttributes([]).setDestinationCrs(source.sourceCrs(), context.transformContext())), feedback)
 
         distArea = QgsDistanceArea()
-        distArea.setSourceCrs(source.sourceCrs())
+        distArea.setSourceCrs(source.sourceCrs(), context.transformContext())
         distArea.setEllipsoid(context.project().ellipsoid())
 
         features = source.getFeatures(QgsFeatureRequest().setSubsetOfAttributes([inIdx]))
@@ -208,7 +208,7 @@ def linearMatrix(self, parameters, context, source, inField, target_source, targ
     def regularMatrix(self, parameters, context, source, inField, target_source, targetField,
                       nPoints, feedback):
         distArea = QgsDistanceArea()
-        distArea.setSourceCrs(source.sourceCrs())
+        distArea.setSourceCrs(source.sourceCrs(), context.transformContext())
         distArea.setEllipsoid(context.project().ellipsoid())
 
         inIdx = source.fields().lookupField(inField)

diff --git a/python/plugins/processing/algs/qgis/PointsToPaths.py b/python/plugins/processing/algs/qgis/PointsToPaths.py
@@ -153,7 +153,7 @@ def processAlgorithm(self, parameters, context, feedback):
         feedback.setProgress(0)
 
         da = QgsDistanceArea()
-        da.setSourceCrs(source.sourceCrs())
+        da.setSourceCrs(source.sourceCrs(), context.transformContext())
         da.setEllipsoid(context.project().ellipsoid())
 
         current = 0

diff --git a/python/plugins/processing/algs/qgis/RandomPointsAlongLines.py b/python/plugins/processing/algs/qgis/RandomPointsAlongLines.py
@@ -109,7 +109,7 @@ def processAlgorithm(self, parameters, context, feedback):
         points = dict()
 
         da = QgsDistanceArea()
-        da.setSourceCrs(source.sourceCrs())
+        da.setSourceCrs(source.sourceCrs(), context.transformContext())
         da.setEllipsoid(context.project().ellipsoid())
 
         request = QgsFeatureRequest()

diff --git a/python/plugins/processing/algs/qgis/RandomPointsPolygons.py b/python/plugins/processing/algs/qgis/RandomPointsPolygons.py
@@ -127,7 +127,7 @@ def processAlgorithm(self, parameters, context, feedback):
                                                fields, QgsWkbTypes.Point, source.sourceCrs())
 
         da = QgsDistanceArea()
-        da.setSourceCrs(source.sourceCrs())
+        da.setSourceCrs(source.sourceCrs(), context.transformContext())
         da.setEllipsoid(context.project().ellipsoid())
 
         total = 100.0 / source.featureCount() if source.featureCount() else 0

diff --git a/python/plugins/processing/algs/qgis/SumLines.py b/python/plugins/processing/algs/qgis/SumLines.py
@@ -107,7 +107,7 @@ def processAlgorithm(self, parameters, context, feedback):
             QgsFeatureRequest().setSubsetOfAttributes([]).setDestinationCrs(poly_source.sourceCrs(), context.transformContext())), feedback)
 
         distArea = QgsDistanceArea()
-        distArea.setSourceCrs(poly_source.sourceCrs())
+        distArea.setSourceCrs(poly_source.sourceCrs(), context.transformContext())
         distArea.setEllipsoid(context.project().ellipsoid())
 
         features = poly_source.getFeatures()

diff --git a/src/analysis/network/qgsgraphbuilderinterface.h b/src/analysis/network/qgsgraphbuilderinterface.h
@@ -20,6 +20,7 @@
 #include <QVariant>
 
 #include "qgspoint.h"
+#include "qgsproject.h"
 #include "qgscoordinatereferencesystem.h"
 #include "qgsdistancearea.h"
 #include "qgis_analysis.h"
@@ -62,7 +63,7 @@ class ANALYSIS_EXPORT QgsGraphBuilderInterface
       , mCtfEnabled( ctfEnabled )
       , mTopologyTolerance( topologyTolerance )
     {
-      mDa.setSourceCrs( mCrs );
+      mDa.setSourceCrs( mCrs, QgsProject::instance()->transformContext() );
       mDa.setEllipsoid( ellipsoidID );
     }
 

diff --git a/src/app/qgisapp.cpp b/src/app/qgisapp.cpp
@@ -8196,7 +8196,7 @@ void QgisApp::selectByForm()
   }
   QgsDistanceArea myDa;
 
-  myDa.setSourceCrs( vlayer->crs() );
+  myDa.setSourceCrs( vlayer->crs(), QgsProject::instance()->transformContext() );
   myDa.setEllipsoid( QgsProject::instance()->ellipsoid() );
 
   QgsAttributeEditorContext context;

diff --git a/src/app/qgisappinterface.cpp b/src/app/qgisappinterface.cpp
@@ -781,7 +781,7 @@ QgsAttributeDialog *QgisAppInterface::getFeatureForm( QgsVectorLayer *l, QgsFeat
 {
   QgsDistanceArea myDa;
 
-  myDa.setSourceCrs( l->crs() );
+  myDa.setSourceCrs( l->crs(), QgsProject::instance()->transformContext() );
   myDa.setEllipsoid( QgsProject::instance()->ellipsoid() );
 
   QgsAttributeEditorContext context;

diff --git a/src/app/qgsattributeactionpropertiesdialog.cpp b/src/app/qgsattributeactionpropertiesdialog.cpp
@@ -208,7 +208,7 @@ void QgsAttributeActionPropertiesDialog::init( const QSet<QString> &actionScopes
   }
 
   QgsDistanceArea myDa;
-  myDa.setSourceCrs( mLayer->crs() );
+  myDa.setSourceCrs( mLayer->crs(), QgsProject::instance()->transformContext() );
   myDa.setEllipsoid( QgsProject::instance()->ellipsoid() );
 
   mFieldExpression->setLayer( mLayer );

diff --git a/src/app/qgsattributetabledialog.cpp b/src/app/qgsattributetabledialog.cpp
@@ -142,7 +142,7 @@ QgsAttributeTableDialog::QgsAttributeTableDialog( QgsVectorLayer *layer, QgsAttr
 
   myDa = new QgsDistanceArea();
 
-  myDa->setSourceCrs( mLayer->crs() );
+  myDa->setSourceCrs( mLayer->crs(), QgsProject::instance()->transformContext() );
   myDa->setEllipsoid( QgsProject::instance()->ellipsoid() );
 
   mEditorContext.setDistanceArea( *myDa );
@@ -621,7 +621,7 @@ void QgsAttributeTableDialog::filterExpressionBuilder()
   dlg.setWindowTitle( tr( "Expression Based Filter" ) );
 
   QgsDistanceArea myDa;
-  myDa.setSourceCrs( mLayer->crs() );
+  myDa.setSourceCrs( mLayer->crs(), QgsProject::instance()->transformContext() );
   myDa.setEllipsoid( QgsProject::instance()->ellipsoid() );
   dlg.setGeomCalculator( myDa );
 
@@ -981,7 +981,7 @@ void QgsAttributeTableDialog::setFilterExpression( const QString &filterString,
   QgsFeatureIds filteredFeatures;
   QgsDistanceArea myDa;
 
-  myDa.setSourceCrs( mLayer->crs() );
+  myDa.setSourceCrs( mLayer->crs(), QgsProject::instance()->transformContext() );
   myDa.setEllipsoid( QgsProject::instance()->ellipsoid() );
 
   // parse search string and build parsed tree

diff --git a/src/app/qgsdiagramproperties.cpp b/src/app/qgsdiagramproperties.cpp
@@ -207,7 +207,7 @@ QgsDiagramProperties::QgsDiagramProperties( QgsVectorLayer *layer, QWidget *pare
   // field combo and expression button
   mSizeFieldExpressionWidget->setLayer( mLayer );
   QgsDistanceArea myDa;
-  myDa.setSourceCrs( mLayer->crs() );
+  myDa.setSourceCrs( mLayer->crs(), QgsProject::instance()->transformContext() );
   myDa.setEllipsoid( QgsProject::instance()->ellipsoid() );
   mSizeFieldExpressionWidget->setGeomCalculator( myDa );
 
@@ -939,7 +939,7 @@ QString QgsDiagramProperties::showExpressionBuilder( const QString &initialExpre
   dlg.setWindowTitle( tr( "Expression Based Attribute" ) );
 
   QgsDistanceArea myDa;
-  myDa.setSourceCrs( mLayer->crs() );
+  myDa.setSourceCrs( mLayer->crs(), QgsProject::instance()->transformContext() );
   myDa.setEllipsoid( QgsProject::instance()->ellipsoid() );
   dlg.setGeomCalculator( myDa );
 

diff --git a/src/app/qgsfeatureaction.cpp b/src/app/qgsfeatureaction.cpp
@@ -57,7 +57,7 @@ QgsAttributeDialog *QgsFeatureAction::newDialog( bool cloneFeature )
 
   QgsDistanceArea myDa;
 
-  myDa.setSourceCrs( mLayer->crs() );
+  myDa.setSourceCrs( mLayer->crs(), QgsProject::instance()->transformContext() );
   myDa.setEllipsoid( QgsProject::instance()->ellipsoid() );
 
   context.setDistanceArea( myDa );

diff --git a/src/app/qgsfieldcalculator.cpp b/src/app/qgsfieldcalculator.cpp
@@ -61,7 +61,7 @@ QgsFieldCalculator::QgsFieldCalculator( QgsVectorLayer *vl, QWidget *parent )
   connect( mButtonBox, &QDialogButtonBox::helpRequested, this, &QgsFieldCalculator::showHelp );
 
   QgsDistanceArea myDa;
-  myDa.setSourceCrs( vl->crs() );
+  myDa.setSourceCrs( vl->crs(), QgsProject::instance()->transformContext() );
   myDa.setEllipsoid( QgsProject::instance()->ellipsoid() );
   builder->setGeomCalculator( myDa );
 
@@ -160,7 +160,7 @@ void QgsFieldCalculator::accept()
   // Set up QgsDistanceArea each time we (re-)calculate
   QgsDistanceArea myDa;
 
-  myDa.setSourceCrs( mVectorLayer->crs() );
+  myDa.setSourceCrs( mVectorLayer->crs(), QgsProject::instance()->transformContext() );
   myDa.setEllipsoid( QgsProject::instance()->ellipsoid() );
 
   QString calcString = builder->expressionText();

diff --git a/src/app/qgslabelinggui.cpp b/src/app/qgslabelinggui.cpp
@@ -113,7 +113,7 @@ void QgsLabelingGui::setLayer( QgsMapLayer *mapLayer )
 
   mFieldExpressionWidget->setLayer( mLayer );
   QgsDistanceArea da;
-  da.setSourceCrs( mLayer->crs() );
+  da.setSourceCrs( mLayer->crs(), QgsProject::instance()->transformContext() );
   da.setEllipsoid( QgsProject::instance()->ellipsoid() );
   mFieldExpressionWidget->setGeomCalculator( da );
 

diff --git a/src/app/qgsmaptoolmeasureangle.cpp b/src/app/qgsmaptoolmeasureangle.cpp
@@ -182,6 +182,6 @@ void QgsMapToolMeasureAngle::updateSettings()
 void QgsMapToolMeasureAngle::configureDistanceArea()
 {
   QString ellipsoidId = QgsProject::instance()->ellipsoid();
-  mDa.setSourceCrs( mCanvas->mapSettings().destinationCrs() );
+  mDa.setSourceCrs( mCanvas->mapSettings().destinationCrs(), QgsProject::instance()->transformContext() );
   mDa.setEllipsoid( ellipsoidId );
 }
diff --git a/src/app/qgsmaptooloffsetpointsymbol.cpp b/src/app/qgsmaptooloffsetpointsymbol.cpp
@@ -250,7 +250,7 @@ QPointF QgsMapToolOffsetPointSymbol::calculateOffset( const QgsPointXY &startPoi
     case QgsUnitTypes::RenderMetersInMapUnits:
     {
       QgsDistanceArea distanceArea;
-      distanceArea.setSourceCrs( mCanvas->mapSettings().destinationCrs() );
+      distanceArea.setSourceCrs( mCanvas->mapSettings().destinationCrs(), QgsProject::instance()->transformContext() );
       distanceArea.setEllipsoid( mCanvas->mapSettings().ellipsoid() );
       // factor=1.0 / 1 meter in MapUnits
       factor = 1.0 / distanceArea.measureLineProjected( startPoint );

diff --git a/src/app/qgsmeasuredialog.cpp b/src/app/qgsmeasuredialog.cpp
@@ -105,7 +105,7 @@ void QgsMeasureDialog::updateSettings()
   // Configure QgsDistanceArea
   mDistanceUnits = QgsProject::instance()->distanceUnits();
   mAreaUnits = QgsProject::instance()->areaUnits();
-  mDa.setSourceCrs( mTool->canvas()->mapSettings().destinationCrs() );
+  mDa.setSourceCrs( mTool->canvas()->mapSettings().destinationCrs(), QgsProject::instance()->transformContext() );
   mDa.setEllipsoid( QgsProject::instance()->ellipsoid() );
 
   mTable->clear();

diff --git a/src/core/composer/qgscomposerhtml.cpp b/src/core/composer/qgscomposerhtml.cpp
@@ -530,14 +530,14 @@ void QgsComposerHtml::setExpressionContext( const QgsFeature &feature, QgsVector
   //setup distance area conversion
   if ( layer )
   {
-    mDistanceArea->setSourceCrs( layer->crs() );
+    mDistanceArea->setSourceCrs( layer->crs(), mComposition->project()->transformContext() );
   }
   else if ( mComposition )
   {
     //set to composition's mapsettings' crs
     QgsComposerMap *referenceMap = mComposition->referenceMap();
     if ( referenceMap )
-      mDistanceArea->setSourceCrs( referenceMap->crs() );
+      mDistanceArea->setSourceCrs( referenceMap->crs(), mComposition->project()->transformContext() );
   }
   if ( mComposition )
   {

diff --git a/src/core/composer/qgscomposerlabel.cpp b/src/core/composer/qgscomposerlabel.cpp
@@ -260,14 +260,14 @@ void QgsComposerLabel::refreshExpressionContext()
   //setup distance area conversion
   if ( layer )
   {
-    mDistanceArea->setSourceCrs( layer->crs() );
+    mDistanceArea->setSourceCrs( layer->crs(), mComposition->project()->transformContext() );
   }
   else
   {
     //set to composition's reference map's crs
     QgsComposerMap *referenceMap = mComposition->referenceMap();
     if ( referenceMap )
-      mDistanceArea->setSourceCrs( referenceMap->crs() );
+      mDistanceArea->setSourceCrs( referenceMap->crs(), mComposition->project()->transformContext() );
   }
   mDistanceArea->setEllipsoid( mComposition->project()->ellipsoid() );
   contentChanged();

diff --git a/src/core/composer/qgscomposerscalebar.cpp b/src/core/composer/qgscomposerscalebar.cpp
@@ -337,7 +337,7 @@ double QgsComposerScaleBar::mapWidth() const
   else
   {
     QgsDistanceArea da;
-    da.setSourceCrs( mComposerMap->crs() );
+    da.setSourceCrs( mComposerMap->crs(), mComposition->project()->transformContext() );
     da.setEllipsoid( mComposition->project()->ellipsoid() );
 
     QgsUnitTypes::DistanceUnit units = da.lengthUnits();

diff --git a/src/core/layout/qgslayoutitemhtml.cpp b/src/core/layout/qgslayoutitemhtml.cpp
@@ -487,7 +487,7 @@ void QgsLayoutItemHtml::setExpressionContext( const QgsFeature &feature, QgsVect
   //setup distance area conversion
   if ( layer )
   {
-    mDistanceArea.setSourceCrs( layer->crs() );
+    mDistanceArea.setSourceCrs( layer->crs(), mLayout->project()->transformContext() );
   }
   else if ( mLayout )
   {

diff --git a/src/core/layout/qgslayoutitemlabel.cpp b/src/core/layout/qgslayoutitemlabel.cpp
@@ -250,7 +250,7 @@ void QgsLayoutItemLabel::refreshExpressionContext()
   //setup distance area conversion
   if ( layer )
   {
-    mDistanceArea->setSourceCrs( layer->crs() );
+    mDistanceArea->setSourceCrs( layer->crs(), mLayout->project()->transformContext() );
   }
   else
   {

diff --git a/src/core/layout/qgslayoutitemscalebar.cpp b/src/core/layout/qgslayoutitemscalebar.cpp
@@ -301,7 +301,7 @@ double QgsLayoutItemScaleBar::mapWidth() const
   else
   {
     QgsDistanceArea da;
-    da.setSourceCrs( mMap->crs() );
+    da.setSourceCrs( mMap->crs(), mLayout->project()->transformContext() );
     da.setEllipsoid( mLayout->project()->ellipsoid() );
 
     QgsUnitTypes::DistanceUnit units = da.lengthUnits();

diff --git a/src/core/processing/qgsprocessingcontext.h b/src/core/processing/qgsprocessingcontext.h
@@ -74,6 +74,7 @@ class CORE_EXPORT QgsProcessingContext
     {
       mFlags = other.mFlags;
       mProject = other.mProject;
+      mTransformContext = other.mTransformContext;
       mExpressionContext = other.mExpressionContext;
       mInvalidGeometryCallback = other.mInvalidGeometryCallback;
       mInvalidGeometryCheck = other.mInvalidGeometryCheck;

diff --git a/src/core/qgsdistancearea.cpp b/src/core/qgsdistancearea.cpp
@@ -44,7 +44,8 @@ QgsDistanceArea::QgsDistanceArea()
   mSemiMajor = -1.0;
   mSemiMinor = -1.0;
   mInvFlattening = -1.0;
-  setSourceCrs( QgsCoordinateReferenceSystem::fromSrsId( GEOCRS_ID ) ); // WGS 84
+  QgsCoordinateTransformContext context; // this is ok - by default we have a source/dest of WGS84, so no reprojection takes place
+  setSourceCrs( QgsCoordinateReferenceSystem::fromSrsId( GEOCRS_ID ), context ); // WGS 84
   setEllipsoid( GEO_NONE );
 }
 
@@ -53,8 +54,9 @@ bool QgsDistanceArea::willUseEllipsoid() const
   return mEllipsoid != GEO_NONE;
 }
 
-void QgsDistanceArea::setSourceCrs( const QgsCoordinateReferenceSystem &srcCRS )
+void QgsDistanceArea::setSourceCrs( const QgsCoordinateReferenceSystem &srcCRS, const QgsCoordinateTransformContext &context )
 {
+  mCoordTransform.setContext( context );
   mCoordTransform.setSourceCrs( srcCRS );
 }