Store relation between layer and coordinate transform in maprenderer …

…class
qgis · Oct 17, 2013 · ba524fc · ba524fc
1 parent 39fd5b8
commit ba524fc
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Showing 2 changed files with 62 additions and 1 deletion.
diff --git a/src/core/qgsmaprenderer.cpp b/src/core/qgsmaprenderer.cpp
@@ -1101,6 +1101,31 @@ bool QgsMapRenderer::readXML( QDomNode & theNode )
   aoi.setYMaximum( ymax );
 
   setExtent( aoi );
+
+  mLayerCoordinateTransformInfo.clear();
+  QDomElement layerCoordTransformInfoElem = theNode.firstChildElement( "layer_coordinate_transform_info" );
+  if ( !layerCoordTransformInfoElem.isNull() )
+  {
+    QDomNodeList layerCoordinateTransformList = layerCoordTransformInfoElem.elementsByTagName( "layer_coordinate_transform" );
+    QDomElement layerCoordTransformElem;
+    for ( int i = 0; i < layerCoordinateTransformList.size(); ++i )
+    {
+      layerCoordTransformElem = layerCoordinateTransformList.at( i ).toElement();
+      QString layerId = layerCoordTransformElem.attribute( "layerid" );
+      if ( layerId.isEmpty() )
+      {
+        continue;
+      }
+
+      QgsLayerCoordinateTransform lct;
+      lct.srcAuthId = layerCoordTransformElem.attribute( "srcAuthId" );
+      lct.destAuthId = layerCoordTransformElem.attribute( "destAuthId" );
+      lct.srcDatumTransform = layerCoordTransformElem.attribute( "srcDatumTransform", "-1" ).toInt();
+      lct.destDatumTransform = layerCoordTransformElem.attribute( "destDatumTransform", "-1" ).toInt();
+      mLayerCoordinateTransformInfo.insert( layerId, lct );
+    }
+  }
+
   return true;
 }
 
@@ -1170,6 +1195,20 @@ bool QgsMapRenderer::writeXML( QDomNode & theNode, QDomDocument & theDoc )
   theNode.appendChild( srsNode );
   destinationCrs().writeXML( srsNode, theDoc );
 
+  // layer coordinate transform infos
+  QDomElement layerCoordTransformInfo = theDoc.createElement( "layer_coordinate_transform_info" );
+  QHash< QString, QgsLayerCoordinateTransform >::const_iterator coordIt = mLayerCoordinateTransformInfo.constBegin();
+  for ( ; coordIt != mLayerCoordinateTransformInfo.constEnd(); ++coordIt )
+  {
+    QDomElement layerCoordTransformElem = theDoc.createElement( "layer_coordinate_transform" );
+    layerCoordTransformElem.setAttribute( "layerid", coordIt.key() );
+    layerCoordTransformElem.setAttribute( "srcAuthId", coordIt->srcAuthId );
+    layerCoordTransformElem.setAttribute( "destAuthId", coordIt->destAuthId );
+    layerCoordTransformElem.setAttribute( "srcDatumTransform", QString::number( coordIt->srcDatumTransform ) );
+    layerCoordTransformElem.setAttribute( "destDatumTransform", QString::number( coordIt->destDatumTransform ) );
+    layerCoordTransformInfo.appendChild( layerCoordTransformElem );
+  }
+  theNode.appendChild( layerCoordTransformInfo );
   return true;
 }
 
@@ -1264,4 +1303,13 @@ QgsMapRenderer::BlendMode QgsMapRenderer::getBlendModeEnum( const QPainter::Comp
   }
 }
 
+const QgsCoordinateTransform* QgsMapRenderer::coordinateTransformFromCache( const QString& layerId )
+{
+  //todo: lookup in mLayerCoordinateTransformInfo
+  //not present? Emit signal
+  //still not present? get coordinate transformation with -1/-1 datum transform
+
+  return 0;
+}
+
 bool QgsMapRenderer::mDrawing = false;
diff --git a/src/core/qgsmaprenderer.h b/src/core/qgsmaprenderer.h
@@ -110,7 +110,13 @@ class CORE_EXPORT QgsLabelingEngineInterface
     virtual QgsLabelingEngineInterface* clone() = 0;
 };
 
-
+struct CORE_EXPORT QgsLayerCoordinateTransform
+{
+  QString srcAuthId;
+  QString destAuthId;
+  int srcDatumTransform; //-1 if unknown or not specified
+  int destDatumTransform;
+};
 
 /** \ingroup core
  * A non GUI class for rendering a map layer set onto a QPainter.
@@ -289,6 +295,8 @@ class CORE_EXPORT QgsMapRenderer : public QObject
     //! Added in 1.9
     static QgsMapRenderer::BlendMode getBlendModeEnum( const QPainter::CompositionMode blendMode );
 
+    const QgsCoordinateTransform* coordinateTransformFromCache( const QString& layerId );
+
   signals:
 
     void drawingProgress( int current, int total );
@@ -304,6 +312,9 @@ class CORE_EXPORT QgsMapRenderer : public QObject
     //! emitted when layer's draw() returned false
     void drawError( QgsMapLayer* );
 
+    //! Notifies higher level components to show the datum transform dialog and add a QgsLayerCoordinateTransformInfo for that layer
+    void datumTransformInfoRequested( QgsMapLayer* ml, const QString& srcAuthId, const QString& destAuthId );
+
   public slots:
 
     //! called by signal from layer current being drawn
@@ -376,6 +387,8 @@ class CORE_EXPORT QgsMapRenderer : public QObject
     //! Locks rendering loop for concurrent draws
     QMutex mRenderMutex;
 
+    QHash< QString, QgsLayerCoordinateTransform > mLayerCoordinateTransformInfo;
+
   private:
     const QgsCoordinateTransform* tr( QgsMapLayer *layer );
 };