identify context only if not projected

Author: blazek

src/app/qgsmaptoolidentify.cpp

@@ -335,74 +335,45 @@ bool QgsMapToolIdentify::identifyRasterLayer( QgsRasterLayer *layer, int x, int
     QgsDebugMsg( QString( "coordinate not reprojectable: %1" ).arg( cse.what() ) );
     return false;
   }
+  QgsDebugMsg( QString( "idPoint = %1 %2" ).arg( idPoint.x() ).arg( idPoint.y() ) );
 
   if ( !layer->extent().contains( idPoint ) ) return false;
 
-#if 0
-  if ( layer->providerType() == "wms" )
-  {
-    type = tr( "WMS layer" );
-
-    //if WMS layer does not cover the view origin,
-    //we need to map the view pixel coordinates
-    //to WMS layer pixel coordinates
-    QgsRectangle viewExtent = toLayerCoordinates( layer, mCanvas->extent() );
-    QgsRectangle layerExtent = layer->extent();
-    double mapUnitsPerPixel = mCanvas->mapUnitsPerPixel();
-    if ( mapUnitsPerPixel > 0 && viewExtent.intersects( layerExtent ) )
-    {
-      double xMinView = viewExtent.xMinimum();
-      double yMaxView = viewExtent.yMaximum();
-      double xMinLayer = layerExtent.xMinimum();
-      double yMaxLayer = layerExtent.yMaximum();
-
-      idPoint.set(
-        xMinView < xMinLayer ? floor( x - ( xMinLayer - xMinView ) / mapUnitsPerPixel ) : x,
-        yMaxView > yMaxLayer ? floor( y - ( yMaxView - yMaxLayer ) / mapUnitsPerPixel ) : y
-      );
-
-      attributes.insert( tr( "Feature info" ), layer->identifyAsHtml( idPoint ) );
-    }
-    else
-    {
-      res = false;
-    }
-  }
-#endif
+  QgsRectangle viewExtent = mCanvas->extent();
 
-  // TODO: extent, width, heigh are approximated only if layer is reprojected!!!!
-  // How to do it better? We dont know source resolution used to reproject the layer.
+  QMap< QString, QString > attributes, derivedAttributes;
 
-  QgsRectangle viewExtent = mCanvas->extent();
+  // We can only use context (extent, width, heigh) if layer is not reprojected,
+  // otherwise we don't know source resolution (size).
   if ( mCanvas->hasCrsTransformEnabled() && dprovider->crs() != mCanvas->mapRenderer()->destinationCrs() )
   {
     viewExtent = toLayerCoordinates( layer, viewExtent );
+    attributes = dprovider->identify( idPoint );
   }
+  else
+  {
+    // It would be nice to use the same extent and size which was used for drawing,
+    // so that WCS can use cache from last draw, unfortunately QgsRasterLayer::draw()
+    // is doing some tricks with extent and size to allign raster to output which
+    // would be difficult to replicate here.
+    // Note: cutting the extent may result in slightly different x and y resolutions
+    // and thus shifted point calculated back in QGIS WMS (using average resolution)
+    //viewExtent = dprovider->extent().intersect( &viewExtent );
 
-  // It would be nice to use the same extent and size which was used for drawing,
-  // so that WCS can use cache from last draw, unfortunately QgsRasterLayer::draw()
-  // is doing some tricks with extent and size to allign raster to output which
-  // would be difficult to replicate here.
-  // Note: cutting the extent may result in slightly different x and y resolutions
-  // and thus shifted point calculated back in QGIS WMS (using average resolution)
-  //viewExtent = dprovider->extent().intersect( &viewExtent );
-
-  double mapUnitsPerPixel = mCanvas->mapUnitsPerPixel();
-  // Width and height are calculated from not projected extent and we hope that
-  // are similar to source width and height used to reproject layer for drawing.
-  // TODO: may be very dangerous, because it may result in different resolutions
-  // in source CRS, and WMS server (QGIS server) calcs wrong coor using average resolution.
-  int width = qRound( viewExtent.width() / mapUnitsPerPixel );
-  int height = qRound( viewExtent.height() / mapUnitsPerPixel );
-
-  QgsDebugMsg( QString( "viewExtent.width = %1 viewExtent.height = %2" ).arg( viewExtent.width() ).arg( viewExtent.height() ) );
-  QgsDebugMsg( QString( "width = %1 height = %2" ).arg( width ).arg( height ) );
-  QgsDebugMsg( QString( "xRes = %1 yRes = %2 mapUnitsPerPixel = %3" ).arg( viewExtent.width() / width ).arg( viewExtent.height() / height ).arg( mapUnitsPerPixel ) );
-
-  QMap< QString, QString > attributes, derivedAttributes;
-
-  QgsDebugMsg( QString( "idPoint: %1 %2" ).arg( idPoint.x() ).arg( idPoint.y() ) );
-  attributes = dprovider->identify( idPoint, viewExtent, width, height );
+    double mapUnitsPerPixel = mCanvas->mapUnitsPerPixel();
+    // Width and height are calculated from not projected extent and we hope that
+    // are similar to source width and height used to reproject layer for drawing.
+    // TODO: may be very dangerous, because it may result in different resolutions
+    // in source CRS, and WMS server (QGIS server) calcs wrong coor using average resolution.
+    int width = qRound( viewExtent.width() / mapUnitsPerPixel );
+    int height = qRound( viewExtent.height() / mapUnitsPerPixel );
+
+    QgsDebugMsg( QString( "viewExtent.width = %1 viewExtent.height = %2" ).arg( viewExtent.width() ).arg( viewExtent.height() ) );
+    QgsDebugMsg( QString( "width = %1 height = %2" ).arg( width ).arg( height ) );
+    QgsDebugMsg( QString( "xRes = %1 yRes = %2 mapUnitsPerPixel = %3" ).arg( viewExtent.width() / width ).arg( viewExtent.height() / height ).arg( mapUnitsPerPixel ) );
+
+    attributes = dprovider->identify( idPoint, viewExtent, width, height );
+  }
 
   QString type;
   type = tr( "Raster" );