Fix for ticket #562 small bug in WMS getFeatureInfo handling

mhugent · mhugent · commit 3cfc885fc208 · 2007-06-08T07:16:16.000Z
git-svn-id: http://svn.osgeo.org/qgis/trunk@6986 c8812cc2-4d05-0410-92ff-de0c093fc19c
diff --git a/src/app/qgsmaptoolidentify.cpp b/src/app/qgsmaptoolidentify.cpp
@@ -165,8 +165,45 @@ void QgsMapToolIdentify::identifyRasterWmsLayer(QgsRasterLayer* layer, const Qgs
     return;
   }
 
-  QString text = layer->identifyAsText(point);
+  //if WMS layer does not cover the view origin,
+  //we need to map the view pixel coordinates
+  //to WMS layer pixel coordinates
+  QgsRect viewExtent = mCanvas->extent();
+  double mupp = mCanvas->mupp();
+  if(mupp == 0)
+    {
+      return;
+    }
+  double xMinView = viewExtent.xMin();
+  double yMaxView = viewExtent.yMax();
+
+  QgsRect layerExtent = layer->extent();
+  double xMinLayer = layerExtent.xMin();
+  double yMaxLayer = layerExtent.yMax();
+
+  double i, j;
+
+  if(xMinView < xMinLayer)
+    {
+      i = (int)(point.x() - (xMinLayer - xMinView) / mupp); 
+    }
+  else
+    {
+      i = point.x();
+    }
 
+  if(yMaxView > yMaxLayer)
+    {
+      j = (int)(point.y() - (yMaxView - yMaxLayer) / mupp);
+    }
+  else
+    {
+      j = point.y();
+    }
+  
+
+  QString text = layer->identifyAsText(QgsPoint(i, j));
+  
   if (text.isEmpty())
   {
     showError(layer);
