[FEATURE]: Select features in feature info intersecting a geometry

Author: mhugent

src/server/services/wms/qgswmsrenderer.cpp

@@ -715,6 +715,17 @@ namespace QgsWms
       j = -1;
     }
 
+    //read FILTER_GEOM
+    QgsGeometry* filterGeom = 0;
+    if( mParameters.contains( QStringLiteral( "FILTER_GEOM" ) ) )
+    {
+        filterGeom = new QgsGeometry( QgsGeometry::fromWkt( mParameters.value( QStringLiteral( "FILTER_GEOM" ) ) ) );
+        if( filterGeom->isNull() )
+        {
+            delete filterGeom; filterGeom = nullptr;
+        }
+    }
+
     //In case the output image is distorted (WIDTH/HEIGHT ratio not equal to BBOX width/height), I and J need to be adapted as well
     int widthParam = mParameters.value( "WIDTH", "-1" ).toInt();
     int heightParam = mParameters.value( "HEIGHT", "-1" ).toInt();
@@ -736,7 +747,7 @@ namespace QgsWms
       {
         featuresRect.reset( new QgsRectangle() );
       }
-      else
+      else if( !filterGeom )
       {
         throw QgsBadRequestException( QStringLiteral( "ParameterMissing" ),
                                       QStringLiteral( "I/J parameters are required for GetFeatureInfo" ) );
@@ -871,7 +882,7 @@ namespace QgsWms
 
         if ( vectorLayer )
         {
-          if ( !featureInfoFromVectorLayer( vectorLayer, infoPoint.get(), featureCount, result, layerElement, mapSettings, renderContext, version, infoFormat, featuresRect.get() ) )
+          if ( !featureInfoFromVectorLayer( vectorLayer, infoPoint.get(), featureCount, result, layerElement, mapSettings, renderContext, version, infoFormat, featuresRect.get(), filterGeom ) )
           {
             continue;
           }
@@ -1246,7 +1257,8 @@ namespace QgsWms
       QgsRenderContext &renderContext,
       const QString &version,
       const QString &infoFormat,
-      QgsRectangle *featureBBox ) const
+      QgsRectangle *featureBBox,
+      QgsGeometry* filterGeom ) const
   {
     if ( !layer )
     {
@@ -1265,6 +1277,10 @@ namespace QgsWms
     {
       searchRect = featureInfoSearchRect( layer, mapSettings, renderContext, *infoPoint );
     }
+    else if( filterGeom )
+    {
+      searchRect = filterGeom->boundingBox();
+    }
     else if ( mParameters.contains( QStringLiteral( "BBOX" ) ) )
     {
       searchRect = layerRect;
@@ -1282,7 +1298,7 @@ namespace QgsWms
     const QSet<QString> &excludedAttributes = layer->excludeAttributesWms();
 
     QgsFeatureRequest fReq;
-    bool hasGeometry = addWktGeometry || featureBBox;
+    bool hasGeometry = addWktGeometry || featureBBox || filterGeom;
     fReq.setFlags( ( ( hasGeometry ) ? QgsFeatureRequest::NoFlags : QgsFeatureRequest::NoGeometry ) | QgsFeatureRequest::ExactIntersect );
 
     if ( ! searchRect.isEmpty() )
@@ -1294,6 +1310,11 @@ namespace QgsWms
       fReq.setFlags( fReq.flags() & ~ QgsFeatureRequest::ExactIntersect );
     }
 
+    if( filterGeom )
+    {
+        fReq.setFilterExpression( QString("intersects( $geometry, geom_from_wkt('%1') )").arg( filterGeom->exportToWkt() ) );
+    }
+
 #ifdef HAVE_SERVER_PYTHON_PLUGINS
     mAccessControl->filterFeatures( layer, fReq );
 

src/server/services/wms/qgswmsrenderer.h

@@ -223,7 +223,8 @@ namespace QgsWms
                                        QgsRenderContext &renderContext,
                                        const QString &version,
                                        const QString &infoFormat,
-                                       QgsRectangle *featureBBox = nullptr ) const;
+                                       QgsRectangle *featureBBox = nullptr,
+                                       QgsGeometry* filterGeom = nullptr ) const;
       //! Appends feature info xml for the layer to the layer element of the dom document
       bool featureInfoFromRasterLayer( QgsRasterLayer *layer,
                                        const QgsMapSettings &mapSettings,