More topological editing fixes from Marco

timlinux · timlinux · commit 2fdfed358437 · 2008-10-10T21:36:34.000Z
git-svn-id: http://svn.osgeo.org/qgis/trunk/qgis@9473 c8812cc2-4d05-0410-92ff-de0c093fc19c
diff --git a/src/app/qgsmaptooladdvertex.cpp b/src/app/qgsmaptooladdvertex.cpp
@@ -91,6 +91,14 @@ void QgsMapToolAddVertex::canvasReleaseEvent( QMouseEvent * e )
 
     if ( mSnapper.snapToBackgroundLayers( e->pos(), snapResults ) == 0 )
     {
+
+      //add segment points in case of topological editing
+      int topologicalEditing = QgsProject::instance()->readNumEntry( "Digitizing", "/TopologicalEditing", 0 );
+      if ( topologicalEditing )
+	{
+	  insertSegmentVerticesForSnap( snapResults, vlayer );
+	}
+
       snappedPointMapCoord = snapPointFromResults( snapResults, e->pos() );
       snappedPointLayerCoord = toLayerCoordinates( vlayer, snappedPointMapCoord );
 
diff --git a/src/core/qgsvectorlayer.cpp b/src/core/qgsvectorlayer.cpp
@@ -1906,7 +1906,17 @@ int QgsVectorLayer::addTopologicalPoints( const QgsPoint& p )
 
   QList<QgsSnappingResult> filteredSnapResults; //we filter out the results that are on existing vertices
 
-  const double threshold = 0.00000001;
+  //work with a tolerance because coordinate projection may introduce some rounding
+  double threshold =  0.0000001;
+  if(mCRS && mCRS->mapUnits() == QGis::Meters)
+    {
+      threshold = 0.001; 
+    }
+  else if(mCRS && mCRS->mapUnits() == QGis::Feet)
+    {
+      threshold = 0.0001;
+    }
+  
 
   if ( snapWithContext( p, threshold, snapResults, QgsSnapper::SNAP_TO_SEGMENT ) != 0 )
   {
