Fixed for simplify tool, show a message if the feature can't be simpl…

…ified.

By Richard Kostecky.


git-svn-id: http://svn.osgeo.org/qgis/trunk/qgis@11144 c8812cc2-4d05-0410-92ff-de0c093fc19c

src/app/qgsmaptoolsimplify.cpp

@@ -153,7 +153,7 @@ bool QgsMapToolSimplify::calculateSliderBoudaries()
   bool isLine = mSelectedFeature.geometry()->type() == QGis::Line;
   QVector<QgsPoint> pts = getPointList( mSelectedFeature );
   int size = pts.size();
-  if ( size == 0 || ( isLine && size < 2 ) || ( !isLine && size < 4 ) )
+  if ( size == 0 || ( isLine && size <= 2 ) || ( !isLine && size <= 4 ) )
   {
     return false;
   }
@@ -294,6 +294,10 @@ void QgsMapToolSimplify::canvasPressEvent( QMouseEvent * e )
       // show dialog as a non-modal window
       mSimplifyDialog->show();
     }
+    else
+    {
+      QMessageBox::warning( 0, tr( "Unsupported operation" ), tr( "This feature cannot be simplified. Check if feature has enough vertices to be simplified." ) );
+    }
   }
 }