Add number of vertices to derived fields in identify tool

Author: Sandro Santilli

src/gui/qgsmaptoolidentify.cpp

@@ -307,20 +307,23 @@ QMap< QString, QString > QgsMapToolIdentify::featureDerivedAttributes( QgsFeatur
 
   if ( geometryType == QGis::Line )
   {
+    const QgsPolyline &pline = feature->constGeometry()->asPolyline();
     double dist = calc.measure( feature->constGeometry() );
     QGis::UnitType myDisplayUnits;
     convertMeasurement( calc, dist, myDisplayUnits, false );
     QString str = calc.textUnit( dist, 3, myDisplayUnits, false );  // dist and myDisplayUnits are out params
     derivedAttributes.insert( tr( "Length" ), str );
+    str = QLocale::system().toString( pline.size() );
+    derivedAttributes.insert( tr( "Vertices" ), str );
     if ( wkbType == QGis::WKBLineString || wkbType == QGis::WKBLineString25D )
     {
       // Add the start and end points in as derived attributes
-      QgsPoint pnt = mCanvas->mapSettings().layerToMapCoordinates( layer, feature->constGeometry()->asPolyline().first() );
+      QgsPoint pnt = mCanvas->mapSettings().layerToMapCoordinates( layer, pline.first() );
       str = QLocale::system().toString( pnt.x(), 'g', 10 );
       derivedAttributes.insert( tr( "firstX", "attributes get sorted; translation for lastX should be lexically larger than this one" ), str );
       str = QLocale::system().toString( pnt.y(), 'g', 10 );
       derivedAttributes.insert( tr( "firstY" ), str );
-      pnt = mCanvas->mapSettings().layerToMapCoordinates( layer, feature->constGeometry()->asPolyline().last() );
+      pnt = mCanvas->mapSettings().layerToMapCoordinates( layer, pline.last() );
       str = QLocale::system().toString( pnt.x(), 'g', 10 );
       derivedAttributes.insert( tr( "lastX", "attributes get sorted; translation for firstX should be lexically smaller than this one" ), str );
       str = QLocale::system().toString( pnt.y(), 'g', 10 );