Index: applications/editors/josm/plugins/utilsplugin2/src/utilsplugin2/SymmetryAction.java
===================================================================
--- applications/editors/josm/plugins/utilsplugin2/src/utilsplugin2/SymmetryAction.java	(revision 26393)
+++ applications/editors/josm/plugins/utilsplugin2/src/utilsplugin2/SymmetryAction.java	(revision 26393)
@@ -0,0 +1,102 @@
+// License: GPL. Copyright 2007 by Immanuel Scholz and others
+package utilsplugin2;
+
+import static org.openstreetmap.josm.tools.I18n.tr;
+import static org.openstreetmap.josm.gui.help.HelpUtil.ht;
+
+import java.awt.event.ActionEvent;
+import java.awt.event.KeyEvent;
+import java.util.Collection;
+import java.util.HashSet;
+import java.util.LinkedList;
+
+import javax.swing.JOptionPane;
+
+import org.openstreetmap.josm.Main;
+import org.openstreetmap.josm.actions.JosmAction;
+import org.openstreetmap.josm.command.Command;
+import org.openstreetmap.josm.command.MoveCommand;
+import org.openstreetmap.josm.command.SequenceCommand;
+import org.openstreetmap.josm.data.coor.EastNorth;
+import org.openstreetmap.josm.data.osm.Node;
+import org.openstreetmap.josm.data.osm.OsmPrimitive;
+import org.openstreetmap.josm.data.osm.Way;
+import org.openstreetmap.josm.tools.Shortcut;
+
+/**
+ * Mirror the selected ways nodes or ways along line given by two first selected points
+ *
+ * Note: If a ways are selected, their nodes are mirrored
+ *
+ * @author Alexei Kasatkin, based on much copy&Paste from other MirrorAction :)
+ */ 
+public final class SymmetryAction extends JosmAction {
+
+    public SymmetryAction() {
+        super(tr("Symmetry"), "symmetry", tr("Mirror selected nodes and ways."),
+                Shortcut.registerShortcut("tools:symmetry", tr("Tool: {0}", tr("Symmetry")),
+                        KeyEvent.VK_S, Shortcut.GROUP_EDIT, KeyEvent.ALT_DOWN_MASK), true);
+        putValue("help", ht("/Action/Symmtry"));
+    }
+
+    public void actionPerformed(ActionEvent e) {
+        Collection<OsmPrimitive> sel = getCurrentDataSet().getSelected();
+        HashSet<Node> nodes = new HashSet<Node>();
+        EastNorth p1=null,p2=null;
+        
+        for (OsmPrimitive osm : sel) {
+            if (osm instanceof Node) {
+                if (p1==null) p1=((Node)osm).getEastNorth(); else
+                if (p2==null) p2=((Node)osm).getEastNorth(); else
+                nodes.add((Node)osm);
+            }
+        }
+        for (OsmPrimitive osm : sel) {
+            if (osm instanceof Way) {
+                nodes.addAll(((Way)osm).getNodes());
+            }
+        }
+        
+        if (p1==null || p2==null || nodes.size() < 1) {
+            JOptionPane.showMessageDialog(
+                    Main.parent,
+                    tr("Please select at least two nodes for symmetry axis and something else to mirror."),
+                    tr("Information"),
+                    JOptionPane.INFORMATION_MESSAGE
+            );
+            return;
+        }
+
+        double ne,nn,l,e0,n0;
+        e0=p1.east();        n0=p1.north();
+        ne =  -(p2.north()-p1.north());      nn =  (p2.east()-p1.east());
+        l = Math.hypot(ne,nn);
+        ne /= l; nn /= l; // normal unit vector
+        
+        Collection<Command> cmds = new LinkedList<Command>();
+
+        for (Node n : nodes) {
+            EastNorth c = n.getEastNorth();
+            double pr = (c.east()-e0)*ne + (c.north()-n0)*nn;
+            //pr=10;
+            cmds.add(new MoveCommand(n, -2*ne*pr, -2*nn*pr ));
+        }
+
+        Main.main.undoRedo.add(new SequenceCommand(tr("Symmetry"), cmds));
+        Main.map.repaint();
+    }
+
+    @Override
+    protected void updateEnabledState() {
+        if (getCurrentDataSet() == null) {
+            setEnabled(false);
+        } else {
+            updateEnabledState(getCurrentDataSet().getSelected());
+        }
+    }
+
+    @Override
+    protected void updateEnabledState(Collection<? extends OsmPrimitive> selection) {
+        setEnabled(selection != null && !selection.isEmpty());
+    }
+}
Index: applications/editors/josm/plugins/utilsplugin2/src/utilsplugin2/UtilsPlugin2.java
===================================================================
--- applications/editors/josm/plugins/utilsplugin2/src/utilsplugin2/UtilsPlugin2.java	(revision 26320)
+++ applications/editors/josm/plugins/utilsplugin2/src/utilsplugin2/UtilsPlugin2.java	(revision 26393)
@@ -17,4 +17,5 @@
 public class UtilsPlugin2 extends Plugin {
     JMenuItem unglueRelation;
+    JMenuItem symmetry;
     JMenuItem addIntersections;
     JMenuItem splitObject;
@@ -46,5 +47,5 @@
         addIntersections = MainMenu.add(toolsMenu, new AddIntersectionsAction());
         splitObject = MainMenu.add(toolsMenu, new SplitObjectAction());
-
+        
         toolsMenu.addSeparator();
         replaceGeometry = MainMenu.add(toolsMenu, new ReplaceGeometryAction());
@@ -55,4 +56,5 @@
         splitOnIntersections = MainMenu.add(toolsMenu, new SplitOnIntersectionsAction());
         extractPoint = MainMenu.add(toolsMenu, new ExtractPointAction());
+        symmetry = MainMenu.add(toolsMenu, new SymmetryAction());
 
         JMenu selectionMenu = Main.main.menu.addMenu(marktr("Selection"), KeyEvent.VK_N, Main.main.menu.defaultMenuPos, "help");