Index: applications/editors/josm/plugins/piclayer/src/org/openstreetmap/josm/plugins/piclayer/command/TransformCommand.java
===================================================================
--- applications/editors/josm/plugins/piclayer/src/org/openstreetmap/josm/plugins/piclayer/command/TransformCommand.java	(revision 27435)
+++ applications/editors/josm/plugins/piclayer/src/org/openstreetmap/josm/plugins/piclayer/command/TransformCommand.java	(revision 27435)
@@ -0,0 +1,86 @@
+package org.openstreetmap.josm.plugins.piclayer.command;
+
+import static org.openstreetmap.josm.tools.I18n.tr;
+
+import java.util.Collection;
+
+import javax.swing.JLabel;
+
+import org.openstreetmap.josm.Main;
+import org.openstreetmap.josm.command.Command;
+import org.openstreetmap.josm.data.osm.OsmPrimitive;
+import org.openstreetmap.josm.gui.layer.Layer;
+import org.openstreetmap.josm.plugins.piclayer.layer.PicLayerAbstract;
+import org.openstreetmap.josm.plugins.piclayer.transform.PictureTransform;
+import org.openstreetmap.josm.tools.ImageProvider;
+
+public class TransformCommand extends Command {
+
+    private PicLayerAbstract layer;
+    private PictureTransform beforeTransform;
+    private PictureTransform afterTransform;
+    private String actionName;
+
+    public TransformCommand(PicLayerAbstract layer, String actionName) {
+        this.layer = layer;
+        this.actionName = actionName;
+        beforeTransform = extractTransform();
+    }
+
+
+    @Override
+    public void fillModifiedData(Collection<OsmPrimitive> modified,
+            Collection<OsmPrimitive> deleted, Collection<OsmPrimitive> added) {
+    }
+
+    @Override
+    public boolean executeCommand() {
+        placeTransform(afterTransform);
+        Main.map.mapView.repaint();
+        return true;
+    }
+
+    @Override
+    public void undoCommand() {
+        placeTransform(beforeTransform);
+        Main.map.mapView.repaint();
+    }
+
+    private void placeTransform(PictureTransform transform) {
+        layer.getTransformer().setTransform(transform.getTransform());
+        layer.getTransformer().setOriginPoints(transform.getOriginPoints());
+    }
+
+    private PictureTransform extractTransform() {
+        PictureTransform transform = new PictureTransform();
+        transform.setOriginPoints(layer.getTransformer().getOriginPoints());
+        transform.setTransform(layer.getTransformer().getTransform());
+        return transform;
+    }
+
+    @Override
+    public boolean invalidBecauselayerRemoved(Layer oldLayer) {
+        return oldLayer == layer;
+    }
+
+    @Override
+    public JLabel getDescription() {
+        return new JLabel(
+                tr("PicLayer: {0}", actionName),
+                ImageProvider.get("layericon.png"),
+                JLabel.HORIZONTAL);
+    }
+
+    private boolean alreadyAdded = false;
+    public void addIfChanged() {
+
+        afterTransform = extractTransform();
+
+        boolean changed = !(beforeTransform.getTransform().equals(afterTransform.getTransform())) ||
+            !(beforeTransform.getOriginPoints().equals(afterTransform.getOriginPoints()));
+        if (changed && !alreadyAdded) {
+            Main.main.undoRedo.add(this);
+            alreadyAdded = true;
+        }
+    }
+}