source: josm/src/org/openstreetmap/josm/command/MoveCommand.java@ 23

package org.openstreetmap.josm.command;

import java.awt.Component;
import java.util.Collection;

import javax.swing.JLabel;

import org.openstreetmap.josm.data.osm.Node;
import org.openstreetmap.josm.data.osm.OsmPrimitive;
import org.openstreetmap.josm.data.osm.visitor.AllNodesVisitor;

/**
 * MoveCommand moves a set of OsmPrimitives along the map. It can be moved again
 * to collect several MoveCommands into one command.
 * 
 * @author imi
 */
public class MoveCommand implements Command {

        /**
         * The objects that should be moved.
         */
        private Collection<OsmPrimitive> objects;
        /**
         * x difference movement. Coordinates are in northern/eastern 
         */
        private double x;
        /**
         * y difference movement. Coordinates are in northern/eastern 
         */
        private double y;

        /**
         * Create a MoveCommand and assign the initial object set and movement vector.
         */
        public MoveCommand(Collection<OsmPrimitive> objects, double x, double y) {
                this.objects = objects;
                this.x = x;
                this.y = y;
        }

        /**
         * Move the objects additional to the current movement.
         */
        public void move(double x, double y) {
                this.x += x;
                this.y += y;
        }

        public void executeCommand() {
                AllNodesVisitor visitor = new AllNodesVisitor();
                for (OsmPrimitive osm : objects)
                        osm.visit(visitor);
                for (Node n : visitor.nodes) {
                        n.coor.x += x;
                        n.coor.y += y;
                }
        }

        public Component commandDescription() {
                String xstr = Math.abs(x) + (x < 0 ? "W" : "E");
                String ystr = Math.abs(y) + (y < 0 ? "S" : "N");
                return new JLabel("Move "+objects.size()+" primitives "+xstr+" "+ystr);
        }

        public void fillModifiedData(Collection<OsmPrimitive> modified, Collection<OsmPrimitive> deleted, Collection<OsmPrimitive> added) {
                if (modified != null)
                        for (OsmPrimitive osm : objects)
                                if (!modified.contains(osm))
                                        modified.add(osm);
        }
}