001// License: GPL. For details, see LICENSE file.
002package org.openstreetmap.josm.actions;
003
004import static org.openstreetmap.josm.gui.help.HelpUtil.ht;
005import static org.openstreetmap.josm.tools.I18n.tr;
006
007import java.awt.event.ActionEvent;
008import java.awt.event.KeyEvent;
009import java.util.Collection;
010import java.util.HashSet;
011import java.util.LinkedList;
012
013import javax.swing.JOptionPane;
014
015import org.openstreetmap.josm.Main;
016import org.openstreetmap.josm.command.Command;
017import org.openstreetmap.josm.command.MoveCommand;
018import org.openstreetmap.josm.command.SequenceCommand;
019import org.openstreetmap.josm.data.osm.Node;
020import org.openstreetmap.josm.data.osm.OsmPrimitive;
021import org.openstreetmap.josm.data.osm.Way;
022import org.openstreetmap.josm.gui.Notification;
023import org.openstreetmap.josm.tools.Shortcut;
024
025/**
026 * Mirror the selected nodes or ways along the vertical axis
027 *
028 * Note: If a ways are selected, their nodes are mirrored
029 *
030 * @author Teemu Koskinen, based on much copy&Paste from other Actions.
031 */
032public final class MirrorAction extends JosmAction {
033
034    public MirrorAction() {
035        super(tr("Mirror"), "mirror", tr("Mirror selected nodes and ways."),
036                Shortcut.registerShortcut("tools:mirror", tr("Tool: {0}", tr("Mirror")),
037                        KeyEvent.VK_M, Shortcut.SHIFT), true);
038        putValue("help", ht("/Action/Mirror"));
039    }
040
041    @Override
042    public void actionPerformed(ActionEvent e) {
043        Collection<OsmPrimitive> sel = getCurrentDataSet().getSelected();
044        HashSet<Node> nodes = new HashSet<Node>();
045
046        for (OsmPrimitive osm : sel) {
047            if (osm instanceof Node) {
048                nodes.add((Node)osm);
049            } else if (osm instanceof Way) {
050                nodes.addAll(((Way)osm).getNodes());
051            }
052        }
053
054        if (nodes.isEmpty()) {
055            new Notification(
056                    tr("Please select at least one node or way."))
057                    .setIcon(JOptionPane.INFORMATION_MESSAGE)
058                    .setDuration(Notification.TIME_SHORT)
059                    .show();
060            return;
061        }
062
063        double minEast = 20000000000.0;
064        double maxEast = -20000000000.0;
065        for (Node n : nodes) {
066            double east = n.getEastNorth().east();
067            minEast = Math.min(minEast, east);
068            maxEast = Math.max(maxEast, east);
069        }
070        double middle = (minEast + maxEast) / 2;
071
072        Collection<Command> cmds = new LinkedList<Command>();
073
074        for (Node n : nodes) {
075            cmds.add(new MoveCommand(n, 2 * (middle - n.getEastNorth().east()), 0.0));
076        }
077
078        Main.main.undoRedo.add(new SequenceCommand(tr("Mirror"), cmds));
079        Main.map.repaint();
080    }
081
082    @Override
083    protected void updateEnabledState() {
084        if (getCurrentDataSet() == null) {
085            setEnabled(false);
086        } else {
087            updateEnabledState(getCurrentDataSet().getSelected());
088        }
089    }
090
091    @Override
092    protected void updateEnabledState(Collection<? extends OsmPrimitive> selection) {
093        setEnabled(selection != null && !selection.isEmpty());
094    }
095}