source: josm/trunk/src/org/openstreetmap/josm/actions/AutoScaleAction.java@ 403

// License: GPL. Copyright 2007 by Immanuel Scholz and others
package org.openstreetmap.josm.actions;

import static org.openstreetmap.josm.tools.I18n.tr;
import static org.xnap.commons.i18n.I18n.marktr;

import java.awt.event.ActionEvent;
import java.util.Collection;

import javax.swing.JOptionPane;

import org.openstreetmap.josm.Main;
import org.openstreetmap.josm.data.coor.EastNorth;
import org.openstreetmap.josm.data.coor.LatLon;
import org.openstreetmap.josm.data.osm.OsmPrimitive;
import org.openstreetmap.josm.data.osm.visitor.BoundingXYVisitor;
import org.openstreetmap.josm.gui.layer.Layer;

/**
 * Toggles the autoScale feature of the mapView
 * @author imi
 */
public class AutoScaleAction extends JosmAction {

        public static final String[] modes = {
                marktr("data"),
                marktr("selection"),
                marktr("layer"),
                marktr("conflict")
        };
        private final String mode;

        public AutoScaleAction(String mode) {
                super(tr("Zoom to {0}", mode), "dialogs/autoscale/"+mode, tr("Zoom the view to {0}.", tr(mode)), 0, 0, true);
                String modeHelp = Character.toUpperCase(mode.charAt(0))+mode.substring(1);
                putValue("help", "Action/AutoScale/"+modeHelp);
                this.mode = mode;
        }

        public void actionPerformed(ActionEvent e) {
                if (Main.map != null) {
                        BoundingXYVisitor bbox = getBoundingBox();
                        if (bbox != null) {
                                Main.map.mapView.recalculateCenterScale(bbox);
                        }
                }
                putValue("active", true);
        }

        private BoundingXYVisitor getBoundingBox() {
                BoundingXYVisitor v = new BoundingXYVisitor();
                if (mode.equals("data")) {
                        for (Layer l : Main.map.mapView.getAllLayers())
                                l.visitBoundingBox(v);
                } else if (mode.equals("layer"))
                        Main.map.mapView.getActiveLayer().visitBoundingBox(v);
                else if (mode.equals("selection") || mode.equals("conflict")) {
                        Collection<OsmPrimitive> sel = mode.equals("selection") ? Main.ds.getSelected() : Main.map.conflictDialog.conflicts.keySet();
                        if (sel.isEmpty()) {
                        JOptionPane.showMessageDialog(Main.parent,
                                        mode.equals("selection") ? tr("Nothing selected to zoom to.") : tr("No conflicts to zoom to"));
                                return null;
                        }
                        for (OsmPrimitive osm : sel)
                                osm.visit(v);
                        // special case to zoom nicely to one single node
                        if (v.min != null && v.max != null && v.min.north() == v.max.north() && v.min.east() == v.max.east()) {
                                EastNorth en = Main.proj.latlon2eastNorth(new LatLon(0.02, 0.02));
                                v.min = new EastNorth(v.min.east()-en.east(), v.min.north()-en.north());
                                v.max = new EastNorth(v.max.east()+en.east(), v.max.north()+en.north());
                        }
                }
                return v;
        }
}