source: josm/trunk/src/org/openstreetmap/josm/gui/layer/markerlayer/ImageMarker.java@ 547

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

import java.awt.BorderLayout;
import java.awt.Cursor;
import java.awt.Image;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.net.URL;

import javax.swing.Icon;
import javax.swing.ImageIcon;
import javax.swing.JDialog;
import javax.swing.JLabel;
import javax.swing.JOptionPane;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JToggleButton;
import javax.swing.JViewport;

import org.openstreetmap.josm.Main;
import org.openstreetmap.josm.data.coor.LatLon;
import org.openstreetmap.josm.tools.ImageProvider;

/**
 * Marker representing an image. Uses a special icon, and when clicked,
 * displays an image view dialog. Re-uses some code from GeoImageLayer.
 * 
 * @author Frederik Ramm <frederik@remote.org>
 *
 */
public class ImageMarker extends ButtonMarker {

        public URL imageUrl;

        public static ImageMarker create(LatLon ll, String url, double offset) {
                try {
                        return new ImageMarker(ll, new URL(url), offset);
                } catch (Exception ex) {
                        return null;
                }
        }

        private ImageMarker(LatLon ll, URL imageUrl, double offset) {
                super(ll, "photo.png", offset);
                this.imageUrl = imageUrl;
        }

        @Override public void actionPerformed(ActionEvent ev) {
                final JPanel p = new JPanel(new BorderLayout());
                final JScrollPane scroll = new JScrollPane(new JLabel(loadScaledImage(imageUrl, 580)));
                final JViewport vp = scroll.getViewport();
                p.add(scroll, BorderLayout.CENTER);

                final JToggleButton scale = new JToggleButton(ImageProvider.get("misc", "rectangle"));

                JPanel p2 = new JPanel();
                p2.add(scale);
                p.add(p2, BorderLayout.SOUTH);
                scale.addActionListener(new ActionListener(){
                        public void actionPerformed(ActionEvent ev) {
                                p.setCursor(Cursor.getPredefinedCursor(Cursor.WAIT_CURSOR));
                                if (scale.getModel().isSelected())
                                        ((JLabel)vp.getView()).setIcon(loadScaledImage(imageUrl, Math.max(vp.getWidth(), vp.getHeight())));
                                else
                                        ((JLabel)vp.getView()).setIcon(new ImageIcon(imageUrl));
                                p.setCursor(Cursor.getDefaultCursor());
                        }
                });
                scale.setSelected(true);
                JOptionPane pane = new JOptionPane(p, JOptionPane.PLAIN_MESSAGE);
                JDialog dlg = pane.createDialog(Main.parent, imageUrl.toString());
                dlg.setModal(false);
                dlg.setVisible(true);
        }

        private static Icon loadScaledImage(URL u, int maxSize) {
                Image img = new ImageIcon(u).getImage();
                int w = img.getWidth(null);
                int h = img.getHeight(null);
                if (w>h) {
                        h = Math.round(maxSize*((float)h/w));
                        w = maxSize;
                } else {
                        w = Math.round(maxSize*((float)w/h));
                        h = maxSize;
                }
                return new ImageIcon(img.getScaledInstance(w, h, Image.SCALE_SMOOTH));
        }

}