source: josm/trunk/src/org/openstreetmap/josm/gui/layer/markerlayer/ImageMarker.java@ 1847

// 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, MarkerLayer parentLayer, double time, double offset) {
        try {
            return new ImageMarker(ll, new URL(url), parentLayer, time, offset);
        } catch (Exception ex) {
            return null;
        }
    }

    private ImageMarker(LatLon ll, URL imageUrl, MarkerLayer parentLayer, double time, double offset) {
        super(ll, "photo.png", parentLayer, time, 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.toFront();
        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));
    }

}