Application: gvSIG desktop » gvSIG tools: HyperLink

/* gvSIG. Geographic Information System of the Valencian Government

 *

 * Copyright (C) 2007-2008 Infrastructures and Transports Department

 * of the Valencian Government (CIT)

 *

 * This program is free software; you can redistribute it and/or

 * modify it under the terms of the GNU General Public License

 * as published by the Free Software Foundation; either version 2

 * of the License, or (at your option) any later version.

 *

 * This program is distributed in the hope that it will be useful,

 * but WITHOUT ANY WARRANTY; without even the implied warranty of

 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

 * GNU General Public License for more details.

 *

 * You should have received a copy of the GNU General Public License

 * along with this program; if not, write to the Free Software

 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,

 * MA  02110-1301, USA.

 *

 */

package org.gvsig.hyperlink.app.extension.actions;

import java.awt.BorderLayout;

import java.awt.Dimension;

import java.awt.Graphics2D;

import java.awt.Image;

import java.awt.RenderingHints;

import java.awt.geom.AffineTransform;

import java.awt.geom.Rectangle2D;

import java.awt.image.BufferedImage;

import java.net.URI;

import javax.swing.ImageIcon;

import javax.swing.JLabel;

import org.apache.batik.bridge.BridgeContext;

import org.apache.batik.bridge.DocumentLoader;

import org.apache.batik.bridge.GVTBuilder;

import org.apache.batik.bridge.UserAgentAdapter;

import org.apache.batik.bridge.ViewBox;

import org.apache.batik.gvt.GraphicsNode;

import org.apache.batik.gvt.renderer.StaticRenderer;

import org.w3c.dom.Document;

import org.w3c.dom.Element;

import org.w3c.dom.svg.SVGDocument;

import org.gvsig.andami.PluginServices;

import org.gvsig.andami.messages.NotificationManager;

import org.gvsig.hyperlink.app.extension.AbstractHyperLinkPanel;

/**

 * This class extends AbstractHyperLink, and provides suppot to open images of

 * many formats.

 * The common supported formats are JPG, ICO, BMP, TIFF, GIF and PNG. Implements

 * methods from

 * IExtensionBuilder to make it extending.

 * 

 * @author Eustaquio Vercher (IVER)

 * @author Cesar Martinez Izquierdo (IVER)

 */

public class SvgPanel extends AbstractHyperLinkPanel {

    private static final long serialVersionUID = -5200841105188251551L;

    private GVTBuilder gvtBuilder = new GVTBuilder();

    private GraphicsNode gvtRoot = null;

    private BridgeContext ctx = null;

    private StaticRenderer renderer = new StaticRenderer();

    private Element elt;

    protected static RenderingHints defaultRenderingHints;

    static {

        defaultRenderingHints = new RenderingHints(null);

        defaultRenderingHints.put(RenderingHints.KEY_ANTIALIASING,

            RenderingHints.VALUE_ANTIALIAS_ON);

        defaultRenderingHints.put(RenderingHints.KEY_INTERPOLATION,

            RenderingHints.VALUE_INTERPOLATION_BILINEAR);

    }

    /**

     * Default constructor.

     */

    public SvgPanel(URI doc) {

        super(doc);

        initialize();

    }

    /**

     * Initializes this panel.

     */

    void initialize() {

        this.setLayout(new BorderLayout());

        showDocument();

        // this.setSize(600, 400);

    }

    /**

     * Implements the necessary code to open images in this panel.

     */

    protected void showDocument() {

        if (!checkAndNormalizeURI()) {

            return;

        }

        ImageIcon image;

        // try {

        image = new ImageIcon(getSvgAsImage(document.toString()));

        if (image == null)

            ; // Incluir error

        this.setPreferredSize(new Dimension(image.getIconWidth(),

            image.getIconHeight()));

        this.setSize(new Dimension(image.getIconWidth(), image.getIconHeight()));

        JLabel label = new JLabel(image);

        this.add(label);

        // } catch (MalformedURLException e) {

        //

        // }

    }

    /**

     * Allows paint SVG images in the panel.

     * 

     * @param file

     *            , this file has been extracted from the URI

     */

    private Image getSvgAsImage(String uri) {

        BufferedImage img =

            new BufferedImage(400, 400, BufferedImage.TYPE_INT_ARGB);

        Graphics2D g = img.createGraphics();

        Rectangle2D rect = new Rectangle2D.Double();

        rect.setFrame(0, 0, 400, 400);

        obtainStaticRenderer(uri);

        drawSVG(g, rect, null);

        return img;

    }

    /**

     * Render the image to add to the panel.

     * 

     * @param file

     *            , this file has been extracted from the URI

     */

    private void obtainStaticRenderer(String uri) {

        try {

            UserAgentAdapter userAgent = new UserAgentAdapter();

            DocumentLoader loader = new DocumentLoader(userAgent);

            ctx = new BridgeContext(userAgent, loader);

            // Document svgDoc = loader.loadDocument(file.toURI().toString());

            Document svgDoc = loader.loadDocument(uri);

            gvtRoot = gvtBuilder.build(ctx, svgDoc);

            renderer.setTree(gvtRoot);

            elt = ((SVGDocument) svgDoc).getRootElement();

        } catch (Exception ex) {

            NotificationManager.addWarning(PluginServices.getText(this,

                "Hyperlink_linked_field_doesnot_exist"), ex);

        }

    }

    /**

     * Draw SVG in the Graphics that receives like parameter.

     * 

     * @param g

     *            Graphics

     * @param rect

     *            Rectangle that fills the Graphic.

     * @param rv

     *            Rectangle. This forms the visible part in the Layout

     */

    private void drawSVG(Graphics2D g, Rectangle2D rect, Rectangle2D rv) {

        if ((rv == null) || rv.contains(rect)) {

            AffineTransform ataux = new AffineTransform();

            ataux.translate(rect.getX(), rect.getY());

            try {

                ataux.concatenate(ViewBox.getViewTransform(null,

                    elt,

                    (float) rect.getWidth(),

                    (float) rect.getHeight(),

                    ctx));

                gvtRoot.setTransform(ataux);

            } catch (Exception e) {

                // TODO: handle exception

            }

        } else {

            AffineTransform ataux = new AffineTransform();

            ataux.translate(rect.getX(), rect.getY());

            ataux.concatenate(ViewBox.getViewTransform(null,

                elt,

                (float) rect.getWidth(),

                (float) rect.getHeight(),

                ctx));

            gvtRoot.setTransform(ataux);

        }

        RenderingHints renderingHints = defaultRenderingHints;

        g.setRenderingHints(renderingHints);

        if (gvtRoot != null) {

            gvtRoot.paint(g);

        }

    }

}