imagethumbpanel.java

基于MPEG 7 标准,符合未来语义网架构,很值得参考

/*
 * This file is part of Caliph & Emir.
 *
 * Caliph & Emir 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.
 *
 * Caliph & Emir 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 Caliph & Emir; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 *
 * Copyright statement:
 * --------------------
 * (c) 2002-2005 by Mathias Lux ([e-mail])
 * http://www.juggle.at, http://caliph-emir.sourceforge.net
 */
package at.lux.components;

import at.lux.fotoannotation.AnnotationFrame;

import javax.swing.*;
import java.awt.*;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import java.awt.image.BufferedImage;
import java.text.DecimalFormat;

/**
 * Allows the preview of an image
 * @author Mathias Lux, [e-mail]
 */

public class ImageThumbPanel extends JPanel {
    private static int EMPTY_BORDER = 10;
    private Image img = null;
    private BufferedImage orig;
    private int imgWidth, imgHeight;
    private DecimalFormat df;
    private double factor;
    private boolean rescale;
    private BufferedImage toPaint;
    private int x;
    private int y;
    private boolean wait = false;
    private int bitsPerPixel;

    public ImageThumbPanel() {
        super();
        addMouseListener(new MouseAdapter() {
            public void mouseClicked(MouseEvent event) {
                if (event.getButton() == MouseEvent.BUTTON1) {
                    showImage();
                } else if (event.getButton() == MouseEvent.BUTTON3) {
                    rescale = true;
                    repaint();
                }
            }
        });
        df = (DecimalFormat) DecimalFormat.getInstance();
        df.setMaximumFractionDigits(1);
        rescale = true;
        bitsPerPixel = GraphicsEnvironment.getLocalGraphicsEnvironment().getDefaultScreenDevice().getDisplayMode().getBitDepth();
        this.setMinimumSize(new Dimension(120, 90));
    }


    public void setImage(BufferedImage img) {
        orig = img;
        int bits = img.getColorModel().getPixelSize();
        this.img = img;
        if (bits != bitsPerPixel) {
            debug("setting colormode from " + bits + " to " + bitsPerPixel);
            BufferedImage tmp = this.getGraphicsConfiguration().createCompatibleImage(img.getWidth(), img.getHeight());
            Graphics gTemp = tmp.getGraphics();
            debug("drawing new image");
            gTemp.drawImage(img, 0, 0, null);
            img = tmp;
            debug("finished new image");
        }
        imgWidth = this.img.getWidth(this);
        imgHeight = this.img.getHeight(this);
        rescale = true;
        repaint();
    }

    public void paint(Graphics graphics) {
        // super.paint(graphics);
        Graphics2D g2 = (Graphics2D) graphics;
        g2.clearRect(0, 0, this.getWidth(), this.getHeight());

        if (img != null & !wait) {
            long mtime = System.currentTimeMillis();
            if (rescale) {
                debug("rescaling image to drawable size... ");
                factor = Math.max((double) imgWidth / ((double) (this.getWidth() - EMPTY_BORDER)),
                        (double) imgHeight / ((double) (this.getHeight() - EMPTY_BORDER)));
                x = (int) (imgWidth / factor);
                y = (int) (imgHeight / factor);
                toPaint = this.getGraphicsConfiguration().createCompatibleImage(x, y);
                toPaint.getGraphics().drawImage(img, 0, 0, x, y, null);
                rescale = false;
                debug("finished rescaling");
            }
            debug("painting image to panel ... ");
            g2.drawImage(toPaint, (getWidth() - x) / 2, (getHeight() - y) / 2, null);
            debug("finished painting");
            mtime = System.currentTimeMillis() - mtime;
            debug("Painting & scaling lasted " + mtime + " ms");
        } else {
            g2.drawRect(10, 10, this.getWidth() - 20, this.getHeight() - 20);
            g2.drawLine(10, 10, this.getWidth() - 10, this.getHeight() - 10);
            g2.drawLine(10, this.getHeight() - 10, this.getWidth() - 10, 10);
        }

        debug("Ressources: " + df.format(Runtime.getRuntime().freeMemory() / (1024.0 * 1024.0)) + "M of "
                + df.format(Runtime.getRuntime().totalMemory() / (1024.0 * 1024.0)) + "M");
    }

    private void showImage() {
        if (img != null) {
            ViewImageDialog d = new ViewImageDialog(orig);
            d.setVisible(true);
            // JOptionPane.showMessageDialog(this, "Image");
        }
    }

    public void redrawImage() {
        rescale = true;
        repaint();
    }

    public void setWait(boolean wait) {
        this.wait = wait;
    }

    private void debug(String message) {
        if (AnnotationFrame.DEBUG) System.out.println("[at.lux.fotoannotation.ImageThumbPanel] " + message);
    }

    /**
     * returns the full size image, which is currently previewed.
     * @return the currently previewed image.
     */
    public BufferedImage getImage() {
        return orig;
    }
}