rendering html into image

[viju vi]

Does anyone have any idea on how to render html page into an thumbnail image... please a little help will be helpfull.

[Craig Wood]

import java.awt.*;
import java.awt.geom.AffineTransform;
import java.awt.image.BufferedImage;
import javax.swing.*;
 
public class ThumbShot {
    JLabel label;
 
    private JScrollPane getContent() {
        label = new JLabel();
        return new JScrollPane(label);
    }
 
    private BufferedImage shoot() {
        GraphicsEnvironment ge = GraphicsEnvironment.getLocalGraphicsEnvironment();
        GraphicsDevice gd = ge.getDefaultScreenDevice();
        GraphicsConfiguration gc = gd.getDefaultConfiguration();
        Rectangle r = gc.getBounds();
        System.out.printf("r   = [%d, %d, %d, %d]%n",
                           r.x, r.y, r.width, r.height);
        Rectangle max = ge.getMaximumWindowBounds();
        System.out.printf("max = [%d, %d, %d, %d]%n",
                           max.x, max.y, max.width, max.height);
        Insets insets = Toolkit.getDefaultToolkit().getScreenInsets(gc);
        System.out.printf("insets = [%d, %d, %d, %d]%n",
                            insets.top, insets.left, insets.bottom, insets.right);
        BufferedImage image = null;
        try {
            Robot robot = new Robot();
            image = robot.createScreenCapture(max);
            label.setIcon(new ImageIcon(image));
        } catch(AWTException e) {
            System.out.println("AWT error: " + e.getMessage());
        }
        Frame f = (Frame)SwingUtilities.windowForComponent(label);
        if(f.getExtendedState() == Frame.ICONIFIED)
            f.setExtendedState(Frame.NORMAL);
        else
            f.toFront();
        return image;
    }
 
    private void test() {
        Thread thread = new Thread(new Runnable() {
            public void run() {
                int count = 5;
                while(count-- > 0) {
                    System.out.println("count = " + count);
                    try {
                        Thread.sleep(1000);
                    } catch(InterruptedException e) {
                        System.out.println("interrupted at count = " + count);
                        break;
                    }
                }
                BufferedImage image = shoot();
                showThumbnail(image);
            }
        });
        thread.setPriority(Thread.NORM_PRIORITY);
        thread.start();
    }
 
    private void showThumbnail(BufferedImage image) {
         int w = image.getWidth();
         int h = image.getHeight();
         int thumbWidth  = 125;
         int thumbHeight = 100;
         double xScale = (double)thumbWidth/w;
         double yScale = (double)thumbHeight/h;
         double scale = Math.min(xScale, yScale);
         double x = (thumbWidth - scale*w)/2;
         double y = (thumbHeight - scale*h)/2;
         AffineTransform at = AffineTransform.getTranslateInstance(x, y);
         at.scale(scale, scale);
         BufferedImage thumb = new BufferedImage(thumbWidth,
                                       thumbHeight, image.getType());
         Graphics2D g2 = thumb.createGraphics();
         g2.setRenderingHint(RenderingHints.KEY_INTERPOLATION,
                             RenderingHints.VALUE_INTERPOLATION_BICUBIC);
         g2.setBackground(UIManager.getColor("Panel.background"));
         g2.clearRect(0, 0,thumbWidth, thumbHeight);
         g2.drawRenderedImage(image, at);
         g2.dispose();
         JOptionPane.showMessageDialog(null, new ImageIcon(thumb), "", -1);
    }
 
    public static void main(String[] args) {
        ThumbShot test = new ThumbShot();
        JFrame f = new JFrame();
        f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        f.setContentPane(test.getContent());
        f.setSize(400,400);
        f.setLocation(200,200);
        f.setVisible(true);
        test.test();
    }
}

[Ilja Preuss]

Use a component that can render HTML - for example a JEditorPane. Render that component into a BufferedImage. Scale the BufferedImage. That's about it.

Does that help?