/*  * IconDisplayer.java is a 1.4 application that requires the following files: *   images/rocketship.gif */import java.awt.*;import java.awt.event.*;import javax.swing.*;/*  * This component displays a single icon one or more times * in a row.  The images are right-aligned, with 5 pixels * padding in between.  All but the rightmost image are * mostly transparent. */public class IconDisplayer extends JComponent {    private Icon icon;    private int preferredNumImages = 2;    private int pad = 5; //space between images    private Rectangle iconRect = new Rectangle();    private Rectangle clipRect = new Rectangle();    public IconDisplayer(Icon icon, int preferredNumImages, int pad) {        this.icon = icon;        if (preferredNumImages > 0) {            this.preferredNumImages = preferredNumImages;        }        if (pad >= 0) {            this.pad = pad;        }                //Set a reasonable default border.        if (this.pad > 0) {            setBorder(BorderFactory.createEmptyBorder(this.pad,                                                      this.pad,                                                      this.pad,                                                      this.pad));        }    }        public Dimension getPreferredSize() {        if (icon != null) {            Insets insets = getInsets();            return new Dimension(icon.getIconWidth()                                    * preferredNumImages                                 + pad                                   * (preferredNumImages - 1)                                 + insets.left                                 + insets.right,                                 icon.getIconHeight()                                  + insets.top                                 + insets.bottom);        } else {            return new Dimension(100, 100);        }    }        public Dimension getMinimumSize() {        if (icon != null) {            Insets insets = getInsets();                        //Return enough space for one icon.            return new Dimension(icon.getIconWidth()                                 + insets.left                                 + insets.right,                                 icon.getIconHeight()                                  + insets.top                                 + insets.bottom);        } else {            return new Dimension(0,0);        }    }    protected void paintComponent(Graphics g) {        if (isOpaque()) { //paint background            g.setColor(getBackground());            g.fillRect(0, 0, getWidth(), getHeight());        }        if (icon != null) {            //Draw the icon over and over, right aligned.            Insets insets = getInsets();            int iconWidth = icon.getIconWidth();            int iconX = getWidth() - insets.right                                   - iconWidth;            int iconY = insets.top;            boolean faded = false;            //Copy the Graphics object, which is actually            //a Graphics2D object.  Cast it so we can            //set alpha composite.            Graphics2D g2d = (Graphics2D)g.create();            //Draw the icons, starting from the right.            //After the first one, the rest are faded.            //We won't bother painting icons that are clipped.            g.getClipBounds(clipRect);            while (iconX >= insets.left) {                iconRect.setBounds(iconX, iconY,                                    iconWidth,                                    icon.getIconHeight());                if (iconRect.intersects(clipRect)) {                    icon.paintIcon(this, g2d, iconX, iconY);                }                iconX -= (iconWidth + pad);                if (!faded) {                     g2d.setComposite(AlphaComposite.getInstance(                        AlphaComposite.SRC_OVER, 0.1f));                    faded = true;                }            }                        g2d.dispose(); //clean up        }    }       /** Returns an ImageIcon, or null if the path was invalid. */    protected static ImageIcon createImageIcon(String path) {        java.net.URL imgURL = IconDisplayer.class.getResource(path);        if (imgURL != null) {            return new ImageIcon(imgURL);        } else {            System.err.println("Couldn't find file: " + path);            return null;        }    }    /**     * Create the GUI and show it.  For thread safety,     * this method should be invoked from the     * event-dispatching thread.     */    private static void createAndShowGUI() {        //Make sure we have nice window decorations.        JFrame.setDefaultLookAndFeelDecorated(true);        //Create and set up the window.        JFrame frame = new JFrame("IconDisplayer");        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);        //Create and set up the content pane.        ImageIcon ship = createImageIcon("images/rocketship.gif");        IconDisplayer id = new IconDisplayer(ship, 5, -1);        frame.getContentPane().add(id, BorderLayout.CENTER);        //Display the window.        frame.pack();        frame.setVisible(true);    }    public static void main(String[] args) {        //Schedule a job for the event-dispatching thread:        //creating and showing this application's GUI.        javax.swing.SwingUtilities.invokeLater(new Runnable() {            public void run() {                createAndShowGUI();            }        });    }}