/*
* IconDisplayer.java is a 1.4 application that requires the following files:
* images/rocketship.gif
*/
import java.awt.AlphaComposite;
import java.awt.BorderLayout;
import java.awt.Dimension;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.Insets;
import java.awt.Rectangle;
import javax.swing.BorderFactory;
import javax.swing.Icon;
import javax.swing.ImageIcon;
import javax.swing.JComponent;
import javax.swing.JFrame;
/*
* 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("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();
}
});
}
}I used JCreator and the build was not problem except,
Couldn't find file: rocketship.gif
Process completed.
Where to place the image folder? Please Advise. Thanks.
