Source Code : Reading a gif image with ImageIO.read and display it on screen

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Reading a gif image with ImageIO.read and display it on screen

  
/*
   This program is a part of the companion code for Core Java 8th ed.
   (http://horstmann.com/corejava)

   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 3 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, see <http://www.gnu.org/licenses/>.
*/

import java.awt.EventQueue;
import java.awt.Graphics;
import java.awt.Image;
import java.io.File;
import java.io.IOException;

import javax.imageio.ImageIO;
import javax.swing.JComponent;
import javax.swing.JFrame;

/**
 * @version 1.33 2007-04-14
 * @author Cay Horstmann
 */
public class ImageTest
{
   public static void main(String[] args)
   {
      EventQueue.invokeLater(new Runnable()
         {
            public void run()
            {
               ImageFrame frame = new ImageFrame();
               frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
               frame.setVisible(true);
            }
         });
   }
}

/**
 * A frame with an image component
 */
class ImageFrame extends JFrame
{
   public ImageFrame()
   {
      setTitle("ImageTest");
      setSize(DEFAULT_WIDTH, DEFAULT_HEIGHT);

      // add component to frame

      ImageComponent component = new ImageComponent();
      add(component);
   }

   public static final int DEFAULT_WIDTH = 300;
   public static final int DEFAULT_HEIGHT = 200;
}

/**
 * A component that displays a tiled image
 */
class ImageComponent extends JComponent
{
   public ImageComponent()
   {
      // acquire the image
      try
      {
         image = ImageIO.read(new File("blue-ball.gif"));
      }
      catch (IOException e)
      {
         e.printStackTrace();
      }
   }

   public void paintComponent(Graphics g)
   {
      if (image == null) return;

      int imageWidth = image.getWidth(this);
      int imageHeight = image.getHeight(this);

      // draw the image in the upper-left corner

      g.drawImage(image, 0, 0, null);
      // tile the image across the component

      for (int i = 0; i * imageWidth <= getWidth(); i++)
         for (int j = 0; j * imageHeight <= getHeight(); j++)
            if (i + j > 0) g.copyArea(0, 0, imageWidth, imageHeight, i * imageWidth, j
                  * imageHeight);
   }

   private Image image;
}

   
    
  

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