package examples;
// Picture.java
// Kenneth J. Goldman

/*****************************************************************
 * When you call the constructor, pass in a String that's the
 * name of the image file, such as
 *    Picture car = new Picture("redTractor.gif");
 * and then you can move the Picture by calling its
 * setLocation method, such as
 *    car.setLocation(x,y);
 *
 ****************************************************************/

import java.awt.*;
import javax.swing.*;
import java.util.*;

public class Picture extends JComponent {
	private static final long serialVersionUID = 1L;
	private static Hashtable<String,Image> imagesFromFiles = new Hashtable<String,Image>();
	Image img;
	Dimension preferredSize = new Dimension(50, 50);
	private static MediaTracker tracker;
	Image bufferedImage, bufferedClearImage;
	Graphics2D bufferedGraphics;
	int delay = 80;
        private static final AlphaComposite PAINT_RULE = AlphaComposite.SrcOver;
  private static final Color TRANSPARENT = new Color(0,0,0,0); 

	public Picture() {
		this((Image) null);
	}

	public Picture(String imageFile) {
		this();
		setImage(loadImage(imageFile,this));
	}

	public Picture(Image img) {
		setOpaque(false);
		if (img != null)
			setImage(img);
	}
	
	public void setImage(String imageFile) {
		setImage(loadImage(imageFile,this));
	}

	public synchronized void setImage(Image img) {
		this.img = img;
		bufferedGraphics = null;
		bufferedImage = null;

		if (img == null)
			preferredSize = new Dimension(0, 0);
		else
			preferredSize = new Dimension(img.getWidth(this), img.getHeight(this));
		
		setSize(preferredSize);
		repaint();
	}

	public Dimension getPreferredSize() {
		return preferredSize;
	}

	public void setBounds(int x, int y, int width, int height) {
		preferredSize = new Dimension(width, height);
		super.setBounds(x, y, width, height);
		repaint();
	}

	public void paint(Graphics g) {
	  ((Graphics2D)g).setComposite(PAINT_RULE);
	  if (bufferedGraphics != null) {
	    g.drawImage(bufferedImage,
			0,
			0,
			preferredSize.width,
			preferredSize.height,
			this);
	  } else if (img != null) {
	    g.drawImage(img,
			0,
			0,
			preferredSize.width,
			preferredSize.height,
			this);
	  }
	}

	public static synchronized Image loadImage(String imageFile, Picture pc) {
		if (imagesFromFiles.containsKey(imageFile)) {
			return imagesFromFiles.get(imageFile);
		} else {
			try {
				Image img = Toolkit.getDefaultToolkit().getImage(imageFile);
				if (tracker == null)
					tracker = new MediaTracker(pc);
				tracker.addImage(img, 1);
				tracker.waitForAll();
				imagesFromFiles.put(imageFile, img);
				return img;
			} catch (InterruptedException ioe) {
				System.err.println(
					"Couldn't load image from file " + imageFile);
				return null;
			}
		}
	}

	public synchronized final boolean imageUpdate(final Image img, final int infoflags, int x, int y, final int width, final int height) {
		if (this.img == img) {
			if (isShowing()
				&& ((infoflags & ALLBITS) != 0)
				|| ((infoflags & FRAMEBITS) != 0)) {
				if (bufferedGraphics == null) {
					// bufferedImage = createImage(width, height);
					bufferedImage = new java.awt.image.BufferedImage(width, height, java.awt.image.BufferedImage.TYPE_INT_ARGB);
					bufferedClearImage = new java.awt.image.BufferedImage(width, height, java.awt.image.BufferedImage.TYPE_INT_ARGB);
					bufferedGraphics = (Graphics2D) bufferedImage.getGraphics();
					setSize(width, height);
				}
				bufferedGraphics.setBackground(TRANSPARENT);
				bufferedGraphics.setColor(TRANSPARENT);
				bufferedGraphics.clearRect(0,0,width,height);
				bufferedGraphics.setComposite(PAINT_RULE);
				bufferedGraphics.drawImage(img, 0, 0, width, height, this);
				img.getWidth(this);
			}
		} else {
		  this.img.getWidth(this); // to request an update from the right image
		} 
		return isShowing();
	}

	public static void main(String[] args) {
		JFrame f = new JFrame("test");
		f.getContentPane().setLayout(new FlowLayout());
		Picture pc = new Picture("person.jpg");
		f.add(pc);
		f.setVisible(true);
		f.addWindowListener(new java.awt.event.WindowAdapter() {
		    public void windowClosing(java.awt.event.WindowEvent we) {
		      System.exit(0);
		    }
		  });
				   
	}

}