import java.awt.*;
import java.net.URL;
import javax.swing.*;

/** displays an image in a panel.  from Liang, pp 522-524 */
public class ImageViewer extends JPanel {
    /** hold value of property image */
    private java.awt.Image image;
    private String imageFilename = "";
    private boolean stretched = true;
    private int xCoordinate;
    private int yCoordinate;
        
    public ImageViewer() {
    }
        
    public ImageViewer(Image image) {
        this.image = image;
        repaint();
    }
        
    /** creates an image icon from a local file name */
    public static ImageIcon createImageIcon(String imageFilename, Object object) {
        URL url = object.getClass().getResource(imageFilename);
        return new ImageIcon(url);
    }
        
    /** create an image from a local file name */
    public static Image createImage(String imageFilename, Object object) {
        ImageIcon imageIcon = createImageIcon(imageFilename, object);
        if (imageIcon != null)
            return imageIcon.getImage();
        else
            return null;
    }
        
    /** create an image icon from an Internet URL string */
    public static ImageIcon createImageIcon(String urlString) {
        return new ImageIcon(getURL(urlString));
    }
        
    /** create an image from a URL string */
    public static Image createImage(String urlString) {
        return new ImageIcon(getURL(urlString)).getImage();
    }
        
    private static URL getURL(String urlString) {
        URL url = null;
        try {
            url = new URL(urlString);
        }
        catch (java.net.MalformedURLException ex) {
            ex.printStackTrace();
        }
        return url;
    }
        
    protected void paintComponent(Graphics g) {
        super.paintComponent(g);
                
        if (image != null)
            if (isStretched())
                g.drawImage(image, xCoordinate, yCoordinate,
                            getSize().width, getSize().height, this);
            else
                g.drawImage(image, xCoordinate, yCoordinate, this);
    }
        
    /** return value of property image */
    public java.awt.Image getImage() {
        return image;
    }
        
    /** set a new value for property image */
    public void setImage(java.awt.Image image) {
        this.image = image;
        repaint();
    }
        
    /** return value of property imagefilename */
    public String getImageFilename() {
        return imageFilename;
    }
        
    /** set a new value for property imagefilename */
    public void setImageFilename(String imageFilename) {
        this.imageFilename = imageFilename;
        image = createImage(imageFilename, this);
        repaint();
    }
        
    /** return value of property stretched */
    public boolean isStretched () {
        return stretched;
    }
        
    /** set a new value for property stretched */
    public void setStretched(boolean stretched) {
        this.stretched = stretched;
        repaint();
    }
        
    /** return value of property xCoordinate */
    public int getXCoordinate() {
        return xCoordinate;
    }
        
    public int getYCoordinate() {
        return yCoordinate;
    }
        
    /** set a new value for property ycoordinate */
    public void setYCoordinate(int yCoordinate) {
        this.yCoordinate = yCoordinate;
        repaint();
    }
}