/**

 *  Apple Worldwide Developer Technical Support

 *

 *  Sample demonstrating offscreen drawing in Java.

 *

 *  by Levi Brown, Apple Developer Technical Support

 *

 *  File:   BufferedImage.java

 *

 *  Copyright ©1999 Apple Computer, Inc.

 *  All rights reserved.

 *

 *  4/99    v. 1.0  Shipped as 'Magic Oracle AppleScript for Java' sample.

 *

 *  You may incorporate this sample code into your applications without

 *  restriction, though the sample code has been provided "AS IS" and the

 *  responsibility for its operation is 100% yours.  However, what you are

 *  not permitted to do is to redistribute the source as "Apple Sample

 *  Code" after having made changes. If you're going to re-distribute the

 *  source, we require that you make it clear in the source that the code

 *  was descended from Apple Sample Code, but that you've made changes.

**/

import java.awt.*;

/**

 * @author Levi Brown

 * @author Apple Worldwide Developer Technical Support

 * @author Apple Computer Inc.

 */

public class BufferedImage extends BufferedDrawer

{

    public BufferedImage()

    {

        image = null;

        imageLoc = new Point(0, 0);

        imageSize = new Dimension(0, 0);

    }

    public void setImage(Image image)

    {

        if (image != null)

        {

            this.image = image;

            imageSize.width = image.getWidth(this);

            imageSize.height = image.getHeight(this);

        }

    }

    public Image getImage()

    {

        return image;

    }

    public void setImageLocation(Point loc)

    {

        if (!imageLoc.equals(loc))

        {

            imageLoc = loc;

            draw();

        }

    }

    public Point getImageLocation()

    {

        return imageLoc;

    }

    public Dimension getImageSize()

    {

        return imageSize;

    }

    /** 

     * Returns the preferred size of this component.

     * @see #getMinimumSize

     * @see LayoutManager

     */

    public Dimension getPreferredSize()

    {

        if (image == null)

        {

            return super.getPreferredSize();

        }

        else

        {

            return getImageSize();

        }

    }

    /**

     * Handles drawing the desired content into the offscreen buffer.

     * Override this to do your own drawing (be sure to call super.draw()).

     * @see #paint

     */

    protected void draw()

    {

        super.draw();

        if (image != null)

        {

            Dimension s = getSize();

            workingGraphics.setColor(getBackground());

            workingGraphics.fillRect(0, 0, s.width, s.height);

            workingGraphics.drawImage(image, imageLoc.x, imageLoc.y, this);

        }

    }

    protected Image image;

    protected Point imageLoc;

    protected Dimension imageSize;

    /**

     * Notifies the Component that it has been added to a container

     * and if a peer is required, it should be created.

     * This method should be called by Container.add, and not by user

     * code directly.

     * @see #removeNotify

     */

    public void addNotify()

    {

        super.addNotify();

        if (image != null)

        {

            Dimension size = getSize();

            setImageLocation(new Point((size.width - imageSize.width) >> 1, (size.height - imageSize.height) >> 1));

        }

    }

}