/*

 * %W% %E% %U%

 *

 * Copyright (c) 2000 Sun Microsystems, Inc. All Rights Reserved.

 *

 * Sun grants you ("Licensee") a non-exclusive, royalty free, license to use,

 * modify and redistribute this software in source and binary code form,

 * provided that i) this copyright notice and license appear on all copies of

 * the software; and ii) Licensee does not utilize the software in a manner

 * which is disparaging to Sun.

 *

 * This software is provided "AS IS," without a warranty of any kind. ALL

 * EXPRESS OR IMPLIED CONDITIONS, REPRESENTATIONS AND WARRANTIES, INCLUDING ANY

 * IMPLIED WARRANTY OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE OR

 * NON-INFRINGEMENT, ARE HEREBY EXCLUDED. SUN AND ITS LICENSORS SHALL NOT BE

 * LIABLE FOR ANY DAMAGES SUFFERED BY LICENSEE AS A RESULT OF USING, MODIFYING

 * OR DISTRIBUTING THE SOFTWARE OR ITS DERIVATIVES. IN NO EVENT WILL SUN OR ITS

 * LICENSORS BE LIABLE FOR ANY LOST REVENUE, PROFIT OR DATA, OR FOR DIRECT,

 * INDIRECT, SPECIAL, CONSEQUENTIAL, INCIDENTAL OR PUNITIVE DAMAGES, HOWEVER

 * CAUSED AND REGARDLESS OF THE THEORY OF LIABILITY, ARISING OUT OF THE USE OF

 * OR INABILITY TO USE SOFTWARE, EVEN IF SUN HAS BEEN ADVISED OF THE

 * POSSIBILITY OF SUCH DAMAGES.

 *

 * This software is not designed or intended for use in on-line control of

 * aircraft, air traffic, aircraft navigation or aircraft communications; or in

 * the design, construction, operation or maintenance of any nuclear

 * facility. Licensee represents and warrants that it will not use or

 * redistribute the Software for such purposes.

 */



/**

 *  Example display class Swing Component that is able

 *  to contain an image.  The size of the image

 *  and size of the container can be different.

 *  The image can be positioned within the

 *  container.  This class extends JPanel in order

 *  to support layout management.  Tiling is supported

 *  as of JDK1.3 via drawRenderedImage().

 *

 *  @author Dennis Sigel

 *

 *  @see javax.swing.JPanel

 *  @see javax.swing.JComponent

 *  @see java.awt.image.RenderedImage

 */



import java.awt.Insets;

import java.awt.Point;

import java.awt.Rectangle;

import java.awt.Graphics;

import java.awt.Graphics2D;

import java.awt.Dimension;

import java.awt.geom.AffineTransform;

import java.awt.image.RenderedImage;

import javax.swing.*;





public class DisplayJAI extends JPanel {



    protected AffineTransform affineTrans;

    protected JScrollPane sp;



    /** image to display */

    protected RenderedImage source = null;



    /** image origin relative to panel origin */

    protected int originX = 0;

    protected int originY = 0;



    protected double sx, sy;



    /** default constructor */

    public DisplayJAI() {

        super();

        setLayout(null);

    }



    /** constructor with given image */

    public DisplayJAI(RenderedImage image) {

        super();

        setLayout(null);

        source = image;

        setPreferredSize(new Dimension(source.getWidth(),

                                       source.getHeight()));

    }



    public void scale(double scaleFactor) {

        if ( (sx != 0) && (sy != 0) && (scaleFactor != 1) ) {

           sx *= scaleFactor;

           sy *= scaleFactor;

        }

        else {

           sx = scaleFactor;

           sy = scaleFactor;

        }

        repaint();

        setPreferredSize( new Dimension( (int)(sx * source.getWidth()),

                                          (int)(sy * source.getHeight()) ) );

        sp.revalidate();

    }



    /** move image within it's container */

    public void setOrigin(int x, int y) {

        originX = x;

        originY = y;

        repaint();

    }



    /** get the image origin */

    public Point getOrigin() {

        return new Point(originX, originY);

    }



    /** use to display a new image */

    public void setImage(RenderedImage im) {

        source = im;

        repaint();

    }



    public void setScrollPane(JScrollPane scrollP) {

    	sp = scrollP;

    }



    /** @returns the Image */

    public RenderedImage getImage() {

        return source;

    }



    /** paint routine */

    public synchronized void paintComponent(Graphics g) {



        Graphics2D g2d = (Graphics2D)g;



        // empty component (no image)

        if ( source == null ) {

            g2d.setColor(getBackground());

            g2d.fillRect(0, 0, getWidth(), getHeight());

            return;

        }



        // account for borders

        Insets insets = getInsets();

        int tx = insets.left + originX;

        int ty = insets.top  + originY;



        // clear damaged component area

        Rectangle clipBounds = g2d.getClipBounds();

        g2d.setColor(getBackground());

        g2d.fillRect(clipBounds.x,

                     clipBounds.y,

                     clipBounds.width,

                     clipBounds.height);



        /**

            Translation moves the entire image within the container

        */

        affineTrans = new AffineTransform();

        affineTrans.setTransform( AffineTransform.getTranslateInstance(tx, ty) );

        if ( (sx != 0) && (sy != 0) )

           affineTrans.scale(sx, sy);

        g2d.drawRenderedImage(source, affineTrans);

    }

}