ZoomPanel.java
package ac.essex.ooechs.imaging.commons.apps.display;
import javax.swing.*;
import java.awt.image.BufferedImage;
import java.awt.*;
/**
* <p/>
* 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 2
* of the License, or (at your option) any later version,
* provided that any use properly credits the author.
* 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 at http://www.gnu.org
* </p>
*
* @author Olly Oechsle, University of Essex, Date: 11-Dec-2006
* @version 1.0
*/
public class ZoomPanel extends JPanel {
protected int windowWidth;
protected int windowHeight;
protected BufferedImage img = null;
protected int x = 0;
protected int y = 0;
public ZoomPanel(int windowWidth, int windowHeight) {
setSize(windowWidth, windowHeight);
}
public void setSize(int windowWidth, int windowHeight) {
this.windowWidth = windowWidth / 2;
this.windowHeight = windowHeight / 2;
}
public void update(int x, int y) {
this.x = x;
this.y = y;
repaint();
}
public BufferedImage getImage() {
return img;
}
public void setImage(BufferedImage img) {
this.img = img;
}
public void paintComponent(Graphics g) {
super.paintComponent(g);
if (img != null) {
g.drawImage(img, 0, 0, getWidth(), getHeight(), x - windowWidth, y - windowHeight, x + windowWidth, y + windowHeight, this);
g.setColor(Color.WHITE);
g.drawLine(getWidth() / 2, 0, getWidth() / 2, getHeight());
g.drawLine(0, getHeight() / 2, getWidth(), getHeight() / 2);
} else {
g.setColor(Color.BLACK);
g.fillRect(0, 0, getWidth(), getHeight());
}
}
}