So this is what you need to do.
You need to save the first
JPanel
'sGraphics
context to aBufferedImage
. Here is a helper method, I used in the example program belowBufferedImage bi; .... private void setImage(JPanel panel) { Dimension d = panel.getPreferredSize(); int w = (int)d.getWidth(); int h =(int)d.getHeight(); bi = new BufferedImage(w, h, BufferedImage.TYPE_INT_RGB); Graphics2D g = bi.createGraphics(); panel.paint(g); g.dispose(); }
This saves the entire
JPanel
to aBufferedImage
.Use that
BufferedImage
to paint on the secondJPanel
. Use whatever coordinates you want. Use this method fromGraphics
classpublic abstract boolean drawImage(Image img, int dx1, int dy1, int dx2, int dy2, int sx1, int sy1, int sx2, int sy2, ImageObserver observer)
img - the specified image to be drawn. This method does nothing if img is null.
dx1 - the x coordinate of the first corner of the destination rectangle.
dy1 - the y coordinate of the first corner of the destination rectangle.
dx2 - the x coordinate of the second corner of the destination rectangle.
dy2 - the y coordinate of the second corner of the destination rectangle.
sx1 - the x coordinate of the first corner of the source rectangle.
sy1 - the y coordinate of the first corner of the source rectangle.
sx2 - the x coordinate of the second corner of the source rectangle.
sy2 - the y coordinate of the second corner of the source rectangle.
observer - object to be notified as more of the image is scaled and converted.g.drawImage(bi, 0, 0, 200, 200, 0, 0, 50, 50, this);
Here's the result
Here's the full code
import java.awt.Dimension;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.image.BufferedImage;
import java.io.IOException;
import java.net.MalformedURLException;
import java.net.URL;
import javax.imageio.ImageIO;
import javax.swing.BorderFactory;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JSplitPane;
import javax.swing.SwingUtilities;
public class TestTwoPanels {
public static void main(String[] args) {
SwingUtilities.invokeLater(new Runnable() {
public void run() {
JPanel panel = new JPanel();
PanelTwo panelTwo = new PanelTwo();
PanelOne panelOne = new PanelOne(panelTwo);
JSplitPane split = new JSplitPane(
JSplitPane.HORIZONTAL_SPLIT, panelOne, panelTwo);
panel.add(split);
JFrame frame = new JFrame("Test Graphics");
frame.add(panel);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.pack();
frame.setLocationRelativeTo(null);
frame.setVisible(true);
}
});
}
private static class PanelOne extends JPanel {
Dimension size;
BufferedImage image;
PanelTwo panelTwo;
public PanelOne(PanelTwo panelTwo) {
this.panelTwo = panelTwo;
try {
URL url = new URL("http://swoo.co.uk/content/images/icons/stackoverflow.png");
image = ImageIO.read(url);
} catch (MalformedURLException ex) {
ex.printStackTrace();
} catch (IOException ex) {
ex.printStackTrace();
}
setBorder(BorderFactory.createEmptyBorder(10, 10, 10, 10));
panelTwo.setImage(PanelOne.this);
panelTwo.repaint();
}
@Override
public void paint(Graphics g) {
super.paint(g);
g.drawImage(image, 0, 0, this);
}
@Override
public Dimension getPreferredSize() {
return new Dimension(250, 250);
}
}
private static class PanelTwo extends JPanel {
BufferedImage bi;
public PanelTwo() {
setBorder(BorderFactory.createEmptyBorder(10, 10, 10, 10));
}
public void setImage(BufferedImage image) {
this.bi = image;
}
private void setImage(JPanel panel) {
Dimension d = panel.getPreferredSize();
int w = (int)d.getWidth();
int h =(int)d.getHeight();
System.out.println(d);
bi = new BufferedImage(w, h, BufferedImage.TYPE_INT_RGB);
Graphics2D g = bi.createGraphics();
panel.paint(g);
g.dispose();
}
@Override
protected void paintComponent(Graphics g) {
super.paintComponent(g);
g.drawImage(bi, 25, 25, 225, 225, 50, 50, 175, 175, this);
}
@Override
public Dimension getPreferredSize() {
return new Dimension(250, 250);
}
}
}