Want to translate a part of the Image to the center of the Image

import java.awt.*;

import java.awt.event.*;

import java.awt.geom.AffineTransform;

import java.awt.image.BufferedImage;

import java.io.*;

import javax.imageio.ImageIO;

import javax.swing.*;

import javax.swing.event.*;

public class RelativeCoordinates extends JPanel implements ActionListener {

BufferedImage image;

Rectangle clip = new Rectangle(100,100,100,100);

AffineTransform at = new AffineTransform();

public RelativeCoordinates(BufferedImage image) {

this.image = image;

}

public void actionPerformed(ActionEvent e) {

String ac = e.getActionCommand();

if(ac.equals("ZOOM IN"))

setTransform();

if(ac.equals("RESET"))

at.setToIdentity();

repaint();

}

protected void paintComponent(Graphics g) {

super.paintComponent(g);

Graphics2D g2 = (Graphics2D)g;

g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING,

RenderingHints.VALUE_ANTIALIAS_ON);

g2.setRenderingHint(RenderingHints.KEY_INTERPOLATION,

RenderingHints.VALUE_INTERPOLATION_BICUBIC);

g2.drawRenderedImage(image, at);

g2.setPaint(Color.red);

g2.draw(at.createTransformedShape(clip));

}

private void setTransform() {

double xScale = (double)getWidth()/(clip.width+1);

double yScale = (double)getHeight()/(clip.height+1);

double scale = Math.min(xScale, yScale); // scale to fit

Rectangle r = getBounds();

double x = r.getCenterX() - scale*clip.getCenterX();

double y = r.getCenterY() - scale*clip.getCenterY();

at.setToTranslation(x, y);

at.scale(scale, scale);

}

private JPanel getControlPanel() {

JPanel panel = new JPanel(new GridBagLayout());

GridBagConstraints gbc = new GridBagConstraints();

gbc.weightx = 1.0;

gbc.fill = GridBagConstraints.HORIZONTAL;

gbc.gridwidth = GridBagConstraints.REMAINDER;

panel.add(getZoomPanel(), gbc);

panel.add(getClipPanel(), gbc);

return panel;

}

private JPanel getZoomPanel() {

String[] ids = { "zoom in", "reset" };

JPanel panel = new JPanel();

for(int j = 0; j < ids.length; j++) {

JButton button = new JButton(ids[j]);

button.setActionCommand(ids[j].toUpperCase());

button.addActionListener(this);

panel.add(button);

}

return panel;

}

private JPanel getClipPanel() {

SpinnerNumberModel xModel = new SpinnerNumberModel(100, 0, 300, 1);

final JSpinner xSpinner = new JSpinner(xModel);

SpinnerNumberModel yModel = new SpinnerNumberModel(100, 0, 300, 1);

final JSpinner ySpinner = new JSpinner(yModel);

SpinnerNumberModel wModel = new SpinnerNumberModel(100, 50, 400, 1);

final JSpinner wSpinner = new JSpinner(wModel);

SpinnerNumberModel hModel = new SpinnerNumberModel(100, 50, 400, 1);

final JSpinner hSpinner = new JSpinner(hModel);

ChangeListener cl = new ChangeListener() {

public void stateChanged(ChangeEvent e) {

JSpinner spinner = (JSpinner)e.getSource();

int value = ((Integer)spinner.getValue()).intValue();

if(spinner == xSpinner)

clip.x = value;

if(spinner == ySpinner)

clip.y = value;

if(spinner == wSpinner)

clip.width = value;

if(spinner == hSpinner)

clip.height = value;

repaint();

}

};

JPanel panel = new JPanel(new GridBagLayout());

GridBagConstraints gbc = new GridBagConstraints();

gbc.insets = new Insets(2,2,2,2);

gbc.weightx = 1.0;

addComponents(new JLabel("x"), xSpinner, panel, gbc, cl);

addComponents(new JLabel("y"), ySpinner, panel, gbc, cl);

addComponents(new JLabel("w"), wSpinner, panel, gbc, cl);

addComponents(new JLabel("h"), hSpinner, panel, gbc, cl);

return panel;

}

private void addComponents(Component c1, Component c2, Container c,

GridBagConstraints gbc, ChangeListener cl) {

gbc.anchor = GridBagConstraints.EAST;

c.add(c1, gbc);

gbc.anchor = GridBagConstraints.WEST;

c.add(c2, gbc);

((JSpinner)c2).addChangeListener(cl);

}

public static void main(String[] args) throws IOException {

String path = "images/owls.jpg";

BufferedImage image = ImageIO.read(new File(path));

RelativeCoordinates test = new RelativeCoordinates(image);

JFrame f = new JFrame();

f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

f.getContentPane().add(test);

f.getContentPane().add(test.getControlPanel(), "Last");

f.setSize(400,400);

f.setLocation(200,200);

f.setVisible(true);

}

}

crwooda at 2007-7-13 0:38:54 >