HI Please Help me with Zoom of a buffered image

import java.awt.*;

import java.awt.event.*;

import java.awt.geom.*;

import java.awt.image.BufferedImage;

import java.util.Hashtable;

import javax.swing.*;

import javax.swing.event.*;

public class RotationZoom extends JPanel {

AffineTransform at = new AffineTransform();

Point2D.Double imageLoc = new Point2D.Double(100.0, 50.0);

Rectangle2D.Double bounds = new Rectangle2D.Double();

BufferedImage image;

double theta = 0;

double scale = 1.0;

final int PAD = 20;

public RotationZoom() {

initImage();

}

public void addNotify() {

super.addNotify();

setTransform();

}

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(bounds);

}

public Dimension getPreferredSize() {

return new Dimension((int)(imageLoc.x + Math.ceil(bounds.width)) + PAD,

(int)(imageLoc.y + Math.ceil(bounds.height)) + PAD);

}

private void update() {

setTransform();

revalidate();

repaint();

}

private void setTransform() {

int iw = image.getWidth();

int ih = image.getHeight();

double cos = Math.abs(Math.cos(theta));

double sin = Math.abs(Math.sin(theta));

double width = iw*cos + ih*sin;

double height = ih*cos + iw*sin;

at.setToTranslation(imageLoc.x, imageLoc.y);

at.rotate(theta, scale*iw/2.0, scale*ih/2.0);

at.scale(scale, scale);

double x = imageLoc.x - scale*(width - iw)/2.0;

double y = imageLoc.y - scale*(height - ih)/2.0;

bounds.setFrame(x, y, scale*width, scale*height);

}

private void initImage() {

int w = 240, h = 180;

int type = BufferedImage.TYPE_INT_RGB;

image = new BufferedImage(w,h,type);

Graphics2D g2 = image.createGraphics();

g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING,

RenderingHints.VALUE_ANTIALIAS_ON);

g2.setBackground(new Color(220,220,240));

g2.clearRect(0,0,w,h);

g2.setPaint(Color.red);

g2.draw(new CubicCurve2D.Double(0, h, w*4/3.0, h/4.0,

-w/3.0, h/4.0, w, h));

g2.setPaint(Color.green.darker());

g2.draw(new Rectangle2D.Double(w/3.0, h/3.0, w/3.0, h/3.0));

g2.dispose();

}

private JPanel getControls() {

JSlider rotateSlider = new JSlider(-180, 180, 0);

rotateSlider.setMajorTickSpacing(30);

rotateSlider.setMinorTickSpacing(10);

rotateSlider.setPaintTicks(true);

rotateSlider.setPaintLabels(true);

rotateSlider.addChangeListener(new ChangeListener() {

public void stateChanged(ChangeEvent e) {

int value = ((JSlider)e.getSource()).getValue();

theta = Math.toRadians(value);

update();

}

});

rotateSlider.setBorder(BorderFactory.createTitledBorder("theta"));

int min = 50, max = 200, inc = 25;

JSlider zoomSlider = new JSlider(min, max, 100);

zoomSlider.setMajorTickSpacing(inc);

zoomSlider.setMinorTickSpacing(5);

zoomSlider.setPaintTicks(true);

zoomSlider.setLabelTable(getLabelTable(min, max, inc));

zoomSlider.setPaintLabels(true);

zoomSlider.addChangeListener(new ChangeListener() {

public void stateChanged(ChangeEvent e) {

int value = ((JSlider)e.getSource()).getValue();

scale = value/100.0;

update();

}

});

zoomSlider.setBorder(BorderFactory.createTitledBorder("scale"));

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

GridBagConstraints gbc = new GridBagConstraints();

gbc.weightx = 1.0;

gbc.fill = GridBagConstraints.HORIZONTAL;

gbc.gridwidth = GridBagConstraints.REMAINDER;

panel.add(rotateSlider, gbc);

panel.add(zoomSlider, gbc);

return panel;

}

private Hashtable getLabelTable(int min, int max, int inc) {

Hashtable<Integer,JComponent> table = new Hashtable<Integer,JComponent>();

for(int j = min; j <= max; j += inc) {

JLabel label = new JLabel(String.format("%.2f", j/100.0));

table.put(new Integer(j), label);

}

return table;

}

public static void main(String[] args) {

RotationZoom test = new RotationZoom();

JFrame f = new JFrame();

f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

f.getContentPane().add(new JScrollPane(test));

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

f.setSize(500,500);

f.setLocation(200,100);

f.setVisible(true);

}

}

crwooda at 2007-7-12 1:36:27 >