How to zoom into a specific part of an image?
I am trying to mess around with2DGraphics and affinetramsform to zoom into a section of an image but i have no luck doing it. Can someone help me out? Lets say I want to zoom into the coordinates (200,300) and (400,600) . I know DrawImage has a method that does this but does 2DGraphics have it too or affinetransform? I havent see anything like it yet. thanks
you could check this
http://www.javareference.com/jrexamples/viewexample.jsp?id=84
it may help you
Similar Messages
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How to have 2DGraphics zoom into a specific part of an image?
I am trying to mess around with2DGraphics and affinetramsform to zoom into a section of an image but i have no luck doing it. Can someone help me out? Lets say I want to zoom into the coordinates (200,300) and (400,600) . I know DrawImage has a method that does this but does 2DGraphics have it too or affinetransform? I havent see anything like it yet. thanks
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 ZoomIt extends JPanel {
BufferedImage image;
Dimension size;
Rectangle clip;
AffineTransform at = new AffineTransform();
public ZoomIt(BufferedImage image) {
this.image = image;
size = new Dimension(image.getWidth(), image.getHeight());
clip = new Rectangle(100,100,200,200);
protected void paintComponent(Graphics g) {
super.paintComponent(g);
Graphics2D g2 = (Graphics2D)g;
g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING,
RenderingHints.VALUE_ANTIALIAS_ON);
g2.drawRenderedImage(image, at);
g2.setColor(Color.red);
g2.draw(clip);
//g2.setPaint(Color.blue);
//g2.draw(at.createTransformedShape(clip));
public Dimension getPreferredSize() {
return size;
private void zoomToClip() {
// Viewport size.
Dimension viewSize = ((JViewport)getParent()).getExtentSize();
// Component dimensions.
int w = getWidth();
int h = getHeight();
// Scale the clip to fit the viewport.
double xScale = (double)viewSize.width/clip.width;
double yScale = (double)viewSize.height/clip.height;
double scale = Math.min(xScale, yScale);
at.setToScale(scale, scale);
size.width = (int)(scale*size.width);
size.height = (int)(scale*size.height);
revalidate();
private void reset() {
at.setToIdentity();
size.setSize(image.getWidth(), image.getHeight());
revalidate();
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(getZoomControls(), gbc);
panel.add(getClipControls(), gbc);
return panel;
private JPanel getZoomControls() {
final JButton zoom = new JButton("zoom");
final JButton reset = new JButton("reset");
ActionListener al = new ActionListener() {
public void actionPerformed(ActionEvent e) {
JButton button = (JButton)e.getSource();
if(button == zoom)
zoomToClip();
if(button == reset)
reset();
repaint();
zoom.addActionListener(al);
reset.addActionListener(al);
JPanel panel = new JPanel();
panel.add(zoom);
panel.add(reset);
return panel;
private JPanel getClipControls() {
int w = size.width;
int h = size.height;
SpinnerNumberModel xModel = new SpinnerNumberModel(100, 0, w/2, 1);
final JSpinner xSpinner = new JSpinner(xModel);
SpinnerNumberModel yModel = new SpinnerNumberModel(100, 0, h/2, 1);
final JSpinner ySpinner = new JSpinner(yModel);
SpinnerNumberModel wModel = new SpinnerNumberModel(200, 0, w, 1);
final JSpinner wSpinner = new JSpinner(wModel);
SpinnerNumberModel hModel = new SpinnerNumberModel(200, 0, h, 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("width"), wSpinner, panel, gbc, cl);
addComponents(new JLabel("height"), hSpinner, panel, gbc, cl);
return panel;
private void addComponents(Component c1, JSpinner s, Container c,
GridBagConstraints gbc, ChangeListener cl) {
gbc.anchor = GridBagConstraints.EAST;
c.add(c1, gbc);
gbc.anchor = GridBagConstraints.WEST;
c.add(s, gbc);
s.addChangeListener(cl);
public static void main(String[] args) throws IOException {
String path = "images/owls.jpg";
BufferedImage image = ImageIO.read(new File(path));
ZoomIt test = new ZoomIt(image);
JFrame f = new JFrame();
f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
f.getContentPane().add(new JScrollPane(test));
f.getContentPane().add(test.getControlPanel(), "Last");
f.pack();
f.setLocationRelativeTo(null);
f.setVisible(true);
} -
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<table class="table table-bordered table-striped">
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English Version below.
Hallo zusammen. Ich bin von Apple Aperture auf PSE 12 gewechselt. Nun habe ich meine 11500 Fotos im Organizer und ein paar Startschwierigkeiten.
Ich habe in den Voreinstellungen angegeben, dass man Fotos auf über 100% skalieren darf. Das funktioniert aber nicht. Fotos werden immer nur im Fenster eingepasst, wenn der Zoomhebel ganz nach rechts steht.
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ie vergleiche ich mehrere Bilder? Im Handbuch steht beschrieben, dass man dazu aus dem Menü Ansicht -> Bilder Vergleichen wählen soll. Diesen Menüpunkt gibt es bei mir nicht.
Auch bei dem Druck auf F12 geschieht bei mir nichts. Kann ich die Tastenfunktionen irgendwo neu zuweisen?
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English Version
Hi there. I switched from Apple Aperture to PSE 12. Now I have my 11500 photos in the Organizer and a few teething problems.
I have specified in the preferences that you can resize photos to over 100%. This does not work. Photos are always fitted only in the window when the zoom lever is all the way to the right.
Only in the full-screen view you can scale over 100%. However, this also works if I have not set the setting in the preferences.
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There is no preference to "resize photos to over 100%".
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To do either of these options (from the Organizer) you have to be in the Full Screen mode. From here, you can use the mouse wheel (or trackpad) to zoom up to 1600%. You can also compare images by selecting the Side-by-Side or Top/Bottom display from the "View" Options button on the Full Screen options bar.
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