Mega Code Archive
Screen capture with crop operation
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import java.awt.Dimension;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.Image;
import java.awt.Point;
import java.awt.Rectangle;
import java.awt.Robot;
import java.awt.Toolkit;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import java.awt.event.MouseMotionAdapter;
import java.awt.image.BufferedImage;
import java.io.File;
import java.util.Iterator;
import javax.imageio.IIOImage;
import javax.imageio.ImageIO;
import javax.imageio.ImageWriteParam;
import javax.imageio.ImageWriter;
import javax.imageio.stream.ImageOutputStream;
import javax.swing.JFrame;
import javax.swing.JMenu;
import javax.swing.JMenuBar;
import javax.swing.JMenuItem;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
public class ScreenCapture extends JFrame {
ImageArea ia = new ImageArea();
Rectangle rectScreenSize = new Rectangle(Toolkit.getDefaultToolkit().getScreenSize());
static Robot robot;
JScrollPane jsp;
public ScreenCapture(String title) {
super(title);
setDefaultCloseOperation(EXIT_ON_CLOSE);
JMenuBar mb = new JMenuBar();
JMenu menu = new JMenu("File");
ActionListener al;
JMenuItem mi = new JMenuItem("Save");
al = new ActionListener() {
public void actionPerformed(ActionEvent e) {
save();
}
};
mi.addActionListener(al);
menu.add(mi);
mb.add(menu);
menu = new JMenu("Capture");
mi = new JMenuItem("Capture");
al = new ActionListener() {
public void actionPerformed(ActionEvent e) {
setVisible(false);
BufferedImage biScreen = robot.createScreenCapture(rectScreenSize);
setVisible(true);
ia.setImage(biScreen);
jsp.getHorizontalScrollBar().setValue(0);
jsp.getVerticalScrollBar().setValue(0);
}
};
mi.addActionListener(al);
menu.add(mi);
mb.add(menu);
mi = new JMenuItem("Crop");
al = new ActionListener() {
public void actionPerformed(ActionEvent e) {
if (ia.crop()) {
jsp.getHorizontalScrollBar().setValue(0);
jsp.getVerticalScrollBar().setValue(0);
}
}
};
mi.addActionListener(al);
menu.add(mi);
mb.add(menu);
setJMenuBar(mb);
getContentPane().add(jsp = new JScrollPane(ia));
setVisible(true);
}
private void save() {
if (ia.getImage() == null) {
System.out.println("No captured image.");
return;
}
ImageWriter writer = null;
ImageOutputStream ios = null;
try {
Iterator iter = ImageIO.getImageWritersByFormatName("jpeg");
if (!iter.hasNext()) {
System.out.println("Unable to save image to jpeg file type.");
return;
}
writer = (ImageWriter) iter.next();
ios = ImageIO.createImageOutputStream(new File("c:\\a.jpg"));
writer.setOutput(ios);
ImageWriteParam iwp = writer.getDefaultWriteParam();
iwp.setCompressionMode(ImageWriteParam.MODE_EXPLICIT);
iwp.setCompressionQuality(0.95f);
writer.write(null,
new IIOImage((BufferedImage) ia.getImage(), null, null), iwp);
} catch (Exception e2) {
e2.printStackTrace();
}
}
public static void main(String[] args) throws Exception {
robot = new Robot();
new ScreenCapture("Capture");
}
}
class ImageArea extends JPanel {
private Image image;
Point startPoint = new Point(), endPoint = new Point();
private Rectangle selectedRectangle = new Rectangle();
public ImageArea() {
addMouseListener(new MouseAdapter() {
public void mousePressed(MouseEvent e) {
if (image == null)
return;
startPoint = endPoint = e.getPoint();
repaint();
}
});
addMouseMotionListener(new MouseMotionAdapter() {
public void mouseDragged(MouseEvent e) {
if (image == null)
return;
endPoint = e.getPoint();
repaint();
}
});
}
public boolean crop() {
if (startPoint.equals(endPoint))
return true;
boolean succeeded = true;
int x1 = (startPoint.x < endPoint.x) ? startPoint.x : endPoint.x;
int y1 = (startPoint.y < endPoint.y) ? startPoint.y : endPoint.y;
int x2 = (startPoint.x > endPoint.x) ? startPoint.x : endPoint.x;
int y2 = (startPoint.y > endPoint.y) ? startPoint.y : endPoint.y;
int width = (x2 - x1) + 1;
int height = (y2 - y1) + 1;
BufferedImage biCrop = new BufferedImage(width, height,
BufferedImage.TYPE_INT_RGB);
Graphics2D g2d = biCrop.createGraphics();
BufferedImage bi = (BufferedImage) image;
BufferedImage bi2 = bi.getSubimage(x1, y1, width, height);
g2d.drawImage(bi2, null, 0, 0);
g2d.dispose();
if (succeeded)
setImage(biCrop);
else {
startPoint.x = endPoint.x;
startPoint.y = endPoint.y;
repaint();
}
return succeeded;
}
public Image getImage() {
return image;
}
public void paintComponent(Graphics g) {
super.paintComponent(g);
if (image != null)
g.drawImage(image, 0, 0, this);
if (startPoint.x != endPoint.x || startPoint.y != endPoint.y) {
int x1 = (startPoint.x < endPoint.x) ? startPoint.x : endPoint.x;
int y1 = (startPoint.y < endPoint.y) ? startPoint.y : endPoint.y;
int x2 = (startPoint.x > endPoint.x) ? startPoint.x : endPoint.x;
int y2 = (startPoint.y > endPoint.y) ? startPoint.y : endPoint.y;
selectedRectangle.x = x1;
selectedRectangle.y = y1;
selectedRectangle.width = (x2 - x1) + 1;
selectedRectangle.height = (y2 - y1) + 1;
Graphics2D g2d = (Graphics2D) g;
g2d.draw(selectedRectangle);
}
}
public void setImage(Image image) {
this.image = image;
setPreferredSize(new Dimension(image.getWidth(this), image.getHeight(this)));
revalidate();
startPoint.x = endPoint.x;
startPoint.y = endPoint.y;
repaint();
}
}
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