Image Crop

[Mathias Nilsson]

Hi!

I want to crop an image within a java applet. I've succeded in doing this but I want an effect when selecting the crop area.

I want the area that is marked to be like the image but the area around to be darkened or grayed out. How can I do this. Here is a link so you know what I meen.

Crop image

[Craig Wood]

//  <applet code="ImageCrop" width="400" height="400"></applet>
import java.awt.*;
import java.awt.event.*;
import java.awt.geom.Area;
import java.awt.image.BufferedImage;
import java.io.*;
import javax.imageio.ImageIO;
import javax.imageio.stream.ImageInputStream;
import javax.swing.*;
 
public class ImageCrop extends JApplet
{
    public void init()
    {
        ImageCropPanel imageCropPanel = new ImageCropPanel();
        getContentPane().setLayout(new BorderLayout());
        getContentPane().add(new JScrollPane(imageCropPanel));
    }
 
    public static void main(String[] args)
    {
        JApplet applet = new ImageCrop();
        JFrame f = new JFrame("click to mask");
        f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        f.getContentPane().add(applet);
        f.setSize(400,400);
        f.setLocation(200,200);
        applet.init();
        f.setVisible(true);
    }
}
 
class ImageCropPanel extends JPanel
{
    BufferedImage image;
    Dimension size;
    Rectangle clip;
    boolean maskImage;
 
    public ImageCropPanel()
    {
        image = getImage();
        size = new Dimension(image.getWidth(), image.getHeight());
        maskImage = false;
        addMouseListener(toggler);
        addComponentListener(resizer);
    }
 
    protected void paintComponent(Graphics g)
    {
        super.paintComponent(g);
        Graphics2D g2 = (Graphics2D)g;
        g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING,
                            RenderingHints.VALUE_ANTIALIAS_ON);
        int w = getWidth();
        int h = getHeight();
        if(clip == null)
        {
            clip = new Rectangle(size.width/2, size.height/2);
            clip.setLocation((w - clip.width)/2, (h - clip.height)/2);
        }
        int x = (w - size.width)/2;
        int y = (h - size.height)/2;
        g2.drawImage(image, x, y, this);
        if(maskImage)
        {
            Area mask = new Area(new Rectangle(0,0,w,h));
            mask.subtract(new Area(clip));
            g2.setPaint(Color.gray);
            g2.fill(mask);
        }
        g2.setPaint(Color.red);
        g2.draw(clip);
    }
 
    public Dimension getPreferredSize()
    {
        return size;
    }
 
    private MouseListener toggler = new MouseAdapter()
    {
        public void mousePressed(MouseEvent e)
        {
            maskImage = !maskImage;
            repaint();
        }
    };
 
    private ComponentListener resizer = new ComponentAdapter()
    {
        public void componentResized(ComponentEvent e)
        {
            clip = null;
            repaint();
        }
    };
 
    private BufferedImage getImage()
    {
        String path = "images/owls.jpg";
        BufferedImage bi = null;
        try
        {
            InputStream is = getClass().getResourceAsStream(path);
            ImageInputStream iis = ImageIO.createImageInputStream(is);
            bi = ImageIO.read(iis);
        }
        catch(IOException ioe)
        {
            System.err.printf("read error for %s path %s%n",
                               path, ioe.getMessage());
        }
        return bi;
    }
}

[Iman Abdulah]

[Thread hi-jack removed]
[ May 20, 2006: Message edited by: Bear Bibeault ]

[Bear Bibeault]

Iman, please do not cross-post the same question in more than one forum.

And. please do not hi-jack someone else's post with your own question. It's considered very rude.