Find out number of components between 2 points

Question

Hello al,
I want to get all the components between 2 points in a container.Is rthere any way or method w hich will help me out ???

Answer 1

import java.awt.*;
import java.awt.event.*;
import java.awt.geom.*;
import javax.swing.*;
public class FindingComponents
    public FindingComponents()
        LinePanel linePanel = new LinePanel();
        JPanel buttonPanel = getButtonPanel();
        JLabel label = getLabel();
        PointLocator pointer = new PointLocator(linePanel, buttonPanel, label);
        linePanel.addMouseListener(pointer);
        JPanel panel = new JPanel();
        OverlayLayout overlay = new OverlayLayout(panel);
        panel.setLayout(overlay);
        panel.add(linePanel);        // upper panel
        panel.add(buttonPanel);      // lower panel
        JFrame f = new JFrame();
        f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        f.getContentPane().add(panel);
        f.getContentPane().add(label, "South");
        f.setSize(400,400);
        f.setLocation(200,200);
        f.setVisible(true);
    private JPanel getButtonPanel()
        JPanel panel = new JPanel(new GridBagLayout());
        GridBagConstraints gbc = new GridBagConstraints();
        gbc.weighty = 1.0;
        gbc.weightx = 1.0;
        for(int j = 0; j < 16; j++)
            String id = "button " + (j + 1);
            JButton button = new JButton(id);
            button.setActionCommand(id);
            if((j + 1) % 4 == 0)
                gbc.gridwidth = gbc.REMAINDER;
            panel.add(button, gbc);
            if((j + 1) % 4 == 0)
                gbc.gridwidth = 1;
        return panel;
    private JLabel getLabel()
        JLabel label = new JLabel("none", JLabel.CENTER);
        label.setBorder(BorderFactory.createTitledBorder("components intersecting line"));
        Dimension d = label.getPreferredSize();
        d.height = 45;
        label.setPreferredSize(d);
        return label;
    public static void main(String[] args)
        new FindingComponents();
class LinePanel extends JPanel
    Line2D line;
    public LinePanel()
        line = new Line2D.Double();
        setOpaque(false);
    protected void paintComponent(Graphics g)
        super.paintComponent(g);
        Graphics2D g2 = (Graphics2D)g;
        g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING,
                            RenderingHints.VALUE_ANTIALIAS_ON);
        g2.setPaint(Color.red);
        g2.draw(line);
    public void setLine(Point start, Point end)
        line.setLine(end, start);
        repaint();
class PointLocator extends MouseAdapter
    LinePanel linePanel;
    JPanel buttonPanel;
    JLabel label;
    Point start;
    boolean startSet;
    public PointLocator(LinePanel lp, JPanel bp, JLabel label)
        linePanel = lp;
        buttonPanel = bp;
        this.label = label;
        start = new Point();
        startSet = false;
    public void mousePressed(MouseEvent e)
        Point p = e.getPoint();
        if(!startSet)
            start = p;
            linePanel.setLine(start, p);
            startSet = true;
        else
            linePanel.setLine(start, p);
            start = p;
            startSet = false;
    public void mouseReleased(MouseEvent e)
        if(!startSet)
            Component[] c = buttonPanel.getComponents();
            Rectangle rv = new Rectangle();
            String s = "";
            for(int j = 0; j < c.length; j++)
                c[j].getBounds(rv);
                if(linePanel.line.intersects(rv))
                    s += ((JButton)c[j]).getActionCommand() + ", ";
            if(s.indexOf(",") != -1)
                s = s.substring(0, s.lastIndexOf(","));
            else
                s = "none";
            label.setText(s);
            label.repaint();
}