Is it possible to change the cursor with onMouseOver...

[Ananth Chellathurai]

Here is my problem. I have a panel which has some lines drawn over it. I need to change the cursor to hand cursor when I move over the lines. I am able to set the cursor as handcursor for the total panel, but it should be changed when I move the mouse over the lines? Is there an event for mouse over? Please help me on this.

Ananth

[pete stein]

Line2D is a Shape and thus has certain properties that are quite useful. One of these is the intersect method, that can be used to see if the mouse intersects a line. You may have to translate the cursor point into a small square for this to work, but it does work.

import java.awt.BasicStroke;
import java.awt.Color;
import java.awt.Cursor;
import java.awt.Dimension;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.Point;
import java.awt.Stroke;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import java.awt.geom.Line2D;
import java.awt.geom.Rectangle2D;
 
import javax.swing.JFrame;
import javax.swing.JPanel;
 
public class CursorOverHands extends JPanel
{
    private Line2D.Double line = new Line2D.Double(40, 40, 360, 360);
 
    public CursorOverHands()
    {
        setPreferredSize(new Dimension(400, 400));
        addMouseMotionListener(new MouseAdapter()
        {
 
            @Override
            public void mouseMoved(MouseEvent e)
            {
                Point p = e.getPoint();
                Rectangle2D.Double rect = new Rectangle2D.Double(p.x - 1,
                        p.y - 1, 3, 3);
                if (line.intersects(rect))
                {
                    setCursor(new Cursor(Cursor.HAND_CURSOR));
                }
                else
                {
                    setCursor(new Cursor(Cursor.DEFAULT_CURSOR));
                }
            }
        });
    }
 
    @Override
    protected void paintComponent(Graphics g)
    {
        super.paintComponent(g);
        Graphics2D g2 = (Graphics2D) g;
        Stroke oldStroke = g2.getStroke();
        Stroke stroke = new BasicStroke(4);
        g2.setStroke(stroke);
        g2.setColor(Color.blue);
        g2.draw(line);
        g2.setStroke(oldStroke);
    }
 
    private static void createAndShowUI()
    {
        JFrame frame = new JFrame("CursorOverHands");
        frame.getContentPane().add(new CursorOverHands());
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.pack();
        frame.setLocationRelativeTo(null);
        frame.setVisible(true);
    }
 
    public static void main(String[] args)
    {
        java.awt.EventQueue.invokeLater(new Runnable()
        {
            public void run()
            {
                createAndShowUI();
            }
        });
    }
}

[Ananth Chellathurai]

Thanks for your reply. I have got what I want like this,

getPsdGPanel().addMouseMotionListener(new java.awt.event.MouseMotionAdapter()
{
public void mouseMoved(MouseEvent e)
{
psdGPanelMouseMoved(e);
}
});

psdGPanelMouseMoved finds whether there is a line at that e.x and e.y and changes the cursor. Thanks again for your interest shown.

Ananth