Re: how to use ToolTip' functions on a Graphics area?

"John B. Matthews" <nospam@nospam.invalid>
Mon, 08 Jun 2009 16:07:35 -0400
In article
 Vinicius Pereira <> wrote:

On 8 jun, 14:16, "John B. Matthews" <nos...@nospam.invalid> wrote:

In article
?Vinicius Pereira <> wrote:


Thanks John B. Matthews

Yes, that was what I think, but I was looking for a way to use these
ToolTip's functions of these packages. I think that if use these
functions, my program will be more resourceful. But I can make it

My principal goal, is that my ToolTip look like this on of this site:

In the applet on this site, press the button of "refresh" in the
right- superior corner. The applet will show a colour figure of
Pascal's Triangle. Then put the mouse's cursor on the triangle and
then appear a "tip" on the side of the cursor. In the tip, appear the
coefficient number of the cell of the triangle which the cursor is.

As Knute Johnson's example in this thread shows, JComponents have that
functionality already. Your example appears to be a JButton, which is
also a JComponent. Here's an example of a custom "tip" that follows the

package gui;

import java.awt.*;
import java.awt.event.MouseEvent;
import java.awt.event.MouseMotionAdapter;
import java.awt.font.FontRenderContext;
import java.awt.font.TextLayout;
import java.awt.geom.Rectangle2D;
import javax.swing.JFrame;
import javax.swing.JPanel;

public class TipTest extends JPanel {

    private static Color hiliteColor = new Color(0xFFFFC0);
    private static Font font = new Font("SansSerif", Font.PLAIN, 12);
    private FontRenderContext frc =
        new FontRenderContext(null, false, false);
    private Point pt = new Point(Short.MAX_VALUE, Short.MAX_VALUE);

    public TipTest() {
        setPreferredSize(new Dimension(320, 240));
        this.addMouseMotionListener(new MouseMotionAdapter() {
            public void mouseMoved(MouseEvent e) {
                pt.setLocation(e.getX(), e.getY());

    public void paintComponent(Graphics g) {
        Graphics2D g2D = (Graphics2D) g;

        g.fillRect(0, 0, getWidth(), getHeight());
        String s = pt.x + "," + pt.y;
        Rectangle2D.Float r = (Rectangle2D.Float)
            font.getStringBounds(s, frc);
        r.setRect(r.x + pt.x - 3d, r.y + pt.y - 2d,
            r.width + 6d, r.height + 4d);
        TextLayout layout = new TextLayout(s, font, frc);
        layout.draw(g2D, (float) pt.x, (float) pt.y);

    public static void main(String[] args) {
        EventQueue.invokeLater(new Runnable() {

            public void run() {
                JFrame f = new JFrame();
                f.add(new TipTest(), BorderLayout.CENTER);
John B. Matthews
trashgod at gmail dot com

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