Bounding box for text

Question

Howdy, I am looking for a way to get the bounding box of some text. I can do it with a graphics2d object, but there are some times when I want to get the bounding box without having access to a graphics objects. I have looked at several classes in the API and it seems that they either take a graphics object or one of their parameters takes a graphics object (Parameter A uses a graphics object of method A, for example). Is there a way to do it without one?
Thanks.
Message was edited by:
dayrinni

Answer 1

See the caution in paragraph four of the FontRenderContext comments.
import java.awt.*;
import java.awt.event.*;
import java.awt.font.*;
import java.awt.geom.Rectangle2D;
import javax.swing.*;
public class NoGraphics {
    public static void main(String[] args) {
        String s = "Hello World";
        FontRenderContext frc = new FontRenderContext(null, false, false);
        Font font = new Font("dialog", Font.PLAIN, 36);
        GlyphVector gv = font.createGlyphVector(frc, s);
        Rectangle2D r1 = font.getStringBounds(s, frc);
        Rectangle2D r2 = new TextLayout(s, font, frc).getBounds();
        Rectangle2D r3 = gv.getLogicalBounds();
        Rectangle2D r4 = gv.getPixelBounds(frc, 0, 0);
        Rectangle2D r5 = gv.getVisualBounds();
        System.out.printf("%s%n%s%n%s%n%s%n%s%n", toString(r1, "string"),
                           toString(r2, "text"),  toString(r3, "logical"),
                           toString(r4, "pixel"), toString(r5, "visual"));
        final JLabel position = new JLabel("x = 0  y = 0", JLabel.CENTER);
        JLabel label = new JLabel(s, JLabel.CENTER);
        label.setFont(font);
        label.setText(s);
        label.setOpaque(true);
        label.setBackground(Color.pink);
        label.addMouseMotionListener(new MouseMotionAdapter() {
            public void mouseMoved(MouseEvent e) {
                position.setText("x = " + e.getX() + "  y = " + e.getY());
        JPanel panel = new JPanel(new GridBagLayout());
        GridBagConstraints gbc = new GridBagConstraints();
        gbc.insets = new Insets(2,2,2,2);
        gbc.gridwidth = gbc.REMAINDER;
        panel.add(label, gbc);
        panel.add(position, gbc);
        JOptionPane.showMessageDialog(null, panel, "Compare",
                                      JOptionPane.PLAIN_MESSAGE);
    private static String toString(Rectangle2D r, String id) {
        return String.format("%8s [%.1f, %.1f]",
                              id, r.getWidth(), r.getHeight());
}