Core Java - [Java Font/FontMatrices Classes]

♠ Posted by Unknown in Core Java at 11:01

Java Font/FontMatrices Classes

You can set the font for the subjects you draw and use font matrics to obtain font size. Fonts and Font Matrices are encapsulated in two AWT classes: Font and FontMatrics.

To set a font, you need to create a Font object from the class Font class.

            Font myfont = new Font(name, style, size);

 Font myFont = new Font("TimesRoman", Font.BOLD, 16);

 Font myFont = new Font("TimesRoman", Font.BOLD + Font.ITALIC, 16);

YOu can use FontMatrices to computer the exact length and width of a string, which is helpful for measuring string size in order to display it in the right position.

Leading - This is the space amount between lines.

Ascent - This is the height of a character.

Descent - This is the distance from the baseline to the bottom of a descending character.

Height - This is the sum of leading, ascent, and descent.

Example:

import java.awt.*;

import java.awt.event.*;

public class FontExample extends Frame implements WindowListener

{

            public FontExample()

            {

                        addWindowListener(this);

            }

           

            public void paint(Graphics g)

            {

                        String message = "Welcome to Java";

                       

                        Font f = new Font("TimesRoman",Font.BOLD,16);

                        g.setFont(f);

                       

                        FontMetrics fm = g.getFontMetrics(f);

                       

                        int w = fm.stringWidth(message);

                        int h = fm.getAscent();

                        int x = (getSize().width - w)/2;

                        int y = (getSize().height - h)/2;

                        g.drawString(message, x, y);

            }

           

            public void windowClosed(WindowEvent e)

            {}

            public void windowDeiconified(WindowEvent e)

            {}

            public void windowIconified(WindowEvent e)

            {}

            public void windowActivated(WindowEvent e)

            {}

            public void windowDeactivated(WindowEvent e)

            {}

            public void windowOpened(WindowEvent e)

            {}

            public void windowClosing(WindowEvent e)

            {

                        dispose();

                        System.exit(0);

            }

            public static void main(String[] args)

            {

                        FontExample f = new FontExample();

                        f.setSize(300, 300);

                        f.setVisible(true);       

            }

}