What are the differences between a Font and a FontMetrics in Java?

AWTJavaObject Oriented ProgrammingProgrammingSwing

A Font class is used to set the screen fonts and it maps the characters of the language to their respective glyphs whereas a FontMetrics class defines a font metrics object, which encapsulates information about the rendering of a particular font on a particular screen.

Font

A Font class can be used to create an instance of a Font object to set the font for drawing text, label, text fields, buttons, etc and it can be specified by its name, style, and size.

The fonts have a family name, a logical name and a face-name

  • family name: It is the general name of the font, such as Courier.
  • logical name: It specifies a category of font, such as Monospaced.
  • face name: It specifies a specific font, such as Courier Italic.

Example

import java.awt.*;
import javax.swing.*;
public class FontTest extends JPanel {
   public void paint(Graphics g) {
      g.setFont(new Font("TimesRoman", Font.BOLD, 15));
      g.setColor(Color.blue);
      g.drawString("Welcome to Tutorials Point", 10, 20);
   }
   public static void main(String args[]) {
      JFrame test = new JFrame();
      test.getContentPane().add(new FontTest());
      test.setTitle("Font Test");
      test.setSize(350, 275);
      test.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
      test.setLocationRelativeTo(null);
      test.setVisible(true);
   }
}

Output

FontMetrics

The FontMetrics class is used to return the specific parameters for a particular Font object. An object of FontMetrics class is created using the getFontMetrics() method. The methods of FontMetrics class can provide access to the details of the implementation of a Font object. The methods bytesWidth(), charWidth(), charsWidth(), getWidth(), and stringWidth() are used to determine the width of a text object in pixels. These methods are essential for determining the horizontal position of text on the screen.

Example

import java.awt.*;
import javax.swing.*;
public class FontMetricsTest extends JPanel {
   public void paint(Graphics g) {
      String msg = "Tutorials Point";
      Font f = new Font("Times New Roman",Font.BOLD|Font.ITALIC, 15);
      FontMetrics fm = getFontMetrics(f);
      g.setFont(f);
      int x =(getSize().width-fm.stringWidth(msg))/2;
      System.out.println("x= "+x);
      int y = getSize().height/2;
      System.out.println("y= "+y);
      g.drawString(msg, x, y);
   }
   public static void main(String args[]){
      JFrame test = new JFrame();
      test.getContentPane().add(new FontMetricsTest());
      test.setTitle("FontMetrics Test");
      test.setSize(350, 275);
      test.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
      test.setLocationRelativeTo(null);
      test.setVisible(true);
   }
}

Output

raja
Published on 16-Jul-2019 18:24:17
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