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Java: Example - Drawing a Face

This simple application creates a graphic component to display a face. It uses a JPanel and overrides the paintComponent method to do the drawing.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

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// Face.java - shows how to create a graphics component.
// Fred Swartz 1996 ... 2002-10-24

import java.awt.*;
import javax.swing.*;

////////////////////////////////////////////////////////////////// Face
public class Face {
    // =========================================================== main
    public static void main(String[] args) {
        JFrame windo = new FaceWindow();
        windo.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        windo.setVisible(true);
    }//end main
}//end class Face

//////////////////////////////////////////////////////////// FaceWindow
class FaceWindow extends JFrame {
    // ==================================================== constructor
    FaceWindow() {
        Container content = this.getContentPane();  // get content pane
        content.setLayout(new BorderLayout());      // set its layout
        PacLady drawing = new PacLady();            // Create a PacLady
        content.add(drawing, BorderLayout.CENTER);  // center expands
        
        this.setTitle("Ms Paclady");
        this.pack();             // finalize window layout
    }//end constructor
}//endclass FaceWindow  
    
/////////////////////////////////////////////////////// class PacLady
    // This class extends JPanel and overrides paintComponent to
    // create a component for drawing - in this case a face.
class PacLady extends JPanel {
    // ================================================== constructor
    PacLady() {
        this.setBackground(Color.lightGray);
        this.setPreferredSize(new Dimension(400, 400));  // size
    }//end constructor
    
    //================================================ paintComponent
    public void paintComponent(Graphics g) {
        // This method is called to redraw window
        super.paintComponent(g);  // MUST be first line      
        //--- Draw the head with open mouth and 8 pixel border
        g.setColor(Color.pink);
        g.fillArc(8, 8, 384, 384, 30, 300);       
        //--- Draw the eye
        g.setColor(Color.magenta);
        g.fillOval(230, 72, 60, 60);
    }//end paintComponent
}//endclass PacLady

Possible exensions

  1. When the window is resized, the PacLady JPanel will also be resized. The drawing should be changed. Use
        int w = this.getWidth();
        int h = this.getHeight();
    near the beginning of paintComponent to find the width and height of the panel. Use these values so that the face expands and contracts more appropriately.
  2. Add a button that changes the expression when it is clicked. For example, it could change the face from happy to sad and vice versa.
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