import java.awt.*;
import java.awt.event.*;

/*
 ***************************************************************
 * Silly Sample program which demonstrates the basic paint
 * callback mechanism in the AWT.
 ***************************************************************
 */
public class PaintDemo {
    public static void main(String[] args) {
        Frame f = new Frame("Have a nice day!");
        f.addWindowListener(new WindowAdapter() {
            public void windowClosing(WindowEvent e) {
                System.exit(0);
            }
        });
        f.add(new SmileyCanvas(Color.yellow), BorderLayout.CENTER);
        f.pack();
        f.show();
    }
}

/**
 * A canvas which renders a smiley-face to the screen
 *
 * Note: Canvas is a heavyweight superclass, which makes
 * SmileyCanvas also heavyweight.  To convert this class to
 * a lightweight, change "extends Canvas" to "extends Component".
 */
class SmileyCanvas extends Canvas {

    public SmileyCanvas(Color faceColor) {
        setForeground(faceColor);
    }

    public Dimension getPreferredSize() {
        return new Dimension(300,300);
    }

   /*
    * Paint when the AWT tells us to...
    */
    public void paint(Graphics g) {
        // Dynamically calculate size information
        // (the canvas may have been resized externally...)
        Dimension size = getSize();
        int d = Math.min(size.width, size.height); // diameter
        int ed = d/20; // eye diameter
        int x = (size.width - d)/2;
        int y = (size.height - d)/2;

        // draw head (color already set to foreground)
        g.fillOval(x, y, d, d);
        g.setColor(Color.black);
        g.drawOval(x, y, d, d);

        // draw eyes
        g.fillOval(x+d/3-(ed/2), y+d/3-(ed/2), ed, ed);
        g.fillOval(x+(2*(d/3))-(ed/2), y+d/3-(ed/2), ed, ed);

        //draw mouth
        g.drawArc(x+d/4, y+2*(d/5), d/2, d/3, 0, -180);
    }
}