// Program 16.3: Panel Example
import java.applet.Applet;
import java.awt.Graphics;
import java.awt.Canvas;
import java.awt.Label;
import java.awt.Color;
import java.awt.Dimension;
import java.awt.Event;
import java.awt.Font;
import java.awt.BorderLayout;
import java.awt.FlowLayout;
import java.awt.Panel;


public class Panic extends Applet {

  public void init () {
  
    setLayout(new BorderLayout());
    Panel p1 = new Panel();
    p1.setLayout(new FlowLayout());
    p1.add(new Label("Don't Panic", Label.CENTER));
    add("North", p1);
    Panel p2 = new Panel();
    p2.setLayout(new FlowLayout());
    p2.add(new PanicButton());
    add("Center", p2);
    
  }

  public boolean action(Event e, Object arg) {
  
    if (e.target instanceof PanicButton) {
      System.exit(1);
      return true;
    }
    else {
      return false;
    }
  }

}

class PanicButton extends Canvas {

  int radius = 100;

  public void paint(Graphics g) {
  
      g.setFont(new Font("Helvetica", Font.BOLD, 24));
      g.setColor(Color.red);
      g.fillOval(0, 0, 2*radius, 2*radius);
      g.setColor(Color.yellow);
      g.drawString("Panic", 65, radius+12);
      
    }
    
  public boolean mouseUp(Event e, int x, int y) {
    
    // Was the click inside the circle??
    if (Math.sqrt( (x-radius)*(x-radius) + 
      (y-radius)*(y-radius)) <= radius) {
      postEvent(new Event(this, Event.ACTION_EVENT, "Panic"));
      return true;
    }
    else {
      return false;
    }
    
  }
    
  public Dimension minimumSize() {
    return new Dimension(2*radius,2*radius);
  }

  public Dimension preferredSize() {
    return minimumSize();
  }

}