//Circle2Applet.java
//draw a circle centered in the middle of the applet area

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

public class Circle2Applet extends JApplet {

    int radius;     //int to avoid casting...
    double circumference, area;
    
    public void init() {
	String input;
	
	input = JOptionPane.showInputDialog( "Enter radius" );
    	radius = Integer.parseInt( input );
	
	//Math.PI is a double value equal about 3.141592
	circumference = 2 * Math.PI * radius;
	area = Math.PI * radius * radius;
	
	JOptionPane.showMessageDialog(null, "Area=" + area + "\n" +
				      "circumference=" + circumference );
    }
    
    
    public void paint (Graphics g) {
	
	int x;
	x = getWidth()/2 - radius;   //middle width - radius
	
	int y;
	y = getHeight()/2 - radius;  //middle height - radius
	
	//draw circle in middle of applet area	  
	g.setColor( Color.BLUE );
	g.fillOval( x, y, 2*radius, 2*radius );
	
	g.setColor( Color.RED );
	g.drawString( "Area="+area+"  Circumference="+circumference, 1, 15 );
    }
} 
//fill applet area
//half, quarter etc sizes