package com.tutego.insel.solutions.ui.awt;

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

public class FCircle extends Frame
{
  private static final long serialVersionUID = -610705626036618898L;

  public FCircle()
  {
    super( "Grafik mit Ulli" );
    setSize( 400, 300 );
    setVisible( true );
    
    addWindowListener(new WindowAdapter() {
          public void windowClosing( WindowEvent e ) {
            System.exit(0); } } );
  }
  
  static void drawPoint( Graphics g, int x, int y )
  {
    g.drawLine( x, y, x, y );
  }
  
  static void fcircle( Graphics g, int x, int y, int radius )
  {
    int balance, xoff, yoff;
    
    xoff = 0;
    yoff = radius;
    balance = -radius;
    
    do
    {
      drawPoint(g, x+xoff, y+yoff);
      drawPoint(g, x-xoff, y+yoff);
      drawPoint(g, x-xoff, y-yoff);
      drawPoint(g, x+xoff, y-yoff);
      drawPoint(g, x+yoff, y+xoff);
      drawPoint(g, x-yoff, y+xoff);
      drawPoint(g, x-yoff, y-xoff);
      drawPoint(g, x+yoff, y-xoff);
      
      if (( balance += xoff++ + xoff) >= 0 )
        balance -= --yoff + yoff;
      
    } while ( xoff <= yoff );
  }
  
  public void paint( Graphics g )
  {
    fcircle( g, 100, 100, 50 );
  }
  
  public static void main( String args[] )
  {
    new FCircle();
  }
}