//  RectangleAWTApplet.java  (c) 2005 Kari Laitinen

//  2005-06-07  File created.
//  2006-10-03  Last modification.

//  This program is a traditional, non-swing, Java applet that
//  works in the same way as RectangleApplet.java

//  This program shows how objects of classes Scrollbar, Checkbox, and
//  CheckboxGroup can be used in an applet.

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

public class RectangleAWTApplet extends    java.applet.Applet
                                implements AdjustmentListener,
                                           ItemListener
{
   int  applet_width, applet_height ;

   int  rectangle_width, rectangle_height ;

   int  rectangle_center_position_x, rectangle_center_position_y ;

   Scrollbar  width_scrollbar, height_scrollbar ;

   Color  rectangle_color   =  Color.cyan ;

   Checkbox  cyan_checkbox, magenta_checkbox, green_checkbox,
             lightGray_checkbox ;

   CheckboxGroup  color_selection_checkboxes  =  new  CheckboxGroup() ;

   public void init()
   {
      setLayout( new BorderLayout() ) ;

      applet_width   =  getSize().width ;
      applet_height  =  getSize().height ;

      rectangle_center_position_x  =  applet_width / 2   ;
      rectangle_center_position_y  =  applet_height / 2  ;

      rectangle_width   =  applet_width  /  4 ;
      rectangle_height  =  applet_height  / 4 ;

      height_scrollbar  =  new  Scrollbar( Scrollbar.VERTICAL,
                                            rectangle_height,
                                            0,
                                            0,
                                            applet_height ) ;

      height_scrollbar.addAdjustmentListener( this ) ;

      add( "East", height_scrollbar ) ;

      width_scrollbar   =  new  Scrollbar( Scrollbar.HORIZONTAL,
                                            rectangle_width,
                                            0,
                                            0,
                                            applet_width ) ;

      width_scrollbar.addAdjustmentListener( this ) ;

      Panel  panel_for_checkboxes_and_scrollbar  =  new  Panel() ;

      panel_for_checkboxes_and_scrollbar.add( width_scrollbar ) ;

      cyan_checkbox       =  new Checkbox( "cyan",
                                          true,  color_selection_checkboxes ) ;
      magenta_checkbox    =  new Checkbox( "magenta",
                                          false, color_selection_checkboxes ) ;
      green_checkbox      =  new Checkbox( "green",
                                          false, color_selection_checkboxes ) ;
      lightGray_checkbox  =  new Checkbox( "lightGray",
                                          false, color_selection_checkboxes ) ;

      cyan_checkbox.addItemListener( this ) ;
      magenta_checkbox.addItemListener( this ) ;
      green_checkbox.addItemListener( this ) ;
      lightGray_checkbox.addItemListener( this ) ;

      panel_for_checkboxes_and_scrollbar.add( cyan_checkbox ) ;
      panel_for_checkboxes_and_scrollbar.add( magenta_checkbox ) ;
      panel_for_checkboxes_and_scrollbar.add( green_checkbox ) ;
      panel_for_checkboxes_and_scrollbar.add( lightGray_checkbox ) ;

      add( "South", panel_for_checkboxes_and_scrollbar ) ;
   }


   public void adjustmentValueChanged( AdjustmentEvent event )
   {
      if ( event.getSource()  ==  height_scrollbar )
      {
         rectangle_height  =  height_scrollbar.getValue() ;
      }
      else if ( event.getSource()  ==  width_scrollbar )
      {
         rectangle_width  =  width_scrollbar.getValue() ;
      }

      repaint() ;
   }

   public void itemStateChanged( ItemEvent event )
   {
      if ( event.getItemSelectable()  ==  cyan_checkbox )
      {
         rectangle_color  =  Color.cyan ;
      }
      else if ( event.getItemSelectable()  ==  magenta_checkbox )
      {
         rectangle_color  =  Color.magenta ;
      }
      else if ( event.getItemSelectable()  ==  green_checkbox )
      {
         rectangle_color  =  Color.green ;
      }
      else if ( event.getItemSelectable()  ==  lightGray_checkbox )
      {
         rectangle_color  =  Color.lightGray ;
      }

      repaint() ;
   }


   public void paint( Graphics graphics )
   {
      graphics.setColor( rectangle_color ) ;

      graphics.fillRect( 

             rectangle_center_position_x - rectangle_width / 2,

             rectangle_center_position_y - rectangle_height / 2,

             rectangle_width, rectangle_height ) ;

      graphics.setColor( Color.black ) ;

      graphics.drawRect( 

             rectangle_center_position_x - rectangle_width / 2,

             rectangle_center_position_y - rectangle_height / 2,

             rectangle_width, rectangle_height ) ;

      graphics.drawString( "Width: "   +  rectangle_width  +
                           "  Height: "  +  rectangle_height,
                           20, 20 ) ;

   }
}