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

public class GraphicsFrame
{
  private final int LIST_MAX = 500;
  private int endOfList;
  private Drawable[] drawList;

  private JFrame f;
  private DrawPanel drawPan;

  public GraphicsFrame()
  {
    endOfList = -1; // list empty
    drawList = new Drawable[ LIST_MAX ];

    f = new JFrame("Draw Stuff!");
    drawPan = new DrawPanel();
    f.add( drawPan );
    f.setDefaultCloseOperation( JFrame.EXIT_ON_CLOSE );
    f.setSize(800,800);
    f.setVisible( true );
  }

  public void add( Drawable d )
  {
    if (endOfList + 1 < LIST_MAX)
    {
      endOfList++;
      drawList[endOfList] = d;
    }
    else
    {
     System.out.println("Draw list full");
    }

    drawPan.repaint();
  }

  public void redraw()
  {
    drawPan.repaint();
  }


  private class DrawPanel extends JPanel
  {
    public void paintComponent( Graphics g )
    {
      for( int i=0; i <= endOfList; i++ )
      {
        drawList[ i ].draw( g );
      }
    }
  }// end of DrawPanel

}