import java.awt.*;

public class DrawingCanvas extends Canvas
{
   private int x = 20, y = 20;
   private int width = 10, height = 10;
   private int inc = 5;
   private Color myColor = Color.red;
   private String object = "Rectangle";

   public DrawingCanvas()
   {
      setBackground(Color.green);
   }
   public void paint(Graphics g)
   {
      g.setColor(Color.black);
      g.drawRect(0,0,size().width, size().height);
      g.setColor(myColor);
      if (object.equals("Rectangle"))
         g.fillRect(x,y,width,height);
      if (object.equals("Circle"))
         g.fillOval(x,y,width, height);
      if (object.equals("Oval"))
         g.fillOval(x,y, width, 2*height);
   }
   // private methods
   public boolean handleUp()
   {
      if (y > 0)   y = y - inc;
      else         y = size().height;
      repaint();
      return true;
   }
   public boolean handleDown()
   {
      if (y < size().height) y = y + inc;
      else                   y = 0;
      repaint();
      return true;
   }
   public boolean handleRight()
   {
      if (x < size().width) x = x + inc;
      else                  x = 0;
      repaint();
      return true;
   }
   public boolean handleLeft()
   {
      if (x > 0)  x = x - inc;
      else        x = size().width;
      repaint();
      return true;
   }
   public boolean handleIncrease()
   {
      width += 5;
      height += 5;
      repaint();
      return true;
   }
   public boolean handleDecrease()
   {
      if (width > 5)
      {
         width -= 5;
         height -= 5;
      }
      repaint();
      return true;
   }
   public boolean handleChangeObject(String s)
   {
      object = s;
      repaint();
      return true;
   }
   public boolean handleColorChange(Color color)
   {
      myColor = color;
      repaint();
      return true;
   }            
}