void Kropka(Graphics kt,int x,int y)
  {
   if(x>=0&&x<getWidth())
   {
   if(y<=h[x])
    {
      kt.drawLine(x,y,x,y);
      h[x]=y;
     }
      
  }
}
//--------------------------------------------------------  
  void Odcinek(Graphics kt,Punkt p,Punkt k)
  { 
  int dx,dy,d,x,y,d1,d2,sx,sy;
  dx=Math.abs(k.x-p.x);
  dy=Math.abs(k.y-p.y);  
  if(k.x>=p.x)sx=1;else sx=-1;
  if(k.y>=p.y)sy=1;else sy=-1;
  x=p.x;
   y=p.y;  
   if (dx>=dy)
    {
     d=2*dy-dx;
     d1=2*dy;
     d2=2*(dy-dx);
     Kropka(kt,x,y);
      while (x!=k.x)
      {
         if(d<0){d+=d1;x+=sx;}else{x+=sx;y+=sy;d+=d2;}
	     Kropka(kt,x,y);
      }
    }
      else  //dx<dy
      {
       d=2*dx-dy;
       d1=2*dx;
       d2=2*(dx-dy);
       Kropka(kt,x,y);
        while (y!=k.y)
        {
          if(d<0){d+=d1;y+=sy;}else{x+=sx;y+=sy;d+=d2;}
	      Kropka(kt,x,y);
        }
      }
 }