[amibroker] AFL code to draw Swing Line - Need Help

["wongloktim" <wloktim@xxxxxxxxxxxxxx>]

The following is my AFL code:

--------------------------------------------------------------
 function GannSwing(H,L,C)
{/*{Market swing is defined as:
  Up = 2 higher highs,
  Down = 2 lower lows.}*/
  Us=BarsSince(Sum(H>Ref(H,-1),2)==2);
  Ds=BarsSince(Sum(L<Ref(L,-1),2)==2);
  Hc=HighestSince(Us==0,H,1);
  Lc=LowestSince(Ds==0,L,1);
  Sd1=IIf(Us==0,
     IIf((L!=Lc) AND (Ref(L,-1)!=Lc),
     1,
     0),
     IIf(Ds==0,
     IIf((H!=HC) AND (Ref(H,-1)!=Hc),
     -1,
     0),
     0));
  Sd2=IIf(Sd1==1,
     IIf(Ref(BarsSince(Sd1==1),-1) >
     Ref(BarsSince(Sd1==-1),-1),
     1,
     0),
     IIf(Sd1==-1,
     IIf(Ref(BarsSince(Sd1==1),-1) <
     Ref(BarsSince(Sd1==-1),-1),
     -1,
     0),
     0));
  TD1=ValueWhen(Sd2!=0,Sd2,1);
  
  return TD1;
}

function SwingGann()
{
   BarHigh=0;
   BarLow=0;
   MyHigh=-9999;
   MyLow=9999;
   M=GannSwing(H,L,C);

   for(i=0; i<BarCount; i++)
   { 
      if(M[i]>0)
        {if(H[i]>=MyHigh)
          { MyHigh=H[i];   
            BarHigh=i;
            myLow=9999;
            Swing[BarLow]=MyLow;}
        }     
      else
       {if(M[i]<0)
         {if(L[i]<=MyLow)
           { MyLow=L[i];
             BarLow=i; 
             myHigh=-9999;
             Swing[BarHigh]=MyHigh;}
         }} 
   } 
   return Swing;
} 

Plot(-SwingGann(),"",colorYellow);

----------------------------------------------------------

Problem:
1)AFL code to Convert -SwingGann value 9999 as High,
  -SwingGann value -9999 as low, and draw Swing Lines
2)How to eliminate -SwingGann Zero value or convert to null

Thank anyone can provide the codes







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