Setting position size in sigScaleOut and sigScaleIn events

AFL Programming
1

Hello,

I am trying to code a trading system that use ranking of a certain metric to decide what to buy and sell.
What i want to do is to buy the stock (with 5% of equity) if its ranking is between 5 and 10 and scale in to 10% of the equity when it's between 1 and 5 in ranking.

The sell should be the direct opposite, scale out to 50% of the position if moving from 1-5 to 5-10 and sell completely when > 10.

My problem is i don't know how to set position size to match those.

I tried searching for tutorials but nothing helped my case. Here is the code snippet doing that part.

nowCase = 0; 
betterLimit=5;
limit=10;
AddColumn(todayRank,"today"); //todayRank is the asset's rank of today
AddColumn(yesterdayRank,"yesterday"); //yesterdayRank is the asset's rank of yesterday
nowTrigger=0;
for( i = 0; i < BarCount; i++ ) 
{ 
	
       if(nowTrigger==0 && todayRank[i]<=limit && todayRank[i]>betterLimit && yesterdayRank[i]>limit) 
       { 
         nowTrigger=1;
         Buy[ i ] = 1;
         //SetPositionSize( betterLimit, spsPercentOfEquity ); 
       } 
       
	   else if(nowTrigger==1 && todayRank[i]<=betterLimit && yesterdayRank[i]>betterLimit && yesterdayRank[i]<=limit) 
       { 
         nowTrigger= 2; 
         Buy[ i ] = sigScaleIn;
         //SetPositionSize( limit, spsPercentOfEquity );
       } 
       
      else if(nowTrigger==0 && todayRank[i]<=betterLimit ) 
       { 
         nowTrigger= 2; 
         Buy[ i ] = 1;
         //SetPositionSize( limit, spsPercentOfEquity );
       } 
       else if(nowTrigger==2 && todayRank[i]>betterLimit && todayRank[i]<=limit && yesterdayRank[i]<=betterLimit) 
       { 
        nowTrigger= 1; 
         Buy[ i ] = sigScaleOut;
         //SetPositionSize( betterLimit, spsPercentOfEquity );
       } 
       
	   else if(nowTrigger==1 && todayRank[i]>limit && yesterdayRank[i]>betterLimit && yesterdayRank[i]<=limit) 
       { 
         nowTrigger = 0; 
         sell[ i ] = 1;
       } 
       
      else if(nowTrigger==2 && todayRank[i]>limit && yesterdayRank[i]<=betterLimit) 
       { 
         nowTrigger = 0; 
         Sell[ i ] = 1;
       } 
		nowCase[i]=nowTrigger;
	 
} 

SetPositionSize( 5, spsPercentOfEquity ); 
SetPositionSize( 50, spsPercentOfPosition * ( Buy == sigScaleOut ) );
SetPositionSize( 50, spsPercentOfEquity* ( Buy == sigScaleIn ) );

Regards,