Calling an indicator

Im new to the coding language in prorealtime and hope somebody could give me a hint on this issue.

I have an indicator that draw stochastic divergence lines, see below.
From an automatic trading robot I know I can CALL this indicator by:

myStoch, my0 = CALL "mydivergence4"[14, 1, 3, 100]

In my trading system that calls the indicator, how can I know exactly when a divergence line is drawn so I can make a decision if I want to buy or sell.
Is it possible to find out from the myStoch variable that is returned in the CALL request, or, do I have to incorporate the indicator code into my trading robot and do SELL or BUY instead of drawsegment?

StochPrd = 9 
KPrd = 1 
DPrd = 3 
N = 100
 
StochD = Stochasticd[StochPrd,KPrd,DPrd](close)
Offset = .01
IF (BarIndex > 10+1+N) THEN
// short
IF (StochD[1]>StochD AND StochD[1]>StochD[2]) THEN
extremum2=StochD[1]
extremum1=highest[N](StochD)
preciomax2=close[1]
preciomax=Highest[N](close)
IF(extremum2<extremum1 AND preciomax2>preciomax[1]) THEN
for i=1 to N
if StochD[i]=extremum1 then
zz=i
drawsegment (barindex[1], StochD[1]+Offset, barindex[zz], StochD[zz]+Offset) coloured(200,0,0)
endif
next
endif
endif
// long
IF (StochD[1]<StochD AND StochD[1]<StochD[2]) THEN
extremum22=StochD[1]
extremum11=lowest[N](StochD)
preciomin2=close[1]
preciomin=lowest[N](close)
IF(extremum22>extremum11 AND preciomin2<preciomin[1]) THEN
for i2=1 to N
if StochD[i2]=extremum11[1] then
zz2=i2
drawsegment(barindex[1], StochD[1]-Offset, barindex[zz2], StochD[zz2]-Offset) coloured(0,200,0)
endif
next
ENDIF
ENDIF
endif
return StochD as "Stoch", 0 as "0"