//Trend Manager- Translated by karthikmarar from MT4 code for inditraders.com forum
//AFL works on amibroker version 5.20 and above
SetChartBkColor(colorBlack);
p=Param("period",7,3,20,1); 
pl1=ParamToggle("Plot Stoploss line","No,Yes",0);
pl2=ParamToggle("Plot Setup signals","No,Yes",0);


Hx=IIf(H<Ref(H,-p),Ref(H,-p),H);
Lx=IIf(L>Ref(L,-p),Ref(L,-p),L);

Hxl=IIf(H<Ref(H,-p),Ref(H,-p),H);
Lxl=IIf(L>Ref(L,-p),Ref(L,-p),L);
spana=(Hx+Lx)/2;
spanb=Ref(spana,-2);
for( i = p; i < BarCount; i++ ) 
{
if (spana[i]>spanb[i])
   {
    H1[i]=spana[i];  
    L1[i]=spanb[i];
    O1[i]=L1[i];
    C1[i]=H1[i];
    }
else
   {
    H1[i]=spanb[i];  
    L1[i]=spana[i];
    O1[i]=H1[i];
    C1[i]=L1[i];
    }
}

SetBarFillColor( IIf(C>spanb,colorBlue,colorRed) );
PlotOHLC(O1,H1,L1,C1,"",IIf(H>spana,colorBlack,colorBlack),ParamStyle("Plot Style",styleBar,maskPrice));
Plot(C,"",ParamColor("Bar Color",colorLime),128+4);
pd=(C>spanb AND Ref(C,-1)>Ref(spanb,-1));
nd=(C<spana AND Ref(C,-1)<Ref(spana,-1));
Buysetup= PD;
Shortsetup=nd;
Buysetupvalid=Flip (Buysetup, Shortsetup);
Shortsetupvalid=Flip (Shortsetup, Buysetup);
Buy=Cover= Ref (Buysetupvalid, - 1) ==1 AND H>ValueWhen (buysetup, H) +0.01;
Short=Sell=Ref (Shortsetupvalid, - 1) ==1 AND L<ValueWhen (Shortsetup, L) - 0.01;
Buy=ExRem (Buy, Sell);
Sell=ExRem (Sell, Buy);
Short=ExRem (Short, Cover);
Cover=ExRem (Cover, Short);
inlong=Flip(Buy,Sell);
inshort=Flip(Sell,Buy);
Plot(IIf(Buysetup AND pl1,spanb,Null),"",colorRed,styleDashed);
Plot(IIf(shortsetup AND pl1,spanb,Null),"",colorRed,styleDashed);
shortsetupvalid=ExRem (shortsetupvalid, buysetupvalid);
buysetupvalid=ExRem (buysetupvalid, shortsetupvalid);
PlotShapes (IIf (shortsetupvalid AND pl2,shapeDownTriangle, shapeNone), colorRed, 0, H, - 40); 
PlotShapes (IIf (buysetupvalid AND pl2,shapeUpTriangle, shapeNone), colorGreen, 0, L, - 40);


SetChartOptions(0,chartShowArrows|chartShowDates);
Title = StrFormat("{{NAME}} - {{INTERVAL}} {{DATE}} Open %g, Hi %g, Lo %g, Close %g (%.1f%%) {{VALUES}}", O, H, L, C, SelectedValue( ROC( C, 1 ) ) )+
 "\n"+"tm High = "+WriteVal(spana,1.4)
 + "\n"+"tm Low = "+WriteVal(spanb,1.4);