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Trend Resistance Line / Channel

The indicator below plots a resistance line from 2 highs (peaks) and plots a channel from
a low (trough) between the two peaks. Indicator is period based.

How do you modify this indicator to plot a Support line from two lows (troughs) a parallel channel line from a high (peak)?

I've understood only part of the code (till the calculation of slope).


Trend Resistance Line / Channel

pds:=Input("Lookback Periods",2,100,5);
hic:= H>Ref(HHV(H,pds),-1) AND H>=Ref(HHV(H,pds),pds);
y1t:=LastValue(ValueWhen( 2, hic=1, H ));
y2t:=LastValue(ValueWhen( 1, hic=1, H ));
x1t:=LastValue(ValueWhen( 2, hic=1 , Cum(1) ));
x2t:=LastValue(ValueWhen( 1, hic=1 , Cum(1) )); {at:=(y1t-y2t)/(x1t-x2t);bt:=y1t-at*x1t;}
e1:=H-yt; ret1:=LastValue(Cum(1)-(x1t+Int((x2t-x1t)/2)-1));
y2:=LastValue(ValueWhen(1,x2=Cum(1),H)); {a:=(y1-y2)/(x1-x2);b:=y1-a*x1;}
HiTL:=If(Cum(1)>x1t-5,(y1-y2)/(x1-x2)*Cum(1)+y1-(y1-y2)/(x1-x2) *x1,BarsSince(Cum(1)>x1t-5)); Diff:=Ref(HiTL-L,-LastValue(Cum(1)-x2t)); decal:=LastValue(HHV(Diff,x2t-x1t));


Trend Resistance Line / Channel
Source / From: TOP
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