Bollinger Band Cloud

[MakePlays]

#BollingerCloud

input price = close;
input displace = 0;
input length = 20;
input Num_Dev_Dn = -2.0;
input Num_Dev_up = 2.0;

def sDev = StDev(data = price[-displace], length = length);

plot MidLine = ExpAverage(data = price[-displace], length = length);
plot LowerBand = MidLine + Num_Dev_Dn * sDev;
plot UpperBand = MidLine + Num_Dev_up * sDev;

LowerBand.SetDefaultColor(Color.CYAN);
LowerBand.SetLineWeight(2);
MidLine.SetDefaultColor(Color.LIGHT_GRAY);
UpperBand.SetDefaultColor(Color.CYAN);
UpperBand.SetLineWeight(2);


AddCloud(if price >= MidLine then UpperBand else LowerBand,  LowerBand,  Color.GREEN);
AddCloud(if price <= MidLine then LowerBand else UpperBand,  UpperBand,  Color.RED);