Pine script source code of the bull market support band

Bullband.pine

// This source code is subject to the terms of the Mozilla Public License 2.0 at https://mozilla.org/MPL/2.0/ 
// © TheTradingParrot 
 
//@version=5 
indicator("TTP Bull Market Support band", overlay = true) 
 
sma = request.security(syminfo.tickerid, "1W", ta.sma(close, 20)) 
ema = request.security(syminfo.tickerid, "1W", ta.ema(close, 21)) 
 
s = plot(sma, "sma",color= color.red,linewidth=2 ) 
e = plot(ema, "ema",color= color.green, linewidth=2) 
 
c = ema < sma ? color.new(color.red, 50) : color.new(color.green, 50) 
fill(s,e, c)