Hull MA x4 acc

// by AkhIL (http://akhil.ru)
// buy when bars turns from red to middle green and sale when values become middle red
// do not wrok in side move

study(title = "Hull MA x4 accelerator", shorttitle="HMAx4 acc")
source = close, length = input(20, minval=1)
hullma1 = wma(2*wma(source, length/2)-wma(source, length), round(sqrt(length)))
hullma2 = wma(2*wma(source, length)-wma(source, length*2), round(sqrt(length*2)))
hullma3 = wma(2*wma(source, length*2)-wma(source, length*4), round(sqrt(length*4)))
hullma4 = wma(2*wma(source, length*4)-wma(source, length*8), round(sqrt(length*8)))

up = ((close > hullma1) + (close > hullma2) + (close > hullma3) + (close > hullma4))
// down = ((close < hullma1) + (close < hullma2) + (close < hullma3) + (close < hullma4))

plot(up / 4 * 100, color=green, style=columns)
plot(up / 4 * 100, color=red, style=columns, histbase=100)