ADX

// This source code is subject to the terms of the Mozilla Public License 2.0 at https://mozilla.org/MPL/2.0/
// © finally nitin
//@version=4

study(title="Directional Movement Index", shorttitle="ADX", format=format.price, precision=4, resolution="")
lensig = input(8, title="ADX", minval=1, maxval=50)
len = input(13, title="DMI length", minval=1, maxval=50)

th = input(25, title="threshold")
hline(th, title="Zero", color=color.black, linestyle=hline.style_dotted)

up = change(high)
down = -change(low)
plusDM = na(up) ? na : (up > down and up > 0 ? up : 0)
minusDM = na(down) ? na : (down > up and down > 0 ? down : 0)
trur = rma(tr, len)
plus = fixnan(100 * rma(plusDM, len) / trur)
minus = fixnan(100 * rma(minusDM, len) / trur)
sum = plus + minus
adx = 100 * rma(abs(plus - minus) / (sum == 0 ? 1 : sum), lensig)

plot(adx, color=#363A45, title="ADX")
plot(plus, color=#00897B, title="+DI")
plot(minus, color=#FF5252, title="-DI")