On Balance Volume with candles
// This source code is subject to the terms of the Mozilla Public License 2.0 at https://mozilla.org/MPL/2.0/
// © siddhugaddi

//@version=4
study("On Balance Volume", "OBV")
linestyle = input(defval = 'Candle', title = "Style", options = ['Candle', 'Line'])
hacandle = input(defval = false, title = "Heikin Ashi Candles?")
showma1 = input(defval = false, title = "SMA 1", inline = "ma1")
ma1len = input(defval = 50, title = "", minval = 1, inline = "ma1")
ma1col = input(defval = color.lime, title = "", inline = "ma1")
showma2 = input(defval = false, title = "SMA 2", inline = "ma2")
ma2len = input(defval = 200, title = "", minval = 1, inline = "ma2")
ma2col = input(defval = color.red, title = "", inline = "ma2")
showema1 = input(defval = false, title = "EMA 1", inline = "ema1")
ema1len = input(defval = 13, title = "", minval = 1, inline = "ema1")
ema1col = input(defval = color.lime, title = "", inline = "ema1")
showema2 = input(defval = false, title = "EMA 2", inline = "ema2")
ema2len = input(defval = 50, title = "", minval = 1, inline = "ema2")
ema2col = input(defval = color.red, title = "", inline = "ema2")
showema3 = input(defval = false, title = "EMA 3", inline = "ema3")
ema3len = input(defval = 200, title = "", minval = 1, inline = "ema3")
ema3col = input(defval = color.yellow, title = "", inline = "ema3")
colorup = input(defval = color.lime, title = "Body", inline = "bcol")
colordown = input(defval = color.red, title = "", inline = "bcol")
bcolup = input(defval = #74e05e, title = "Border", inline = "bocol")
bcoldown = input(defval = #ffad7d, title = "", inline = "bocol")
wcolup = input(defval = #b5b5b8, title = "Wicks", inline = "wcol")
wcoldown = input(defval = #b5b5b8, title = "", inline = "wcol")

tw = high - max(open, close) 
bw = min(open, close) - low 
body = abs(close - open) 

_rate(cond) =>
    ret = 0.5 * (tw + bw + (cond ? 2 * body : 0)) / (tw + bw + body) 
    ret := nz(ret) == 0 ? 0.5 : ret
    ret
    
deltaup =  volume * _rate(open <= close) 
deltadown = volume * _rate(open > close)
delta = close >= open ? deltaup : -deltadown
cumdelta = cum(delta)
float ctl = na
float o = na
float h = na
float l = na
float c = na
if linestyle == 'Candle'
    o := cumdelta[1]
    h := max(cumdelta, cumdelta[1])
    l := min(cumdelta, cumdelta[1])
    c := cumdelta
    ctl
else
    ctl := cumdelta

plot(ctl, title = "CDV Line", color = color.blue, linewidth = 2)

float haclose = na
float haopen = na
float hahigh = na
float halow = na
haclose := (o + h + l + c) / 4
haopen  := na(haopen[1]) ? (o + c) / 2 : (haopen[1] + haclose[1]) / 2
hahigh  := max(h, max(haopen, haclose))
halow   := min(l,  min(haopen, haclose))
 
c_ = hacandle ? haclose : c
o_ = hacandle ? haopen : o
h_ = hacandle ? hahigh : h
l_ = hacandle ? halow : l

plotcandle(o_, h_, l_, c_, title='CDV Candles', color = o_ <= c_ ? colorup : colordown, bordercolor = o_ <= c_ ? bcolup : bcoldown, wickcolor = o_ <= c_ ? bcolup : bcoldown)

plot(showma1 and linestyle == "Candle" ? sma(c_, ma1len) : na, title = "SMA 1", color = ma1col)
plot(showma2 and linestyle == "Candle"  ? sma(c_, ma2len) : na, title = "SMA 2", color = ma2col)
plot(showema1 and linestyle == "Candle"  ? ema(c_, ema1len) : na, title = "EMA 1", color = ema1col)
plot(showema2 and linestyle == "Candle"  ? ema(c_, ema2len) : na, title = "EMA 2", color = ema2col)
plot(showema3 and linestyle == "Candle"  ? ema(c_, ema3len) : na, title = "EMA 3", color = ema3col)
