mirror of
https://github.com/mihakralj/QuanTAlib.git
synced 2026-08-03 11:47:44 +00:00
Miha Kralj
24e86d762a
- Updated BBWN, BBWP, CCV, CV, CVI, EWMA, GKV, HLV, HV, Jvolty, JVOLTYN, MASSI, NATR, RSV, RV, RVI, TR, UI, VOV, VR, YZV indicators with documentation links. - Added documentation links for Aberration, Acceleration Bands, Andrews' Pitchfork, Adaptive Price Zone, ATR Bands, Bollinger Bands, Center of Gravity, Donchian Channels, Decay Min-Max Channel, Detrended Synthetic Price, EACP, EBSW, HOMOD, Jurik Volatility Bands, Keltner Channel, MA Envelope, Min-Max Channel, Price Channel, Regression Channels, Standard Deviation Channel, Stoller Average Range Channel, Super Trend Bands, Ultimate Bands, Ultimate Channel, VWAP Bands, and VWAP with Standard Deviation Bands.
69 lines
2.5 KiB
Plaintext
69 lines
2.5 KiB
Plaintext
// The MIT License (MIT)
|
|
// © mihakralj
|
|
//@version=6
|
|
indicator("Directional Movement Index (DX)", "DX", overlay=false)
|
|
|
|
//@function Calculates DX using Wilder's smoothing with compensated RMA
|
|
//@param period Number of bars used in the calculation
|
|
//@returns tuple of DX value, +DI, -DI
|
|
//@optimized Uses Wilder's smoothing (RMA) with warmup compensation for accurate values from bar 1
|
|
dx(simple int period) =>
|
|
if period <= 0
|
|
runtime.error("Period must be greater than 0")
|
|
float alpha = 1.0 / period
|
|
float beta = 1.0 - alpha
|
|
float tr = 0.0
|
|
float plus_dm = 0.0
|
|
float minus_dm = 0.0
|
|
if na(close[1])
|
|
tr := high - low
|
|
else
|
|
tr := math.max(high - low, math.max(math.abs(high - close[1]), math.abs(low - close[1])))
|
|
float upMove = high - high[1]
|
|
float downMove = low[1] - low
|
|
if upMove > downMove and upMove > 0
|
|
plus_dm := upMove
|
|
if downMove > upMove and downMove > 0
|
|
minus_dm := downMove
|
|
var bool warmup = true
|
|
var float e = 1.0
|
|
var float tr_ema = 0.0
|
|
var float tr_result = tr
|
|
var float plus_dm_ema = 0.0
|
|
var float plus_dm_result = plus_dm
|
|
var float minus_dm_ema = 0.0
|
|
var float minus_dm_result = minus_dm
|
|
tr_ema := alpha * (tr - tr_ema) + tr_ema
|
|
plus_dm_ema := alpha * (plus_dm - plus_dm_ema) + plus_dm_ema
|
|
minus_dm_ema := alpha * (minus_dm - minus_dm_ema) + minus_dm_ema
|
|
if warmup
|
|
e *= beta
|
|
float c = 1.0 / (1.0 - e)
|
|
tr_result := c * tr_ema
|
|
plus_dm_result := c * plus_dm_ema
|
|
minus_dm_result := c * minus_dm_ema
|
|
warmup := e > 1e-10
|
|
else
|
|
tr_result := tr_ema
|
|
plus_dm_result := plus_dm_ema
|
|
minus_dm_result := minus_dm_ema
|
|
float plus_di = tr_result != 0.0 ? 100.0 * plus_dm_result / tr_result : 0.0
|
|
float minus_di = tr_result != 0.0 ? 100.0 * minus_dm_result / tr_result : 0.0
|
|
float di_sum = plus_di + minus_di
|
|
float dx_value = di_sum != 0.0 ? 100.0 * math.abs(plus_di - minus_di) / di_sum : 0.0
|
|
[dx_value, plus_di, minus_di]
|
|
|
|
// ---------- Main loop ----------
|
|
|
|
// Inputs
|
|
i_period = input.int(14, "Period", minval=1, tooltip="Number of bars used in the calculation")
|
|
|
|
// Calculation
|
|
[dx_value, plus_di, minus_di] = dx(i_period)
|
|
|
|
// Plot
|
|
plot(dx_value, "DX", color=color.yellow, linewidth=2)
|
|
plot(plus_di, "+DI", color=color.green, linewidth=1)
|
|
plot(minus_di, "-DI", color=color.red, linewidth=1)
|
|
hline(25, "Strong Trend Threshold", color=color.gray, linestyle=hline.style_dashed)
|