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https://github.com/mihakralj/QuanTAlib.git
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Miha Kralj
47 lines
1.5 KiB
Plaintext
47 lines
1.5 KiB
Plaintext
// Licensed under the Apache License, Version 2.0
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// © mihakralj
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//@version=6
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indicator("Ehlers Directional Movement with Hann (DMH)", "DMH", overlay=false)
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//@function Calculates DMH (Ehlers Directional Movement with Hann Windowing)
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//@param period Number of bars used in the calculation
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//@returns dmh value
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dmh(simple int period = 14) =>
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if period <= 0
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runtime.error("Period must be greater than 0")
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float sf = 1.0 / period
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// Stage 1: Classic DM extraction
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float upperMove = na(high[1]) ? 0.0 : high - high[1]
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float lowerMove = na(low[1]) ? 0.0 : low[1] - low
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float plusDM = 0.0
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float minusDM = 0.0
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if upperMove > lowerMove and upperMove > 0
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plusDM := upperMove
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else if lowerMove > upperMove and lowerMove > 0
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minusDM := lowerMove
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// Stage 2: EMA smoothing
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var float ema = 0.0
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ema := sf * (plusDM - minusDM) + (1.0 - sf) * ema
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// Stage 3: Hann FIR filter on EMA history
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float dmSum = 0.0
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float coef = 0.0
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for count = 1 to period
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float w = 1.0 - math.cos(2.0 * math.pi * count / (period + 1))
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dmSum += w * nz(ema[count - 1])
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coef += w
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float result = coef != 0 ? dmSum / coef : 0.0
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result
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// Inputs
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i_period = input.int(14, "Period", minval=1, tooltip="Number of bars used in the calculation")
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// Calculate DMH
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dmhVal = dmh(i_period)
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// Plot
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hline(0, "Zero", color=color.gray, linestyle=hline.style_dotted)
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plot(dmhVal, "DMH", color=color.yellow, linewidth=2)
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