Ehlers Reflex Indicator [CC]

// Copyright (c) 2019-present, Franklin Moormann (cheatcountry)
// Ehlers Reflex Indicator [CC] script may be freely distributed under the MIT license.
// ------------------------------------------------------------------------------------------------
// Original author:  cheatcountry
// Original title:   Ehlers Reflex Indicator [CC]
// Licence:          MIT (the header above is the original notice, kept verbatim)
// Pine version:     5
// Fetched:          2026-10-12
// Ported to FloScript by FloSignals; modifications under MPL-2.0.
// Converter:        @flosignals/floscript 0.1.0, strict mode, score 100/100
// ------------------------------------------------------------------------------------------------
//@floscript=1
//@version=5
indicator('Ehlers Reflex Indicator [CC]', overlay=false)

inp = input(title='Source', defval=hlcc4)
res = input.timeframe(title='Resolution', defval='')
rep = input(title='Allow Repainting?', defval=false)
bar = input(title='Allow Bar Color Change?', defval=false)
src = inp[rep ? 0 : barstate.isrealtime ? 1 : 0][rep ? 0 : barstate.isrealtime ? 0 : 1]
length = input.int(title='Length', defval=20, minval=1)

a1 = math.exp(-1.414 * math.pi / (0.5 * length))
b1 = 2 * a1 * math.cos(1.414 * 180 / (0.5 * length))
c2 = b1
c3 = -a1 * a1
c1 = 1 - c2 - c3

ssf = 0.0
ssf := c1 * ((src + nz(src[1])) / 2) + c2 * nz(ssf[1]) + c3 * nz(ssf[2])

slope = (nz(ssf[length]) - ssf) / length
sum = 0.0
for i = 1 to length
    sum := sum + (ssf + i * slope - nz(ssf[i]))
sum := sum / length

ms = 0.0
ms := 0.04 * math.pow(sum, 2) + 0.96 * nz(ms[1])

reflex = ms >= 0 ? sum / math.sqrt(ms) : 0

slo = reflex - nz(reflex[1])
sig = slo > 0 ? (slo > nz(slo[1]) ? 2 : 1) : slo < 0 ? (slo < nz(slo[1]) ? -2 : -1) : 0
alertcondition(ta.crossover(sig, 1), 'Strong Buy Signal', 'Strong Bullish Change Detected')
alertcondition(ta.crossunder(sig, -1), 'Strong Sell Signal', 'Strong Bearish Change Detected')
alertcondition(ta.crossover(sig, 0), 'Buy Signal', 'Bullish Change Detected')
alertcondition(ta.crossunder(sig, 0), 'Sell Signal', 'Bearish Change Detected')
alertcondition(ta.crossover(sig, 0) or ta.crossover(sig, 1), "All Buy Signals", "Any Bullish Change Detected")
alertcondition(ta.crossunder(sig, 0) or ta.crossunder(sig, -1), "All Sell Signals", "Any Bearish Change Detected")
refColor = sig > 1 ? color.green : sig > 0 ? color.lime : sig < -1 ? color.maroon : sig < 0 ? color.red : color.white
barcolor(bar ? refColor : na)
hline(0)
plot(reflex, title='Reflex', color=refColor, linewidth=2)

This file is under the MIT License; it is a port of the original by cheatcountry, with the original licence header kept and the changes made for FloScript noted in the file.

• v22026-10-14

  Library refresh 2026-10-14

• v12026-10-12

  Library refresh 2026-10-12