Ladder StDev

// This source code is subject to the terms of the Mozilla Public License 2.0 at https://mozilla.org/MPL/2.0/
// © jason5480

//@version=5
indicator(title = 'Ladder StDev',
          shorttitle = 'LStDev',
          timeframe = '',
          timeframe_gaps = true)

import HeWhoMustNotBeNamed/arraymethods/1

// INPUT ============================================================================================================
stdevSrc = input.source(defval = close, title = 'StDev Src/Len', inline = 'StDev')
stdevLength = input.int(defval = 20, title = '', minval = 1, tooltip = 'The source and the length to be used for the StDev calculation.', inline = 'StDev')

// LOGIC ============================================================================================================
var positiveStDevs = array.new<float>()
var negativeStDevs = array.new<float>()

if(close > open)
    positiveStDevs.push(stdevSrc, stdevLength)
else
    negativeStDevs.push(stdevSrc, stdevLength)

float ladderPositiveStDev = array.stdev(positiveStDevs, stdevLength)
float ladderNegativeStDev = array.stdev(negativeStDevs, stdevLength)

// PLOT =============================================================================================================
var positiveColor = color.new(#26A69A, 0)
plot(series = ladderPositiveStDev, title = 'Positive StDev', color = positiveColor, linewidth = 1, style = plot.style_line, trackprice = true)
var negativeColor = color.new(#EF5350, 0)
plot(series = ladderNegativeStDev, title = 'Negative StDev', color = negativeColor, linewidth = 1, style = plot.style_line, trackprice = true)