 # High-Low Difference Channels - SMA/EMA I wrote this up as a potential replacement for my BB based strategies, and so far it's looking pretty nice.

Description / Usage:
• Adjust length and multiplier much the same way you would expect with Bollinger Bands .
• Multiplier of 1 gives you a base channel consisting of one high, and one low sourced SMA (or EMA )
• The outer channels are increments of the base channels width, away from the median hl2 sourced SMA (..or EMA )

Added (optional) select-able fixed resolutions, so you can have 1 hour bands on your 1 minute chart if you do so feel inclined.

Otherwise just some minor code cleaning and proper commenting:

```//@version=2

study(title="High-Low Difference Channels - SMA/EMA", shorttitle="HLDC", overlay=true)

// Revision:    1
// Author:      JayRogers
// Reasoning:   I wrote this up as a potential replacement for my BB based strategies, and so far it's
//              looking pretty nifty.
//
// Description / Usage:
//
//  - Adjust length and multiplier much the same way you would expect with Bollinger Bands.
//  - multiplier of 1 gives you a base channel consisting of one high, and one low sourced SMA (or EMA)
//  - The outer channels are increments of the base channels width, away from the median hl2 sourced SMA (..or EMA)

hlc_length      = input(50, title="Channel Length", minval=1)
hlc_diffMult    = input(1.5, title="Difference Multiplier", minval=0.1, maxval=50)
hlc_useEMA      = input(false, title="Use EMA instead of SMA?")

hl2_line    = hlc_useEMA ? ema(hl2, hlc_length) : sma(hl2, hlc_length)
high_line   = hlc_useEMA ? ema(high, hlc_length) : sma(high, hlc_length)
low_line    = hlc_useEMA ? ema(low, hlc_length) : sma(low, hlc_length)

diffMult(num) =>
hldm = (high_line - low_line) * hlc_diffMult
r = hldm * num

midline     = plot(hl2_line, title="Midline", color=silver, transp=0)

highLine    = plot(hl2_line + (diffMult(1) / 2), title="Center Channel Upper", color=silver, transp=100)
lowLine     = plot(hl2_line - (diffMult(1) / 2), title="Center Channel Lower", color=silver, transp=100)

diffUp1     = plot(hl2_line + diffMult(1), title="High Diff 1", color=silver, transp=0)
diffUp2     = plot(hl2_line + diffMult(2), title="High Diff 2", color=silver, transp=0)
diffUp3     = plot(hl2_line + diffMult(3), title="High Diff 3", color=silver, transp=0)

diffDown1   = plot(hl2_line - diffMult(1), title="Low Diff 1", color=silver, transp=0)
diffDown2   = plot(hl2_line - diffMult(2), title="Low Diff 2", color=silver, transp=0)
diffDown3   = plot(hl2_line - diffMult(3), title="Low Diff 3", color=silver, transp=0)

fill(highLine, lowLine, title="Center High-Low Fill", color=silver, transp=50)```