지표식, 시스템식 부탁 드립니다. 

//──────────────────────────────

// INPUTS

//──────────────────────────────

length   = input.int(12, "Trend Length")

multATR  = input.float(0.6, "ATR Multiplier", step = 0.1)

//──────────────────────────────

// MARKET BIAS FUNCTION

//──────────────────────────────

calc_mb_avg(len) =>

    o = ta.ema(open, len)

    c = ta.ema(close, len)

    h = ta.ema(high, len)

    l = ta.ema(low, len)

    haclose = (o + h + l + c) / 4

    haopen  = na(haclose[1]) ? (o + c) / 2 : (haclose[1] + (o + c) / 2) / 2

    hahigh  = math.max(h, math.max(haopen, haclose))

    halow   = math.min(l, math.min(haopen, haclose))

    h2 = ta.ema(hahigh, len)

    l2 = ta.ema(halow, len)

    (h2 + l2) / 2

//──────────────────────────────

// ATR

//──────────────────────────────

atr_value = ta.sma(ta.atr(200), 200) * multATR

//──────────────────────────────

// BAND

//──────────────────────────────

mb_avg   = calc_mb_avg(length)

sma_high = mb_avg + atr_value

sma_low  = mb_avg - atr_value

//──────────────────────────────

// TREND LOGIC

//──────────────────────────────

var bool trend = na

if ta.crossover(close, sma_high) and barstate.isconfirmed

    trend := true

if ta.crossunder(close, sma_low) and barstate.isconfirmed

    trend := false

trend_value = trend ? sma_low : sma_high

//──────────────────────────────

// TREND LINE

//──────────────────────────────

plot(trend ? trend_value : na,  title="UpTrend",   style=plot.style_linebr, color=trend ? color.green : na, linewidth=2)

plot(not trend ? trend_value : na, title="DownTrend", style=plot.style_linebr, color=not trend ? color.red : na, linewidth=2)

//──────────────────────────────

// SIGNAL MARKERS

//──────────────────────────────

signal_up   = ta.change(trend) and not trend[1]

signal_down = ta.change(trend) and trend[1]

sigUp = signal_up ? low - atr_value * 2 : na

sigDn = signal_down ? high + atr_value * 2 : na

plotshape(sigUp, "", shape.triangleup,   location.absolute, color.green, size=size.small)

plotshape(sigDn, "", shape.triangledown, location.absolute, color.red,   size=size.small)