Ultimate Oscillator Cross Markers

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-- SPDX-License-Identifier: MIT
-- IQOptionWiki QCS Library
-- IQOW Ultimate Oscillator Cross Markers v1.0.0
--
-- Price-chart companion of IQOW Ultimate Oscillator Cross
-- (ultimate-oscillator). It draws no lines: only that script's HIGHER and
-- LOWER markers, above and below the candles on the price chart. A script with
-- its own panel draws its markers at the candle's price on the panel's axis,
-- so on assets priced above about 100 (for example JPY pairs) they fall
-- outside the panel. Add IQOW Ultimate Oscillator Cross as well to see the
-- Ultimate Oscillator line. Keep the settings of both scripts equal.
--
-- The Ultimate Oscillator (Larry Williams) blends buying pressure over three
-- periods (7, 14, 28) into one 0-100 line, which makes it less jumpy than a
-- single-period oscillator. This script marks the line leaving an extreme.
--
-- HIGHER: the oscillator closes above 30 after being at or below it.
-- LOWER:  the oscillator closes below 70 after being at or above it.
--
-- Markers use the previous completed candle: they appear after the next candle
-- opens and are shifted back one bar onto the candle that qualified.
-- Educational chart tool only. It does not place trades, choose an expiry,
-- predict outcomes, or guarantee results. Test on a Practice balance first.

instrument {
    name = "IQOW Ultimate Oscillator Cross Markers",
    short_name = "MK UO",
    overlay = true
}

input_group {
    "1. Ultimate Oscillator",
    period_fast = input (7, "Fast period", input.integer, 1, 50),
    period_medium = input (14, "Medium period", input.integer, 2, 100),
    period_slow = input (28, "Slow period", input.integer, 3, 200),
    oversold_level = input (30, "Oversold level", input.double, 5, 45, 1, false),
    overbought_level = input (70, "Overbought level", input.double, 55, 95, 1, false)
}

input_group {
    "Display and advice",
    signals_visible = input { default = true, type = input.plot_visibility },
    advice_enabled = input { default = false, name = "Enable platform advice", type = input.boolean }
}

input_group {
    "Colors",
    higher_color = input { default = "#25E154", type = input.color },
    lower_color = input { default = "#FF6C58", type = input.color },
    signal_text_color = input { default = "#FFFFFF", type = input.color }
}

-- Buying pressure and true range, summed over three periods (official formula).
buying_pressure = close - min (low, close [1])

average_fast = sum (buying_pressure, period_fast) / max (sum (tr, period_fast), 1e-10)
average_medium = sum (buying_pressure, period_medium) / max (sum (tr, period_medium), 1e-10)
average_slow = sum (buying_pressure, period_slow) / max (sum (tr, period_slow), 1e-10)

uo_value = (100 / 7) * (4 * average_fast + 2 * average_medium + average_slow)

local uo_now = get_value (uo_value, nil)
local uo_previous = get_value (uo_value [1], nil)

-- Periods must be ordered fast < medium < slow and levels must not overlap.
local settings_are_valid =
    period_fast < period_medium and
    period_medium < period_slow and
    oversold_level < overbought_level

-- The slowest sum needs period_slow candles plus one for close [1].
local data_is_ready =
    settings_are_valid and
    uo_now ~= nil and
    uo_previous ~= nil and
    get_value (close [period_slow], nil) ~= nil

-- Event: the line closes back across a level on this candle.
higher_setup = conditional (
    data_is_ready and uo_previous <= oversold_level and uo_now > oversold_level
)

lower_setup = conditional (
    data_is_ready and uo_previous >= overbought_level and uo_now < overbought_level
)

-- Confirm only a new setup on the previous completed candle.
confirmed_higher = conditional (
    get_value (higher_setup [1], false) and
    not get_value (higher_setup [2], false)
)

confirmed_lower = conditional (
    get_value (lower_setup [1], false) and
    not get_value (lower_setup [2], false)
)

-- Markers on the price chart: HIGHER below the candle, LOWER above it. Offset -1
-- puts each one on the candle that completed the setup (the confirmation above
-- is evaluated when the next candle opens).
if signals_visible then
    plot_shape (
        confirmed_higher,
        "UO HIGHER",
        shape_style.triangleup,
        shape_size.small,
        higher_color,
        shape_location.belowbar,
        -1,
        "HIGHER",
        signal_text_color
    )

    plot_shape (
        confirmed_lower,
        "UO LOWER",
        shape_style.triangledown,
        shape_size.small,
        lower_color,
        shape_location.abovebar,
        -1,
        "LOWER",
        signal_text_color
    )
end

-- QCS advice is a platform notification state only; it does not place trades.
if advice_enabled and
    get_value (confirmed_higher, false) and
    not get_value (confirmed_lower, false) then
    advise (advice.buy)
elseif advice_enabled and
    get_value (confirmed_lower, false) and
    not get_value (confirmed_higher, false) then
    advise (advice.sell)
else
    advise (advice.neutral)
end