نمونه‌ها: میانگین متحرک و روند

// A simple moving average: the mean of the last `length` closes.
// This is a complete indicator; the header says what kind of script it is.
indicator "Simple moving average"
    edition = 1
    display = price

input length: int = 20, name = "Length", min = 1
let average = tech.sma(close, length)
plot(average, name = "SMA", color = color.orange, width = 2)

// Two exponential moving averages and a mark where the fast one crosses the slow one.
// EMA(t) = alpha * price + (1 - alpha) * EMA(t - 1), with alpha = 2 / (length + 1).
indicator "EMA pair"
    edition = 1
    display = price

input fast_length: int = 12, name = "Fast length", min = 1
input slow_length: int = 26, name = "Slow length", min = 2
let fast = tech.ema(close, fast_length)
let slow = tech.ema(close, slow_length)
plot(fast, name = "Fast", color = color.green)
plot(slow, name = "Slow", color = color.red)
mark.shape(
    tech.crosses_above(fast, slow),
    name = "Up",
    shape = triangle_up,
    place = below,
    color = color.green,
)
mark.shape(
    tech.crosses_below(fast, slow),
    name = "Down",
    shape = triangle_down,
    place = above,
    color = color.red,
)

// A background that follows the trend: green above the moving average, red below it, nothing while it is not known yet.
indicator "Trend background"
    edition = 1
    display = price

input length: int = 50, name = "Length", min = 2
let trend = tech.sma(close, length)
let tint = if close > trend then color.fade(color.green, 88) else color.fade(color.red, 88)
chart.background(if is_na(trend) then na else tint, name = "Trend")
plot(trend, name = "Trend line", color = color.gray)

// Candles coloured by the trend: green while the close is above the moving average, red below it.
indicator "Trend candles"
    edition = 1
    display = price

input length: int = 50, name = "Length", min = 2
let trend = tech.ema(close, length)
let tint = if close > trend then color.green else color.red
chart.candles(if is_na(trend) then na else tint, name = "Trend candles")
plot(trend, name = "Trend line", color = color.gray)

// How far the close is from its moving average, in percent of the average.
// Above zero the close is above the average; the further from zero, the more stretched the move.
indicator "Distance from the average"
    edition = 1
    display = pane

input length: int = 50, name = "Length", min = 2
let average = tech.ema(close, length)
let distance = 100 * (close - average) / average
plot(
    distance,
    name = "Distance %",
    style = histogram,
    color = if distance >= 0 then color.green else color.red,
)
level(0, name = "Zero", color = color.gray)

// A request for another timeframe: the 4-hour EMA of the close, drawn on whatever chart the script is on.
// `data.series` evaluates the expression on the other timeframe and gives back its last closed value.
indicator "Higher timeframe average"
    edition = 1
    display = price

input tf: tf = "240", name = "Timeframe"
input length: int = 20, name = "Length", min = 2
let other = data.series(tf, tech.ema(close, length), symbol = symbol.id)
plot(other, name = "EMA on the other timeframe", color = color.orange, width = 2)
plot(tech.ema(close, length), name = "EMA on this chart", color = color.gray)