Custom Synthetic Smooth Price Line: Free TradingView Indicator (Pine Script)

Add It to Your TradingView Chart

1Copy the scriptPress Copy script above, or the copy button on the code below.
2Open the Pine EditorOpen a TradingView chart and choose Pine Editor at the bottom of the screen.
3Paste over the templateCreate a new indicator, select all of the template text and paste. Press Save and give it a name.
4Add it to the chartPress Add to chart, then adjust the settings with the gear icon next to its name.

Source Code

160 lines of Pine Script v6 from indicators/utilities/synthetic-smooth-price-line.pine, published under MPL-2.0 (file header). Keep the author's credit and licence lines when you reuse it.

synthetic-smooth-price-line.pine

// This Pine Script® code is subject to the terms of the Mozilla Public License 2.0 at https://mozilla.org/MPL/2.0/
// © nemesis

//@version=6
indicator(
     title="Custom Synthetic Smooth Price Line",
     shorttitle="SynthLine",
     overlay=true,
     max_lines_count=2
)

// ─────────────────────────────────────────────────────────────
// PRICE LINE INPUTS
// ─────────────────────────────────────────────────────────────

lineModeInput = input.string(title="Color Mode", defval="Candles", options=["Default", "Candles"], group="Price Line")
lineColorDefaultInput = input.color(color.silver, "Default", group="Price Line")
lineColorRisingInput = input.color(#089981, "Candles Rising", group="Price Line")
lineColorFallingInput = input.color(#f23645, "Candles Falling", group="Price Line")
lineStyleInput = input.string(title="Style", defval="Dotted", options=["Dotted", "Dashed", "Solid"], group="Price Line")
lineThicknessInput = input.string(title="Thickness", defval="1", options=["1", "2", "3", "4"], group="Price Line")
lineLengthInput = input.int(title="Length (bars)", minval=0, maxval=500, defval=150, group="Price Line")
lineExtendLeftInput = input.bool(false, "Extend Left", group="Price Line")
lineExtendRightInput = input.bool(true, "Extend Right", group="Price Line")

// ─────────────────────────────────────────────────────────────
// SECONDARY LINE INPUTS
// ─────────────────────────────────────────────────────────────

secondLineShowInput = input.bool(true, "Show Secondary Line", group="Secondary Line")
secondLineModeInput = input.string(title="Color Mode", defval="Default", options=["Default", "Candles"], group="Secondary Line")
secondLineColorDefaultInput = input.color(color.new(color.silver, 30), "Default", group="Secondary Line")
secondLineColorRisingInput = input.color(color.new(#089981, 50), "Candles Rising", group="Secondary Line")
secondLineColorFallingInput = input.color(color.new(#f23645, 50), "Candles Falling", group="Secondary Line")
secondLineStyleInput = input.string(title="Style", defval="Dashed", options=["Dotted", "Dashed", "Solid"], group="Secondary Line")
secondLineThicknessInput = input.string(title="Thickness", defval="1", options=["1", "2", "3", "4"], group="Secondary Line")
secondLineLengthInput = input.int(title="Length (bars)", minval=0, maxval=500, defval=0, group="Secondary Line")
secondLineExtendLeftInput = input.bool(true, "Extend Left", group="Secondary Line")
secondLineExtendRightInput = input.bool(false, "Extend Right", group="Secondary Line")

// ─────────────────────────────────────────────────────────────
// SYNTHETIC MOVEMENT INPUTS
// ─────────────────────────────────────────────────────────────

enableSyntheticInput = input.bool(true, "Enable Synthetic Movement", group="Synthetic Movement")
subTickDivisor = input.int(100, "Sub-Tick Divisions", minval=2, maxval=1000, step=10, group="Synthetic Movement", tooltip="Splits each mintick into N micro-steps. e.g. mintick=0.01, divisions=100 → step=0.0001. Higher = smoother, slower catch-up.")
showDotInput = input.bool(false, "Show Dot", group="Synthetic Movement")
dotColorInput = input.color(color.black, "Dot Color", group="Synthetic Movement")
dotSizeInput = input.string("Tiny", "Dot Size", options=["Auto", "Tiny", "Small"], group="Synthetic Movement")

// ─────────────────────────────────────────────────────────────
// STYLE MAPPING (no `var` — must recalculate on input change)
// ─────────────────────────────────────────────────────────────

lineStyle = switch lineStyleInput
    "Solid"  => line.style_solid
    "Dotted" => line.style_dotted
    => line.style_dashed

lineThickness = switch lineThicknessInput
    "2" => 2
    "3" => 3
    "4" => 4
    => 1

lineExtension = lineExtendLeftInput and lineExtendRightInput ? extend.both : lineExtendLeftInput ? extend.left : lineExtendRightInput ? extend.right : extend.none

secondLineStyle = switch secondLineStyleInput
    "Solid"  => line.style_solid
    "Dotted" => line.style_dotted
    => line.style_dashed

secondLineThickness = switch secondLineThicknessInput
    "2" => 2
    "3" => 3
    "4" => 4
    => 1

secondLineExtension = secondLineExtendLeftInput and secondLineExtendRightInput ? extend.both : secondLineExtendLeftInput ? extend.left : secondLineExtendRightInput ? extend.right : extend.none

mainLength = math.max(lineLengthInput, 1)
secondLength = math.max(secondLineLengthInput, 1)

// ─────────────────────────────────────────────────────────────
// SYNTHETIC SMOOTH PRICE ENGINE
//
// Pure linear stepper: each realtime tick moves `price` by
// exactly (mintick × stepsPerTick) toward close.
//   e.g. mintick=0.01, stepsPerTick=1 →
//        100.00 → 100.01 → 100.02 → ... → 100.50
// ─────────────────────────────────────────────────────────────

varip float price = na

if na(price)
    price := close

stepSize = syminfo.mintick / subTickDivisor
targetPrice = close
delta = targetPrice - price
distance = math.abs(delta)

if barstate.islast and enableSyntheticInput
    if distance > stepSize
        price := delta > 0 ? price + stepSize : price - stepSize
    else
        price := targetPrice

if not enableSyntheticInput
    price := close

// ─────────────────────────────────────────────────────────────
// COLOR ENGINE
// ─────────────────────────────────────────────────────────────

lineColor = lineModeInput == "Candles" ? (price >= open ? lineColorRisingInput : lineColorFallingInput) : lineColorDefaultInput

secondLineColor = secondLineModeInput == "Candles" ? (price >= open ? secondLineColorRisingInput : secondLineColorFallingInput) : secondLineColorDefaultInput

// ─────────────────────────────────────────────────────────────
// MAIN PRICE LINE
// ─────────────────────────────────────────────────────────────

var line priceLine = na

if barstate.islast
    if na(priceLine)
        priceLine := line.new(x1=bar_index - mainLength, y1=price, x2=bar_index, y2=price, xloc=xloc.bar_index, extend=lineExtension, color=lineColor, style=lineStyle, width=lineThickness)
    else
        line.set_xy1(priceLine, bar_index - mainLength, price)
        line.set_xy2(priceLine, bar_index, price)
        line.set_color(priceLine, lineColor)
        line.set_style(priceLine, lineStyle)
        line.set_width(priceLine, lineThickness)
        line.set_extend(priceLine, lineExtension)

// ─────────────────────────────────────────────────────────────
// SECONDARY LINE
// ─────────────────────────────────────────────────────────────

var line secondPriceLine = na

if barstate.islast and secondLineShowInput
    if na(secondPriceLine)
        secondPriceLine := line.new(x1=bar_index - secondLength, y1=price, x2=bar_index, y2=price, xloc=xloc.bar_index, extend=secondLineExtension, color=secondLineColor, style=secondLineStyle, width=secondLineThickness)
    else
        line.set_xy1(secondPriceLine, bar_index - secondLength, price)
        line.set_xy2(secondPriceLine, bar_index, price)
        line.set_color(secondPriceLine, secondLineColor)
        line.set_style(secondPriceLine, secondLineStyle)
        line.set_width(secondPriceLine, secondLineThickness)
        line.set_extend(secondPriceLine, secondLineExtension)

// ─────────────────────────────────────────────────────────────
// OPTIONAL DOT (separate plotchar per size — `size` must be const)
// ─────────────────────────────────────────────────────────────

plotchar(showDotInput and dotSizeInput == "Auto" ? price : na, title="Price Dot Auto", location=location.absolute, char="•", color=dotColorInput, size=size.auto)
plotchar(showDotInput and dotSizeInput == "Tiny" ? price : na, title="Price Dot Tiny", location=location.absolute, char="•", color=dotColorInput, size=size.tiny)
plotchar(showDotInput and dotSizeInput == "Small" ? price : na, title="Price Dot Small", location=location.absolute, char="•", color=dotColorInput, size=size.small)

Overview

Colour can be fixed or follow rising and falling candles, and style, thickness, length and extension are adjustable. An optional synthetic movement mode splits each move into sub-tick steps so the line glides, and a dot can mark the end. Because it follows the live price, it changes on the open bar.

Live price line with a secondary line
Candle-based or fixed colouring
Synthetic sub-tick smoothing
Adjustable style, length and extension

Details

Published by

shubhamtaywade82 on GitHub

Code credit

nemesis, as written in the script's header

Type

Indicator, Pine Script v6

Draws

On the price chart

Markets

Any symbol

Timeframes

Any timeframe

Risk Notes

Signals can change on the live bar or after it closes (repainting)

File

indicators/utilities/synthetic-smooth-price-line.pine

Repository

github.com/shubhamtaywade82/pinescripts-collections. See its other scripts in the library

Settings

The inputs you can change from the gear icon on the chart. Defaults are the author's.

Setting	Type	Default	Variable
Color Mode	`string`	`Candles`	`lineModeInput`
Default	`color`	`color.silver`	`lineColorDefaultInput`
Candles Rising	`color`	`#089981`	`lineColorRisingInput`
Candles Falling	`color`	`#f23645`	`lineColorFallingInput`
Style	`string`	`Dotted`	`lineStyleInput`
Thickness	`string`	`1`	`lineThicknessInput`
Length (bars)	`int`	`150`	`lineLengthInput`
Extend Left	`bool`	`false`	`lineExtendLeftInput`
Extend Right	`bool`	`true`	`lineExtendRightInput`
Show Secondary Line	`bool`	`true`	`secondLineShowInput`
Color Mode	`string`	`Default`	`secondLineModeInput`
Default	`color`	`color.new(color.silver, 30)`	`secondLineColorDefaultInput`

Show all 24 settings

Setting	Type	Default	Variable
Candles Rising	`color`	`color.new(#089981, 50)`	`secondLineColorRisingInput`
Candles Falling	`color`	`color.new(#f23645, 50)`	`secondLineColorFallingInput`
Style	`string`	`Dashed`	`secondLineStyleInput`
Thickness	`string`	`1`	`secondLineThicknessInput`
Length (bars)	`int`	`0`	`secondLineLengthInput`
Extend Left	`bool`	`true`	`secondLineExtendLeftInput`
Extend Right	`bool`	`false`	`secondLineExtendRightInput`
Enable Synthetic Movement	`bool`	`true`	`enableSyntheticInput`
Sub-Tick Divisions	`int`	`100`	`subTickDivisor`
Show Dot	`bool`	`false`	`showDotInput`
Dot Color	`color`	`color.black`	`dotColorInput`
Dot Size	`string`	`Tiny`	`dotSizeInput`

Third-party code. ForexR did not write, test or endorse this script, and the summary above was generated automatically from its code and README. Indicators describe the past, and a strategy's backtest can look better than live trading, especially when a script repaints. Check it in the Strategy Tester and on a demo account before you rely on it.

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