extendedLine

Draw a line that goes through two chosen points and extends infinitely in both directions. This is handy when you want to see a complete trend extension that keeps going left and right, rather than stopping at your selected candles.

Syntax

extendedLine(fromPoint, toPoint, styles?, text?)

Parameters

• fromPoint: First anchor point on the chart. Use newPoint(time, price).

• toPoint: Second anchor point. The line will pass through this point too.

• styles (optional) Control how the line looks:

  • linecolor: color of the line (e.g. color.red)

  • linewidth: thickness of the line

  • linestyle: solid, dashed, dotted, etc.

  • showLabel: show or hide the label

  • textcolor: label text color

• text (optional): A short label to display on the line (if showLabel: true).

Return Value

• string — A unique id for the drawing. Use it with updateDrawingById(id, data) or deleteDrawingById(id).

Example

Here’s how to draw a red extended line through the highs of the last 5 and last 0 candles:

//@version=1
init = () => {
  // Overlay on main chart
  indicator({ onMainPanel: true, format: 'inherit' });
};

onTick = () => {
  if (index %60 === 0) {
    const p1 = newPoint(time(5), high(5));  // high from 5 candles ago
    const p2 = newPoint(time(0), high(0));  // current candle high

    extendedLine(
      p1,
      p2,
      { linecolor: color.red, linewidth: 2, showLabel: true },
      'Extended Line'
    );
  }
};

This will draw one red line passing through the two highs and continuing both left and right across the chart, with a small label “Extended Line.”

Result

Tips

• Extended lines are great for projecting old support/resistance across the entire chart.

• Use them sparingly so your chart doesn’t become full of crossing lines.

Warning

• If you pass invalid points (missing time or price), the line won’t appear.

• If you give text but don’t enable showLabel: true, the label won’t show.

Good Practice

• Choose contrasting but calm colors (like gray or light blue) for extended lines, so they help without overwhelming the chart.

• Use highs for resistance lines and lows for support lines — this makes them intuitive to read.