abcdPattern

The ABCD Pattern is one of the simplest harmonic formations, built from four swing points (A, B, C, D). It helps traders identify measured moves: AB and CD legs often mirror each other in length and time. This makes it a practical tool for spotting potential reversals or continuations.

Syntax

abcdPattern(pointA, pointB, pointC, pointD, styles?)

Parameters

pointA (PricedData) · First anchor, starting the pattern. pointB (PricedData) · Second anchor, completing the AB leg. pointC (PricedData) · Third anchor, completing the BC leg. pointD (PricedData) · Fourth anchor, final point and completion zone. styles (ABCDPatternStyleOverrides) · Visual and label options:

• fillBackground (boolean) · Fill the inside of the shape.

• transparency (number) · Background transparency (0–100).

• showLabels (boolean) · Display labels (A, B, C, D).

• line (LinesLevels without coeff) · Line style (linestyle, linewidth, color).

• background (RGBAColor | BaseColors) · Color for filled area.

Return Value

(string) · The drawing ID of the created ABCD Pattern.

Example

Every 60 candles, we draw an ABCD pattern connecting four recent pivots.

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

onTick = () => {
  if (index % 60 === 0) { // draw every 60 bars
    // 1) Choose four anchors
    const A = newPoint(time(90), low(90));
    const B = newPoint(time(70), high(70));
    const C = newPoint(time(45), low(45));
    const D = newPoint(time(20), high(20));

    // 2) Define style
    const style = {
      fillBackground: true,
      transparency: 80,
      showLabels: true,
      line: { linestyle: 0, linewidth: 2, color: color.blue },
      background: color.rgba(0, 128, 255, 0.2)
    };

    // 3) Draw ABCD Pattern
    abcdPattern(A, B, C, D, style);
  }
};

Tips

• The CD leg often mirrors AB in length/time. Watch for symmetry to validate the pattern.

• Works well as both a continuation (trend resumes after correction) and a reversal (market shifts direction).

• Combine with Fibonacci: AB retrace to C often lands at 0.618, and CD often extends 1.272 or 1.618.

Warning

• Don’t force uneven swings into an ABCD — if legs are wildly out of proportion, it isn’t valid.

Good Practice

• Keep a consistent const style so your harmonic patterns are visually distinct but not cluttered.

• Use the ABCD as a base structure: many advanced harmonic patterns (like Gartley or Bat) are built from an ABCD inside.