ATR Support Line

Overview
ATR Support Line is a higher-timeframe-aware overlay that builds a single dynamic support line by anchoring a smoothed price baseline and offsetting it with an Average True Range (ATR) multiple. It is designed to track constructive trends while adapting to current volatility. The tool can render using higher-timeframe (HTF) data with optional closed-bar confirmation to avoid repainting, or live interpolation for more responsive visuals.


Core logic (concepts, not implementation)
• Compute an anchor from price using a selectable moving-average family (SMA / EMA / ZLEMA).
• Measure volatility using ATR and apply a configurable multiplier.
• Form the support line by offsetting the anchor downward by the ATR multiple.
• Timeframe handling: either use the chart timeframe or request an explicit HTF for calculation.
• Rendering modes:
 – Closed-bar mode: interpolate inside the previous HTF bar for non-repainting behavior.
 – Live mode: interpolate inside the current HTF bar for more timely responsiveness (can visually “breathe” intrabar).

Inputs
• Anchor smoothing: MA type (SMA / EMA / ZLEMA) and anchor length.
• Volatility: ATR length and multiplier.
• Timeframe: optional calculation timeframe (HTF) distinct from the chart timeframe.
• Confirmation: toggle to use closed HTF values (non-repainting) vs. live interpolation.

How to read it
• Price holding above the ATR Support Line indicates constructive conditions; orderly pullbacks toward the line can be normal trend behavior.


• Persistent closes above the line indicate strength; reactions into the line often resolve higher in constructive regimes.


• Persistent closes below the line warn of deterioration; consider reducing risk until price reclaims the level.


• On HTF rendering with closed-bar confirmation, use closes on that HTF for signal confirmation.
• In live mode, treat intrabar pierces as potential noise until confirmed by the close.

Practical use cases
• Trend context: define a trailing “line in the sand” for long-bias frameworks.
• Risk framing: size down or tighten exposure when price loses the support line.
• Confluence: combine with structure (HH/HL vs. LH/LL), volume, or market-wide risk gauges.
• Multi-TF workflow: calculate on HTF for bias, execute on lower TFs for entries/exits.

Best practices
• Align confirmations with the timeframe used for calculation (especially in closed-bar mode).
• Pair with clear invalidation rules (e.g., daily/weekly closes below the line).
• Start with conservative multipliers on noisier assets; adjust ATR length/multiplier to match instrument volatility.

Technical notes
• Non-repainting option: closed-bar HTF mode finalizes values on HTF close; lower-TF plotting uses interpolation only for continuity (no look-ahead).
• Live option: interpolates within the current HTF bar for responsiveness; expect intrabar breathing.
• Works on any time-based chart; results are most interpretable on liquid instruments.

Who it is for
• Traders who want a single, disciplined, volatility-adjusted support line with HTF awareness.
• Systematic users who prefer clear, reproducible rules for trend context and risk boundaries.

Limitations & disclosures
• Closed-source; for educational and analytical use only.
• Not financial advice. Markets involve risk; past performance does not guarantee future results.

Release notes
• Added selectable anchor MA (SMA / EMA / ZLEMA) and explicit HTF calculation with two rendering modes (closed-bar non-repainting vs. live).
• Interpolation refined for smooth visuals while respecting HTF closes in confirmation mode.

Originality & why closed-source
This is not a reimplementation of public open-source scripts. The integration of anchor smoothing choices, volatility offset, HTF calculation, and dual rendering modes (closed-bar non-repainting vs. live interpolation) is designed to maintain trend fidelity with practical control over responsiveness. The interaction of these components is proprietary and the source is closed to protect the implementation.

Integration, not a mashup
ATR Support Line is a single, self-contained framework. It does not merely merge indicators; its components are purpose-built to produce one coherent, volatility-aware, single-line support with a clear reading protocol (hold above = constructive; loss = caution).

Indicator, not a strategy
This publication is an indicator overlay, not a trading strategy. It includes no backtests, position logic, performance claims, or risk assumptions. Use it as analytical context within your own risk management.

Comparison to common tools
Compared to static moving-average baselines or classic volatility bands, ATR Support Line emphasizes (1) a single actionable support level, (2) explicit volatility adjustment via ATR, and (3) HTF-aware rendering with an optional non-repainting confirmation mode.