# Auto Trend Drawing

Draws the trend the way a trader would sketch it: ATR-normalized price is simplified with the Ramer-Douglas-Peucker algorithm and the surviving pivots are joined by a smooth Catmull-Rom spline. The result is a flowing, hand-drawn-style curve of market structure. A repainting, retrospective tool for bias and structure analysis.

- Indicator in the LuxAlgo Library, by LuxAlgo, published Feb 17, 2026.
- Access: free.
- Concepts: [Trendline](https://www.luxalgo.com/library/concept/trendline/) (primary)
- Open on Vela: https://vela.luxalgo.com/chart?pineScriptCodeId=cmpwn0bqy000ivhsgot76l60t
- Page: https://www.luxalgo.com/library/indicator/auto-trend-drawing/

**Auto Trend Drawing** sketches trend structure the way a trader would by hand: it isolates the structurally important pivots in a recent window and joins them with a smooth spline, producing a flowing curve of the dominant direction. Where a classic [trendline](https://www.luxalgo.com/library/concept/trendline/) is a straight edge between two swings, this curve keeps adapting to fresh data: it recalculates retrospectively and is subject to repainting by design.

## How to Trade the Auto Trend Drawing?

- **Upward slope, price above**: buyers own the structure; pullbacks toward the curve can behave as dynamic support.
- **Downward slope, price below**: sellers are in control; rallies into the curve often act as dynamic resistance.
- **Flattening curve**: compression and fading directional momentum, the environment that frequently precedes breakouts.
- **Structural break**: price decisively crossing and holding beyond the curve while its slope turns is the reversal tell.

Under the hood, prices are ATR-normalized so behavior stays consistent across instruments and timeframes, the Ramer-Douglas-Peucker pass strips insignificant points while preserving major swing highs and lows, and Catmull-Rom spline interpolation connects the surviving anchors. Given the retrospective recalculation, treat it as one of the library's [trend tools](https://www.luxalgo.com/library/family/trend/) for structure and bias rather than a real-time entry trigger.

## Auto Trend Drawing Settings

- **Window Size**: how many recent bars are analyzed; larger captures macro structure, smaller hugs short-term behavior.
- **Simplification Multiplier**: filtering aggression. Higher for smoother macro shape, lower for a tighter, more reactive curve.
- **ATR Length**: period used for the volatility normalization.
- **Curve Tension**: how tightly the spline bends between anchors; 0.5 gives balanced centripetal curvature.
- **Curve Resolution**: calculated sub-points between anchors for a smoother line; color and width handle styling.

## Frequently Asked Questions

### Does the Auto Trend Drawing repaint?

Yes, deliberately. The curve is displayed retrospectively from the most recent data and recalculates as bars arrive, which is why it is best used for structural analysis, bias confirmation, and research rather than strict signals.

### How does it compare to breakout-style trendline tools?

Pivot-anchored straight lines, like those in [Trendlines with Breaks](https://www.luxalgo.com/library/indicator/trendlines-with-breaks/), give fixed levels to trade against. This tool trades that fixity for a continuously updated picture of trend flow.

### How can I get the Auto Trend Drawing indicator?

It is free in the LuxAlgo Library. It can also be launched into Quant, our coding agent, right from this page to explore window sizes across markets. You can also copy the source code from this page and run it anywhere Pine Script® runs.

## Related indicators

- [Trendlines Oscillator](https://www.luxalgo.com/library/indicator/trendlines-oscillator/) (Trendline): markdown at https://www.luxalgo.com/library/indicator/trendlines-oscillator.md
- [Trendlines with Breaks](https://www.luxalgo.com/library/indicator/trendlines-with-breaks/) (Trendline): markdown at https://www.luxalgo.com/library/indicator/trendlines-with-breaks.md
- [Trendline Breakout Navigator](https://www.luxalgo.com/library/indicator/trendline-breakout-navigator/) (Trendline): markdown at https://www.luxalgo.com/library/indicator/trendline-breakout-navigator.md
- [Trendlines with Breaks Oscillator](https://www.luxalgo.com/library/indicator/trendlines-with-breaks-oscillator/) (Trendline): markdown at https://www.luxalgo.com/library/indicator/trendlines-with-breaks-oscillator.md
- [Rolling Trendline](https://www.luxalgo.com/library/indicator/rolling-trendline/) (Trendline): markdown at https://www.luxalgo.com/library/indicator/rolling-trendline.md
- [Power Hour Trendlines](https://www.luxalgo.com/library/indicator/power-hour-trendlines/) (Trendline): markdown at https://www.luxalgo.com/library/indicator/power-hour-trendlines.md
- [Machine Learning Trendlines Cluster](https://www.luxalgo.com/library/indicator/machine-learning-trendlines-cluster/) (Trendline): markdown at https://www.luxalgo.com/library/indicator/machine-learning-trendlines-cluster.md
- [Parallel Pivot Lines](https://www.luxalgo.com/library/indicator/parallel-pivot-lines/) (Trendline): markdown at https://www.luxalgo.com/library/indicator/parallel-pivot-lines.md

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Source: https://www.luxalgo.com/library/indicator/auto-trend-drawing/ (LuxAlgo Library). Free to use with attribution: https://www.luxalgo.com/library/license/