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Auto Trendlines
Admin's Choice NewFreeSwing-validated trendlines with touch counts and break signals
Favourites and Admin's Choice analyses are listed in the terminal's indicators window under Analysis Marketplace.
- Language
- QuaScript
- Engine
- Native C++, incremental on live ticks
- Rendering
- WebGPU + Canvas
- Placement
- Price overlay
- Settings
- 7
- Plots
- 2
- Lines of code
- 185
- Source
- presets/analysis/levels/auto_trendlines.qs
About
Detects and draws trendlines automatically. Every confirmed swing high is tested against the previous swing highs (and every swing low against the previous lows): a candidate line is kept only if no bar closed through it between its anchors and since, and if enough swings touch it within the tolerance. The line with the most touches wins, so lines are structural, not every pair of pivots. Lines extend to the right until price closes through them by more than the tolerance; a broken line stops at the break, turns dashed and is labelled. Reading: falling resistance (rose) and rising support (emerald) frame the trend; three or more touches make a line significant; a break with a close beyond tolerance is the signal, a retest of the broken line from the other side is the classic entry. Signals: trendline breakouts and breakdowns, with alerts.
What it draws
Price overlay · counted from the engine's plot table and the script's draw calls
Series
- Line2Nearest resistanceNearest support
Signal marks
Drawings and chart effects
- Dashboard tables1 created
- Tags1 created
- Segments2 created
How it runs
From source to the live chart, for this script
- 1Compile
The QuaScript compiler checks the 185-line script (164 lines of code) and lowers it for the native C++ engine. Compile errors point at the exact line and column.
- 2Place
The header sets
overlay = true, so everything is drawn on the price chart, on the same scale as the candles. - 3Compute
The script runs once per bar, oldest to newest. Each bar also runs 7 loops (7 for). 6
persistvariables keep state (objects, counters) across bars. Helper functions:best_line(),add_line(). - 4Stay live
On the terminal the script keeps one live engine session: a tick rolls the forming bar back to its checkpoint and re-executes only that bar, and new bars are appended, so history is never rerun while the market moves. The live result is identical to a full run.
- 5Render
The results are handed to the chart: series on WebGPU, drawings on the Canvas 2D QuaScript layer.
- 6Tune
7 settings in 2 groups appear in the chart's settings dialog. Changing one reruns the engine with the new value.
Rendering
Hybrid: this script draws on 2 surfaces at once
The browser's modern GPU API. The chart uploads every line, band and mark of the script as GPU buffers and draws them in one pass, so dense heatmaps and dozens of series stay smooth while you pan and zoom. Without WebGPU support the chart's GPU layer falls back to WebGL 2, then Canvas 2D.
- • 2 plotted series
- • 2 signal mark types
Chosen by render = webgpu in the header.
GPU drawing through WebGL 2, available in every current browser. Used for chart-native profiles and for series that ask for it with backend = "webgl". Fast for large numbers of bars and wide fills.
The browser's 2D drawing API. Text-heavy and object-style output (dashboard tables, zones, tags, segments), candle colors and backgrounds are painted by the QuaScript layer, a Canvas 2D surface over the chart. Series use Canvas when the script's header does not ask for a GPU.
- • 1 dashboard tables (QuaScript layer)
- • 1 tags (QuaScript layer)
- • 2 segments (QuaScript layer)
Alerts
2 alert rules declared with alert.rule
Price closed above a validated resistance trendline
Price closed below a validated support trendline
Settings
7 settings, grouped as in the chart's settings dialog
| Setting | Type | Default | Range / options | Id |
|---|---|---|---|---|
| Swing bars left | Integer | 8 | 2 – 50 | swing_bars_left |
| Swing bars right | Integer | 4 | 1 – 30 | swing_bars_right |
| Setting | Type | Default | Range / options | Id |
|---|---|---|---|---|
| Swings compared | Integer | 6 | 2 – 20 | swings_compared |
| Minimum touches | Integer | 3 | 2 – 8 | minimum_touches |
| Tolerance (ATR) | Number | 0.3 | 0.05 – 2, step 0.05 | tolerance_atr |
| Lines kept per side | Integer | 3 | 1 – 10 | lines_kept_per_side |
| Longest line (bars) | Integer | 400 | 50 – 3000 | longest_line_bars |
Script
packages/quascript/presets/analysis/levels/auto_trendlines.qs
Header
analysis "Auto Trendlines" {
overlay = true
render = webgpu
short_title = ATL
max_objects = 120
}- Total lines
- 185
- Code lines
- 164
- Comment lines
- 14
- Helper functions
- 2
- Loops
- 7
- Persistent variables
- 6
- Higher-interval feeds
- 0
- Engine plots
- 2
Built with
ta.atrta.pivot_highta.pivot_lowlist.createlist.getlist.pushlist.removelist.setlist.shiftlist.sizemath.absmath.is_naviz/premium
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