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QuaScript

Trend Prism Follower

NewFree

Trades only unanimous, clean regression trends

StrategiesPrice overlay CanvasDashboardSignals
quascriptstrategiesstrategyregressiontrendr-squared

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Language
QuaScript
Engine
Native C++, incremental on live ticks
Rendering
Canvas
Placement
Price overlay
Settings
4
Plots
18
Lines of code
85
Source
presets/strategy/trend_prism_follower.qs
Trend Prism Followerengine result
Loading the engine result…
quatick-charts · QuaScript engine on synthetic 1-minute bars · drag to pan · scroll to zoom · Run executes the script on the engine (⌘/Ctrl+Enter while editing)

About

Follows trends only while they are both unanimous and clean. Eight linear regressions from `base` to eight times `base` bars vote on direction with their slopes, and their mean R squared measures how straight the trend is. A position opens when every slope agrees and the fits are clean, and closes as soon as quality decays or the shortest fits turn against it, so the system sits out the noisy middle of ranges where trend followers lose most. Entry: all eight slopes up (down) and mean R squared above `q_in`. Exit: mean R squared below `q_out`, the two shortest slopes turning against the position, or a stop `stop_k` ATR beyond the longest regression (trailed, never loosened). Risk: 1 % per trade at the initial stop.

18
Plotted series
2
Signal marks
1
Drawings
0
Alert rules
4
Settings
76
Lines of code

What it draws

Price overlay · counted from the engine's plot table and the script's draw calls

Series

  • Line0 visible · 17 helper
  • Step line1
    Trailing stop
  • Band fills (render.band calls)1
Legend
Trailing stop

Signal marks

Long entryShort entry

Drawings and chart effects

  • Dashboard tables1 created

How it runs

From source to the live chart, for this script

  1. 1
    Compile

    The QuaScript compiler checks the 85-line script (76 lines of code) and lowers it for the native C++ engine. Compile errors point at the exact line and column.

  2. 2
    Place

    The header sets overlay = true, so everything is drawn on the price chart, on the same scale as the candles.

  3. 3
    Compute

    The script runs once per bar, oldest to newest. Each bar also runs one loop (1 for). 3 persist variables keep state (objects, counters) across bars.

  4. 4
    Stay 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.

  5. 5
    Render

    The results are handed to the chart: series on Canvas.

  6. 6
    Tune

    4 settings in 3 groups appear in the chart's settings dialog. Changing one reruns the engine with the new value.

Rendering

This script draws on Canvas

WebGPUNot used

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.

WebGLNot used

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.

CanvasSeries renderer

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.

In this script
  • • 18 plotted series
  • • 1 band fill call
  • • 2 signal mark types
  • • 1 dashboard tables (QuaScript layer)

Settings

4 settings, grouped as in the chart's settings dialog

Prism
SettingTypeDefaultRange / optionsId
Shortest windowInteger124 – 200shortest_window
Signals
SettingTypeDefaultRange / optionsId
Entry quality (R squared)Number0.60.1 – 0.95, step 0.05entry_quality_r_squared
Exit quality (R squared)Number0.350.05 – 0.9, step 0.05exit_quality_r_squared
Risk
SettingTypeDefaultRange / optionsId
Stop beyond long fit (ATR)Number1.50.2 – 6, step 0.1stop_beyond_long_fit_atr

Script

packages/quascript/presets/strategy/trend_prism_follower.qs

Header

strategy "Trend Prism Follower" {
    overlay = true
    capital = 100000
    commission = 0.05
    slippage = 1
    sizing = risk_percent
    max_leverage = 1
    size = 1
    pyramiding = 1
}
Total lines
85
Code lines
76
Comment lines
8
Helper functions
0
Loops
1
Persistent variables
3
Higher-interval feeds
0
Engine plots
18

Built with

Technical analysis (ta.*)
ta.atr
Statistics (stat.*)
stat.linregstat.r_squared
Math (math.*)
math.coalescemath.maxmath.min
Imported modules
viz/premium

Discussion

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