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Trend Fan Spectrum
Admin's Choice NewFreeTwenty-four slope-colored EMAs fused into one fan surface
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
- 6
- Plots
- 47
- Lines of code
- 76
- Source
- presets/analysis/gpu/trend_fan_spectrum.qs
About
Twenty-four EMAs on a geometric ladder of lengths (5 .. ~250) drawn as one fan. Every line is colored by its own slope in ATR units, so the fan shows at a glance which horizons are accelerating, which are rolling over and where the turn is travelling. Neighbouring lines are filled, so the fan reads as one surface that opens in trends and folds in ranges. Alignment (the share of lines stacked in trend order) colors the candles; marks show the bars where the whole fan becomes aligned, and the dashboard reports alignment, fan width and the fastest / slowest slopes.
What it draws
Price overlay · counted from the engine's plot table and the script's draw calls
Series
- Line24 visible · 23 helperEMA 1EMA 2EMA 3EMA 4EMA 5EMA 6EMA 7EMA 8EMA 9EMA 10+14 more
- Band fills (render.band calls)1
Signal marks
Drawings and chart effects
- Dashboard tables1 created
- Candle colors
How it runs
From source to the live chart, for this script
- 1Compile
The QuaScript compiler checks the 76-line script (64 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 one loop (1 for). 1
persistvariable keeps state (objects, counters) across bars. - 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
6 settings in 3 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.
- • 47 plotted series
- • 1 band fill call
- • 3 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)
- • candle colors (QuaScript layer)
Alerts
2 alert rules declared with alert.rule
All 24 EMAs are stacked in bullish order
All 24 EMAs are stacked in bearish order
Settings
6 settings, grouped as in the chart's settings dialog
| Setting | Type | Default | Range / options | Id |
|---|---|---|---|---|
| Source | Price source | close | — | source |
| Setting | Type | Default | Range / options | Id |
|---|---|---|---|---|
| Shortest length | Integer | 5 | 2 – 50 | shortest_length |
| Length ratio | Number | 1.185 | 1.05 – 1.5, step 0.005 | length_ratio |
| ATR length | Integer | 21 | 5 – 200 | atr_length |
| Setting | Type | Default | Range / options | Id |
|---|---|---|---|---|
| Color candles | Toggle | 1 | — | color_candles |
| Fill the fan | Toggle | 1 | — | fill_the_fan |
Script
packages/quascript/presets/analysis/gpu/trend_fan_spectrum.qs
Header
analysis "Trend Fan Spectrum" {
overlay = true
render = webgpu
max_objects = 100
}- Total lines
- 76
- Code lines
- 64
- Comment lines
- 8
- Helper functions
- 0
- Loops
- 1
- Persistent variables
- 1
- Higher-interval feeds
- 0
- Engine plots
- 47
Built with
ta.atrta.emamath.absmath.clampmath.maxmath.powmath.round
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