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QuaScript

Spectral Power Waterfall

Admin's Choice NewFree

Cycle power at 24 periods: dominant cycle, cycle lock and loss

WebGPU StudioOwn pane WebGPU CanvasHybridDashboardSignalsAlerts
quascriptgpuwebgpucyclesspectrumheatmap

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
Own pane
Settings
6
Plots
50
Lines of code
64
Source
presets/analysis/gpu/spectral_waterfall.qs
Spectral Power Waterfallengine 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

Cycle power at 24 cycle lengths on every bar, as a waterfall heatmap. Each row is the share of spectral power at one period (6 .. 52 bars) relative to the strongest period of that bar, from a complex demodulation of detrended price, so a bright row is a cycle the market is repeating. Reading: one bright row = a clean dominant cycle (time entries with its troughs); power spread over many rows = no cycle (trend or noise days); a bright band drifting up or down = the cycle is lengthening or shortening. The white trace marks the dominant period. Signals: "Cycle lock" when one period holds more than the lock share of power, "Cycle lost" when it drops away. Method: complex demodulation (Bloomfield, 1976): price times a unit phasor of each period, smoothed over the window.

50
Plotted series
2
Signal marks
1
Drawings
1
Alert rules
6
Settings
54
Lines of code

What it draws

Own pane · counted from the engine's plot table and the script's draw calls

Series

  • Line1 visible · 49 helper
    Dominant period
  • Band fills (render.band calls)1
Legend
Dominant period

Signal marks

Cycle lockCycle lost

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 64-line script (54 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 pane = hpane with height = 0.32 (32% of the chart), so the output gets its own pane under the price with its own scale.

  3. 3
    Compute

    The script runs once per bar, oldest to newest. Each bar also runs 2 loops (2 for). 2 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 WebGPU, drawings on the Canvas 2D QuaScript layer.

  6. 6
    Tune

    6 settings in 4 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

WebGPUSeries renderer

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.

In this script
  • • 50 plotted series
  • • 1 band fill call
  • • 2 signal mark types

Chosen by render = webgpu in the header.

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.

CanvasUsed

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
  • • 1 dashboard tables (QuaScript layer)

Alerts

1 alert rule declared with alert.rule

Cycle lock

One cycle length now dominates the spectrum

Settings

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

General
SettingTypeDefaultRange / optionsId
SourcePrice sourceclose—source
Spectrum
SettingTypeDefaultRange / optionsId
Smoothing barsInteger6416 – 400smoothing_bars
Shortest periodInteger64 – 40shortest_period
Period stepInteger21 – 10period_step
Signals
SettingTypeDefaultRange / optionsId
Lock shareNumber0.120.05 – 0.5, step 0.01lock_share
Style
SettingTypeDefaultRange / optionsId
PaletteChoicemagmamagma, inferno, viridis, turbo, plasmapalette

Script

packages/quascript/presets/analysis/gpu/spectral_waterfall.qs

Header

analysis "Spectral Power Waterfall" {
    pane = hpane
    height = 0.32
    render = webgpu
    short_title = SPW
    precision = 1
}
Total lines
64
Code lines
54
Comment lines
9
Helper functions
0
Loops
2
Persistent variables
2
Higher-interval feeds
0
Engine plots
50

Built with

Technical analysis (ta.*)
ta.emata.sma
Math (math.*)
math.coalescemath.cosmath.powmath.sin
Imported modules
viz/premium

Discussion

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