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QuaScript

Price-Volume Correlation Strip

NewFree

Does volume confirm price? Direction and participation correlation

WebGPU StudioOwn pane WebGPU CanvasHybridDashboardSignalsAlerts
quascriptgpuwebgpuvolumecorrelationheatmap

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Language
QuaScript
Engine
Native C++, incremental on live ticks
Rendering
WebGPU + Canvas
Placement
Own pane
Settings
3
Plots
26
Lines of code
56
Source
presets/analysis/gpu/price_volume_correlation.qs
Price-Volume Correlation Stripengine 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

Whether volume confirms price, on 12 windows. The bottom six rows correlate signed returns with volume (do up bars carry the volume?), the top six correlate the size of moves with volume (do big bars need big volume?). Diverging colours: emerald for positive correlation, rose for negative, dark for none. Reading: emerald at the bottom = buyers lead with volume (healthy advance); rose at the bottom = volume comes in on down bars (distribution); top rows going dark = moves happen without participation (thin, fragile trend). Signals: confirmation breaks and participation returning. Method: rolling Pearson correlation of log returns and log volume.

26
Plotted series
3
Signal marks
1
Drawings
1
Alert rules
3
Settings
47
Lines of code

What it draws

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

Series

  • Line1 visible · 25 helper
    Confirmation balance
  • Band fills (render.band calls)2
Legend
Confirmation balance

Signal marks

DistributionNo participationParticipation returning

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 56-line script (47 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 = 0.26 (26% 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). 1 persist variable keeps 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

    3 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

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
  • • 26 plotted series
  • • 2 band fill calls
  • • 3 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

Volume on down bars

Signed return-volume correlation turned negative

Settings

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

Strip
SettingTypeDefaultRange / optionsId
Shortest windowInteger2010 – 500shortest_window
Window stepInteger205 – 200window_step
Signals
SettingTypeDefaultRange / optionsId
Break thresholdNumber0.250.05 – 0.8, step 0.05break_threshold

Script

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

Header

analysis "Price-Volume Correlation Strip" {
    pane = hpane
    height = 0.26
    render = webgpu
    short_title = PVC
    precision = 2
}
Total lines
56
Code lines
47
Comment lines
8
Helper functions
0
Loops
2
Persistent variables
1
Higher-interval feeds
0
Engine plots
26

Built with

Statistics (stat.*)
stat.corr
Math (math.*)
math.absmath.clampmath.coalescemath.logmath.max
Imported modules
viz/premium

Discussion

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