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Feature Request: Support stacked columns in custom studies #426

@fishhotter

Description

@fishhotter

Hello TradingView team,

I'm using the Charting Library with custom studies.
Currently, when defining plots with StudyPlotType.Columns, each series is drawn independently. However, there is no way to render them as stacked columns (where multiple plots at the same time point can be visually stacked on top of each other).

Example use case:

I want to show USDT change and USDC change separately, but also stack them together at the same time point (similar to how stacked bar charts work).

Right now, the only workaround is to sum the values and display one combined column, but then the tooltip/crosshair shows only the total value, and I cannot toggle visibility of individual series (visible flag in styles) properly.

Problem:

No native support for stacked columns in StudyPlotType.Columns.

Cannot control how tooltips / crosshair values are displayed when stacking manually.

Visibility toggling (styles.visible) does not work correctly when plots are "manually summed".

Request:

Add support for stacked columns in custom studies.

Or provide a way for custom studies to define how multiple plots at the same time point should be drawn (e.g., stacked vs grouped vs overlapping).

This feature would be very useful for financial indicators where different categories of flows (e.g., stablecoins, futures, etc.) need to be shown together.

Thanks a lot for considering! 🙏

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