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[FEATURE]: Allow annotations for scatterternary to reference ternary axes (a,b,c) instead of (x,y)

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Assessment

Difficulty
4/5
Estimated time
3-5 days
Newbie friendliness
48/100
Issue type
Feature
Clarity
Mostly clear
Activity status
Quiet
Tech stack
javascript
Domain
data-visualization

Research direction

Start by locating the scatterternary annotation handling and the annotation declaration path in plotly.js. Check how annotation positions currently use x and y, then determine how a, b, and c coordinates should be interpreted for this plot type. Done means annotations can accept ternary-axis positions without requiring cartesian conversion, with coverage for the requested example.

Written by the indexing model from the issue text.

Description

enhancement feature P2 size: 3

Hi,

Description

For scatterternary plots, it would great if we could specify the annotation positions relative to the a,b, c axes instead of x and y.

Why should this feature be added?

Currently, we have to convert the annotations a,b, c positions into (arbitrary for this plot type) cartesian coordinate space; it would be easier (and be more logical) to be able to use a,b, c in the annotation declaration, e.g:

annotations: [
  {
    //x: 0.1,
    //y: 0.135,
    a: 10,
    b: 70,
    c: 20,
    text: "my text"
  }
]

Many thanks

Dominant language
JavaScript
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Merged PRs (30d)
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