non-dynamic textfont color when using continuous color scales

[jarvas24]

Current Behavior (plotly version 4.14.3)

When using the text property in a bar trace with a continuous color scale, the textfont.color is static; all bars use the same text color, which results in difficult to read text for some bars (far right bar in screenshot).

import plotly.express as px
x = list(range(1, 10))
px.bar(x=x, y=x, color=x, text=[str(i) for i in x])

Expected/Desired Behavior

The text font color should be dynamic (dark text on light colored bars, light text on dark bars), just like the hover text. Bar traces with discrete colorscales already have this behavior:

import plotly.express as px
x = list(range(1, 10))
px.bar(x=x, y=x, color=[str(i) for i in x], text=[str(i) for i in x], color_discrete_sequence=px.colors.sequential.Plasma)

[ArkaprabhaChakraborty]

Is anyone working on this? If not then I want to work on this.

[nicolaskruchten]

No one is working on it as far as I know, and we'd love the help! The right place to solve this is in the underlying Javascript library Plotly.js. We've actually got code that does this for pie charts and treemaps I believe, so it may be quite straightforward to port it to bars :)

@archmoj or @alexcjohnson can advise.

[nicolaskruchten]

Looks like this is getting fixed in https://github.com/plotly/plotly.js/pull/5666 actually :)