support different color maps

[flashpixx]

Hello,

I'm dealing with a lot of different data sets. I'm using also Chart.js plugins e.g. boxplot.
A request is, that Chart.js can support different colormaps e.g. like Matlab
This can be helpful for stacked datasets or grouped datasets, so that an item of a group / stack will get a unique color. IMHO something like: colormap("jet", 5) returns 5 colors by the jet colormap.
Also a callback mechanism for generating such maps is very helpful

[flashpixx]

This project creates such maps

[simonbrunel]

How do you see that feature supported/integrated? Do you have some examples/codes of how you would like to use it with your charts?

[etimberg]

It's possible to convert those colour scales to a CanvasGradient and then it should render fine. I will see if I can find an example that uses gradients already

[flashpixx]

I don't have an example yet, but I used it for the borderLine and backgroundColor, so I get a more smooth color flow over my datasets.

[etimberg]

One plugin that auto creates gradients is https://github.com/bbc/Chart.bands.js which could be some inspiration.

This is a quick sample I created using a plugin to generate the gradient responsively so that resizing works correctly.

[etimberg]

Added a sample file showing how to create gradients and use them in #6666. Turning the color maps into gradients is not a core feature we will support