[Feature Request]: Improve color palettes

[tomtomme]

Still relevant with jasp 0.19.3

Description

• Show the actual colors of color palettes in the drop down - instead of names AND/OR edit the names of color palettes so that they mean something (like color blind, not like viridis)
• Add palettes for discrete vars
• add more palettes for continous vars
• let the user add custom color palettes
• Let the user edit the color of all kinds of plots without resorting to svg or pptx-export
• add global color palette option

Purpose

to see beforehand, what you are selecting & to have more appropriate palettes for heat maps etc.

Use-case

seeing the color in the drop down is better for non-technical users that do not know color palette names like ggplot2 or viridis; for heat maps a color palett from blue over white to red is often a good choice

Is your feature request related to a problem?

selecting the right palette is hard atm and they are not many

Is your feature request related to a JASP module?

All 4 descriptives modules

Context

• R-Package to include more palettes https://github.com/mtennekes/cols4all
• relevant 2023 paper on the new color palettes in R since 4.0 https://www.zeileis.org/news/coloring/

[tomtomme]

from vandenman:
However, the problem is a bit more complex than just one general option. Take for example this plot:

This color palette is meant for a discrete scale, but it's used as a gradient.

I think we need multiple color palettes. One palette for colors that represent discrete scales (e.g., 4 different lines or points with different colors example) and one palette for colors that represent continuous scales (e.g., a bivariate density plot example).

Usually, colors palettes meant for continuous scales work fine for discrete scales, but not the other way around.