Ability to change text colour using config.text_color

[PRU1]

Description of proposed feature

To change the background colour, config.background_color=COLOUR can be used. Adding support to change the text colour would be convenient when changing the background colour, and the default white text doesn't show well.

How can the new feature be used?

Maybe a command like config.text_color=COLOUR

Additional comments

[markromanmiller]

I see the need - it would be great to set the color of a type of Mobject exactly once in the code or stylesheet configuration.

However, the dev team has decided that config is not the right place for background_color and we want to deprecate it soon. There isn't yet a solidified plan for a "stylesheet" type interface, though I agree I'd like one.

Last time this came up on Discord, the two kinds of workarounds were subclassing Tex with different defaults or defining a partial function that modifies kwargs if a value is unset.

If you want to take on a larger project, feel free to suggest some alternatives and start developing one of them. I'd be happy to have stylesheets in Manim.

[cobordism]

One positive thing about setting so many attributes as keyword arguments is that you can easily make your own version of a mobject constructor with different defaults:

def myText(*args, color=PURPLE, **kwargs):
    return Text(*args, color=color, **kwargs)

and then use myText instead of Text in you scene.

[kilacoda-old]

One possibly better solution might be to add a new config property config.default_mobject_color which would replace the currently hardcoded color value of WHITE in Mobject.__init__:

manim/manim/mobject/mobject.py

Line 67 in dbb6212

def __init__(self, color=WHITE, name=None, dim=3, target=None, z_index=0, **kwargs):

[hydrobeam]

I think I'm a fan of the config.default_mobject_color idea, but should it also override all colours for mobjects? There are quite a few which have colourful defaults (RED for Circle). One way of doing it is to remove all default colours and have everything be WHITE / default_mobject_color