How to animate the text to gradually change in colour?

[texi]

Is there a way to make the text gradually change in colour? I want to use this to indicate character health in combat.

[xavimat]

You can't change gradually the color in front of the player, but you can have the color of the text checked every time that text is shown to the player.

I guess it's tricky.
Do you need the change on the normal text that the character says, or in a screen that you have made?
You need to go to the screen that have that text and "color" that text with some variable that you change somewhere, according the health.

A simply (and ugly) example:

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default health = 255
label start:
    "Hello, world."
    $ health -= 60
    e "You've created a new Ren'Py game."
    $ health -= 60
    e "Once you add a story, pictures, and music, you can release it to the world!"
    return

In the file "screens.rpy", look for the screen "say":

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screen say(who, what):

And change the line

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        text what id "what"

with:

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        text what id "what" color (255, health, health)

Every time the health changes, the color of the next text will tend to "red".
In this example, every character will be affected. You need an "if" statement inside the screen to avoid that.

[Remix]

The Ren'py Color object supports a lot of colour mangling options

Example with interpolate...

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default colour_base = "#FF0000"
default colour_top = "#00FF00"
default colour_refs = [0.0, 0.01]

screen colour_test():
    python:
        colour_refs[1] = colour_refs[1] if 0.0 <= colour_refs[0] <= 1.0 else 0 - colour_refs[1]
        colour_refs[0] += colour_refs[1]
        ref_colour = Color( colour_base )
        #
        # this basically takes our ref_colour object ( with colour_base ) and pushes 
        # it toward the colour_top using a floating point fraction (0.0 to 1.0) to 
        # determine the final used colour
        #
        used_colour = ref_colour.interpolate( colour_top, colour_refs[0] )
    text "{0}%".format(round(colour_refs[0]*100)) color used_colour
    timer 0.1 action (renpy.restart_interaction) repeat True

label start:
    show screen colour_test
    "First Line"

[texi]

I'm trying to change the colour of the name of the character.