Welcome to the forums.

There are a few basic rules that you should try to follow when posting in the forums. You broke a couple of them with your first post.

1. Post in the correct forum section. I have moved your topic from the ‘General Discussion’ to the indicator related ‘ProBuilder’ forum.
2. When posting code use the ‘Insert PRT Code’ button to make it more readable for others. I have tidied up your code.

To answer your question try this:

Variable1 = 0
MyOpen = Open[4]
MyClose = Close[0]
Result = ((MyClose-MyOpen)/MyOpen)*100

r = 128
g = 0
if result > 0 then
r = 0
g = 128
endif

Return Result coloured(r,g,0) style(line,1) as "Result", Variable1 as "0"

I may be a little confused by your request  now! I thought that you wanted the line to change colour from green to red but did you really mean that you wanted the infill colour to change? If so then this can sort of be achieved by hard coding but it is far easier and gives a much better results if you just add a colour zone via the indicator settings and then save these settings as default for the indicator so that every time you apply the indicator it is the same. Your original code should produce a black line.

If you remove the zero bits of code and add a separate ‘Horizontal Line’ indicator via the indicator settings then you might get rid of the “0” label – not certain so you need to test.