Added graphical options

[gauner666]

Added Transparency for unused lines (path)
Added Grey out option for unused lines (path)

[flixlix]

Thank you very much for your PR, on first glance it looks nice.

I'll review it with more detail later today

[gauner666]

Great, please feel free to adopt and improve the code whereever / whenever you want :)

[flixlix]

Thank you once again for the PR, really liked the idea and clean implementation!

The first thing I noticed is that, by default the "zero lines" were greyed out. I would like to have this option, but by default the card should still resemble the behavior of the HA Energy Distribution Card, so I changed this to being an "opt in" option.

I also found a few weird issues between the showLine and styleLine functions, they should be fixed now.

(I read your comment in the HA Community page: Feel free to open another PR to fix the display_zero_tolerance discrepancies, I would honestly just set the states to 0 if they're below the tolerance, and not rely on the showLine and styleLines functions to be able to distinguish a 0 value and a value below tolerance. The functions should be as dumb as possible. I think this PR should not address this issue. 👍)

When seeing the greyout functionality, I thought that people might want to be able to customize this color to fit with their themes, so I decided to make this color configurable.

I also changed how this is configured in the YAML, so it will lead to some breaking changes regarding the display_zero_lines, but I think it is more organized this way.

I noticed that with you configuration it is possible to grey out as well as set the opacity to that grey color.
At first I though, I wanted to display this differently in the UI Editor, but had to get creative to be able to still have this functionality:

Bildschirmaufnahme.2023-06-15.um.18.56.28.mov

Hopefully you like this implementation.
If you don't mind, I'll just shamelessly push the changes onto your branch 😅
Feel free to test these changes and give me some feedback!

[gauner666]

Very very nice. I like the way you improved my thoughts - I see your passion in this project.
I tested the code and everything is working as expected. Great!
I think you can go live with this code :)
About the 'display_zero_tolerance discrepancies' -> I'm facing a busy day tomorrow so if you find time you don't have to wait for my PR!
Wish you a nice evening!