Hi. Not as far as I know.

One of the reasons is: what theme should be used as default dark theme?

You can still use !theme <theme-name> to select your theme inside your plantuml code or use e.g. the PLANTUML_CONFIG_FILE environment variable to render all diagrams with a special theme by default.

With the second option you could also build something similar like /dpng using Nginx and two plantuml-server docker container. But maybe not the best idea 😅.

Here is a webpage with examples about different plantuml themes:
https://the-lum.github.io/puml-themes-gallery/

Hi all,

@HeinrichAD:

One of the reasons is: what theme should be used as default dark theme?

FYI here are some element about dark mode:

• http://alphadoc.plantuml.com/doc/markdown/en/dark-mode

Then a new question will be:

• How to propagate the -darkmode flag to the plantuml-server?

If that can help the topic,
Regards,
Th.

@The-Lum nice catch. Thank you.

Edit: In this case as a quick fix one could probably use the PLANTUML_PROPERTY_FILE environment variable. But you would force the complete server to always use the dark mode flag.

• How to propagate the -darkmode flag to the plantuml-server?

Maybe I did not get the point, but to generate an image in "Dark Mode", you have to use the appropriate FileFormatOption.
Using .withColorMapper(ColorMapper.DARK_MODE)) method will switch you to Dark Mode.

For example, if you want to generate some PNG image, you will have:
new FileFormatOption(FileFormat.PNG).withColorMapper(ColorMapper.DARK_MODE))

So you just have to see if the requested URL starts by /dsvg/ or /dpng/ and if it's the case, call this .withColorMapper(ColorMapper.DARK_MODE)) method.

Concerning the theme, as @The-Lum said, you have to use @media (prefers-color-scheme:dark) in the theme definition, but that's only working for style, not for skinparam.

Hope this help!

@binge6 Do you mind describing exactly what you need?
The official server has a button "dark mode" that switches to /duml, and then the links become /dsvg and /dpng.

I don't know what /dsvg and /dpng is on dark mode (but I know svg and png files are),

the thing I did to get dark mode is just getting Dark Reader a web browser extension or addon that I use on firefox, due to plantuml-server just runs on a browser by running mvn jetty:run then going to firefox, it looks like this with Dark Reader

@binge6 @HeinrichAD @The-Lum I really don't understand what is the problem. It works on the official server:

• light mode:
  • editor: https://www.plantuml.com/plantuml/uml/SyfFKj2rKt3CoKnELR1Io4ZDoSa70000
  • png: https://www.plantuml.com/plantuml/png/SoWkIImgAStDuNBAJrBGjLDmpCbCJbMmKiX8pSd9vt98pKi1IW80
• dark mode
  • editor: https://www.plantuml.com/plantuml/duml/SoWkIImgAStDuNBAJrBGjLDmpCbCJbMmKiX8pSd9vt98pKi1IW80
  • png: https://www.plantuml.com/plantuml/dpng/SoWkIImgAStDuNBAJrBGjLDmpCbCJbMmKiX8pSd9vt98pKi1IW80
  • svg: https://www.plantuml.com/plantuml/dsvg/SoWkIImgAStDuNBAJrBGjLDmpCbCJbMmKiX8pSd9vt98pKi1IW80

Only ASCII doesn't produce a dark mode image

As far as I know, the official server is close source and not this project which is open source and community driven.

So, if a dark theme support is desired, somebody would need to add this feature. In general, it should not be that much work.

@VladimirAlexiev , sorry about that, HAHAHA, dark mode really does exist, just tried it, works fine