I'm currently making a conversion of a board game I have - I don't intend to release it, it's merely to sharpen up skills. I'm currently refactoring it to completely separate game logic from everything such as rendering, getting user input, etc. The game logic is now in a library independent of the project that is actually run.
However, I've come across the problem that, if I don't store piece positions in the game state (as the game logic does not need to know about these), I'm struggling to think of how to store this information in the project that deals with rendering/user input stuff, so that it may render pieces.
The game state looks like this within the game logic - each district used to have a Vector2 indicating where the trouble marker would be displayed, and each piece would also have a Vector2 indicating their position on the board. They do not at the moment, as I wish to only have such things in the game project, as opposed to the logic project
Environment City District District Trouble Piece(s)
I have thought of creating a clone of this structure but adding position information, or of trying to use inheritance. But both of these methods seem extremely painful to do in the situation, and I'd really prefer to keep the game logic completely unknowing of things like this.
How would I go about doing this cleanly? Is it possible, or do I need to do a complete rethink of things?