ding-algorithm | determinant parameterization of precipitation types | Learning library

I am currently working on a pathfinding-visualizer-app and i am a bit overwhelmed by using a completely new programming language (at least for me).

But i think it is the best way to learn it as fast as possible.

To get to my problem:

I have a gridPaper with container Widgets. Every time i click on a container it changes the color from white to black.

So far so good...

For my pathfinding algorithm i need a 'start' and 'end' container (obviously a container where my algorithm starts searching for the end point). Those i want to colorize in green (start) and red (end). If i open the settings widget to click on "Start", it changes a "var = int" to 2 and then it goes to a switch case function. From there if it gets a 1, it should print a black container, and if it gets a 2, it should fill the container green. But then it starts to fill every container with the color green, because it goes through the complete offset ...

Do do have any ideas how to solve my problem ?

Code:

is there anyone who can help me ?

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