TrafficControl: NetworkDesigner Class for Designing Networks

Before proceeding with the network designer, I need to plan where to add the new functionality,

One use case will be:

1. User selects a complex but valid KML file.
2. The python script trackStationConnector.py converts the file and displays the output on trafficNetworkDescriptionEdit.
3. If there are issues seen, the program should inform the user
4. If there are no blocking issues, the user can save the file and/or continue with using the train network that is now loaded.

Initially, I'll assume that the input from the user is correct. I'll add error checks later.

How it's done:
The button for selecting the KML file is associated with the action actionImportKmlFile. That action activates a slot in trafficControl that allows the user to select the KML file to import.

I have separated the code for selecting a file and the code that is opening the file for testability reasons. This way, I'll be able to open files in automated testing.

Here, the file path is hard coded. I need to have a generic default directory, such as the user's home folder.

Once the file is selected, it is opened from networkDesigner:

The program calls the python interpreter on the system, and parses the path to the python script as the first argument and the KML file as the second argument. This approach is very system-dependent and anyone that fetches my GIT repo must adapt this part. I need to fix tis issue in a later blog post.

All output from the python script is saved and parsed to trafficControl::updateTnmTextBox that is setting the text. It also parses the commands to networkControl so that the corresponding elements appears on the map. For testability, this needs to change so that the networkDesigner can communicate directly to networkControl using signals/slots.

Finally, the program saves the contents of the two text fields to one file.

This solution is hardcoded for my system. I need to make it more generic in future versions. Now, the program works only if puthon is installed on the computer, and the python path must be "c:/users/gusbra...".