Account for a walking path in bin

[jsp326]

I really like the work you have done for this library but I have an issue with how the packing works if I try and add a walking path inside the bin. The reason for this is when packing a container such as a shipping container, we need room to walk into the container. I ended up adding an additional item in the list that is the area of the walking room, but is there any way you could clarify how I could either add an item at exact coordinates, or set an item to be the first packed in the container every time?

[xuhuairuogu]

@jsp326 From the picture, it seems that you integrate this python software into a C/C++ application. How do you implement it? Rewrite the entire software by C/C++?