As with other areas in this book, we will just keep things simple when implementing the sample project. You can always extend or replace it later if you wish.
We will also look at two slightly different approaches: using a scene for the shop and a layer system for the inventory.
For the shop, we'll just create a new scene to keep things simple as we expect to enter a shop and leave it when we are done.
As I couldn't find anything I liked, I created a simple shop interface for use in the scene, as shown in the following screenshot:
These are just enough features for what we need to implement in the shop. For ...