Game Development Patterns and Best Practices

Undo and redo

Another major benefit of having the call details packaged together in a class is the ability to undo an operation. Every modern desktop application, as well as the best web applications being made these days, features the ability to undo the last action or actions. This should be a standard that you strive to follow when implementing a level editor for your game.

Implementing a single level of undo in an application can seem like a large task. The naive approach might be to save the entire state of the application, possibly to a file, and reload that state when we need to undo. Depending on the application, there might be a lot of data to save. This method doesn't scale well in applications that can have dozens or hundreds of ...