Decorators for Tweening

Often when thinking in game development terms, it can be tempting to think of game logic and then easing and tweens as an afterwards. Unfortunately, this can result in a lot of code restructuring. Transytion can help prevent major refactoring by utilizing Python decorators.

Consider the following scenario: You want a player to move and then say something. Ignoring animations, one might write:

def say_something():
    print("Hello!")

say_something()

But if we follow the example above it is a little awkward to combine this with move:

def say_something():
    print("Hello!")

move = Tween(..., callback=say_something)

...

transytion uses decorators to minimize cognitive load. The following is equivalent to the previous example:

move = Tween(...)
@tween_then_call(move)
def say_something():
    print("Hello!")

say_something()
...

The @tween_then_call(tween) decorator delays function calls to execute after the supplied tween executes. Thus, we can focus on game logic first then decorate the logic to incorporate tweens.