Python Game Programming By Example

Building a game framework

The Component and GameObject classes form the core of our game engine. The interface offered by the Component class is as easy as this:

class Component(object):
    __slots__ = ['gameobject']

    def start(self):
        pass
    def update(self, dt):
        pass
    def stop(self):
        pass
    def on_collide(self, other, contacts):
        pass

These methods define the life cycle of our components:

• start(): This is called when the component is added to the game object instance. The component keeps a reference to the game object as self.gameobject.
• update(dt): This is called for each frame, where the dt argument is the elapsed time in seconds since the previous frame.
• on_collide(other, contacts): This is called when the component's game object collides with another rigid ...