state.py

## 空state，不产生任何的效果
class State(object):
    def __init__(self):
        pass

    def enter(self, entity, param_table, state_maintain, global_maintain):
        pass

    def update(self, entity, param_table, state_maintain, global_maintain):
        pass

    def leave(self, entity, param_table, state_maintain, global_maintain):
        state_maintain.clear()

    def run(self, entity, param_table, state_maintain, global_maintain):
        if state_maintain.get('init'):
            # 已经跑过一次咯
            self.update(entity, param_table, state_maintain, global_maintain)

        else:
            self.enter(entity, param_table, state_maintain, global_maintain)
            state_maintain['init'] = True

    def stop(self, entity, param_table, state_maintain, global_maintain):
        self.leave(entity, param_table, state_maintain, global_maintain)

class Accelerate_State(State):
    def enter(self, entity, param_table, state_maintain, global_maintain):

        state_maintain['orig_speed'] = entity.speed
        entity.speed += param_table['speed']

    def level(self, entity, param_table, state_maintain, global_maintain):

        entity.speed = state_maintain['orig_speed']
        state_maintain.clear()