pulsator.py

# A Pulsator is a Black_Hole; it updates as a Black_Hole
#   does, but also by growing/shrinking depending on
#   whether or not it eats Prey (and removing itself from
#   the simulation if its dimension becomes 0), and displays
#   as a Black_Hole but with varying dimensions



from blackhole import Black_Hole


class Pulsator(Black_Hole): #inherit black hole
    no_eaten_counter = 30   
    
    def __init__(self, x, y):   
        Black_Hole.__init__(self, x, y)
        self._counter = 0
        
        
    def update(self, model):
        self._counter += 1
        eaten_set = Black_Hole.update(self, model)
        
        if self.get_dimension()[1] == 0:
            model.remove(self)
            self._counter = 0
            
        if len(eaten_set) != 0:
            self._counter = 0
            self.change_dimension(1, 1)
        elif self._counter == Pulsator.no_eaten_counter:
            self.change_dimension(-1, -1)
            self._counter = 0
            
        if self.get_dimension()[1] == 0:
            model.remove(self)
            self._counter = 0
        return eaten_set