def reset_path(self):
AccelerationPath.reset(self)
''' set position for alien ship out of the screen '''
self.set_position((-90, -90))
''' set no velocity and acceleration '''
self.set_acceleration(0, 0)
self.set_velocity(0, 0)
self.is_hidden = True
self.hide_time, self.show_time = 0, 0
self.hide_object_time = random.randrange(5, 25) * 1000
self.show_object_time = random.randrange(1, 10) * 1000
self.visible_on_screen, self.approach_object = False, False
def next(self):
ticks = conf.ticks
if not self.is_hidden:
self.show_time += ticks
if self.show_time > self.show_object_time:
self.approach()
else:
self.hide_time += ticks
if self.hide_time > self.hide_object_time:
self.set_random_path()
self.is_hidden = False
self.visible_on_screen = True
if self.approach_object and self.visible_on_screen:
if not self.is_on_screen(180):
self.reset_path()
return AccelerationPath.next(self, ticks)
def __init__(self):
AccelerationPath.__init__(self)
self.reset_path()