def create_new_asteroid(self, new_size, torpedo, asteroid,
reverse=False):
"""
Creates two sub_asteroids of a given asteroid that was hit by
a torpedo
:param new_size: the size of the new sub-asteroids
:param torpedo: the torpedo that damaged the asteroid
:param asteroid: the old asteroid that was hit by a torpedo
:param reverse: Boolean value, checking if the new generated direction
should be reversed
"""
new_ast = Asteroid(new_size, self.screen_max_x, self.screen_max_y,
self.screen_min_x, self.screen_min_y)
self.asteroids_list.append(new_ast)
# Assigning new speed according to the asteroid's and torpedo's
# old speed
new_ast.gen_speed_x(torpedo.get_speed_x(), asteroid.get_speed_x())
new_ast.gen_speed_y(torpedo.get_speed_y(), asteroid.get_speed_y())
# Assigning the position of the dead asteroid to the sub-asteroid
new_ast.force_pos_x(asteroid.get_pos_x())
new_ast.force_pos_y(asteroid.get_pos_y())
if reverse:
new_ast.reverse_direction()
self._screen.register_asteroid(new_ast, new_size)
self._screen.draw_asteroid(new_ast, new_ast.get_pos_x(),
new_ast.get_pos_y())
def split_asteroid(self, asteroid: Asteroid, torpedo: Torpedo):
"""if torpedo hit asteroid (in size more then 1) the function split
the asteroid to two new smaller asteroids. the new asteroid move in
opposite directions and the size of them is one unit less (from the
original asteroid). the function remove the original asteroid and the
torpedo that hit him!"""
# the formula given in ex.pdf
sum_speed_x = torpedo.get_speed_x() + asteroid.get_speed_x()
sum_speed_y = torpedo.get_speed_y() + asteroid.get_speed_y()
current_x_and_y_speed = math.pow(asteroid.get_speed_x(), 2) \
+ math.pow(asteroid.get_speed_y(), 2)
for i in range(2):
# create two new asteroid (split the original asteroid)
new_asteroid = Asteroid(asteroid.get_size() - ONE_UNIT_LESS)
new_asteroid.set_new_speed_x(sum_speed_x /
math.sqrt(current_x_and_y_speed))
new_asteroid.set_new_speed_y(sum_speed_y /
math.sqrt(current_x_and_y_speed))
new_asteroid.set_new_pos_in_x(asteroid.get_pos_x())
new_asteroid.set_new_pos_in_y(asteroid.get_pos_y())
# the size of the new asteroids is smaller by one unit
self._screen.register_asteroid(new_asteroid,
asteroid.get_size() - ONE_UNIT_LESS)
self.__asteroids.append(new_asteroid)
if i == 1:
# change the movement of one of the asteroids to the
# opposite direction
new_asteroid.set_new_speed_x(new_asteroid.get_speed_x() *
OPPOSITE)
new_asteroid.set_new_speed_x(new_asteroid.get_speed_y() *
OPPOSITE)
# remove the original asteroid after we split him
self._screen.unregister_asteroid(asteroid)
self.__asteroids.remove(asteroid)
# remove the torpedo after he hit the asteroid
self._screen.unregister_torpedo(torpedo)
self.__torpedos.remove(torpedo)
