def _gen_asteroid(self):
"""Generates a new asteroid
Returns:
a new, randomly generated asteroid
"""
# Get a random size, with probability depending on the game
# rules
size = weighted_choice(self.curr_level.size_weights)
# Generate a position out of bounds, and a random direction
# to move towards
possible_x = range(-60, -10, 10) + range(WINDOW_WIDTH+20,
WINDOW_WIDTH+70, 10)
possible_y = range(-60, -10, 10) + range(WINDOW_HEIGHT+20,
WINDOW_HEIGHT+70, 10)
pos = Vector(rand.choice(possible_x), rand.choice(possible_y))
direction = rand_direction(pos)
# Generate random linear and rotational speeds
lin_speed = rand.uniform(Asteroid.min_lin_speed,
Asteroid.max_lin_speed)
rot_speed = rand.uniform(0, Asteroid.max_rot_speed)
return Asteroid(size, direction, lin_speed, rot_speed, pos=pos)
def ad_gen_particles():
fragments = []
for i in range(1, 11):
lin_speed = rand.uniform(0.5, 1.5)
# Note that we generate random directions relative to the
# middle of the screen, because rand_direction is based on
# having a reference position in game bounds
fragment = Entity((-1, 1, 1, 1, 1, -1, -1, -1),
rand_direction(Vector(WINDOW_WIDTH//2,
WINDOW_HEIGHT//2)),
lin_speed)
fragments.append(fragment)
return fragments
def _get_random_asteroid(self, size):
"""Creates a random asteroid that results from the destruction
of this asteroid
Parameters:
size: the size that the new asteroid will have
Returns:
a new random asteroid, based on the characteristcs of
this asteroid
"""
# Generate random speeds
lin_speed = rand.uniform(self.min_lin_speed, self.max_lin_speed)
rot_speed = rand.uniform(0, self.max_rot_speed)
# Get random direction
direction = rand_direction(self.pos)
return Asteroid(size, direction, lin_speed, rot_speed, pos=self.pos,
shape_index=self.shape_index)
