def show_ghost_movement(self, vector): if isinstance(vector, Arrow): vector = vector.get_end() - vector.get_start() elif len(vector) == 2: vector = np.append(np.array(vector), 0.0) x_max = int(FRAME_X_RADIUS + abs(vector[0])) y_max = int(FRAME_Y_RADIUS + abs(vector[1])) dots = VMobject(*[ Dot(x * RIGHT + y * UP) for x in range(-x_max, x_max) for y in range(-y_max, y_max) ]) dots.set_fill(BLACK, opacity=0) dots_halfway = dots.copy().shift(vector / 2).set_fill(WHITE, 1) dots_end = dots.copy().shift(vector) self.play(Transform(dots, dots_halfway, rate_func=rush_into)) self.play(Transform(dots, dots_end, rate_func=rush_from)) self.remove(dots)
def show_ghost_movement(self, vector): if isinstance(vector, Arrow): vector = vector.get_end() - vector.get_start() elif len(vector) == 2: vector = np.append(np.array(vector), 0.0) x_max = int(FRAME_X_RADIUS + abs(vector[0])) y_max = int(FRAME_Y_RADIUS + abs(vector[1])) dots = VMobject(*[ Dot(x * RIGHT + y * UP) for x in range(-x_max, x_max) for y in range(-y_max, y_max) ]) dots.set_fill(BLACK, opacity=0) dots_halfway = dots.copy().shift(vector / 2).set_fill(WHITE, 1) dots_end = dots.copy().shift(vector) self.play(Transform( dots, dots_halfway, rate_func=rush_into )) self.play(Transform( dots, dots_end, rate_func=rush_from )) self.remove(dots)
def get_piece_movement(self, pieces): start = VMobject(*pieces) target = VMobject(*[mob.target for mob in pieces]) if self.leave_ghost_vectors: self.add(start.copy().fade(0.7)) return Transform(start, target, submobject_mode="all_at_once")