def rotate(self, angle, axis=OUT, **kwargs):
rot_matrix = rotation_matrix(angle, axis)
self.apply_points_function_about_point(
lambda points: np.dot(points, rot_matrix.T),
**kwargs
)
return self
def path(start_points, end_points, alpha):
vects = end_points - start_points
centers = start_points + 0.5 * vects
if arc_angle != np.pi:
centers += np.cross(unit_axis, vects / 2.0) / np.tan(arc_angle / 2)
rot_matrix = rotation_matrix(alpha * arc_angle, unit_axis)
return centers + np.dot(start_points - centers, rot_matrix.T)
def rotate(self, angle, axis=OUT, **kwargs):
rot_matrix = rotation_matrix(angle, axis)
self.apply_points_function_about_point(
lambda points: np.dot(points, rot_matrix.T),
**kwargs
)
return self
def rotate(self, angle, axis=OUT, **kwargs):
"""
Rotate the Mobject, by default about its center
"""
rot_matrix = rotation_matrix(angle, axis)
self.apply_points_function_about_point(
lambda points: np.dot(points, rot_matrix.T),
**kwargs
)
return self
def generate_rotation_matrix(self):
phi = self.get_phi()
theta = self.get_theta()
gamma = self.get_gamma()
matrices = [
rotation_about_z(-theta - 90 * DEGREES),
rotation_matrix(-phi, RIGHT),
rotation_about_z(gamma),
]
result = np.identity(3)
for matrix in matrices:
result = np.dot(matrix, result)
return result
def rotate(points, angle=np.pi, axis=OUT):
if axis is None:
return points
matrix = rotation_matrix(angle, axis)
points = np.dot(points, np.transpose(matrix))
return points
def get_view_transformation_matrix(self):
return (self.default_distance / self.get_distance()) * np.dot(
rotation_matrix(self.get_phi(), LEFT),
rotation_about_z(-self.get_theta() - np.pi / 2),
)
def rotate(points, angle=np.pi, axis=OUT):
if axis is None:
return points
matrix = rotation_matrix(angle, axis)
points = np.dot(points, np.transpose(matrix))
return points
