Source code for manim.animation.rotation

"""Animations related to rotation."""

from __future__ import annotations

__all__ = ["Rotating", "Rotate"]

from typing import TYPE_CHECKING, Callable, Sequence

import numpy as np

from ..animation.animation import Animation
from ..animation.transform import Transform
from ..constants import OUT, PI, TAU
from ..utils.rate_functions import linear

    from ..mobject.mobject import Mobject

[docs]class Rotating(Animation): def __init__( self, mobject: Mobject, axis: np.ndarray = OUT, radians: np.ndarray = TAU, about_point: np.ndarray | None = None, about_edge: np.ndarray | None = None, run_time: float = 5, rate_func: Callable[[float], float] = linear, **kwargs, ) -> None: self.axis = axis self.radians = radians self.about_point = about_point self.about_edge = about_edge super().__init__(mobject, run_time=run_time, rate_func=rate_func, **kwargs)
[docs] def interpolate_mobject(self, alpha: float) -> None: self.mobject.become(self.starting_mobject) self.mobject.rotate( self.rate_func(alpha) * self.radians, axis=self.axis, about_point=self.about_point, about_edge=self.about_edge, )
[docs]class Rotate(Transform): """Animation that rotates a Mobject. Parameters ---------- mobject The mobject to be rotated. angle The rotation angle. axis The rotation axis as a numpy vector. about_point The rotation center. about_edge If ``about_point``is ``None``, this argument specifies the direction of the bounding box point to be taken as the rotation center. Examples -------- .. manim:: UsingRotate class UsingRotate(Scene): def construct(self): Rotate( Square(side_length=0.5).shift(UP * 2), angle=2*PI, about_point=ORIGIN, rate_func=linear, ), Rotate(Square(side_length=0.5), angle=2*PI, rate_func=linear), ) """ def __init__( self, mobject: Mobject, angle: float = PI, axis: np.ndarray = OUT, about_point: Sequence[float] | None = None, about_edge: Sequence[float] | None = None, **kwargs, ) -> None: if "path_arc" not in kwargs: kwargs["path_arc"] = angle if "path_arc_axis" not in kwargs: kwargs["path_arc_axis"] = axis self.angle = angle self.axis = axis self.about_edge = about_edge self.about_point = about_point if self.about_point is None: self.about_point = mobject.get_center() super().__init__(mobject, path_arc_centers=self.about_point, **kwargs) def create_target(self) -> Mobject: target = self.mobject.copy() target.rotate( self.angle, axis=self.axis, about_point=self.about_point, about_edge=self.about_edge, ) return target