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66 lines
2.1 KiB
Python
66 lines
2.1 KiB
Python
from manimlib.animation.composition import OldLaggedStart
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from manimlib.animation.transform import ApplyMethod
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from manimlib.constants import *
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from manimlib.mobject.geometry import Circle
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from manimlib.mobject.svg.drawings import Car
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from manimlib.mobject.types.vectorized_mobject import VGroup
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from manimlib.utils.config_ops import digest_config
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from manimlib.utils.space_ops import get_norm
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class MoveCar(ApplyMethod):
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CONFIG = {
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"moving_forward": True,
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}
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def __init__(self, car, target_point, **kwargs):
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assert isinstance(car, Car)
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ApplyMethod.__init__(self, car.move_to, target_point, **kwargs)
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displacement = self.target_mobject.get_right() - self.starting_mobject.get_right()
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distance = get_norm(displacement)
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if not self.moving_forward:
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distance *= -1
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tire_radius = car.get_tires()[0].get_width() / 2
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self.total_tire_radians = -distance / tire_radius
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def interpolate_mobject(self, alpha):
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ApplyMethod.interpolate_mobject(self, alpha)
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if alpha == 0:
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return
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radians = alpha * self.total_tire_radians
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for tire in self.mobject.get_tires():
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tire.rotate_in_place(radians)
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class Broadcast(OldLaggedStart):
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CONFIG = {
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"small_radius": 0.0,
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"big_radius": 5,
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"n_circles": 5,
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"start_stroke_width": 8,
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"color": WHITE,
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"remover": True,
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"lag_ratio": 0.7,
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"run_time": 3,
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"remover": True,
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}
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def __init__(self, focal_point, **kwargs):
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digest_config(self, kwargs)
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circles = VGroup()
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for x in range(self.n_circles):
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circle = Circle(
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radius=self.big_radius,
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stroke_color=BLACK,
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stroke_width=0,
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)
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circle.move_to(focal_point)
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circle.save_state()
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circle.set_width(self.small_radius * 2)
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circle.set_stroke(self.color, self.start_stroke_width)
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circles.add(circle)
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OldLaggedStart.__init__(
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self, ApplyMethod, circles,
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lambda c: (c.restore,),
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**kwargs
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)
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