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56 lines
1.7 KiB
56 lines
1.7 KiB
from manim import *
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class MovingAngle(Scene):
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def construct(self):
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rotation_center = LEFT
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theta_tracker = ValueTracker(110)
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line1 = Line(LEFT, RIGHT)
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line_moving = Line(LEFT, RIGHT)
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line_ref = line_moving.copy()
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line_moving.rotate(
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theta_tracker.get_value() * DEGREES, about_point=rotation_center
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)
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a = Angle(line1, line_moving, radius=0.5, other_angle=False)
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tex = MathTex(r"\theta").move_to(
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Angle(
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line1,
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line_moving,
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radius=0.5 +
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3 *
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SMALL_BUFF,
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other_angle=False).point_from_proportion(0.5))
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self.add(line1, line_moving, a, tex)
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self.wait()
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line_moving.add_updater(
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lambda x: x.become(
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line_ref.copy()).rotate(
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theta_tracker.get_value() *
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DEGREES,
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about_point=rotation_center))
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a.add_updater(
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lambda x: x.become(
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Angle(
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line1,
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line_moving,
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radius=0.5,
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other_angle=False)))
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tex.add_updater(
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lambda x: x.move_to(
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Angle(
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line1,
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line_moving,
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radius=0.5 +
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3 *
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SMALL_BUFF,
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other_angle=False).point_from_proportion(0.5)))
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self.play(theta_tracker.animate.set_value(40))
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self.play(theta_tracker.animate.increment_value(140))
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self.play(tex.animate.set_color(RED), run_time=0.5)
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self.play(theta_tracker.animate.set_value(350))
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