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74 lines
2.1 KiB
Python
74 lines
2.1 KiB
Python
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from big_ol_pile_of_manim_imports import *
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from active_projects.shadows import *
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class AskAboutShadowRelation(SpecialThreeDScene):
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def construct(self):
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self.show_surface_area()
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self.show_area_of_shadow()
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self.show_light_source()
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self.show_four_circles()
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def show_surface_area(self):
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sphere = self.get_sphere()
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sphere.set_fill(BLUE_E, opacity=0.5)
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sphere.add_updater(
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lambda s, dt: s.rotate(0.1 * dt, axis=OUT)
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)
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pieces = sphere.deepcopy()
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pieces.space_out_submobjects(1.5)
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pieces.shift(IN)
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pieces.set_color(GREEN)
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# radial_line = Line(ORIGIN, sphere.get_right())
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# R_label = TexMobject("R")
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# R_label.set_color(BLUE)
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# R_label.rotate(90 * DEGREES, RIGHT)
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# R_label.next_to(radial_line, OUT, SMALL_BUFF)
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sa_equation = TexMobject(
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"\\text{Surface area} = 4\\pi R^2",
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tex_to_color_map={"R": BLUE}
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)
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sa_equation.scale(1.5)
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sa_equation.to_edge(UP)
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self.set_camera_to_default_position()
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self.add_fixed_in_frame_mobjects(sa_equation)
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self.play(
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Write(sphere, run_time=1),
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FadeInFromDown(sa_equation),
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# ShowCreation(radial_line),
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# FadeInFrom(R_label, IN),
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)
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self.play(
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Transform(
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sphere, pieces,
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rate_func=there_and_back_with_pause,
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run_time=2
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)
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)
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self.play(LaggedStart(
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UpdateFromAlphaFunc, sphere,
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lambda mob: (mob, lambda m, a: m.set_fill(
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color=interpolate_color(BLUE_E, YELLOW, a),
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opacity=interpolate(0.5, 1, a)
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)),
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rate_func=there_and_back,
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lag_ratio=0.2,
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))
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self.play(self.camera.frame_center.shift, 2 * LEFT)
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self.wait(2)
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self.sphere = sphere
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self.sa_equation = sa_equation
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def show_area_of_shadow(self):
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pass
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def show_light_source(self):
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pass
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def show_four_circles(self):
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pass
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