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moved neat projects from the example folder to docs
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‎docs/source/examples/neat_projects.rst

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11
NeatProjects
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=================================
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4-
This page is currently under construction. It will feature a selection of neat projects built with manim.
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.. manim:: OpeningManimExample
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:quality: low
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class OpeningManimExample(Scene):
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def construct(self):
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title = Tex("This is some \\LaTeX")
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basel = MathTex("\\sum_{n=1}^\\infty " "\\frac{1}{n^2} = \\frac{\\pi^2}{6}")
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VGroup(title, basel).arrange(DOWN)
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self.play(
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Write(title),
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FadeInFrom(basel, UP),
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)
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self.wait()
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transform_title = Tex("That was a transform")
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transform_title.to_corner(UP + LEFT)
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self.play(
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Transform(title, transform_title),
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LaggedStart(*map(FadeOutAndShiftDown, basel)),
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)
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self.wait()
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grid = NumberPlane()
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grid_title = Tex("This is a grid")
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grid_title.scale(1.5)
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grid_title.move_to(transform_title)
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self.add(grid, grid_title) # Make sure title is on top of grid
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self.play(
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FadeOut(title),
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FadeInFromDown(grid_title),
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ShowCreation(grid, run_time=3, lag_ratio=0.1),
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)
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self.wait()
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grid_transform_title = Tex(
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"That was a non-linear function \\\\" "applied to the grid"
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)
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grid_transform_title.move_to(grid_title, UL)
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grid.prepare_for_nonlinear_transform()
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self.play(
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grid.apply_function,
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lambda p: p
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+ np.array(
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[
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np.sin(p[1]),
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np.sin(p[0]),
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0,
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]
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),
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run_time=3,
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)
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self.wait()
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self.play(Transform(grid_title, grid_transform_title))
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self.wait()
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.. manim:: SquareToCircle
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:quality: low
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class SquareToCircle(Scene):
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def construct(self):
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circle = Circle()
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square = Square()
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square.flip(RIGHT)
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square.rotate(-3 * TAU / 8)
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circle.set_fill(PINK, opacity=0.5)
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self.play(ShowCreation(square))
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self.play(Transform(square, circle))
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self.play(FadeOut(square))
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.. manim:: WarpSquare
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:quality: low
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class WarpSquare(Scene):
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def construct(self):
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square = Square()
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self.play(
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ApplyPointwiseFunction(
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lambda point: complex_to_R3(np.exp(R3_to_complex(point))), square
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)
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)
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self.wait()
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.. manim:: WriteStuff
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:quality: low
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class WriteStuff(Scene):
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def construct(self):
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example_text = Tex("This is a some text", tex_to_color_map={"text": YELLOW})
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example_tex = MathTex(
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"\\sum_{k=1}^\\infty {1 \\over k^2} = {\\pi^2 \\over 6}",
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)
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group = VGroup(example_text, example_tex)
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group.arrange(DOWN)
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group.set_width(config["frame_width"] - 2 * LARGE_BUFF)
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self.play(Write(example_text))
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self.play(Write(example_tex))
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self.wait()
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.. manim:: UpdatersExample
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:quality: low
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class UpdatersExample(Scene):
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def construct(self):
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decimal = DecimalNumber(
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0,
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show_ellipsis=True,
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num_decimal_places=3,
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include_sign=True,
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)
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square = Square().to_edge(UP)
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decimal.add_updater(lambda d: d.next_to(square, RIGHT))
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decimal.add_updater(lambda d: d.set_value(square.get_center()[1]))
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self.add(square, decimal)
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self.play(
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square.to_edge,
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DOWN,
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rate_func=there_and_back,
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run_time=5,
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)
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self.wait()
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.. manim:: VDictExample
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:quality: low
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class VDictExample(Scene):
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def construct(self):
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square = Square().set_color(RED)
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circle = Circle().set_color(YELLOW).next_to(square, UP)
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# create dict from list of tuples each having key-mobject pair
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pairs = [("s", square), ("c", circle)]
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my_dict = VDict(pairs, show_keys=True)
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# display it just like a VGroup
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self.play(ShowCreation(my_dict))
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self.wait()
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text = Tex("Some text").set_color(GREEN).next_to(square, DOWN)
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# add a key-value pair by wrapping it in a single-element list of tuple
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# after attrs branch is merged, it will be easier like `.add(t=text)`
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my_dict.add([("t", text)])
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self.wait()
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rect = Rectangle().next_to(text, DOWN)
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# can also do key assignment like a python dict
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my_dict["r"] = rect
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# access submobjects like a python dict
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my_dict["t"].set_color(PURPLE)
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self.play(my_dict["t"].scale, 3)
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self.wait()
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# also supports python dict styled reassignment
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my_dict["t"] = Tex("Some other text").set_color(BLUE)
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self.wait()
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# remove submoject by key
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my_dict.remove("t")
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self.wait()
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self.play(Uncreate(my_dict["s"]))
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self.wait()
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self.play(FadeOut(my_dict["c"]))
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self.wait()
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self.play(FadeOutAndShift(my_dict["r"], DOWN))
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self.wait()
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# you can also make a VDict from an existing dict of mobjects
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plain_dict = {
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1: Integer(1).shift(DOWN),
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2: Integer(2).shift(2 * DOWN),
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3: Integer(3).shift(3 * DOWN),
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}
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vdict_from_plain_dict = VDict(plain_dict)
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vdict_from_plain_dict.shift(1.5 * (UP + LEFT))
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self.play(ShowCreation(vdict_from_plain_dict))
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# you can even use zip
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vdict_using_zip = VDict(zip(["s", "c", "r"], [Square(), Circle(), Rectangle()]))
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vdict_using_zip.shift(1.5 * RIGHT)
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self.play(ShowCreation(vdict_using_zip))
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self.wait()
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.. manim:: ExampleArrow
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:quality: low
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class VariableExample(Scene):
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def construct(self):
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var = 0.5
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on_screen_var = Variable(var, Text("var"), num_decimal_places=3)
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# You can also change the colours for the label and value
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on_screen_var.label.set_color(RED)
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on_screen_var.value.set_color(GREEN)
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self.play(Write(on_screen_var))
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# The above line will just display the variable with
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# its initial value on the screen. If you also wish to
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# update it, you can do so by accessing the `tracker` attribute
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self.wait()
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var_tracker = on_screen_var.tracker
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var = 10.5
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self.play(var_tracker.set_value, var)
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self.wait()
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int_var = 0
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on_screen_int_var = Variable(
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int_var, Text("int_var"), var_type=Integer
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).next_to(on_screen_var, DOWN)
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on_screen_int_var.label.set_color(RED)
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on_screen_int_var.value.set_color(GREEN)
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self.play(Write(on_screen_int_var))
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self.wait()
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var_tracker = on_screen_int_var.tracker
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var = 10.5
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self.play(var_tracker.set_value, var)
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self.wait()
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# If you wish to have a somewhat more complicated label for your
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# variable with subscripts, superscripts, etc. the default class
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# for the label is MathTex
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subscript_label_var = 10
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on_screen_subscript_var = Variable(subscript_label_var, "{a}_{i}").next_to(
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on_screen_int_var, DOWN
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)
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self.play(Write(on_screen_subscript_var))
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self.wait()

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