manim/docs/source/examples/formulas.rst

Formulas
=================================

.. manim:: Formula1
    :save_last_frame:

    class Formula1(Scene):
        def construct(self):
            t = MathTex(r"\int_a^b f'(x) dx = f(b)- f(a)")
            self.add(t)
            self.wait(1)


.. manim:: MoveFrameBox

    class MoveFrameBox(Scene):
        def construct(self):
            text=TexMobject(
                "\\frac{d}{dx}f(x)g(x)=","f(x)\\frac{d}{dx}g(x)","+",
                "g(x)\\frac{d}{dx}f(x)"
            )
            self.play(Write(text))
            framebox1 = SurroundingRectangle(text[1], buff = .1)
            framebox2 = SurroundingRectangle(text[3], buff = .1)
            self.play(
                ShowCreation(framebox1),
            )
            self.wait()
            self.play(
                ReplacementTransform(framebox1,framebox2),
            )
            self.wait()

.. manim:: MoveBraces

    class MoveBraces(Scene):
        def construct(self):
            text=TexMobject(
                "\\frac{d}{dx}f(x)g(x)=",       #0
                "f(x)\\frac{d}{dx}g(x)",        #1
                "+",                            #2
                "g(x)\\frac{d}{dx}f(x)"         #3
            )
            self.play(Write(text))
            brace1 = Brace(text[1], UP, buff=SMALL_BUFF)
            brace2 = Brace(text[3], UP, buff=SMALL_BUFF)
            t1 = brace1.get_text("$g'f$")
            t2 = brace2.get_text("$f'g$")
            self.play(
                GrowFromCenter(brace1),
                FadeIn(t1),
                )
            self.wait()
            self.play(
                ReplacementTransform(brace1,brace2),
                ReplacementTransform(t1,t2)
                )
            self.wait()