scenes.md

Programs

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()

class MoveBracesCopy(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))
        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.copy(),brace2),
        	ReplacementTransform(t1.copy(),t2)
        	)
        self.wait()

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()

class MoveFrameBoxCopy(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.copy(),framebox2),
        	path_arc=-np.pi
        	)
        self.wait()

class MoveFrameBoxCopy2(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)
        t1 = TexMobject("g'f")
        t2 = TexMobject("f'g")
        t1.next_to(framebox1, UP, buff=0.1)
        t2.next_to(framebox2, UP, buff=0.1)
        self.play(
        	ShowCreation(framebox1),
        	FadeIn(t1)
        	)
        self.wait()
        self.play(
        	ReplacementTransform(framebox1.copy(),framebox2),
        	ReplacementTransform(t1.copy(),t2),
        	)
        self.wait()

class Arrow1(Scene):
	def construct(self):
		step1 = TextMobject("Step 1")
		step2 = TextMobject("Step 2")
		arrow = Arrow(LEFT,RIGHT)
		step1.move_to(LEFT*2)
		arrow.next_to(step1,RIGHT,buff = .1)
		step2.next_to(arrow,RIGHT,buff = .1)
		self.play(Write(step1))
		self.wait()
		self.play(GrowArrow(arrow))
		self.play(Write(step2))
		self.wait()

class Arrow2(Scene):
	def construct(self):
		step1 = TextMobject("Step 1")
		step2 = TextMobject("Step 2")
		step1.move_to(LEFT*2+DOWN*2)
		step2.move_to(4*RIGHT+2*UP)
		arrow1 = Arrow(step1.get_right(),step2.get_left(),buff=0.1)
		arrow1.set_color(RED)
		arrow2 = Arrow(step1.get_top(),step2.get_bottom(),buff=0.1)
		arrow2.set_color(BLUE)
		self.play(Write(step1),Write(step2))
		self.play(GrowArrow(arrow1))
		self.play(GrowArrow(arrow2))
		self.wait()

class LineAnimation(Scene):
    def construct(self):
        step1 = TextMobject("Step 1")
        step2 = TextMobject("Step 2")
        step1.move_to(LEFT*2+DOWN*2)
        step2.move_to(4*RIGHT+2*UP)
        arrow1 = Line(step1.get_right(),step2.get_left(),buff=0.1)
        arrow1.set_color(RED)
        arrow2 = Line(step1.get_top(),step2.get_bottom(),buff=0.1)
        arrow2.set_color(BLUE)
        self.play(Write(step1),Write(step2))
        self.play(ShowCreation(arrow1))
        self.play(ShowCreation(arrow2))
        self.wait()

class DashedLineAnimation(Scene):
    def construct(self):
        step1 = TextMobject("Step 1")
        step2 = TextMobject("Step 2")
        step1.move_to(LEFT*2+DOWN*2)
        step2.move_to(4*RIGHT+2*UP)
        arrow1 = DashedLine(step1.get_right(),step2.get_left(),buff=0.1)
        arrow1.set_color(RED)
        arrow2 = Line(step1.get_top(),step2.get_bottom(),buff=0.1)
        arrow2.set_color(BLUE)
        self.play(Write(step1),Write(step2))
        self.play(ShowCreation(arrow1))
        self.play(ShowCreation(arrow2))
        self.wait()

class LineAnimation2(Scene):
	def construct(self):
		step1 = TextMobject("Step 1")
		step2 = TextMobject("Step 2")
		step1.move_to(LEFT*2+DOWN*2)
		step2.move_to(4*RIGHT+2*UP)
		line = Line(step1.get_right(),step2.get_left(),buff=0.1)
		self.play(Write(step1),Write(step2))
		self.play(GrowArrow(line))
		self.play(
			step2.next_to, step2, LEFT*2,
			)
		self.wait()

class LineAnimation3(Scene):
	def construct(self):
		step1 = TextMobject("Step 1")
		step2 = TextMobject("Step 2")
		step3 = step2.copy()
		step1.move_to(LEFT*2+DOWN*2)
		step2.move_to(4*RIGHT+2*UP)
		step3.next_to(step2, LEFT*2)
		line = Line(step1.get_right(),step2.get_left(),buff=0.1)
		lineCopy = Line(step1.get_right(),step3.get_bottom(),buff=0.1)
		self.play(Write(step1),Write(step2))
		self.play(GrowArrow(line))
		self.play(
			ReplacementTransform(step2,step3),
			ReplacementTransform(line,lineCopy)
			)
		self.wait()