Added Auto Zoom functionality to scene.py

[HadiSDev]

Motivation

I wanted to add the Auto Zoom functionality back to manim as it is very useful :) And saves a lot of time

Credits to @benjaminolsen12 for doing the conversion

Proposed changes

• scene.py
  I Basically copied the old implementation

Test

Code:

class SquareToCircle(Scene):
    def construct(self):
        circle = Circle()
        circle.set_fill(BLUE, opacity=0.5)
        circle.set_stroke(BLUE_E, width=4)
        square = Square()

        self.play(ShowCreation(square))
        self.wait()
        self.play(ReplacementTransform(square, circle))
        self.wait()
        square = Square().move_to(LEFT)
        self.play(ShowCreation(square))
        self.play(self.auto_zoom([square]))

Result:

[3b1b]

Thanks for contributing! A few comments:

• I think a lot of the implementation computes what you would get with the simpler line Group(*mobjects).get_bounding_box()
• I wonder if it would be better to just make this a method of CameraFrame, so that one might call self.play(frame.animate.zoom_to(square)), or something like that.