3b1b-manim/topics/common_scenes.py

from helpers import *

from scene.scene import Scene
from animation.simple_animations import Write, DrawBorderThenFill, LaggedStart
from animation.transform import FadeIn, FadeOut, ApplyMethod
from mobject.vectorized_mobject import VGroup
from mobject.tex_mobject import TexMobject, TextMobject
from topics.characters import Mortimer, Blink
from topics.objects import PatreonLogo


class OpeningQuote(Scene):
    CONFIG = {
        "quote" : [],
        "quote_arg_separator" : " ",
        "highlighted_quote_terms" : {},
        "author" : "",
        "fade_in_kwargs" : {
            "submobject_mode" : "lagged_start",
            "rate_func" : None,
            "lag_factor" : 4,
            "run_time" : 5,
        },
    }
    def construct(self):
        self.quote = self.get_quote()
        self.author = self.get_author(self.quote)

        self.play(FadeIn(self.quote, **self.fade_in_kwargs))
        self.dither(2)
        self.play(Write(self.author, run_time = 3))
        self.dither()

    def get_quote(self, max_width = 2*SPACE_WIDTH-1):
        text_mobject_kwargs = {
            "alignment" : "",
            "arg_separator" : self.quote_arg_separator,
        }
        if isinstance(self.quote, str):
            quote = TextMobject("``%s''"%self.quote.strip(), **text_mobject_kwargs)
        else:
            words = ["\\Large ``"] + list(self.quote) + ["''"]
            quote = TextMobject(*words, **text_mobject_kwargs)
            ##TODO, make less hacky
            if self.quote_arg_separator == " ":
                quote[0].shift(0.2*RIGHT)
                quote[-1].shift(0.2*LEFT)
        for term, color in self.highlighted_quote_terms.items():
            quote.highlight_by_tex(term, color)
        quote.to_edge(UP)
        if quote.get_width() > max_width:
            quote.scale_to_fit_width(max_width)
        return quote

    def get_author(self, quote):
        author = TextMobject("\\Large -" + self.author)
        author.next_to(quote, DOWN)
        author.highlight(YELLOW)
        return author

class PatreonThanks(Scene):
    CONFIG = {
        "specific_patrons" : [
            "Ali Yahya",
            "Meshal Alshammari",
            "CrypticSwarm    ",
            "Justin Helps",
            "Ankit Agarwal",
            "Yu Jun",
            "Shelby Doolittle",
            "Dave Nicponski",
            "Damion Kistler",
            "Juan Benet",
            "Othman Alikhan",
            "Markus Persson",
            "Dan Buchoff",
            "Derek Dai",
            "Joseph John Cox",
            "Luc Ritchie",
            "Nils Schneider",
            "Mathew Bramson",
            "Guido Gambardella",
            "Jerry Ling",
            "Mark Govea",
            "Vecht",
            "Shimin Kuang",
            "Rish Kundalia",
            "Achille Brighton",
            "Kirk Werklund",
            "Ripta Pasay",
            "Felipe Diniz",
        ],
        "max_patron_group_size" : 20,
        "patron_scale_val" : 0.8,

    }
    def construct(self):
        morty = Mortimer()
        morty.next_to(ORIGIN, DOWN)

        patreon_logo = PatreonLogo()
        patreon_logo.to_edge(UP)

        n_patrons = len(self.specific_patrons)
        patrons = map(TextMobject, self.specific_patrons)
        num_groups = float(len(patrons)) / self.max_patron_group_size
        proportion_range = np.linspace(0, 1, num_groups + 1)
        indices = (len(patrons)*proportion_range).astype('int')
        patron_groups = [
            VGroup(*patrons[i:j])
            for i, j in zip(indices, indices[1:])
        ]        

        for i, group in enumerate(patron_groups):
            left_group = VGroup(*group[:len(group)/2])
            right_group = VGroup(*group[len(group)/2:])
            for subgroup, vect in (left_group, LEFT), (right_group, RIGHT):
                subgroup.arrange_submobjects(DOWN, aligned_edge = LEFT)
                subgroup.scale(self.patron_scale_val)
                subgroup.to_edge(vect)

        last_group = None
        for i, group in enumerate(patron_groups):
            anims = []
            if last_group is not None:
                self.play(
                    FadeOut(last_group),
                    morty.look, UP+LEFT
                )
            else:
                anims += [
                    DrawBorderThenFill(patreon_logo),
                ]
            self.play(
                LaggedStart(
                    FadeIn, group, 
                    run_time = 2,
                ),
                morty.change, "gracious", group.get_corner(UP+LEFT),
                *anims
            )
            self.play(morty.look_at, group.get_corner(DOWN+LEFT))
            self.play(morty.look_at, group.get_corner(UP+RIGHT))
            self.play(morty.look_at, group.get_corner(DOWN+RIGHT))
            self.play(Blink(morty))
            last_group = group

class ExternallyAnimatedScene(Scene):
    def construct(self):
        raise Exception("Don't actually run this class.")