From 0c6546b19e7c00a4621a71f1ae847a4e7412e45c Mon Sep 17 00:00:00 2001
From: Grant Sanderson <grant@3blue1brown.com>
Date: Tue, 6 Mar 2018 18:26:07 -0800
Subject: [PATCH] Created WindingNumber_G.py for some added animations

---
 active_projects/WindingNumber_G.py | 187 +++++++++++++++++++++++++++++
 1 file changed, 187 insertions(+)
 create mode 100644 active_projects/WindingNumber_G.py

diff --git a/active_projects/WindingNumber_G.py b/active_projects/WindingNumber_G.py
new file mode 100644
index 00000000..2caf0a84
--- /dev/null
+++ b/active_projects/WindingNumber_G.py
@@ -0,0 +1,187 @@
+from helpers import *
+
+from mobject.tex_mobject import TexMobject
+from mobject import Mobject
+from mobject.image_mobject import ImageMobject
+from mobject.vectorized_mobject import *
+
+from animation.animation import Animation
+from animation.transform import *
+from animation.simple_animations import *
+from animation.playground import *
+from animation.continual_animation import *
+from topics.geometry import *
+from topics.characters import *
+from topics.functions import *
+from topics.fractals import *
+from topics.number_line import *
+from topics.combinatorics import *
+from topics.numerals import *
+from topics.three_dimensions import *
+from topics.objects import *
+from topics.probability import *
+from topics.complex_numbers import *
+from scene import Scene
+from scene.reconfigurable_scene import ReconfigurableScene
+from scene.zoomed_scene import *
+from camera import *
+from mobject.svg_mobject import *
+from mobject.tex_mobject import *
+from topics.graph_scene import *
+
+from active_projects.WindingNumber import *
+
+class AltTeacherStudentScene(TeacherStudentsScene):
+    def setup(self):
+        TeacherStudentsScene.setup(self)
+        self.teacher.set_color(YELLOW_E)
+
+###############
+
+
+class TestColorMap(ColorMappedObjectsScene):
+    CONFIG = {
+        "func" : example_plane_func,
+    }
+    def construct(self):
+        ColorMappedObjectsScene.construct(self)
+        circle = Circle(color = WHITE)
+        circle.color_using_background_image(self.background_image_file)
+
+        self.play(ShowCreation(circle))
+        self.play(circle.scale, 2)
+        self.wait()
+        self.play(circle.set_fill, {"opacity" : 0.2})
+        for corner in standard_rect:
+            self.play(circle.to_corner, corner, run_time = 2)
+
+
+class PiCreaturesAreIntrigued(AltTeacherStudentScene):
+    def construct(self):
+        self.teacher_says(
+            "You can extend \\\\ this to 2d",
+            bubble_kwargs = {"width" : 4, "height" : 3}
+        )
+        self.change_student_modes("pondering", "confused", "erm")
+        self.look_at(self.screen)
+        self.wait(3)
+
+class RewriteEquationWithTeacher(AltTeacherStudentScene):
+    def construct(self):
+        equations = VGroup(
+            TexMobject(
+                "f(\\text{2d input})", "", "=", 
+                "g(\\text{2d input})", ""
+            ),
+            TexMobject(
+                "f(\\text{2d input})", "-", 
+                "g(\\text{2d input})", "=", "0"
+            ),
+        )
+        specific_equations = VGroup(
+            TexMobject("x^2", "", "=", "2", ""),
+            TexMobject("x^2", "-", "2", "=", "0"),
+        )
+        for equation in it.chain(equations, specific_equations):
+            equation.sort_submobjects_alphabetically()
+            for part in equation.get_parts_by_tex("text"):
+                part[2:-1].highlight(YELLOW)
+                part[2:-1].scale(0.9)
+            equation.move_to(self.hold_up_spot, DOWN)
+
+        self.teacher_holds_up(specific_equations[0])
+        self.play(Transform(*specific_equations, path_arc = TAU/4))
+        self.play(self.get_student_changes(*["pondering"]*3))
+        self.play(FadeOut(specific_equations[0]), FadeIn(equations[0]))
+        self.wait()
+        self.play(Transform(*equations, path_arc = TAU/4))
+        self.change_student_modes(*["happy"]*3)
+
+        # 2d plane
+        plane = NumberPlane(x_radius = 2.5, y_radius = 2.5)
+        plane.scale(0.8)
+        plane.to_corner(UP+LEFT)
+        plane.add_coordinates()
+
+        dot = Dot(color = YELLOW)
+        label = TextMobject("Sign?")
+        label.add_background_rectangle()
+        label.scale(0.5)
+        label.next_to(dot, UP, SMALL_BUFF)
+        dot.add(label)
+        dot.move_to(plane.coords_to_point(1, 1))
+        dot.save_state()
+        dot.fade(1)
+        dot.center()
+
+        self.student_says(
+            "Wait...what would \\\\ + and \\textminus \\, be in 2d?",
+            target_mode = "sassy",
+            student_index = 2,
+            added_anims = [
+                equations[0].to_corner, UP+RIGHT,
+                self.teacher.change, "plain",
+            ],
+            bubble_kwargs = {"direction" : LEFT},
+        )
+        self.play(
+            Write(plane, run_time = 1),
+            self.students[0].change, "confused",
+            self.students[1].change, "confused",
+        )
+        self.play(dot.restore)
+        for coords in (-1, 1), (1, -1), (0, -2), (-2, 1):
+            self.wait(0.5)
+            self.play(dot.move_to, plane.coords_to_point(*coords))
+        self.wait()
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