From 331c906c8e17ccf5b8a62154c6cc9e80dea97d87 Mon Sep 17 00:00:00 2001
From: Grant Sanderson <grantsanderson7@gmail.com>
Date: Wed, 8 Mar 2017 15:19:12 -0800
Subject: [PATCH] Just starting SlopeOfCircleExample

---
 eoc/chapter5.py | 120 +++++++++++++++++++++++++++++++++++++++++++++---
 1 file changed, 113 insertions(+), 7 deletions(-)

diff --git a/eoc/chapter5.py b/eoc/chapter5.py
index 3fea8a94..28c85e48 100644
--- a/eoc/chapter5.py
+++ b/eoc/chapter5.py
@@ -25,15 +25,121 @@ from camera import Camera
 from mobject.svg_mobject import *
 from mobject.tex_mobject import *
 
-from eoc.chapter1 import OpeningQuote, PatreonThanks
+from topics.common_scenes import *
 from eoc.graph_scene import *
 
-class Chapter3OpeningQuote(OpeningQuote):
+SPACE_UNIT_TO_PLANE_UNIT = 0.7
+
+class Chapter5OpeningQuote(OpeningQuote):
     CONFIG = {
         "quote" : [
-            "Using the chain rule is like peeling an onion: ",
-            "you have to deal with each layer at a time, and ",
-            "if it is too big you will start crying."
+            "Do not ask whether a ",
+            "statement is true until",
+            "you know what it means."
         ],
-        "author" : "(Anonymous professor)"
-    }
\ No newline at end of file
+        "author" : "Errett Bishop"
+    }
+
+class ThisWasConfusing(TeacherStudentsScene):
+    def construct(self):
+        words = TextMobject("Implicit differentiation")
+        words.move_to(self.get_teacher().get_corner(UP+LEFT), DOWN+RIGHT)
+        words.set_fill(opacity = 0)
+
+        self.play(
+            self.get_teacher().change_mode, "raise_right_hand",
+            words.set_fill, None, 1,
+            words.shift, 0.5*UP
+        )
+        self.change_student_modes(
+            *["confused"]*3,
+            look_at_arg = words,
+            added_anims = [Animation(self.get_teacher())]
+        )
+        self.dither()
+        self.play(
+            self.get_teacher().change_mode, "confused",
+            self.get_teacher().look_at, words,
+        )
+        self.dither(3)
+
+class SlopeOfCircleExample(ZoomedScene):
+    CONFIG = {
+        "plane_kwargs" : {
+            "x_radius" : SPACE_WIDTH/SPACE_UNIT_TO_PLANE_UNIT,
+            "y_radius" : SPACE_HEIGHT/SPACE_UNIT_TO_PLANE_UNIT,
+            "space_unit_to_x_unit" : SPACE_UNIT_TO_PLANE_UNIT,
+            "space_unit_to_y_unit" : SPACE_UNIT_TO_PLANE_UNIT,
+        },
+        "example_point" : (3, 4),
+    }
+    def construct(self):
+        should_skip_animations = self.skip_animations
+        self.skip_animations = True
+
+
+        self.skip_animations = should_skip_animations
+        self.setup_plane()
+        self.introduce_circle()
+        self.talk_through_pythagorean_theorem()
+        self.draw_example_slope()
+        self.show_perpendicular_radius()
+        self.show_dx_and_dy()
+        self.point_out_this_is_not_a_graph()
+        self.perform_implicit_derivative()
+        self.show_rearrangement()
+        self.show_final_slope()
+
+    def setup_plane(self):
+        self.plane = NumberPlane(**self.plane_kwargs)
+        self.plane.main_lines.fade()
+
+        self.plane.add(self.plane.get_axis_labels())
+        self.plane.add_coordinates()
+
+        self.add(self.plane)
+
+    def introduce_circle(self):
+        pass
+
+    def talk_through_pythagorean_theorem(self):
+        pass
+
+    def draw_example_slope(self):
+        pass
+
+    def show_perpendicular_radius(self):
+        pass
+
+    def show_dx_and_dy(self):
+        pass
+
+    def point_out_this_is_not_a_graph(self):
+        pass
+
+    def perform_implicit_derivative(self):
+        pass
+
+    def show_rearrangement(self):
+        pass
+
+    def show_final_slope(self):
+        pass
+
+
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