From 04b4c1dad8f10e9e98b53f7e3b9d9e8429ac059e Mon Sep 17 00:00:00 2001
From: Grant Sanderson <grant@3blue1brown.com>
Date: Mon, 11 Feb 2019 13:22:22 -0800
Subject: [PATCH] Get rid of ContinualRotation

---
 .../continual_animation.py                    | 21 -------------------
 old_projects/WindingNumber_G.py               |  2 +-
 old_projects/div_curl.py                      |  9 +++-----
 old_projects/mug.py                           |  5 +++--
 4 files changed, 7 insertions(+), 30 deletions(-)

diff --git a/manimlib/continual_animation/continual_animation.py b/manimlib/continual_animation/continual_animation.py
index 9717c0a7..5552047f 100644
--- a/manimlib/continual_animation/continual_animation.py
+++ b/manimlib/continual_animation/continual_animation.py
@@ -70,27 +70,6 @@ class ContinualAnimationGroup(ContinualAnimation):
             continual_animation.update(dt)
 
 
-class ContinualRotation(ContinualAnimation):
-    CONFIG = {
-        "axis": OUT,
-        "rate": np.pi / 12,  # Radians per second
-        "in_place": True,
-        "about_point": None,
-    }
-
-    def update_mobject(self, dt):
-        if self.about_point:
-            about_point = self.about_point
-        elif self.in_place:
-            about_point = self.mobject.get_center()
-        else:
-            about_point = ORIGIN
-        self.mobject.rotate(
-            dt * self.rate, axis=self.axis,
-            about_point=about_point
-        )
-
-
 class ContinualMovement(ContinualAnimation):
     CONFIG = {
         "direction": RIGHT,
diff --git a/old_projects/WindingNumber_G.py b/old_projects/WindingNumber_G.py
index 07d13b4d..52284387 100644
--- a/old_projects/WindingNumber_G.py
+++ b/old_projects/WindingNumber_G.py
@@ -1144,7 +1144,7 @@ class TwoDScreenInOurThreeDWorld(AltTeacherStudentsScene, ThreeDScene):
             run_time = 4,
             added_anims = [MoveToTarget(everything, run_time = 4)],
         )
-        self.add(ContinualRotation(everything, axis = UP, rate = 3*DEGREES))
+        always_rotate(everything, axis=UP, rate=3 * DEGREES)
         self.wait(10)
 
 class EveryOutputPointHasAColor(ColorMappedObjectsScene):
diff --git a/old_projects/div_curl.py b/old_projects/div_curl.py
index 71ab0ecc..0bdb62fd 100644
--- a/old_projects/div_curl.py
+++ b/old_projects/div_curl.py
@@ -2406,11 +2406,9 @@ class IntroduceCurl(IntroduceVectorField):
                 label.add_background_rectangle()
                 label.next_to(arrows, DOWN)
                 self.add_foreground_mobjects(label)
-                self.add(ContinualRotation(
-                    arrows, rate=u * 30 * DEGREES
-                ))
+                always_rotate(arrows, rate=u * 30 * DEGREES)
                 self.play(
-                    VFadeIn(arrows),
+                    FadeIn(arrows),
                     FadeIn(label)
                 )
         self.wait(2)
@@ -2488,9 +2486,8 @@ class ShearCurl(IntroduceCurl):
         )
         twig.add(Dot(twig.get_center()))
         twig.move_to(circle)
-        twig_rotation = ContinualRotation(
+        always_rotate(
             twig, rate=-90 * DEGREES,
-            start_up_time=8,
         )
 
         self.play(FadeInFrom(twig, UP))
diff --git a/old_projects/mug.py b/old_projects/mug.py
index e2eceda6..1120064c 100644
--- a/old_projects/mug.py
+++ b/old_projects/mug.py
@@ -288,7 +288,7 @@ class AboutToyPuzzles(UtilitiesPuzzleScene, TeacherStudentsScene, ThreeDScene):
             eulers.get_bottom(),
             color = WHITE
         )
-        self.add(ContinualRotation(cube, axis = UP))
+        always_rotate(cube, axis=UP)
         self.play(
             GrowArrow(arrow_to_eulers),
             Write(eulers),
@@ -1879,7 +1879,8 @@ class EulersFormulaForGeneralPlanarGraph(LightUpNodes, ThreeDScene):
         self.play(FadeOut(self.vertices))
         self.play(ReplacementTransform(regions, cube, run_time = 2))
         cube.sort(lambda p : -p[2])
-        self.add(ContinualRotation(cube, axis = UP, in_place = False))
+        always_rotate(cube, axis=UP, about_point=ORIGIN)
+        self.add(cube)
         self.wait(3)
         self.play(
             FadeOut(self.top_formula),