From 901d40ba1144290f682d112342da43733477dd1f Mon Sep 17 00:00:00 2001
From: Grant Sanderson <grant@3blue1brown.com>
Date: Sat, 28 Jan 2023 22:53:56 -0800
Subject: [PATCH] Fix scroll zooming

---
 manimlib/scene/scene.py | 10 ++++------
 1 file changed, 4 insertions(+), 6 deletions(-)

diff --git a/manimlib/scene/scene.py b/manimlib/scene/scene.py
index d9bc273a..ab096b77 100644
--- a/manimlib/scene/scene.py
+++ b/manimlib/scene/scene.py
@@ -25,6 +25,7 @@ from manimlib.constants import DEFAULT_WAIT_TIME
 from manimlib.constants import COMMAND_MODIFIER
 from manimlib.constants import SHIFT_MODIFIER
 from manimlib.constants import RED
+from manimlib.constants import FRAME_HEIGHT
 from manimlib.event_handler import EVENT_DISPATCHER
 from manimlib.event_handler.event_type import EventType
 from manimlib.logger import log
@@ -871,14 +872,11 @@ class Scene(object):
             return
 
         frame = self.camera.frame
-        offset *= self.scroll_sensitivity
         if self.window.is_key_pressed(ord(ZOOM_KEY)):
-            frame.scale(
-                1 - offset[1] / frame.get_height(),
-                about_point=point
-            )
+            ff_offset = offset * FRAME_HEIGHT / frame.get_height()
+            frame.scale(1 - ff_offset[1], about_point=point)
         else:
-            frame.shift(-offset)
+            frame.shift(-self.scroll_sensitivity * offset)
 
     def on_key_release(
         self,