From 5aa11cf8adec5d68d657e25306dc7317980f3394 Mon Sep 17 00:00:00 2001
From: Grant Sanderson <grant@3blue1brown.com>
Date: Thu, 17 Jan 2019 14:09:50 -0800
Subject: [PATCH] Fixed a problem where in zooming in, stroke widths all grew

---
 manimlib/camera/camera.py | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/manimlib/camera/camera.py b/manimlib/camera/camera.py
index 96e7c58a..6741288a 100644
--- a/manimlib/camera/camera.py
+++ b/manimlib/camera/camera.py
@@ -392,7 +392,10 @@ class Camera(object):
             vmobject
         )
         ctx.set_line_width(
-            width * self.cairo_line_width_multiple
+            width * self.cairo_line_width_multiple *
+            # This ensures lines have constant width
+            # as you zoom in on them.
+            (self.get_frame_width() / FRAME_WIDTH)
         )
         ctx.stroke_preserve()
         return self