From f5c23aff81824903be0af81ae876e4e015cc02d5 Mon Sep 17 00:00:00 2001
From: rht <rhtbot@protonmail.com>
Date: Wed, 28 Feb 2024 21:32:35 -0500
Subject: [PATCH] Remove JupyterViz Altair marker overlap for huge grid size

---
 mesa/experimental/components/altair.py | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/mesa/experimental/components/altair.py b/mesa/experimental/components/altair.py
index 2b08485b848..a66e4ab09ae 100644
--- a/mesa/experimental/components/altair.py
+++ b/mesa/experimental/components/altair.py
@@ -56,5 +56,10 @@ def portray(g):
         .properties(width=280, height=280)
         # .configure_view(strokeOpacity=0)  # hide grid/chart lines
     )
+    # This is the default value for the marker size, which auto-scales
+    # according to the grid area.
+    if not has_size:
+        length = min(space.width, space.height)
+        chart = chart.mark_point(size=30000 / length**2, filled=True)
 
     return chart