From 495cef1691f28564b93669d165fb867c35e68238 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Laura=20Kl=C3=BCnder?= <laura@codingcatgirl.de>
Date: Mon, 30 Oct 2017 21:25:56 +0100
Subject: [PATCH] render 257x257px tiles so they can overlap to avoid rendering
 bugs

---
 src/c3nav/mapdata/views.py | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/src/c3nav/mapdata/views.py b/src/c3nav/mapdata/views.py
index d1f03690..fd0975f6 100644
--- a/src/c3nav/mapdata/views.py
+++ b/src/c3nav/mapdata/views.py
@@ -32,6 +32,10 @@ def tile(request, level, zoom, x, y, format):
     maxx = minx + size
     maxy = miny + size
 
+    # add one pixel so tiles can overlap to avoid rendering bugs in chrome or webkit
+    maxx += size / 256
+    miny -= size / 256
+
     # error 404 if tiles is out of bounds
     bounds = Source.max_bounds()
     if not box(*chain(*bounds)).intersects(box(minx, miny, maxx, maxy)):