From f0dc92dc2dd7c666bd84c23f20c3774c10b46a7b Mon Sep 17 00:00:00 2001
From: Paul Ramsey <pramsey@cleverelephant.ca>
Date: Fri, 27 Mar 2020 14:08:44 -0700
Subject: [PATCH] Use uint in bit shift, closes #27

---
 tile.go | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tile.go b/tile.go
index 5252bb0..38a6069 100644
--- a/tile.go
+++ b/tile.go
@@ -36,7 +36,7 @@ func makeTile(vars map[string]string) (Tile, error) {
 }
 
 func (tile *Tile) Width() float64 {
-	worldTileSize := int(1) << tile.Zoom
+	worldTileSize := int(1) << uint(tile.Zoom)
 	return worldMercWidth / float64(worldTileSize)
 }