From 57cfe50ec7df6ba532fb72adcea9ce65374c117e Mon Sep 17 00:00:00 2001
From: John Firebaugh <john.firebaugh@gmail.com>
Date: Tue, 27 Aug 2013 17:28:28 -0700
Subject: [PATCH] Support {-y} notation

---
 js/id/renderer/background_source.js | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/js/id/renderer/background_source.js b/js/id/renderer/background_source.js
index 2e9c23025..b8041a2d3 100644
--- a/js/id/renderer/background_source.js
+++ b/js/id/renderer/background_source.js
@@ -21,7 +21,7 @@ iD.BackgroundSource = function(data) {
             .replace('{x}', coord[0])
             .replace('{y}', coord[1])
             // TMS-flipped y coordinate
-            .replace('{ty}', Math.pow(2, coord[2]) - coord[1] - 1)
+            .replace(/\{[t-]y\}/, Math.pow(2, coord[2]) - coord[1] - 1)
             .replace(/\{z(oom)?\}/, coord[2])
             .replace(/\{switch:([^}]+)\}/, function(s, r) {
                 var subdomains = r.split(',');