From 6b09da380da6b7e0ea1f1a23ca070157458a29cf Mon Sep 17 00:00:00 2001
From: Ansis Brammanis <ansis.brammanis@gmail.com>
Date: Fri, 11 Jan 2013 16:56:28 -0500
Subject: [PATCH] only getComputedTextLength() once

---
 js/id/svg/lines.js | 14 +++++++++-----
 1 file changed, 9 insertions(+), 5 deletions(-)

diff --git a/js/id/svg/lines.js b/js/id/svg/lines.js
index a183f4aea..713432b8b 100644
--- a/js/id/svg/lines.js
+++ b/js/id/svg/lines.js
@@ -1,10 +1,14 @@
 iD.svg.Lines = function() {
-    return function(surface, graph, entities, filter, projection) {
-        var arrowtext = '►\u3000\u3000',
-            arrow = surface.append('text').text(arrowtext),
-            alength = arrow.node().getComputedTextLength();
 
-        arrow.remove();
+        var arrowtext = '►\u3000\u3000',
+            alength;
+
+    return function(surface, graph, entities, filter, projection) {
+        if (!alength) {
+            var arrow = surface.append('text').text(arrowtext);
+            alength = arrow.node().getComputedTextLength();
+            arrow.remove();
+        }
 
         var lines = [];