From 486c201a219508628de0617fc44102e148afa0db Mon Sep 17 00:00:00 2001
From: Ansis Brammanis <ansis.brammanis@gmail.com>
Date: Fri, 11 Jan 2013 13:39:14 -0500
Subject: [PATCH] Fix jerk after dragging

---
 js/id/renderer/map.js | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/js/id/renderer/map.js b/js/id/renderer/map.js
index 6ba2a6551..10be8f13a 100644
--- a/js/id/renderer/map.js
+++ b/js/id/renderer/map.js
@@ -29,6 +29,9 @@ iD.Map = function() {
         surface = supersurface.append('svg')
             .on('mouseup.reset-transform', resetTransform)
             .on('touchend.reset-transform', resetTransform)
+            .on('mousedown.drag', function() {
+                translateStart = projection.translate();
+            })
             .on('mousedown.zoom', function() {
                 if (d3.event.button == 2) {
                     d3.event.stopPropagation();
@@ -128,7 +131,6 @@ iD.Map = function() {
             .translate(d3.event.translate)
             .scale(d3.event.scale);
         if (fast) {
-            if (!translateStart) translateStart = d3.event.translate.slice();
             var a = d3.event.translate,
                 b = translateStart,
                 translate = 'translate(' + ~~(a[0] - b[0]) + 'px,' +