From 8f17628190b603f243c81e04fc2efb518be49800 Mon Sep 17 00:00:00 2001
From: Tom MacWright <tom@macwright.org>
Date: Tue, 5 Feb 2013 19:09:22 -0500
Subject: [PATCH] Support nudging while moving ways. Fixes #533

---
 js/id/modes/move_way.js | 42 ++++++++++++++++++++++++++++++++++-------
 1 file changed, 35 insertions(+), 7 deletions(-)

diff --git a/js/id/modes/move_way.js b/js/id/modes/move_way.js
index 986eef5bd..e21dded78 100644
--- a/js/id/modes/move_way.js
+++ b/js/id/modes/move_way.js
@@ -6,7 +6,8 @@ iD.modes.MoveWay = function(context, wayId) {
     var keybinding = d3.keybinding('move-way');
 
     mode.enter = function() {
-        var origin = point(),
+        var origin = context.map().mouseCoordinates(),
+            nudgeInterval,
             annotation = t('operations.move.annotation.' + context.geometry(wayId));
 
         // If intiated via keyboard
@@ -16,17 +17,44 @@ iD.modes.MoveWay = function(context, wayId) {
             iD.actions.Noop(),
             annotation);
 
+        function edge(point, size) {
+            var pad = [30, 100, 30, 100];
+            if (point[0] > size[0] - pad[0]) return [-10, 0];
+            else if (point[0] < pad[2]) return [10, 0];
+            else if (point[1] > size[1] - pad[1]) return [0, -10];
+            else if (point[1] < pad[3]) return [0, 10];
+            return null;
+        }
+
+        function startNudge(nudge) {
+            if (nudgeInterval) window.clearInterval(nudgeInterval);
+            nudgeInterval = window.setInterval(function() {
+                context.map().pan(nudge).redraw();
+            }, 50);
+        }
+
+        function stopNudge() {
+            if (nudgeInterval) window.clearInterval(nudgeInterval);
+            nudgeInterval = null;
+        }
+
         function point() {
-            return d3.mouse(context.surface().node());
+            return d3.mouse(context.map().surface.node());
         }
 
         function move() {
-            var p = point(),
-                delta = origin ?
-                    [p[0] - origin[0], p[1] - origin[1]] :
-                    [0, 0];
+            var p = point();
 
-            origin = p;
+            var delta = origin ?
+                [p[0] - context.projection(origin)[0],
+                p[1] - context.projection(origin)[1]] :
+                [0, 0];
+
+            var nudge = edge(p, context.map().size());
+            if (nudge) startNudge(nudge);
+            else stopNudge();
+
+            origin = context.map().mouseCoordinates();
 
             context.replace(
                 iD.actions.MoveWay(wayId, delta, context.projection),