From 3c5983c78cd7d6851cbcba54a97c91bbfb4742f3 Mon Sep 17 00:00:00 2001
From: Eric Gillingham <Gillingham@bikezen.net>
Date: Wed, 10 Jul 2013 18:02:15 -0700
Subject: [PATCH] Add a new moveTo function to range to allow a program to
 recenter the timeline on any given date.

---
 src/timeline/Range.js | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)

diff --git a/src/timeline/Range.js b/src/timeline/Range.js
index 9f02fe69..ae9b43af 100644
--- a/src/timeline/Range.js
+++ b/src/timeline/Range.js
@@ -522,3 +522,19 @@ Range.prototype.move = function(moveFactor) {
     this.start = newStart;
     this.end = newEnd;
 };
+
+/**
+ * Move the range to a new center point
+ * @param {Number} moveTo      New center point of the range
+ */
+Range.prototype.moveTo = function(moveTo) {
+    var center = (this.start + this.end) / 2;
+
+    var diff = center - moveTo;
+
+    // calculate new start and end
+    var newStart = this.start - diff;
+    var newEnd = this.end - diff;
+
+    this.setRange(newStart, newEnd);
+}