From 1712560c6e62339339e2172061561e044f9ffd34 Mon Sep 17 00:00:00 2001
From: Richard Davey <rdavey@gmail.com>
Date: Tue, 3 Jan 2017 22:31:02 +0000
Subject: [PATCH] Added Point.GetCentroid.

---
 v3/src/geom/point/GetCentroid.js | 38 ++++++++++++++++++++++++++++++++
 v3/src/geom/point/index.js       |  1 +
 2 files changed, 39 insertions(+)
 create mode 100644 v3/src/geom/point/GetCentroid.js

diff --git a/v3/src/geom/point/GetCentroid.js b/v3/src/geom/point/GetCentroid.js
new file mode 100644
index 000000000..5964c18c6
--- /dev/null
+++ b/v3/src/geom/point/GetCentroid.js
@@ -0,0 +1,38 @@
+var Point = require('./Point');
+
+var GetCentroid = function (points, out)
+{
+    if (out === undefined) { out = new Point(); }
+
+    if (!Array.isArray(points))
+    {
+        throw new Error('GetCentroid points argument must be an array');
+    }
+
+    var len = points.length;
+
+    if (len < 1)
+    {
+        throw new Error('GetCentroid points array must not be empty');
+    }
+    else if (len === 1)
+    {
+        out.x = points[0].x;
+        out.y = points[0].y;
+    }
+    else
+    {
+        for (var i = 0; i < len; i++)
+        {
+            out.x += points[i].x;
+            out.y += points[i].y;
+        }
+
+        out.x /= len;
+        out.y /= len;
+    }
+
+    return out;
+};
+
+module.exports = GetCentroid;
diff --git a/v3/src/geom/point/index.js b/v3/src/geom/point/index.js
index a31c21b3c..c1c59199b 100644
--- a/v3/src/geom/point/index.js
+++ b/v3/src/geom/point/index.js
@@ -11,6 +11,7 @@ Point.Divide = require('./Divide');
 Point.Dot = require('./Dot');
 Point.Equals = require('./Equals');
 Point.Floor = require('./Floor');
+Point.GetCentroid = require('./GetCentroid');
 Point.GetMagnitude = require('./GetMagnitude');
 Point.GetMagnitudeSq = require('./GetMagnitudeSq');
 Point.Interpolate = require('./Interpolate');