From 374f916b3ac2b5755cb35deec34b27e3ba9a3da5 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=C3=89ric=20Lemoine?= <eric.lemoine@gmail.com>
Date: Mon, 15 Dec 2014 17:30:57 +0100
Subject: [PATCH] Add ol.geom.flat.transform.translate

---
 src/ol/geom/flat/transformflatgeom.js         | 31 ++++++++++++++++++-
 ...mflatgeom.js => transformflatgeom.test.js} | 16 ++++++++++
 2 files changed, 46 insertions(+), 1 deletion(-)
 rename test/spec/ol/geom/flat/{transformflatgeom.js => transformflatgeom.test.js} (83%)

diff --git a/src/ol/geom/flat/transformflatgeom.js b/src/ol/geom/flat/transformflatgeom.js
index 574c8bcd33..7bb08e8a83 100644
--- a/src/ol/geom/flat/transformflatgeom.js
+++ b/src/ol/geom/flat/transformflatgeom.js
@@ -22,7 +22,7 @@ ol.geom.flat.transform.transform2D =
   var m13 = goog.vec.Mat4.getElement(transform, 1, 3);
   var dest = goog.isDef(opt_dest) ? opt_dest : [];
   var i = 0;
-  var j, jj;
+  var j;
   for (j = offset; j < end; j += stride) {
     var x = flatCoordinates[j];
     var y = flatCoordinates[j + 1];
@@ -34,3 +34,32 @@ ol.geom.flat.transform.transform2D =
   }
   return dest;
 };
+
+
+/**
+ * @param {Array.<number>} flatCoordinates Flat coordinates.
+ * @param {number} offset Offset.
+ * @param {number} end End.
+ * @param {number} stride Stride.
+ * @param {number} deltaX Delta X.
+ * @param {number} deltaY Delta Y.
+ * @param {Array.<number>=} opt_dest Destination.
+ * @return {Array.<number>} Transformed coordinates.
+ */
+ol.geom.flat.transform.translate =
+    function(flatCoordinates, offset, end, stride, deltaX, deltaY, opt_dest) {
+  var dest = goog.isDef(opt_dest) ? opt_dest : [];
+  var i = 0;
+  var j, k;
+  for (j = offset; j < end; j += stride) {
+    dest[i++] = flatCoordinates[j] + deltaX;
+    dest[i++] = flatCoordinates[j + 1] + deltaY;
+    for (k = j + 2; k < j + stride; ++k) {
+      dest[i++] = flatCoordinates[k];
+    }
+  }
+  if (goog.isDef(opt_dest) && dest.length != i) {
+    dest.length = i;
+  }
+  return dest;
+};
diff --git a/test/spec/ol/geom/flat/transformflatgeom.js b/test/spec/ol/geom/flat/transformflatgeom.test.js
similarity index 83%
rename from test/spec/ol/geom/flat/transformflatgeom.js
rename to test/spec/ol/geom/flat/transformflatgeom.test.js
index dd3689bd52..c661116a88 100644
--- a/test/spec/ol/geom/flat/transformflatgeom.js
+++ b/test/spec/ol/geom/flat/transformflatgeom.test.js
@@ -62,6 +62,22 @@ describe('ol.geom.flat.transform', function() {
 
   });
 
+  describe('ol.geom.flat.transform.translate', function() {
+    it('translates the coordinates array', function() {
+      var multiPolygon = new ol.geom.MultiPolygon([
+        [[[0, 0, 2], [0, 1, 2], [1, 1, 2], [1, 0, 2], [0, 0, 2]]],
+        [[[2, 2, 3], [2, 3, 3], [3, 3, 3], [3, 2, 3], [2, 2, 3]]]]);
+      var flatCoordinates = multiPolygon.getFlatCoordinates();
+      var deltaX = 1;
+      var deltaY = 2;
+      ol.geom.flat.transform.translate(flatCoordinates, 0,
+          flatCoordinates.length, multiPolygon.getStride(),
+          deltaX, deltaY, flatCoordinates);
+      expect(flatCoordinates).to.eql([
+        1, 2, 2, 1, 3, 2, 2, 3, 2, 2, 2, 2, 1, 2, 2,
+        3, 4, 3, 3, 5, 3, 4, 5, 3, 4, 4, 3, 3, 4, 3]);
+    });
+  });
 
 });