Factor out ol.geom.flat.center

2014-03-12 13:22:19 +01:00
parent ca44c6328c
commit 48af6ecd1c
3 changed files with 28 additions and 26 deletions
@@ -0,0 +1,26 @@
+goog.provide('ol.geom.flat.center');
+
+goog.require('ol.extent');
+
+
+/**
+ * @param {Array.<number>} flatCoordinates Flat coordinates.
+ * @param {number} offset Offset.
+ * @param {Array.<Array.<number>>} endss Endss.
+ * @param {number} stride Stride.
+ * @return {Array.<number>} Flat centers.
+ */
+ol.geom.flat.center.linearRingss =
+    function(flatCoordinates, offset, endss, stride) {
+  var flatCenters = [];
+  var i, ii;
+  var extent = ol.extent.createEmpty();
+  for (i = 0, ii = endss.length; i < ii; ++i) {
+    var ends = endss[i];
+    extent = ol.extent.createOrUpdateFromFlatCoordinates(
+        flatCoordinates, offset, ends[0], stride);
+    flatCenters.push((extent[0] + extent[2]) / 2, (extent[1] + extent[3]) / 2);
+    offset = ends[ends.length - 1];
+  }
+  return flatCenters;
+};