Add ol.geom.flat.segments.forEach

src/ol/geom/flat/segmentsflatgeom.js

@@ -0,0 +1,33 @@
+goog.provide('ol.geom.flat.segments');
+
+
+/**
+ * This function calls `callback` for each segment of the flat coordinates
+ * array. If the callback returns a truthy value the function returns that
+ * value immediately. Otherwise the function returns `false`.
+ * @param {Array.<number>} flatCoordinates Flat coordinates.
+ * @param {number} offset Offset.
+ * @param {number} end End.
+ * @param {number} stride Stride.
+ * @param {function(ol.Coordinate, ol.Coordinate): T} callback Function
+ *     called for each segment.
+ * @return {T|boolean} Value.
+ * @template T
+ */
+ol.geom.flat.segments.forEach =
+    function(flatCoordinates, offset, end, stride, callback) {
+  var point1 = [flatCoordinates[offset], flatCoordinates[offset + 1]];
+  var point2 = [];
+  var ret;
+  for (; (offset + stride) < end; offset += stride) {
+    point2[0] = flatCoordinates[offset + stride];
+    point2[1] = flatCoordinates[offset + stride + 1];
+    ret = callback(point1, point2);
+    if (ret) {
+      return ret;
+    }
+    point1[0] = point2[0];
+    point1[1] = point2[1];
+  }
+  return false;
+};