openlayers/src/ol/geom/flat/segments.js

Build tools and sources for developing OpenLayers based mapping applications

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(this: S, ol.Coordinate, ol.Coordinate): T} callback Function
 *     called for each segment.
 * @param {S=} opt_this The object to be used as the value of 'this'
 *     within callback.
 * @return {T|boolean} Value.
 * @template T,S
 */
ol.geom.flat.segments.forEach = function(flatCoordinates, offset, end, stride, callback, opt_this) {
  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.call(opt_this, point1, point2);
    if (ret) {
      return ret;
    }
    point1[0] = point2[0];
    point1[1] = point2[1];
  }
  return false;
};