goog.provide('ol.geom.Point');

goog.require('goog.asserts');
goog.require('ol.extent');
goog.require('ol.geom.GeometryType');
goog.require('ol.geom.SimpleGeometry');
goog.require('ol.geom.flat');
goog.require('ol.geom.flat.deflate');
goog.require('ol.math');



/**
 * @constructor
 * @extends {ol.geom.SimpleGeometry}
 * @param {ol.geom.RawPoint} coordinates Coordinates.
 * @param {ol.geom.GeometryLayout=} opt_layout Layout.
 * @todo stability experimental
 */
ol.geom.Point = function(coordinates, opt_layout) {
  goog.base(this);
  this.setCoordinates(coordinates, opt_layout);
};
goog.inherits(ol.geom.Point, ol.geom.SimpleGeometry);


/**
 * @inheritDoc
 */
ol.geom.Point.prototype.clone = function() {
  var point = new ol.geom.Point(null);
  point.setFlatCoordinates(this.layout, this.flatCoordinates.slice());
  return point;
};


/**
 * @inheritDoc
 */
ol.geom.Point.prototype.closestPointXY =
    function(x, y, closestPoint, minSquaredDistance) {
  var flatCoordinates = this.flatCoordinates;
  var squaredDistance = ol.math.squaredDistance(
      x, y, flatCoordinates[0], flatCoordinates[1]);
  if (squaredDistance < minSquaredDistance) {
    var stride = this.stride;
    var i;
    for (i = 0; i < stride; ++i) {
      closestPoint[i] = flatCoordinates[i];
    }
    closestPoint.length = stride;
    return squaredDistance;
  } else {
    return minSquaredDistance;
  }
};


/**
 * @return {ol.geom.RawPoint} Coordinates.
 * @todo stability experimental
 */
ol.geom.Point.prototype.getCoordinates = function() {
  return this.flatCoordinates.slice();
};


/**
 * @inheritDoc
 */
ol.geom.Point.prototype.getExtent = function(opt_extent) {
  if (this.extentRevision != this.getRevision()) {
    this.extent = ol.extent.createOrUpdateFromCoordinate(
        this.flatCoordinates, this.extent);
    this.extentRevision = this.getRevision();
  }
  goog.asserts.assert(goog.isDef(this.extent));
  return ol.extent.returnOrUpdate(this.extent, opt_extent);
};


/**
 * @inheritDoc
 */
ol.geom.Point.prototype.getType = function() {
  return ol.geom.GeometryType.POINT;
};


/**
 * @param {ol.geom.RawPoint} coordinates Coordinates.
 * @param {ol.geom.GeometryLayout=} opt_layout Layout.
 * @todo stability experimental
 */
ol.geom.Point.prototype.setCoordinates = function(coordinates, opt_layout) {
  if (goog.isNull(coordinates)) {
    this.setFlatCoordinates(ol.geom.GeometryLayout.XY, null);
  } else {
    this.setLayout(opt_layout, coordinates, 0);
    if (goog.isNull(this.flatCoordinates)) {
      this.flatCoordinates = [];
    }
    this.flatCoordinates.length = ol.geom.flat.deflate.coordinate(
        this.flatCoordinates, 0, coordinates, this.stride);
    this.dispatchChangeEvent();
  }
};


/**
 * @param {ol.geom.GeometryLayout} layout Layout.
 * @param {Array.<number>} flatCoordinates Flat coordinates.
 */
ol.geom.Point.prototype.setFlatCoordinates = function(layout, flatCoordinates) {
  this.setFlatCoordinatesInternal(layout, flatCoordinates);
  this.dispatchChangeEvent();
};