# all files / ol/proj/ epsg3857.js

97.5% Statements 39/40
93.75% Branches 15/16
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97.5% Lines 39/40

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     goog.provide('ol.proj.EPSG3857');

    goog.require('ol');
    goog.require('ol.math');
    goog.require('ol.proj.Projection');
    goog.require('ol.proj.Units');

    /**
     * @classdesc
     * Projection object for web/spherical Mercator (EPSG:3857).
     *
     * @constructor
     * @extends {ol.proj.Projection}
     * @param {string} code Code.
     * @private
     */
    ol.proj.EPSG3857.Projection_ = function(code) {
      ol.proj.Projection.call(this, {
        code: code,
        units: ol.proj.Units.METERS,
        extent: ol.proj.EPSG3857.EXTENT,
        global: true,
        worldExtent: ol.proj.EPSG3857.WORLD_EXTENT,
        getPointResolution: function(resolution, point) {
          return resolution / ol.math.cosh(point[1] / ol.proj.EPSG3857.RADIUS);
        }
      });
    };
    ol.inherits(ol.proj.EPSG3857.Projection_, ol.proj.Projection);

    /**
     * Radius of WGS84 sphere
     *
     * @const
     * @type {number}
     */
    ol.proj.EPSG3857.RADIUS = 6378137;

    /**
     * @const
     * @type {number}
     */
    ol.proj.EPSG3857.HALF_SIZE = Math.PI * ol.proj.EPSG3857.RADIUS;

    /**
     * @const
     * @type {ol.Extent}
     */
    ol.proj.EPSG3857.EXTENT = [
      -ol.proj.EPSG3857.HALF_SIZE, -ol.proj.EPSG3857.HALF_SIZE,
      ol.proj.EPSG3857.HALF_SIZE, ol.proj.EPSG3857.HALF_SIZE
    ];

    /**
     * @const
     * @type {ol.Extent}
     */
    ol.proj.EPSG3857.WORLD_EXTENT = [-180, -85, 180, 85];

    /**
     * Projections equal to EPSG:3857.
     *
     * @const
     * @type {Array.<ol.proj.Projection>}
     */
    ol.proj.EPSG3857.PROJECTIONS = [
      new ol.proj.EPSG3857.Projection_('EPSG:3857'),
      new ol.proj.EPSG3857.Projection_('EPSG:102100'),
      new ol.proj.EPSG3857.Projection_('EPSG:102113'),
      new ol.proj.EPSG3857.Projection_('EPSG:900913'),
      new ol.proj.EPSG3857.Projection_('urn:ogc:def:crs:EPSG:6.18:3:3857'),
      new ol.proj.EPSG3857.Projection_('urn:ogc:def:crs:EPSG::3857'),
      new ol.proj.EPSG3857.Projection_('http://www.opengis.net/gml/srs/epsg.xml#3857')
    ];

    /**
     * Transformation from EPSG:4326 to EPSG:3857.
     *
     * @param {Array.<number>} input Input array of coordinate values.
     * @param {Array.<number>=} opt_output Output array of coordinate values.
     * @param {number=} opt_dimension Dimension (default is `2`).
     * @return {Array.<number>} Output array of coordinate values.
     */
    ol.proj.EPSG3857.fromEPSG4326 = function(input, opt_output, opt_dimension) {
      var length = input.length,
          dimension = opt_dimension > 1 ? opt_dimension : 2,
          output = opt_output;
      if (output === undefined) {
        if (dimension > 2) {
          // preserve values beyond second dimension
          output = input.slice();
        } else {
          output = new Array(length);
        }
      }
      var halfSize = ol.proj.EPSG3857.HALF_SIZE;
      for (var i = 0; i < length; i += dimension) {
        output[i] = halfSize * input[i] / 180;
        var y = ol.proj.EPSG3857.RADIUS *
            Math.log(Math.tan(Math.PI * (input[i + 1] + 90) / 360));
        if (y > halfSize) {
          y = halfSize;
        } else if (y < -halfSize) {
          y = -halfSize;
        }
        output[i + 1] = y;
      }
      return output;
    };

    /**
     * Transformation from EPSG:3857 to EPSG:4326.
     *
     * @param {Array.<number>} input Input array of coordinate values.
     * @param {Array.<number>=} opt_output Output array of coordinate values.
     * @param {number=} opt_dimension Dimension (default is `2`).
     * @return {Array.<number>} Output array of coordinate values.
     */
    ol.proj.EPSG3857.toEPSG4326 = function(input, opt_output, opt_dimension) {
      var length = input.length,
          dimension = opt_dimension > 1 ? opt_dimension : 2,
          output = opt_output;
      if (output === undefined) {
        Iif (dimension > 2) {
          // preserve values beyond second dimension
          output = input.slice();
        } else {
          output = new Array(length);
        }
      }
      for (var i = 0; i < length; i += dimension) {
        output[i] = 180 * input[i] / ol.proj.EPSG3857.HALF_SIZE;
        output[i + 1] = 360 * Math.atan(
            Math.exp(input[i + 1] / ol.proj.EPSG3857.RADIUS)) / Math.PI - 90;
      }
      return output;
    };