# all files / ol/tilegrid/ wmtstilegrid.js

95.56% Statements 43/45
66.67% Branches 4/6
83.33% Functions 5/6
95.56% Lines 43/45

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     goog.provide('ol.tilegrid.WMTS');

    goog.require('goog.asserts');
    goog.require('ol.proj');
    goog.require('ol.tilegrid.TileGrid');

    /**
     * @classdesc
     * Set the grid pattern for sources accessing WMTS tiled-image servers.
     *
     * @constructor
     * @extends {ol.tilegrid.TileGrid}
     * @param {olx.tilegrid.WMTSOptions} options WMTS options.
     * @struct
     * @api
     */
    ol.tilegrid.WMTS = function(options) {

      goog.asserts.assert(
          options.resolutions.length == options.matrixIds.length,
          'options resolutions and matrixIds must have equal length (%s == %s)',
          options.resolutions.length, options.matrixIds.length);

      /**
       * @private
       * @type {!Array.<string>}
       */
      this.matrixIds_ = options.matrixIds;
      // FIXME: should the matrixIds become optionnal?

      goog.base(this, {
        extent: options.extent,
        origin: options.origin,
        origins: options.origins,
        resolutions: options.resolutions,
        tileSize: options.tileSize,
        tileSizes: options.tileSizes,
        sizes: options.sizes
      });

    };
    goog.inherits(ol.tilegrid.WMTS, ol.tilegrid.TileGrid);

    /**
     * @param {number} z Z.
     * @return {string} MatrixId..
     */
    ol.tilegrid.WMTS.prototype.getMatrixId = function(z) {
      goog.asserts.assert(0 <= z && z < this.matrixIds_.length,
          'attempted to retrive matrixId for illegal z (%s)', z);
      return this.matrixIds_[z];
    };

    /**
     * Get the list of matrix identifiers.
     * @return {Array.<string>} MatrixIds.
     * @api
     */
    ol.tilegrid.WMTS.prototype.getMatrixIds = function() {
      return this.matrixIds_;
    };

    /**
     * Create a tile grid from a WMTS capabilities matrix set.
     * @param {Object} matrixSet An object representing a matrixSet in the
     *     capabilities document.
     * @param {ol.Extent=} opt_extent An optional extent to restrict the tile
     *     ranges the server provides.
     * @return {ol.tilegrid.WMTS} WMTS tileGrid instance.
     * @api
     */
    ol.tilegrid.WMTS.createFromCapabilitiesMatrixSet =
        function(matrixSet, opt_extent) {

      /** @type {!Array.<number>} */
      var resolutions = [];
      /** @type {!Array.<string>} */
      var matrixIds = [];
      /** @type {!Array.<ol.Coordinate>} */
      var origins = [];
      /** @type {!Array.<ol.Size>} */
      var tileSizes = [];
      /** @type {!Array.<ol.Size>} */
      var sizes = [];

      var supportedCRSPropName = 'SupportedCRS';
      var matrixIdsPropName = 'TileMatrix';
      var identifierPropName = 'Identifier';
      var scaleDenominatorPropName = 'ScaleDenominator';
      var topLeftCornerPropName = 'TopLeftCorner';
      var tileWidthPropName = 'TileWidth';
      var tileHeightPropName = 'TileHeight';

      var projection;
      projection = ol.proj.get(matrixSet[supportedCRSPropName].replace(
          /urn:ogc:def:crs:(\w+):(.*:)?(\w+)$/, '$1:$3'));
      var metersPerUnit = projection.getMetersPerUnit();
      // swap origin x and y coordinates if axis orientation is lat/long
      var switchOriginXY = projection.getAxisOrientation().substr(0, 2) == 'ne';

      matrixSet[matrixIdsPropName].sort(function(a, b) {
        return b[scaleDenominatorPropName] - a[scaleDenominatorPropName];
      });

      matrixSet[matrixIdsPropName].forEach(function(elt, index, array) {
        matrixIds.push(elt[identifierPropName]);
        var resolution = elt[scaleDenominatorPropName] * 0.28E-3 / metersPerUnit;
        var tileWidth = elt[tileWidthPropName];
        var tileHeight = elt[tileHeightPropName];
        Iif (switchOriginXY) {
          origins.push([elt[topLeftCornerPropName][1],
            elt[topLeftCornerPropName][0]]);
        } else {
          origins.push(elt[topLeftCornerPropName]);
        }
        resolutions.push(resolution);
        tileSizes.push(tileWidth == tileHeight ?
            tileWidth : [tileWidth, tileHeight]);
        // top-left origin, so height is negative
        sizes.push([elt['MatrixWidth'], -elt['MatrixHeight']]);
      });

      return new ol.tilegrid.WMTS({
        extent: opt_extent,
        origins: origins,
        resolutions: resolutions,
        matrixIds: matrixIds,
        tileSizes: tileSizes,
        sizes: sizes
      });
    };