agneta-platform/services/lib/gis/esri-tiles.js

Agneta Platform - Integrate and customize business applications

/*   Copyright 2017 Agneta Network Applications, LLC.
 *
 *   Source file: services/lib/gis/esri-tiles.js
 *
 *   Licensed under the Apache License, Version 2.0 (the "License");
 *   you may not use this file except in compliance with the License.
 *   You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 *   Unless required by applicable law or agreed to in writing, software
 *   distributed under the License is distributed on an "AS IS" BASIS,
 *   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *   See the License for the specific language governing permissions and
 *   limitations under the License.
 */
const Promise = require('bluebird');
const _ = require('lodash');
const geolib = require('geolib');

module.exports = function(app, options) {

  var defaultQuery = {
    returnGeometry: 'true',
    where: '1=1',
    outFields: options.fields || '*',
    geometryType: 'esriGeometryEnvelope',
    spatialRel: 'esriSpatialRelIntersects',
    geometryPrecision: '6',
  };

  function tile(geometry) {

    return Promise.resolve()
      .then(function() {

        if (options.maxDistance) {

          var distance = geolib.getDistance({
            latitude: geometry.xmin,
            longitude: geometry.ymin
          }, {
            latitude: geometry.xmax,
            longitude: geometry.ymax
          });

          if (distance > options.maxDistance) {
            return {
              error: 'Exceeded distance'
            };
          }

        }

        _.extend(geometry, {
          spatialReference: {
            wkid: 4326
          }
        });
        var query = _.extend({
          geometry: JSON.stringify(geometry)
        }, defaultQuery);
        //console.log(query,req.query);
        return app.gis.esri.query(query);

      });


  }

  return tile;

};