kepler.gl/dist/utils/projection-utils.js

kepler.gl is a webgl based application to visualize large scale location data in the browser

"use strict";

var _interopRequireDefault = require("@babel/runtime/helpers/interopRequireDefault");

Object.defineProperty(exports, "__esModule", {
  value: true
});
exports.validateBounds = validateBounds;
exports.getCenterAndZoomFromBounds = getCenterAndZoomFromBounds;

var _geoViewport = _interopRequireDefault(require("@mapbox/geo-viewport"));

var _console = _interopRequireDefault(require("global/console"));

// Copyright (c) 2021 Uber Technologies, Inc.
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.
var MAPBOX_TILE_SIZE = 512;

function isLat(num) {
  return Number.isFinite(num) && num <= 90 && num >= -90;
}

function isLng(num) {
  return Number.isFinite(num) && num <= 180 && num >= -180;
}
/**
 * bounds should be [minLng, minLat, maxLng, maxLat]
 * @param {*} bounds
 */


function validateBounds(bounds) {
  // array: [ -180, -85.05112877980659, 180, 85.0511287798066 ]
  // validate bounds
  if (Array.isArray(bounds) && bounds.length === 4 && [bounds[0], bounds[2]].every(isLng) && [bounds[1], bounds[3]].every(isLat)) {
    return bounds;
  }

  return null;
}

function getCenterAndZoomFromBounds(bounds, _ref) {
  var width = _ref.width,
      height = _ref.height;
  var validBounds = validateBounds(bounds);

  if (!validBounds) {
    _console["default"].warn('invalid map bounds provided');

    return null;
  } // viewport(bounds, dimensions, minzoom, maxzoom, tileSize, allowFloat)


  var _geoViewport$viewport = _geoViewport["default"].viewport(bounds, [width, height], undefined, undefined, MAPBOX_TILE_SIZE),
      zoom = _geoViewport$viewport.zoom; // center being calculated by geo-vieweport.viewport has a complex logic that
  // projects and then unprojects the coordinates to determine the center
  // Calculating a simple average instead as that is the expected behavior in most of cases


  var center = [(bounds[0] + bounds[2]) / 2, (bounds[1] + bounds[3]) / 2];
  return {
    zoom: zoom,
    center: center
  };
}
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