kepler.gl/src/utils/dist/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.MAPBOX_TILE_SIZE = void 0;
exports.getCenterAndZoomFromBounds = getCenterAndZoomFromBounds;
exports.normalizeEvent = normalizeEvent;
exports.validateBounds = validateBounds;
var _geoViewport = _interopRequireDefault(require("@mapbox/geo-viewport"));
var _console = _interopRequireDefault(require("global/console"));
// SPDX-License-Identifier: MIT
// Copyright contributors to the kepler.gl project

var MAPBOX_TILE_SIZE = exports.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
  };
}

/**
 * Add extra info about screen space position and world position to the event.
 * @param {*} event Event to normalize.
 * @param {*} viewport Current viewport.
 * @returns Normalized event with extra information compatible with React-map-gl MapLayerMouseEvent
 * https://visgl.github.io/react-map-gl/docs/api-reference/types#maplayermouseevent
 */
function normalizeEvent(event, viewport) {
  var _event$target;
  var bounds = (_event$target = event.target) === null || _event$target === void 0 ? void 0 : _event$target.getBoundingClientRect();
  if (!bounds) {
    return event;
  }
  var x = event.clientX - bounds.left;
  var y = event.clientY - bounds.top;
  if (!Number.isFinite(x) || !Number.isFinite(y)) {
    return event;
  }
  event.point = [x, y];
  var location = viewport.unproject(event.point, {
    targetZ: 0
  });
  event.lngLat = [location[0], location[1]];
  return event;
}
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