@globalfishingwatch/react-map-gl/dist/esm/utils/transition/linear-interpolator.js

A React wrapper for MapboxGL-js and overlay API.

import _slicedToArray from "@babel/runtime/helpers/esm/slicedToArray";
import _classCallCheck from "@babel/runtime/helpers/esm/classCallCheck";
import _createClass from "@babel/runtime/helpers/esm/createClass";
import _assertThisInitialized from "@babel/runtime/helpers/esm/assertThisInitialized";
import _inherits from "@babel/runtime/helpers/esm/inherits";
import _possibleConstructorReturn from "@babel/runtime/helpers/esm/possibleConstructorReturn";
import _getPrototypeOf from "@babel/runtime/helpers/esm/getPrototypeOf";
import _defineProperty from "@babel/runtime/helpers/esm/defineProperty";

function _createForOfIteratorHelper(o, allowArrayLike) { var it; if (typeof Symbol === "undefined" || o[Symbol.iterator] == null) { if (Array.isArray(o) || (it = _unsupportedIterableToArray(o)) || allowArrayLike && o && typeof o.length === "number") { if (it) o = it; var i = 0; var F = function F() {}; return { s: F, n: function n() { if (i >= o.length) return { done: true }; return { done: false, value: o[i++] }; }, e: function e(_e) { throw _e; }, f: F }; } throw new TypeError("Invalid attempt to iterate non-iterable instance.\nIn order to be iterable, non-array objects must have a [Symbol.iterator]() method."); } var normalCompletion = true, didErr = false, err; return { s: function s() { it = o[Symbol.iterator](); }, n: function n() { var step = it.next(); normalCompletion = step.done; return step; }, e: function e(_e2) { didErr = true; err = _e2; }, f: function f() { try { if (!normalCompletion && it["return"] != null) it["return"](); } finally { if (didErr) throw err; } } }; }

function _unsupportedIterableToArray(o, minLen) { if (!o) return; if (typeof o === "string") return _arrayLikeToArray(o, minLen); var n = Object.prototype.toString.call(o).slice(8, -1); if (n === "Object" && o.constructor) n = o.constructor.name; if (n === "Map" || n === "Set") return Array.from(o); if (n === "Arguments" || /^(?:Ui|I)nt(?:8|16|32)(?:Clamped)?Array$/.test(n)) return _arrayLikeToArray(o, minLen); }

function _arrayLikeToArray(arr, len) { if (len == null || len > arr.length) len = arr.length; for (var i = 0, arr2 = new Array(len); i < len; i++) { arr2[i] = arr[i]; } return arr2; }

function _createSuper(Derived) { var hasNativeReflectConstruct = _isNativeReflectConstruct(); return function _createSuperInternal() { var Super = _getPrototypeOf(Derived), result; if (hasNativeReflectConstruct) { var NewTarget = _getPrototypeOf(this).constructor; result = Reflect.construct(Super, arguments, NewTarget); } else { result = Super.apply(this, arguments); } return _possibleConstructorReturn(this, result); }; }

function _isNativeReflectConstruct() { if (typeof Reflect === "undefined" || !Reflect.construct) return false; if (Reflect.construct.sham) return false; if (typeof Proxy === "function") return true; try { Boolean.prototype.valueOf.call(Reflect.construct(Boolean, [], function () {})); return true; } catch (e) { return false; } }

import WebMercatorViewport from 'viewport-mercator-project';
import assert from '../assert';
import TransitionInterpolator from './transition-interpolator';
import { isValid, getEndValueByShortestPath } from './transition-utils';
import { lerp } from '../math-utils';
var VIEWPORT_TRANSITION_PROPS = ['longitude', 'latitude', 'zoom', 'bearing', 'pitch'];

var LinearInterpolator = function (_TransitionInterpolat) {
  _inherits(LinearInterpolator, _TransitionInterpolat);

  var _super = _createSuper(LinearInterpolator);

  function LinearInterpolator() {
    var _this;

    var opts = arguments.length > 0 && arguments[0] !== undefined ? arguments[0] : {};

    _classCallCheck(this, LinearInterpolator);

    _this = _super.call(this);

    _defineProperty(_assertThisInitialized(_this), "around", void 0);

    if (Array.isArray(opts)) {
      opts = {
        transitionProps: opts
      };
    }

    _this.propNames = opts.transitionProps || VIEWPORT_TRANSITION_PROPS;

    if (opts.around) {
      _this.around = opts.around;
    }

    return _this;
  }

  _createClass(LinearInterpolator, [{
    key: "initializeProps",
    value: function initializeProps(startProps, endProps) {
      var startViewportProps = {};
      var endViewportProps = {};

      if (this.around) {
        startViewportProps.around = this.around;
        var aroundLngLat = new WebMercatorViewport(startProps).unproject(this.around);
        Object.assign(endViewportProps, endProps, {
          around: new WebMercatorViewport(endProps).project(aroundLngLat),
          aroundLngLat: aroundLngLat
        });
      }

      var _iterator = _createForOfIteratorHelper(this.propNames),
          _step;

      try {
        for (_iterator.s(); !(_step = _iterator.n()).done;) {
          var key = _step.value;
          var startValue = startProps[key];
          var endValue = endProps[key];
          assert(isValid(startValue) && isValid(endValue), "".concat(key, " must be supplied for transition"));
          startViewportProps[key] = startValue;
          endViewportProps[key] = getEndValueByShortestPath(key, startValue, endValue);
        }
      } catch (err) {
        _iterator.e(err);
      } finally {
        _iterator.f();
      }

      return {
        start: startViewportProps,
        end: endViewportProps
      };
    }
  }, {
    key: "interpolateProps",
    value: function interpolateProps(startProps, endProps, t) {
      var viewport = {};

      var _iterator2 = _createForOfIteratorHelper(this.propNames),
          _step2;

      try {
        for (_iterator2.s(); !(_step2 = _iterator2.n()).done;) {
          var key = _step2.value;
          viewport[key] = lerp(startProps[key], endProps[key], t);
        }
      } catch (err) {
        _iterator2.e(err);
      } finally {
        _iterator2.f();
      }

      if (endProps.around) {
        var _WebMercatorViewport$ = new WebMercatorViewport(Object.assign({}, endProps, viewport)).getMapCenterByLngLatPosition({
          lngLat: endProps.aroundLngLat,
          pos: lerp(startProps.around, endProps.around, t)
        }),
            _WebMercatorViewport$2 = _slicedToArray(_WebMercatorViewport$, 2),
            longitude = _WebMercatorViewport$2[0],
            latitude = _WebMercatorViewport$2[1];

        viewport.longitude = longitude;
        viewport.latitude = latitude;
      }

      return viewport;
    }
  }]);

  return LinearInterpolator;
}(TransitionInterpolator);

export { LinearInterpolator as default };
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