kepler.gl/src/layers/dist/vector-tile/common-tile/tile-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.getPropertyByZoom = getPropertyByZoom;
exports.isDomainQuantiles = isDomainQuantiles;
exports.isDomainStops = isDomainStops;
exports.isIndexedField = isIndexedField;
exports.pruneQuantiles = pruneQuantiles;
var _typeof2 = _interopRequireDefault(require("@babel/runtime/helpers/typeof"));
var _d3Array = require("d3-array");
// SPDX-License-Identifier: MIT
// Copyright contributors to the kepler.gl project

// helper functions
function isDomainStops(domain) {
  return (0, _typeof2["default"])(domain) === 'object' && domain !== null && Array.isArray(domain.stops) && Array.isArray(domain.z);
}
function isDomainQuantiles(domain) {
  return (0, _typeof2["default"])(domain) === 'object' && domain !== null && Array.isArray(domain.quantiles) && Array.isArray(domain.z);
}
function isIndexedField(field) {
  return Boolean(field && field.indexBy);
}
function getPropertyByZoom(config, defaultValue) {
  if (!config || !config.enabled || !Array.isArray(config.stops)) {
    return function () {
      return defaultValue;
    };
  }
  var stops = config.stops;
  var zSteps = stops.map(function (st) {
    return st[0];
  });
  return function (zoom) {
    var i = (0, _d3Array.bisectLeft)(zSteps, zoom);
    if (i === 0) {
      return stops[i][1];
    }
    return stops[i - 1][1];
  };
}

/**
 * Remove null/0 values from the bottom of the quantiles. If the column has many nulls
 * or 0s at the bottom of the quantiles, it will wash out color scales and produce
 * meaningless "no value" legend entries. We want to keep the first 0 and no others.
 * Operates in place.
 */
function pruneQuantiles(quantiles) {
  var firstNonZeroIdx = quantiles.findIndex(function (d) {
    return d !== null && d !== 0;
  });
  if (firstNonZeroIdx > 0) {
    quantiles.splice(0, firstNonZeroIdx - 1);
  }
}
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QUVILGVBQWUsR0FBRyxDQUFDLENBQUM7RUFDMUM7QUFDRiIsImlnbm9yZUxpc3QiOltdfQ==