superset geo 源码
superset geo 代码
文件路径：/superset-frontend/plugins/legacy-preset-chart-deckgl/src/utils/geo.js
/**
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you 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.
*/
import { roundDecimal } from './utils';
export const defaultViewport = {
bearing: 0,
latitude: 31.222656842808707,
longitude: 6.85236157047845,
pitch: 0,
zoom: 1,
};
const METER_TO_MILE = 1609.34;
export function unitToRadius(unit, num) {
if (unit === 'square_m') {
return Math.sqrt(num / Math.PI);
}
if (unit === 'radius_m') {
return num;
}
if (unit === 'radius_km') {
return num * 1000;
}
if (unit === 'radius_miles') {
return num * METER_TO_MILE;
}
if (unit === 'square_km') {
return Math.sqrt(num / Math.PI) * 1000;
}
if (unit === 'square_miles') {
return Math.sqrt(num / Math.PI) * METER_TO_MILE;
}
return null;
}
export const EARTH_CIRCUMFERENCE_KM = 40075.16;
export const MILES_PER_KM = 1.60934;
export function kmToPixels(kilometers, latitude, zoomLevel) {
// Algorithm from: https://wiki.openstreetmap.org/wiki/Zoom_levels
const latitudeRad = latitude * (Math.PI / 180);
// Seems like the zoomLevel is off by one
const kmPerPixel =
(EARTH_CIRCUMFERENCE_KM * Math.cos(latitudeRad)) / 2 ** (zoomLevel + 9);
return roundDecimal(kilometers / kmPerPixel, 2);
}
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