/*
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* Licensed to the Apache Software Foundation (ASF) under one
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* or more contributor license agreements. See the NOTICE file
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* distributed with this work for additional information
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* regarding copyright ownership. The ASF licenses this file
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* to you under the Apache License, Version 2.0 (the
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* "License"); you may not use this file except in compliance
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* with the License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing,
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* software distributed under the License is distributed on an
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* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
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* KIND, either express or implied. See the License for the
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* specific language governing permissions and limitations
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* under the License.
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*/
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/**
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* Parse and decode geo json
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*/
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import * as zrUtil from 'zrender/src/core/util';
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import { GeoJSONRegion } from './Region';
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import { GeoJSONCompressed, GeoJSON } from './geoTypes';
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function decode(json: GeoJSONCompressed | GeoJSON): GeoJSON {
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if (!(json as GeoJSONCompressed).UTF8Encoding) {
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return json as GeoJSON;
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}
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const jsonCompressed = json as GeoJSONCompressed;
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let encodeScale = jsonCompressed.UTF8Scale;
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if (encodeScale == null) {
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encodeScale = 1024;
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}
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const features = jsonCompressed.features;
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for (let f = 0; f < features.length; f++) {
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const feature = features[f];
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const geometry = feature.geometry;
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if (geometry.type === 'Polygon') {
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const coordinates = geometry.coordinates;
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for (let c = 0; c < coordinates.length; c++) {
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coordinates[c] = decodePolygon(
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coordinates[c],
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geometry.encodeOffsets[c],
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encodeScale
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) as any;
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}
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}
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else if (geometry.type === 'MultiPolygon') {
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const coordinates = geometry.coordinates;
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for (let c = 0; c < coordinates.length; c++) {
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const coordinate = coordinates[c];
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for (let c2 = 0; c2 < coordinate.length; c2++) {
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coordinate[c2] = decodePolygon(
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coordinate[c2],
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geometry.encodeOffsets[c][c2],
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encodeScale
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) as any;
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}
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}
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}
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}
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// Has been decoded
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jsonCompressed.UTF8Encoding = false;
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return jsonCompressed as GeoJSON;
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}
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function decodePolygon(
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coordinate: string,
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encodeOffsets: number[],
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encodeScale: number
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): number[][] {
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const result = [];
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let prevX = encodeOffsets[0];
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let prevY = encodeOffsets[1];
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for (let i = 0; i < coordinate.length; i += 2) {
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let x = coordinate.charCodeAt(i) - 64;
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let y = coordinate.charCodeAt(i + 1) - 64;
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// ZigZag decoding
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x = (x >> 1) ^ (-(x & 1));
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y = (y >> 1) ^ (-(y & 1));
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// Delta deocding
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x += prevX;
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y += prevY;
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prevX = x;
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prevY = y;
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// Dequantize
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result.push([x / encodeScale, y / encodeScale]);
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}
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return result;
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}
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export default function parseGeoJSON(geoJson: GeoJSON | GeoJSONCompressed, nameProperty: string): GeoJSONRegion[] {
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geoJson = decode(geoJson);
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return zrUtil.map(zrUtil.filter(geoJson.features, function (featureObj) {
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// Output of mapshaper may have geometry null
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return featureObj.geometry
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&& featureObj.properties
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&& featureObj.geometry.coordinates.length > 0;
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}), function (featureObj) {
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const properties = featureObj.properties;
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const geo = featureObj.geometry;
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const geometries = [] as GeoJSONRegion['geometries'];
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if (geo.type === 'Polygon') {
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const coordinates = geo.coordinates;
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geometries.push({
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type: 'polygon',
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// According to the GeoJSON specification.
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// First must be exterior, and the rest are all interior(holes).
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exterior: coordinates[0],
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interiors: coordinates.slice(1)
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});
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}
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if (geo.type === 'MultiPolygon') {
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const coordinates = geo.coordinates;
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zrUtil.each(coordinates, function (item) {
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if (item[0]) {
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geometries.push({
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type: 'polygon',
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exterior: item[0],
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interiors: item.slice(1)
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});
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}
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});
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}
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const region = new GeoJSONRegion(
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properties[nameProperty || 'name'],
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geometries,
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properties.cp
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);
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region.properties = properties;
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return region;
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});
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}
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