geoJSONLoader.js
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/*
* 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 {each} from 'zrender/src/core/util';
import parseGeoJson from './parseGeoJson';
import {makeInner} from '../../util/model';
// Built-in GEO fixer.
import fixNanhai from './fix/nanhai';
import fixTextCoord from './fix/textCoord';
import fixGeoCoord from './fix/geoCoord';
import fixDiaoyuIsland from './fix/diaoyuIsland';
var inner = makeInner();
export default {
/**
* @param {string} mapName
* @param {Object} mapRecord {specialAreas, geoJSON}
* @return {Object} {regions, boundingRect}
*/
load: function (mapName, mapRecord) {
var parsed = inner(mapRecord).parsed;
if (parsed) {
return parsed;
}
var specialAreas = mapRecord.specialAreas || {};
var geoJSON = mapRecord.geoJSON;
var regions;
// https://jsperf.com/try-catch-performance-overhead
try {
regions = geoJSON ? parseGeoJson(geoJSON) : [];
}
catch (e) {
throw new Error('Invalid geoJson format\n' + e.message);
}
each(regions, function (region) {
var regionName = region.name;
fixTextCoord(mapName, region);
fixGeoCoord(mapName, region);
fixDiaoyuIsland(mapName, region);
// Some area like Alaska in USA map needs to be tansformed
// to look better
var specialArea = specialAreas[regionName];
if (specialArea) {
region.transformTo(
specialArea.left, specialArea.top, specialArea.width, specialArea.height
);
}
});
fixNanhai(mapName, regions);
return (inner(mapRecord).parsed = {
regions: regions,
boundingRect: getBoundingRect(regions)
});
}
};
function getBoundingRect(regions) {
var rect;
for (var i = 0; i < regions.length; i++) {
var regionRect = regions[i].getBoundingRect();
rect = rect || regionRect.clone();
rect.union(regionRect);
}
return rect;
}