src/coord/geo/fix/nanhai.ts

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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
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* to you under the Apache License, Version 2.0 (the
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*
*   http://www.apache.org/licenses/LICENSE-2.0
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// Fix for 南海诸岛

import * as zrUtil from 'zrender/src/core/util';
import { GeoJSONRegion } from '../Region';

const geoCoord = [126, 25];
const nanhaiName = '南海诸岛';

const points = [
    [[0, 3.5], [7, 11.2], [15, 11.9], [30, 7], [42, 0.7], [52, 0.7],
        [56, 7.7], [59, 0.7], [64, 0.7], [64, 0], [5, 0], [0, 3.5]],
    [[13, 16.1], [19, 14.7], [16, 21.7], [11, 23.1], [13, 16.1]],
    [[12, 32.2], [14, 38.5], [15, 38.5], [13, 32.2], [12, 32.2]],
    [[16, 47.6], [12, 53.2], [13, 53.2], [18, 47.6], [16, 47.6]],
    [[6, 64.4], [8, 70], [9, 70], [8, 64.4], [6, 64.4]],
    [[23, 82.6], [29, 79.8], [30, 79.8], [25, 82.6], [23, 82.6]],
    [[37, 70.7], [43, 62.3], [44, 62.3], [39, 70.7], [37, 70.7]],
    [[48, 51.1], [51, 45.5], [53, 45.5], [50, 51.1], [48, 51.1]],
    [[51, 35], [51, 28.7], [53, 28.7], [53, 35], [51, 35]],
    [[52, 22.4], [55, 17.5], [56, 17.5], [53, 22.4], [52, 22.4]],
    [[58, 12.6], [62, 7], [63, 7], [60, 12.6], [58, 12.6]],
    [[0, 3.5], [0, 93.1], [64, 93.1], [64, 0], [63, 0], [63, 92.4],
        [1, 92.4], [1, 3.5], [0, 3.5]]
];

for (let i = 0; i < points.length; i++) {
    for (let k = 0; k < points[i].length; k++) {
        points[i][k][0] /= 10.5;
        points[i][k][1] /= -10.5 / 0.75;

        points[i][k][0] += geoCoord[0];
        points[i][k][1] += geoCoord[1];
    }
}

export default function fixNanhai(mapType: string, regions: GeoJSONRegion[]) {
    if (mapType === 'china') {
        for (let i = 0; i < regions.length; i++) {
            // Already exists.
            if (regions[i].name === nanhaiName) {
                return;
            }
        }

        regions.push(new GeoJSONRegion(
            nanhaiName,
            zrUtil.map(points, function (exterior) {
                return {
                    type: 'polygon',
                    exterior: exterior
                };
            }), geoCoord
        ));
    }
}