@visactor/vchart/esm/series/map/geo-source.js

charts lib based @visactor/VGrammar

import { DataSet, DataView, geoJSONParser, simplify, topoJSONParser } from "@visactor/vdataset";

import { warn } from "../../util/debug";

import { registerDataSetInstanceParser, registerDataSetInstanceTransform } from "../../data/register";

import { isObject, merge } from "@visactor/vutils";

export const geoSourceMap = new Map;

let mapDataSet;

function initMapDataSet() {
    mapDataSet || (mapDataSet = new DataSet, registerDataSetInstanceParser(mapDataSet, "geojson", geoJSONParser), 
    registerDataSetInstanceParser(mapDataSet, "topojson", topoJSONParser), registerDataSetInstanceTransform(mapDataSet, "simplify", simplify));
}

export function registerMapSource(key, source, option = {
    type: "geojson",
    centroid: !0
}) {
    geoSourceMap.has(key) && warn(`map type of '${key}' already exists, will be overwritten.`), 
    initMapDataSet();
    const dataView = new DataView(mapDataSet), options = merge({}, {
        centroid: !0,
        simplify: !1
    }, option);
    "topojson" === option.type ? dataView.parse(source, {
        type: "topojson",
        options: options
    }) : dataView.parse(source, {
        type: "geojson",
        options: options
    });
    const {simplify: simplify} = option;
    !0 === simplify ? dataView.transform({
        type: "simplify"
    }) : isObject(simplify) && dataView.transform({
        type: "simplify",
        options: simplify
    }), geoSourceMap.set(key, dataView);
}

export function unregisterMapSource(key) {
    geoSourceMap.has(key) ? geoSourceMap.delete(key) : warn(`map type of '${key}' does not exists.`);
}

export function getMapSource(type) {
    return geoSourceMap.get(type);
}

export function clearMapSource() {
    geoSourceMap.clear(), mapDataSet = null;
}
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