highmap map collection

#!/usr/bin/env node
const fs = require('fs');
const proj4 = require('proj4');

const argvArr = process.argv; //参数
const origialPath = argvArr[2]; // 传入的第一个参数，读取文件
const outPath = argvArr[3]; // 传入的第二个参数，保存文件

fs.readFile(origialPath,"utf-8", (err, data) => {
if(err) {
return console.error("read error: ", err);
}
const originalData = JSON.parse(data);
const transform = originalData["hc-transform"].default;
try{
originalData.features.forEach(feature => {
feature.geometry.coordinates.forEach(coord => {
swap(coord, transform);
})
feature.properties = {
name: [feature.properties.name](http://feature.properties.name/)
}
})
fs.writeFile(outPath, JSON.stringify(originalData), 'utf-8', e => {
if(e) {
return console.error('write error:', e);
} else {
return console.log('write success!')
}
})
} catch(error) {
console.error('no transform :', error);
}
})

function swap(arr, transform){
if(Array.isArray(arr[0])){
arr.forEach(item => {
swap(item, transform)
})
} else {
const temp = pointToLonlat({x: arr[0], y: arr[1]}, transform);
arr[0] = temp.lon;
arr[1] = temp.lat;
}
}

function pointToLonlat(point, transform) {
var normalized = {
x: (
(
point.x -
(transform.jsonmarginX || 0)
) / (transform.jsonres || 1) -
(transform.xpan || 0)
) / (transform.scale || 1) +
(transform.xoffset || 0),
y: -(
(
-point.y + (transform.jsonmarginY || 0)
) / (transform.jsonres || 1) -
(transform.ypan || 0)
) / (transform.scale || 1) +
(transform.yoffset || 0)
},
cosAngle = transform.cosAngle ||
(transform.rotation && Math.cos(transform.rotation)),
sinAngle = transform.sinAngle ||
(transform.rotation && Math.sin(transform.rotation)),
// Note: Inverted sinAngle to reverse rotation direction
projected = proj4(transform.crs, 'WGS84', transform.rotation ? {
x: normalized.x * cosAngle + normalized.y * -sinAngle,
y: normalized.x * sinAngle + normalized.y * cosAngle
} : normalized);
return { lat: projected.y, lon: projected.x };
};