02_tiles_and_images.js

// 示例 2：构造瓦片/WMS/缩略图 URL，并抓一张缩略图保存到本地。
//
// 用法：
//   node 02_tiles_and_images.js [mapid] [version]
'use strict';

const fs = require('node:fs');
const path = require('node:path');
const { makeClient, sampleMapid, sampleVersion } = require('./_common');

(async () => {
  const svc = makeClient();
  const mapid = process.argv[2] || sampleMapid();
  const version = process.argv[3] || sampleVersion();

  console.log(`== 地图 ${mapid}/${version} ==`);

  const raster = svc.rasterTileUrl({ mapid, version, layer: '0' });
  console.log('raster tile URL:\n ', raster);

  const vector = svc.vectorTileUrl({ mapid, version });
  console.log('vector tile URL:\n ', vector);

  const wms = svc.wmsTileUrl({ mapid, version, width: 512, height: 512 });
  console.log('WMS tile URL:\n ', wms);

  const thumbUrl = svc.thumbnailUrl(mapid, version, { width: 256, height: 256 });
  console.log('thumbnail URL:\n ', thumbUrl);

  const buf = await svc.thumbnailBytes(mapid, version, { width: 256, height: 256 });
  const out = path.join(__dirname, `_thumb_${mapid}_${version}.png`);
  fs.writeFileSync(out, buf);
  console.log(`缩略图已保存：${path.basename(out)}  (${buf.length} bytes)`);
})().catch((e) => {
  console.error('失败：', e.body || e.message || e);
  process.exit(1);
});