online-map-download

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online-map-download

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在线下载XYZ地图瓦片

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### 技术选型

Vue3 + element-plus + jszip + OpenLayers

此项目在UI部分基于项目：[xiaolidan00/offline-map-download: 纯前端离线瓦片地图下载 (github.com)](https://github.com/xiaolidan00/offline-map-download)的UI进行修改

## 使用

此项目的在线地址为：[在线瓦片地图下载](https://zhnny.github.io/online-map-download/)

打开网站，输入XYZ瓦片的地址（默认的是ArcGIS的在线遥感影像），然后点击加载瓦片

![image-20240430131459052](https://s2.loli.net/2024/04/30/wutUQd2ABvocK4i.png)

点击“划范围”，然后开始绘制多边形，双击完成绘制，自动计算瓦片范围（红色矩形部分）

![image-20240430131526197](https://s2.loli.net/2024/04/30/59yfLFeSZ4BN6uj.png)

点击“下载”，打开下载信息界面，勾选需要下载的级别

![image-20240430131556040](https://s2.loli.net/2024/04/30/mCO5hxk7rDcpP9s.png)

点击下载，弹出信息提示框

![image-20240430131619333](https://s2.loli.net/2024/04/30/MLXOosjbyEatWlT.png)

开始下载，等待下载完成

![image-20240430131659188](https://s2.loli.net/2024/04/30/lKpCcnyWIfjRzQr.png)

下载完成，打开压缩包查看瓦片

![image-20240430131732990](https://s2.loli.net/2024/04/30/bwmFfvtX48MT9zs.png)

### 核心代码

```javascript
function lon2tile(lon, zoom) {
  return (Math.floor((lon + 180) / 360 * Math.pow(2, zoom)));
}

function lat2tile(lat, zoom) {
  return (Math.floor((1 - Math.log(Math.tan(lat * Math.PI / 180) + 1 / Math.cos(lat * Math.PI / 180)) / Math.PI) / 2 * Math.pow(2, zoom)));
}

function download() {
  const latlngMin = toLonLat([rect.value[0], rect.value[3]]);
  const latlngMax = toLonLat([rect.value[2], rect.value[1]]);

const list = [];
  for (let z = 0; z < 20; z++) {
    const xMin = lon2tile(latlngMin[0], z);
    const yMin = lat2tile(latlngMin[1], z);
    const xMax = lon2tile(latlngMax[0], z);
    const yMax = lat2tile(latlngMax[1], z);

if (zoomMap.value[z]) {
      for (let x = xMin; x <= xMax; x++) {
        for (let y = yMin; y <= yMax; y++) {
          list.push({ x, y, z });
        }
      }
    }
  }
  downloadTiles(list);
}

async function downloadTiles(list) {
  isLoading.value = true;
  const total = list.length;
  let count = 0;
  let zip = new JSZip();
  for (let i = 0; i < list.length; i += 6) {
    let promises = [];
    if (i + 6 > list.length) {
      promises = list.slice(i, list.length).map(async (item) => {
        const blob = await downloadTile(item.x, item.y, item.z)
        zip.file(`${item.z}/${item.y}/${item.x}.png`, blob);
        count++;
        process.value = ((count / total) * 100).toFixed(2);
      });
    } else {
      promises = list.slice(i, i + 6).map(async (item) => {
        const blob = await downloadTile(item.x, item.y, item.z)
        zip.file(`${item.z}/${item.y}/${item.x}.png`, blob);
        count++;
        process.value = ((count / total) * 100).toFixed(2);
      });
    }
    await Promise.all(promises);
  }
}

### 网站部署

使用GitHub Actions和GitHub Pages进行打包部署此Vue3项目

具体的步骤可参考：[使用GitHub Actions和GitHub pages实现前端项目的自动打包部署 - 当时明月在曾照彩云归 - 博客园 (cnblogs.com)](https://www.cnblogs.com/jiujiubashiyi/p/18151965)

此项目的GitHub地址为：[zhnny/online-map-download: 在线下载XYZ地图瓦片 (github.com)](https://github.com/zhnny/online-map-download)

此项目的在线地址为：[在线瓦片地图下载](https://zhnny.github.io/online-map-download/)

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