本地化程序

.gitignore

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+.DS_Store
+node_modules/
+baseMap/*
+/dist/
+npm-debug.log*
+yarn-debug.log*
+yarn-error.log*
+/test/unit/coverage/
+/test/e2e/reports/
+selenium-debug.log
+
+# Editor directories and files
+.idea
+.vscode
+*.suo
+*.ntvs*
+*.njsproj
+*.sln

README.md

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+# 4DMap
+
+
+## Run Setup
+
+``` bash
+# install dependencies
+npm install
+
+# serve with hot reload at localhost:8080
+node index
+
+
+```

index.js

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+const childProcess = require('child_process')
+const cpuNum = 18
+
+for (let i = 0; i < cpuNum; ++i) {
+  let worker = childProcess.fork('./worker.js')
+  worker.send(i + 1)
+}

worker.js

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+const fs = require('fs')
+const request = require('request')
+const path = require('path')
+const dirPath = path.join(__dirname, "baseMap");
+
+function checkLocal(zoom, x, y) {
+  return new Promise(resolve => {
+    fs.exists(`${dirPath}/${zoom}_${x}_${y}.png`, resolve)
+  })
+}
+
+
+const downImage = (function() {
+  let count = 0
+  const domains = [
+    'http://a.tile.openstreetmap.org',
+    'http://b.tile.openstreetmap.org',
+    'http://c.tile.openstreetmap.org'
+  ]
+  const length = domains.length
+
+  return async function downImage(zoom, x, y) {
+    count++;
+
+    let url = domains[count % length] + `/${zoom}/${x}/${y}.png`
+    let local = `${dirPath}/${zoom}_${x}_${y}.png`
+
+    return new Promise(resolve => {
+      try {
+        let readStream = request(url)
+        let writeStream = fs.createWriteStream(local)
+
+        readStream.on('error', errorHandle)
+
+        function errorHandle(err) {
+          console.error(err)
+          resolve()
+        }
+ 
+        readStream.pipe(writeStream)
+          .on('close', err => {
+            if (err) {
+              console.error(url + '文件下载失败')
+            } else {
+              console.log(url + '文件下载成功')
+            }
+            resolve()
+          })
+          .on('error', errorHandle)
+      } catch (e) {
+        resolve()
+        console.error(e)
+      }
+    })
+  }
+})();
+
+async function cache(...args) {
+  if (!(await checkLocal(...args))) {
+    await downImage(...args)
+  }
+}
+
+let setting = {
+  1: {
+    minX: -1,
+    maxX: 5,
+    minY: -1,
+    maxY: 5
+  },
+  2: {
+    minX: -1,
+    maxX: 10,
+    minY: -1,
+    maxY: 10
+  },
+  3: {
+    minX: -1,
+    maxX: 20,
+    minY: -1,
+    maxY: 20
+  },
+  9: {
+    minX: 200,
+    maxX: 600,
+    maxY: 100,
+    maxY: 400
+  },
+  10: {
+    minX: 500,
+    maxX: 1100,
+    minY: 200,
+    maxY: 600
+  },
+  11: {
+    minX: 1200,
+    maxX: 2000,
+    minY: 400,
+    maxY: 1200
+  },
+  12: {
+    minX: 2300,
+    maxX: 4300,
+    minY: 1500,
+    maxY: 2100
+  },
+  13: {
+    minX: 4600,
+    maxX: 8600,
+    minY: 2000,
+    maxY: 4000
+  },
+  14: {
+    minX: 10000,
+    maxX: 16600,
+    minY: 5000,
+    maxY: 8000
+  },
+  15: {
+    minX: 23000,
+    maxX: 29000,
+    minY: 10000,
+    maxY: 16000
+  },
+  16: {
+    minX: 40000,
+    maxX: 60000,
+    minY: 23000,
+    maxY: 31000
+  },
+  17: {
+    minX: 80000,
+    maxX: 120000,
+    minY: 50000,
+    maxY: 62000
+  },
+  18: {
+    minX: 200000,
+    maxX: 233000,
+    minY: 80000,
+    maxY: 130000
+  },
+  19: {
+    minX: 380000,
+    maxX: 470000,
+    minY: 180000,
+    maxY: 250000
+  }
+}
+
+process.on('message', async msg => {
+  let zoom = Number(msg)
+
+  console.log(zoom)
+  let {minX, maxX, minY, maxY} = setting[zoom]
+  // let min = parseInt(basic / 4)
+  // let maxX = basic * 10
+  // let maxY = maxX / 1.5
+  let total = (maxX - minX) * (maxY - minY)
+  let count = 0
+
+  for (let x = maxX; x > minX; x--) {
+    for (let y = minY; y < maxY && y < x;) {
+      let run = y + 100 < maxY ? 100 : maxY - y
+      let pros = []
+      for (let h = 0; h < run; h++) {
+        count++
+        pros.push(cache(zoom, x, y + h))
+      }
+      await Promise.all(pros)
+      y += run
+      console.log('层级' + zoom + '总共' + total + '已下载' + count)
+    }
+  }
+
+
+  fs.writeFileSync('./log.text', fs.readFileSync('./log.text') + '\r\n' + '层级' + zoom + '已下载完毕')
+})