Java调用echarts提供的地图压缩方法来压缩地图

时间：2022-10-07 21:24:32

由于默认情况下的 geojson 文件太大，echarts 提供了方法可以压缩地图。

geojson 介绍：http://geojson.org/

echarts 提供了压缩算法，但是代码是 javascript 的，参考代码写个 java 的也可以，但是通过 java 提供的脚本引擎可以很方便的直接执行 js。

本文压缩代码参考下面的项目：

https://github.com/giscafer/mapshaper-plus
这里的算法也是来源于 echarts

从该项目提取出压缩地图的 js 代码，简化后如下：

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function convert2echarts(rawstr,filename,type){
  var results="";
  var json = json.parse(rawstr);
  // meta tag
  json.utf8encoding = true;
  var features = json.features;
  if (!features) {
    return;
  }
  features.foreach(function (feature){
    var encodeoffsets = feature.geometry.encodeoffsets = [];
    var coordinates = feature.geometry.coordinates;
    if (feature.geometry.type === 'polygon') {
      coordinates.foreach(function (coordinate, idx){
        coordinates[idx] = encodepolygon(
          coordinate, encodeoffsets[idx] = []
        );
      });
    } else if(feature.geometry.type === 'multipolygon') {
      coordinates.foreach(function (polygon, idx1){
        encodeoffsets[idx1] = [];
        polygon.foreach(function (coordinate, idx2) {
          coordinates[idx1][idx2] = encodepolygon(
            coordinate, encodeoffsets[idx1][idx2] = []
          );
        });
      });
    }
  });
  if(type==='json'){
    results=json.stringify(json);
  }else{
    results=addechartsjswrapper(json.stringify(json), filename);
  }
  return results;
};
function encodepolygon(coordinate, encodeoffsets) {
  var result = '';
  var prevx = quantize(coordinate[0][0]);
  var prevy = quantize(coordinate[0][1]);
  // store the origin offset
  encodeoffsets[0] = prevx;
  encodeoffsets[1] = prevy;
  for (var i = 0; i < coordinate.length; i++) {
    var point = coordinate[i];
    result+=encode(point[0], prevx);
    result+=encode(point[1], prevy);
    prevx = quantize(point[0]);
    prevy = quantize(point[1]);
  }
  return result;
}
function addamdwrapper(jsonstr) {
  return ['define(function() {',
    '  return ' + jsonstr + ';',
    '});'].join('\n');
}
function addechartsjswrapper(jsonstr,filename) {
  return ['(function (root, factory) {',
    "  if (typeof define === 'function' && define.amd) {",
    "    define(['exports', 'echarts'], factory);",
    "  } else if (typeof exports === 'object' && typeof exports.nodename !== 'string') {",
    "    factory(exports, require('echarts'));",
    "  } else {",
    "    factory({}, root.echarts);",
    "  }",
    " }(this, function (exports, echarts) {",
    "    var log = function (msg) {",
    "      if (typeof console !== 'undefined') {",
    "        console && console.error && console.error(msg);",
    "      }",
    "    }",
    " if (!echarts) {",
    "    log('echarts is not loaded');",
    "      return;",
    "    }",
    " if (!echarts.registermap) {",
    "    log('echarts map is not loaded')",
    "    return;",
    " }",
    " echarts.registermap('"+filename+"',"+ jsonstr,
    ' )}));'].join('\n');
}
function encode(val, prev){
  // quantization
  val = quantize(val);
  // var tmp = val;
  // delta
  val = val - prev;
  if (((val << 1) ^ (val >> 15)) + 64 === 8232) {
    //wtf, 8232 will get syntax error in js code
    val--;
  }
  // zigzag
  val = (val << 1) ^ (val >> 15);
  // add offset and get unicode
  return string.fromcharcode(val+64);
  // var tmp = {'tmp' : str};
  // try{
  //   eval("(" + json.stringify(tmp) + ")");
  // }catch(e) {
  //   console.log(val + 64);
  // }
}
function quantize(val) {
  return math.ceil(val * 1024);
}

一个河北省的 geojson 示例（文件大小为 55 kb）：

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{"type": "featurecollection",
"cp":[115.4004,39.4688],
"size":"1300",
"features":
[
{"type": "feature","properties":{"id":"1308","name":"承德市","cp":[117.5757,41.4075],"childnum":11},"geometry":{"type":"polygon","coordinates":[[[116.0815,41.781],[116.1035,41.7865],[116.1255,41.8085],[116.1035,41.8359],[116.1255,41.8689],[116.1584,41.8634],[116.1694,41.8744],[116.1914,41.8634],[116.2134,41.8799],[116.2134,41.8909],[116.2244,41.9183],[116.2354,41.9238],[116.2244,41.9293],[116.2244,41.9348],[116.3013,41.9733],[116.3123,41.9952],[116.3342,42.0062],[116.3672,42.0117],[116.4111,41.9952],[116.4111,41.9678],[116.3892,41.9458],[116.4331,41.9403],[116.4661,41.9568],[116.499,41.9843],[116.532,41.9568],[116.543,41.9348],[116.5869,41.9238],[116.5979,41.9348],[116.6418,41.9293],[116.6638,41.9458],[116.7188,41.9403],[116.7188,41.9623],[116.7297,41.9733],[116.7407,41.9897],[116.7737,41.9952],[116.7737,41.9843],[116.7957,41.9733],[116.8506,42.0062],[116.8726,42.0007],[116.8835,42.0227],[116.8726,42.0282],[116.8835,42.0557],[116.8835,42.0667],[116.8945,42.0831],[116.8945,42.1051],[116.8286,42.1655],[116.8066,42.1765],[116.7957,42.1875],[116.8176,42.204],[116.9055,42.1875],[116.9165,42.1985],[116.9165,42.2534],[116.9055,42.2699],[116.9055,42.2919],[116.8945,42.3083],[116.9055,42.3523],[116.9055,42.3688],[116.9055,42.3853],[116.9165,42.4017],[116.9714,42.4292],[117.0044,42.4292],[117.0154,42.4567],[117.0813,42.4622],[117.0923,42.4841],[117.1362,42.4677],[117.2021,42.4677],[117.2791,42.4841],[117.334,42.4622],[117.3889,42.4622],[117.4109,42.4731],[117.3999,42.5116],[117.3999,42.5226],[117.4219,42.5226],[117.4329,42.5116],[117.4658,42.5171],[117.4768,42.5336],[117.4768,42.583],[117.4878,42.594],[117.5317,42.5885],[117.5427,42.5995],[117.5537,42.605],[117.5757,42.583],[117.6306,42.5665],[117.8064,42.616],[117.8064,42.5995],[117.7954,42.594],[117.8064,42.5775],[117.8394,42.561],[117.8613,42.5391],[117.8723,42.4951],[117.9272,42.4731],[117.9602,42.4292],[117.9712,42.4292],[118.0042,42.4127],[118.0261,42.3853],[118.0151,42.3468],[118.0261,42.3193],[118.0591,42.3083],[118.0591,42.2864],[117.9712,42.2424],[118.0261,42.2095],[118.0481,42.193],[118.103,42.182],[118.114,42.171],[118.103,42.149],[118.092,42.1106],[118.158,42.0831],[118.158,42.0612],[118.136,42.0667],[118.147,42.0557],[118.114,42.0447],[118.125,42.0392],[118.158,42.0282],[118.2019,42.0337],[118.2239,42.0557],[118.2239,42.0831],[118.2458,42.0941],[118.2678,42.0886],[118.3008,42.0557],[118.2788,42.0282],[118.2678,42.0282],[118.2349,42.0172],[118.2898,42.0062],[118.3008,41.9897],[118.3118,41.9897],[118.3008,41.9403],[118.2678,41.9293],[118.2678,41.9183],[118.3337,41.8744],[118.3337,41.8579],[118.3447,41.8469],[118.3228,41.8359],[118.3118,41.781],[118.2788,41.7645],[118.2678,41.7645],[118.2568,41.77],[118.2458,41.781],[118.2458,41.7975],[118.2239,41.814],[118.2019,41.8085],[118.1909,41.814],[118.1689,41.8085],[118.147,41.7975],[118.158,41.7865],[118.136,41.7645],[118.147,41.759],[118.136,41.7316],[118.158,41.7206],[118.1689,41.6821],[118.2239,41.6382],[118.2129,41.6162],[118.2349,41.5833],[118.2898,41.5723],[118.2898,41.5613],[118.3228,41.5668],[118.3118,41.5393],[118.3228,41.5173],[118.3228,41.5063],[118.3118,41.5009],[118.3118,41.4844],[118.2788,41.4789],[118.2678,41.4679],[118.3447,41.4514],[118.3557,41.424],[118.3557,41.391],[118.3667,41.3855],[118.3557,41.3745],[118.3557,41.3525],[118.3667,41.347],[118.3557,41.3361],[118.3777,41.3141],[118.3997,41.3086],[118.4106,41.3196],[118.4216,41.3361],[118.4875,41.347],[118.5095,41.3416],[118.5315,41.358],[118.5425,41.3525],[118.5864,41.3525],[118.6084,41.347],[118.6523,41.347],[118.6743,41.358],[118.6963,41.3306],[118.7073,41.3361],[118.7183,41.3306],[118.7512,41.3251],[118.7842,41.358],[118.8281,41.369],[118.8501,41.3855],[118.8501,41.369],[118.8391,41.3635],[118.8501,41.3525],[118.8501,41.347],[118.8721,41.3031],[118.927,41.3031],[118.949,41.3141],[118.9709,41.3086],[119.0149,41.3086],[119.0369,41.2976],[119.1467,41.2976],[119.2017,41.2866],[119.2126,41.2921],[119.2126,41.3086],[119.2456,41.3086],[119.2566,41.2811],[119.2456,41.2701],[119.2126,41.2537],[119.2126,41.2262],[119.1797,41.2262],[119.1687,41.2152],[119.1907,41.2042],[119.1907,41.1932],[119.1248,41.1383],[119.0808,41.1328],[119.0808,41.0944],[119.0698,41.0724],[119.0479,41.0779],[119.0369,41.0614],[118.96,41.0779],[118.938,41.0559],[118.938,41.0339],[118.949,41.0175],[119.0259,41.0065],[119.0259,40.99],[119.0039,40.968],[118.9709,40.957],[118.938,40.957],[118.916,40.968],[118.905,40.9625],[118.8831,40.8691],[118.8501,40.8197],[118.8501,40.8032],[118.8831,40.7813],[118.905,40.7813],[118.894,40.7593],[118.949,40.7483],[118.96,40.7208],[118.9819,40.7043],[119.0149,40.6879],[119.0369,40.6879],[119.0588,40.6659],[119.0808,40.6769],[119.1028,40.6659],[119.1577,40.6934],[119.1797,40.6824],[119.1797,40.6659],[119.1467,40.6384],[119.1577,40.6055],[119.1138,40.6055],[119.0808,40.589],[119.0588,40.6055],[118.96,40.556],[118.9709,40.5341],[118.96,40.5341],[118.927,40.5286],[118.894,40.5396],[118.8611,40.5286],[118.8281,40.5341],[118.7952,40.5121],[118.7842,40.4901],[118.7732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]
}

下面使用 java 8 中的脚本引擎执行该代码。

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package tk.mybatis;
import javax.script.invocable;
import javax.script.scriptengine;
import javax.script.scriptenginemanager;
import javax.script.scriptexception;
import java.io.filenotfoundexception;
import java.io.filereader;
public class encoder {
  public static final scriptengine engine = new scriptenginemanager().getenginebyname("nashorn");
  static {
    try {
      //注意这里的 encode.js 路径，文件内容就是上面的 js 代码
      engine.eval(new filereader(encoder.class.getresource("/encode.js").getpath()));
    } catch (scriptexception e) {
      e.printstacktrace();
    } catch (filenotfoundexception e) {
      e.printstacktrace();
    }
  }
  public static final invocable invocable = (invocable) engine;
  /**
   * 压缩为 echarts 格式的地图
   * @param geojson
   * @param filename
   * @param type   json 或 其他（按js处理）
   * @return
   */
  public static string convert2echarts(string geojson, string filename, string type) {
    try {
      return (string) invocable.invokefunction("convert2echarts", geojson, filename, type);
    } catch (scriptexception e) {
      throw new runtimeexception(e);
    } catch (nosuchmethodexception e) {
      throw new runtimeexception(e);
    }
  }
}

用法：

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string json = encoder.convert2echarts(
  "上面提供的河北省的geojson内容", "河北省", "json");

压缩后的结果如下（文件大小为 9 kb）：

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{
  "type": "featurecollection",
  "cp": [115.4004,
  39.4688],
  "size": "1300",
  "features": [{
    "type": "feature",
    "properties": {
      "id": "1308",
      "name": "承德市",
      "cp": [117.5757,
      41.4075],
      "childnum": 11
    },
    "geometry": {
      "type": "polygon",
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