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": 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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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原文链接：https://blog.csdn.net/isea533/article/details/79194819
