SHPReaderJS/index-prj-read.html at master · YanzheZhang/SHPReaderJS · GitHub

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<!DOCTYPE html>
<html>
<head lang="en">
    <meta charset="UTF-8">
    <title>js读取shp文件</title>
    <script src="shp.js"></script>
    <script src="./node_modules/proj4/dist/proj4-src.js"></script>
    <style type="text/css">
        #canvas{
            border: 1px solid #ADACB0;
            display: block;
            margin: 20px auto;
        }
    </style>
</head>
<body>
    <div onclick="draw()" style="background-color:#a5c161">直接绘制</div>
    <input type="file" multiple accept="*.shp,*.prj,*.dbf,*.shx" onchange="openfile(this)"/>
<canvas id="canvas" width="720" height="360">
    你的浏览器还不支持canvas
</canvas>
<script type="text/javascript">
    var alberProj = 'PROJCS["WGS_1984_Albers",GEOGCS["GCS_WGS_1984",DATUM["D_WGS_1984",SPHEROID["WGS_1984",6378137,298.257223563]],PRIMEM["Greenwich",0],UNIT["Degree",0.017453292519943295]],PROJECTION["Albers"],PARAMETER["standard_parallel_1",25],PARAMETER["standard_parallel_2",47],PARAMETER["latitude_of_origin",0],PARAMETER["central_meridian",105],PARAMETER["false_easting",0],PARAMETER["false_northing",0],UNIT["meters",1]]';
    var wgs84Proj = 'GEOGCS["GCS_WGS_1984",DATUM["D_WGS_1984",SPHEROID["WGS_1984",6378137.0,298.257223563]],PRIMEM["Greenwich",0.0],UNIT["Degree",0.0174532925199433]]';

    var canvas = document.getElementById("canvas");
    var context = canvas.getContext("2d");
    //设置样式
    context.lineWidth = 1;
    context.strokeStyle = "#F5270B";

    /*
    直接获取服务端shp文件绘制
    */
    function draw() {
        SHPParser.load('./data/china.shp',
            function(res) {
                console.log('ok', res);
                context.clearRect(0, 0, canvas.width, canvas.height);
                for(var i=0;i<res.records.length;i++){
                    var points=res.records[i].shape.content.points;
                    //绘制每一个折线
                    context.beginPath();
                    context.moveTo(4.0*points[0],2.0*(180.0-2.0*points[1]));
                    for(var j=1;j<points.length/2;j++){
                        context.lineTo(4.0*points[j*2],2.0*(180.0-2.0*points[j*2+1]));
                    }
                    //绘制
                    context.stroke();
                }
            },
            function(res){ console.log('error', res); }
        );
    }

    /*
    打开本地shp文件绘制
    */
    function openfile(obj) {
        if (obj.files) { } else {
            alert('未选中文件！');
            return;
        }
        if (obj.files.length != 4) {
            alert('请同时选择shp、prj、shx和dbf四个文件！');
            return;
        }
        var nameArr = [];
        var typeArr = [];
        var typeStr = '';
        for (var i = 0; i < obj.files.length; i++) {
            nameArr[i] = obj.files[i].name.slice(0, obj.files[i].name.length - 4);
            typeArr[i] = obj.files[i].name.slice(obj.files[i].name.length - 3, obj.files[i].name.length);
            typeStr += obj.files[i].name.slice(obj.files[i].name.length - 3, obj.files[i].name.length);
        }
        if (nameArr[0] != nameArr[1] || nameArr[0] != nameArr[2] || nameArr[0] != nameArr[3]) {
            alert('请选择同一矢量文件！');
            //$.messager.alert('提示', '请选择同一矢量文件!');
            return;
        }
        for (var i = 0; i < obj.files.length; i++) {
            if (obj.files[i].size > 5 * 1024 * 1024) {
                alert('矢量文件超过5M，请抽稀后上传！');
                //$.messager.alert('提示', '矢量文件超过5M，请抽稀后上传!');
                return;
            }
        }
        if (typeStr.indexOf("shp") < 0) {
            alert('缺少shp文件！');
            //$.messager.alert('提示', '缺少shp文件！');
            return;
        }
        if (typeStr.indexOf("dbf") < 0) {
            alert('缺少dbf文件！');
            //$.messager.alert('提示', '缺少dbf文件！');
            return;
        }
        if (typeStr.indexOf("prj") < 0) {
            alert('缺少prj文件！');
            //$.messager.alert('提示', '缺少prj文件！');
            return;
        }
        if (typeStr.indexOf("shx") < 0) {
            alert('缺少shx文件！');
            //$.messager.alert('提示', '缺少shx文件！');
            return;
        }

        var isshp = false,  isprj = false;
        var datashp, datadbf, dataprj, datashx;

        for (var i = 0; i < typeArr.length; i++) {
            switch (typeArr[i]) {
                case 'shp':
                    var fshp = obj.files[i];
                    var readershp = new FileReader();
                    readershp.onload = function (e) {
                        datashp = e.target.result;
                        isshp = true;
                        if (isshp && isprj) {
                            //UploadScopeShp(datashp, datadbf, dataprj, datashx);
                            processData(datashp, dataprj);
                            if (obj != null) {
                                obj.value = null;
                            }
                        }
                    };
                    readershp.readAsArrayBuffer(fshp);
                    break;
                case 'prj':
                    var fprj = obj.files[i];
                    var readerprj = new FileReader();
                    readerprj.onload = function (e) {
                        dataprj = e.target.result;
                        isprj = true;
                        if (isshp && isprj) {
                            //UploadScopeShp(datashp, datadbf, dataprj, datashx);
                            processData(datashp, dataprj);
                            if (obj != null) {
                                obj.value = null;
                            }
                        }
                    };
                    readerprj.readAsText(fprj);
                    break;
            }
        }
    }

    function processData(shpData, prjData) {
        if (prjData.indexOf('PROJCS') > -1 && prjData.indexOf('WGS_1984_Albers') > -1) {
            //需要转换
            SHPParser.loadArrayBuffer(shpData,
           function (res) {
               //console.log('ok', res);
               context.clearRect(0, 0, canvas.width, canvas.height);
               for (var i = 0; i < res.records.length; i++) {
                   var points = res.records[i].shape.content.points;
                   //绘制每一个折线
                   context.beginPath();
                   var pointProj0 = proj4(alberProj, wgs84Proj, [points[0], points[1]]);
                   context.moveTo(4.0 * pointProj0[0], 2.0 * (180.0 - 2.0 * pointProj0[1]));
                   for (var j = 1; j < points.length / 2; j++) {
                       var pointProj = proj4(alberProj, wgs84Proj, [points[j * 2], points[j * 2 + 1]]);
                       context.lineTo(4.0 * pointProj[0], 2.0 * (180.0 - 2.0 * pointProj[1]));
                   }
                   //绘制
                   context.stroke();
               }

           },
           function () { alert('读取错误！'); }
           );
        } else if (prjData.indexOf('GEOGCS') > -1 && prjData.indexOf('GCS_WGS_1984') > -1 && prjData.indexOf('PROJCS') < 0) {
            //不需要转换
            SHPParser.loadArrayBuffer(shpData,
           function (res) {
               context.clearRect(0, 0, canvas.width, canvas.height);
               for (var i = 0; i < res.records.length; i++) {
                   var points = res.records[i].shape.content.points;
                   //绘制每一个折线
                   context.beginPath();
                   context.moveTo(4.0 * points[0], 2.0 * (180.0 - 2.0 * points[1]));
                   for (var j = 1; j < points.length / 2; j++) {
                       context.lineTo(4.0 * points[j * 2], 2.0 * (180.0 - 2.0 * points[j * 2 + 1]));
                   }
                   //绘制
                   context.stroke();
               }

           },
           function () { alert('读取错误！'); }
           );
        } else {
            //其它
            alert('投影不正确！');
        }
    }
</script>
</body>
</html>