var map, toolbar, geometryService ;

      function init() {

       map=new esri.Map("map",{

	          extent:new esri.geometry.Extent({xmin:110,ymin:31 ,xmax:117 ,ymax :37,spatialReference:{wkid:4326} })

	    });//选取的空间坐标系范围 

        dojo.connect(map, "onLoad", initToolbar);

        map.addLayer(new esri.layers.ArcGISTiledMapServiceLayer("url");

      }

 function initToolbar(map) {

        toolbar = new esri.toolbars.Draw(map); 

        //添加toolbar画图完成后事件监听调用    doMeasure

        dojo.connect(toolbar, "onDrawEnd", doMeasure);

        //实例化GeometryService，地址为ags发布的GeometryServer

         var geomrtryserver ="url2";

        geometryService = new esri.tasks.GeometryService(geomrtryserver);

      }

//量测

	function measutreLength() {

   		 toolbar.activate(esri.toolbars.Draw.POLYLINE);

    }  

	function measutreArea() {

		toolbar.activate(esri.toolbars.Draw.POLYGON);

	}

	//量算

function doMeasure(geometry) {

    //更加类型设置显示样式

    measuregeometry = geometry;

    toolbar.deactivate();

    switch (geometry.type) {

        case "polyline":

            var symbol = new esri.symbol.SimpleLineSymbol(esri.symbol.SimpleLineSymbol.STYLE_SOLID, new dojo.Color([0, 0, 0]), 2);

            break;

        case "polygon":

            var symbol = new esri.symbol.SimpleFillSymbol(esri.symbol.SimpleFillSymbol.STYLE_NONE, new esri.symbol.SimpleLineSymbol(esri.symbol.SimpleLineSymbol.STYLE_DASHDOT, new dojo.Color([255, 0, 0]), 2), new dojo.Color([255, 255, 0, 0.25]));

            break;

    }

    //设置样式

    var graphic = new esri.Graphic(geometry,symbol);

    //清除上一次的画图内容

    map.graphics.clear();

    map.graphics.add(graphic);

    //进行投影转换，完成后调用projectComplete

    MeasureGeometry(geometry);

}  

//投影转换完成后调用方法

function MeasureGeometry(geometry) {

    //如果为线类型就进行lengths距离测算

    if (geometry.type == "polyline") {

        var lengthParams = new esri.tasks.LengthsParameters();

        lengthParams.polylines = [geometry];

        lengthParams.lengthUnit = esri.tasks.GeometryService.UNIT_METER;

        lengthParams.geodesic = true;

        lengthParams.polylines[0].spatialReference = new esri.SpatialReference(4326);

        geometryService.lengths(lengthParams);

        dojo.connect(geometryService, "onLengthsComplete", outputDistance);

    }

    //如果为面类型需要先进行simplify操作在进行面积测算

    else if (geometry.type == "polygon") {

        var areasAndLengthParams = new esri.tasks.AreasAndLengthsParameters();

        areasAndLengthParams.lengthUnit = esri.tasks.GeometryService.UNIT_METER;

        areasAndLengthParams.areaUnit = esri.tasks.GeometryService.UNIT_SQUARE_METERS;

        this.outSR = new esri.SpatialReference({ wkid: 102113 });

        geometryService.project([geometry], this.outSR, function (geometry) {

            geometryService.simplify(geometry, function (simplifiedGeometries) {

                areasAndLengthParams.polygons = simplifiedGeometries;

                areasAndLengthParams.polygons[0].spatialReference = new esri.SpatialReference(102113);

                geometryService.areasAndLengths(areasAndLengthParams);

            });

        });

        dojo.connect(geometryService, "onAreasAndLengthsComplete", outputAreaAndLength);

    }

}  

//显示测量距离

function outputDistance(result) {

    var CurX = measuregeometry.paths[0][measuregeometry.paths[0].length - 1][0];

    var CurY = measuregeometry.paths[0][measuregeometry.paths[0].length - 1][1];

    var  CurPos  =  new  esri.geometry.Point(CurX,  CurY, map.spatialReference);

    map.infoWindow.setTitle("距离测量");

    map.infoWindow.setContent(" 测 量 长 度 ： <strong>" + parseInt(String(result.lengths[0])) + "米</strong>");

    map.infoWindow.show(CurPos);

}  

//显示测量面积

function outputAreaAndLength(result) {

    var CurX = (measuregeometry._extent.xmax + measuregeometry._extent.xmin) / 2;

    var CurY = (measuregeometry._extent.ymax + measuregeometry._extent.ymin) / 2

    var CurPos = new esri.geometry.Point(CurX, CurY, map.spatialReference);

    map.infoWindow.setTitle("面积测量");

    map.infoWindow.setContent(" 面积 ： <strong>" + parseInt(String(result.areas[0])) + "平方米</strong> 周长：" + parseInt(String(result.lengths[0])) + "米");

    map.infoWindow.show(CurPos);

    //alert("面积：" + dojo.number.format(result.areas[0]) + "平方米" + " 长度：" + dojo.number.format(result.lengths[0]) + "米");

}