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  • ArcGIS api for javascript—测量,测距问题

    首先量测

      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");  
    }  
    	
    

      

     

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  • 原文地址:https://www.cnblogs.com/xiaotian-222/p/6651517.html
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