arcgis api for javascript 距离与面积量算

在之前的实验中，距离量算跟面积量算一直出问题，费了非常长的时间，各种调式找不到原因。

如今成功完毕。与君共勉

1、距离量算中        lengthParams.polylines = [geometry];

2、面积量算中        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);
            });
        });

还有面积量算中跟距离量算有所不同，须要进行投影变换！由于一般咱们的底图坐标系为4326

//量測 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);//清除上一次的绘图内容myMap.graphics.clear();myMap.graphics.add(graphic);//进行投影转换，完毕后调用projectCompleteMeasureGeometry(geometry); }//投影转换完毕后调用方法 function MeasureGeometry(geometry) {//假设为线类型就进行lengths距离測算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);}//假设为面类型须要先进行simplify操作在进行面积測算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);} }//显示測量距离 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, myMap.spatialReference);myMap.infoWindow.setTitle("距离測量");myMap.infoWindow.setContent(" 測 量 长 度 ： <strong>" + parseInt(String(result.lengths[0])) + "米</strong>");myMap.infoWindow.show(CurPos); }//显示測量面积 function outputAreaAndLength(result) {var CurX = (measuregeometry._extent.xmax + measuregeometry._extent.xmin) / 2;var CurY = (measuregeometry._extent.ymax + measuregeometry._extent.ymin) / 2var CurPos = new esri.geometry.Point(CurX, CurY, myMap.spatialReference);myMap.infoWindow.setTitle("面积測量");myMap.infoWindow.setContent(" 面积 ： <strong>" + parseInt(String(result.areas[0])) + "平方米</strong> 周长：" + parseInt(String(result.lengths[0])) + "米");myMap.infoWindow.show(CurPos);//alert("面积：" + dojo.number.format(result.areas[0]) + "平方米" + " 长度：" + dojo.number.format(result.lengths[0]) + "米"); }

转载于:https://www.cnblogs.com/ldxsuanfa/p/10775947.html

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