ArcGIS API for JavaScript实现地图常用工具条 距离测量，面积测量
距离测量，面积测量等工具条是常用的工具。也是GIS系统的基础功能
效果图
工具条样式：
距离测量：
面积测量：
代码：
require([
"esri/map",
"esri/layers/ArcGISDynamicMapServiceLayer",
"esri/toolbars/navigation",
"esri/toolbars/draw",
"esri/tasks/GeometryService",
"esri/symbols/Font",
"esri/symbols/SimpleMarkerSymbol",
"esri/symbols/SimpleLineSymbol",
"esri/symbols/TextSymbol",
"esri/Color",
"dojo/number",
"esri/graphic",
"esri/tasks/LengthsParameters",
"esri/geometry/Point",
"esri/geometry/Polyline",
"esri/tasks/AreasAndLengthsParameters",
"dojo/dom-attr",
"dojo/domReady!"
],function(Map,ArcGISDynamicMapServiceLayer,Navigation,Draw,GeometryService,Font,SimpleMarkerSymbol,SimpleLineSymbol,TextSymbol,Color,number,Graphic,LengthsParameters,
Point,Polyline,AreasAndLengthsParameters,domAttr){
var chinaCollagelayer = new ArcGISDynamicMapServiceLayer("http://localhost:6080/arcgis/rest/services/2017shixi/collegeMap/MapServer");
var map = new Map("map");
map.addLayer(chinaCollagelayer);
//创建地图操作对象
var navToolbar = new Navigation(map);
//toolbar工具条
var toolbar = new Draw(map);
//调用esri自带的服务（在arcgis server Manger中，记得开启服务）
var geometryService =new GeometryService("http://localhost:6080/arcgis/rest/services/Utilities/Geometry/GeometryServer");
var totleDistance = 0.0;//总距离
var totalGraphic = null;//存储点集合
var disFun =false;//距离测量
var areaFun = false;//面积测量
var inputPoints = [];//存储生成点的集合
var startFont = new Font('12px').setWeight(Font.WEIGHT_BOLD);//定义文字样式
var makerSymbol = new SimpleMarkerSymbol(SimpleMarkerSymbol.STYLE_CIRCLE,8,
new SimpleLineSymbol(SimpleLineSymbol.STYLE_SOLID,new Color([204,102,51]),1),
new Color([158.184,71,0.65]));//定义标记点样式
//给按钮添加绑定事件
query(".functionWrap").on("click",function(event){
//获得按钮的文本信息
var value=domAttr.get(this,"title");
switch(value){
case "平移":
navToolbar.activate(Navigation.PAN);
break;
case "拉框缩小":
navToolbar.activate(Navigation.ZOOM_OUT);
break;
case "拉框放大":
navToolbar.activate(Navigation.ZOOM_IN);
break;
case "全图":
map.centerAndZoom(([110,38.5]),5);
break;
case "距离测量":
distanceMeasure();
break;
case "面积测量":
areaMeasure();
break;
case "清除标记":
clearAction();
break;
}
};
//长度量算
function distanceMeasure() {
map.enableScrollWheelZoom();
disFun=true;
areaFun=false;
toolbar.activate(Draw.POLYLINE);
}
//面积量算
function areaMeasure() {
map.enableScrollWheelZoom();
disFun=false;
areaFun=true;
toolbar.activate(Draw.POLYGON);
}
// 量算功能触发
map.on("click",function (evt) {
mapClick(evt);
});
//触发完成的事件
toolbar.on("draw-end",function (evt) {
addToMap(evt);
});
//生成两点之间的连线
toolbar.setLineSymbol(new SimpleLineSymbol(SimpleLineSymbol.STYLE_SOLID,new Color([255,0,0]),2));
//量算函数
function mapClick(evt) {
if(disFun){
inputPoints.push(evt.mapPoint);
var textSymbol;
if(inputPoints.length ===1){
textSymbol = new TextSymbol("起点",startFont,new Color([204,102,51]));
textSymbol.setOffset(0,-20);
map.graphics.add(new Graphic(evt.mapPoint,textSymbol));
}
map.graphics.add(new Graphic(evt.mapPoint,makerSymbol));
if(inputPoints.length >=2){
// 设置距离测量的参数
var lengthParams = new LengthsParameters();
lengthParams.distanceUnit = GeometryService.UNIT_METER;
lengthParams.calculationType = "preserveShape";
var p1 = inputPoints[inputPoints.length-2];
var p2 = inputPoints[inputPoints.length-1];
if(p1.x ===p2.x &&p1.y===p2.y){
return;
}
// z在两点之间划线将两点链接起来
var polyline = new Polyline(map.spatialReference);
polyline.addPath([p1,p2]);
lengthParams.polylines=[polyline];
// 根据参数，动态的计算长度
geometryService.lengths(lengthParams,function(distance){
var _distance = number.format(distance.lengths[0]/1000);
totleDistance+=parseFloat(_distance);//计算总长度
var beetwentDistances = _distance+"千米";
var tdistance = new TextSymbol(beetwentDistances,startFont,new Color([204,102,51]));
tdistance.setOffset(40,-3);
map.graphics.add(new Graphic(p2,tdistance));
if(totalGraphic){
map.graphics.remove(totalGraphic);
}
var total=number.format(totleDistance,{
pattern:"#.000"
});
// 设置总长度的显示样式，并添加到地图上
var totalSymbol=new TextSymbol("总长度："+total+"千米",startFont,new Color([204,102,51]));
totalSymbol.setOffset(40,-15);
totalGraphic= map.graphics.add(new Graphic(p2,totalSymbol));
});
}
}
}
// 添加图形函数
function addToMap(evt) {
if(disFun||areaFun){
var geometry = evt.geometry;//绘制图形的geometry
//将绘制的图形添加到地图上去
var symbol = null;
switch (geometry.type){
case "point":
symbol = new SimpleMarkerSymbol(SimpleMarkerSymbol.STYLE_CIRCLE,10,
new SimpleLineSymbol(SimpleLineSymbol.STYLE_SOLID,new Color([255,0,0]),1),
new Color([0,255,0,0.25]));
break;
case "polyline":
symbol = new SimpleLineSymbol(SimpleLineSymbol.STYLE_SOLID,
new Color([255,0,0,0.8]),2);
break;
case "polygon":
symbol = new SimpleFillSymbol(SimpleFillSymbol.STYLE_SOLID,
new SimpleLineSymbol(SimpleLineSymbol.STYLE_SOLID,new Color([255,0,0]),2),
new Color([255,255,0,0.25]));
break;
case "extent":
symbol = new SimpleFillSymbol(SimpleFillSymbol.STYLE_SOLID,
new SimpleLineSymbol(SimpleLineSymbol.STYLE_SOLID,new Color([255,0,0]),2),
new Color([255,255,0,0.25]));
break;
}
map.graphics.add(new Graphic(geometry,symbol));
if(disFun){
inputPoints.splice(0,inputPoints.length);//删除数组中的所有元素
totleDistance =0.0;
totalGraphic = null;
}
else if(areaFun){
//设置面积和长度的参数
var areasAndLengthsParameters =new AreasAndLengthsParameters();
areasAndLengthsParameters.lengthUnit = GeometryService.UNIT_METER;//设置距离单位
areasAndLengthsParameters.areaUnit = GeometryService.UNIT_SQUARE_KILOMETERS;//设置面积单位
geometryService.simplify([geometry],function (simplifiedGeometries) {
areasAndLengthsParameters.polygons = simplifiedGeometries;
geometryService.areasAndLengths(areasAndLengthsParameters,function (result) {
var font =new Font("16px",Font.STYLE_NORMAL,Font.VARIANT_NORMAL,Font.WEIGHT_BOLDER);
var areaResult = new TextSymbol(number.format(result.areas[0],{
pattern:'#.000'
})+"平方公里",font,new Color([204,102,51]));
var spoint = new Point(geometry.getExtent().getCenter().x,geometry.getExtent().getCenter().y,map.spatialReference);
map.graphics.add(new Graphic(spoint,areaResult));//在地图上显示测量的面积
});
});
}
}
}
//清空函数
function clearAction() {
toolbar.deactivate();//撤销地图绘制功能
disFun = false;
areaFun = false;
map.enableScrollWheelZoom();
map.graphics.clear();
var graphicLayerIds = map.graphicsLayerIds;
var len = graphicLayerIds.length;
for(var i=0; ivar gLayer = map.getLayer(graphicLayerIds[i]);
gLayer.clear();
}
}
});