坐标转换
将原始坐标转换成wkid:32652坐标，并且使用回调将数据返回
back.coordinateConvert = function(geometry,callback){
var geometryService = new GeometryService(baseURL+"/Utilities/Geometry/GeometryServer");
var params = new ProjectParameters();
params.geometries = [geometry];
params.outSR = new SpatialReference(32652);
geometryService.project(params).then(function(resGeometry){
callback(resGeometry);
})
}
数据查询
区域图层数据查询，并且使用回调将数据返回
back.getReginData = function(callback){
var query = new Query();
query.where = "1=1";
query.returnGeometry = true;
query.outFields = ["*"];
var queryTask = new QueryTask("http://localhost:6080/arcgis/rest/services/dt1124/MapServer/18");
queryTask.execute(query,function(response){
callback(response);
})
}
relation
用于判断geometry之间的关系，如相交，包含，相切等
back.relation = function(geometries1,geometries2){
var geometryService = new GeometryService(baseURL+"Utilities/Geometry/GeometryServer");
var relationParams = new RelationParameters();
relationParams.geometries1 = geometries1;
relationParams.geometries2 = geometries2;
relationParams.relation = RelationParameters.SPATIAL_REL_INTERSECTION;
var result = geometryService.relation(relationParams);
return result;
}
SPATIAL_REL_INTERSECTION:相交。可选择不同的关系
返回值result是个Deferred对象，调用时：
var relation = back.relation(resGeometry,geometryArray);
relation.then(function(data){
console.dir(data);
})
结果如下图所示：
image.png
表示存在两个相交关系：geometries1[0]与geometries2[3]相交，geometries1[1]与geometries2[0]相交
