SuperMap.Web.Realspace.ViewShed3D = function() {};

var instanceVar = new SuperMap.Web.Realspace.ViewShed3D();

function drawpoint(){


     sceneControl.set_sceneAction(null);
     var newAction = new SuperMap.Web.UI.Action3Ds.ViewShed3DAction(sceneControl,viewShed3d);

     设置用户当前操作类型
     sceneControl.set_sceneAction(newAction);
}
 
继承自SuperMap.Web.UI.Action3Ds.SceneAction类扩展一个SuperMap.Web.UI.Action3Ds.DrawPoint

可视域分析操作

SuperMap.Web.UI.Action3Ds.ViewShed3DAction = function (sceneControl,viewShed3d) {


     SuperMap.Web.UI.Action3Ds.ViewShed3DAction.initializeBase(this);
     this._name = "ViewShed3DAction";
     this._sceneControl = sceneControl;
     this._viewShed3d = viewShed3d;
     this._point;
     this._type = SuperMap.Web.UI.Action3Ds.SceneActionType.POINTSELECT;
};
     SuperMap.Web.UI.Action3Ds.ViewShed3DAction.prototype = {
            dispose: function () {


            this._sceneControl = null;
            },
     onMouseDown: function (e) {


             if (e.get_flagType() % 2 == 1 ) {
                var pt = new SuperMap.Pixel(e.get_clientX(), e.get_clientY());

                将二维屏幕点转换为三维点
                var tmpPoint = this._sceneControl.pixelToGlobe(pt, SuperMap.Web.Realspace.PixelToGlobeMode.TerrainAndModel);


                    if(this._point == null){
                        this._point = tmpPoint;
                        this._viewShed3d.set_viewerPosition(tmpPoint);
                        this._viewShed3d.set_distance(0);
                        this._viewShed3d.build();
                    }else {
                        this._point = null;
                        var panAction = new SuperMap.Web.UI.Action3Ds.Pan(sceneControl);

                        设置用户当前操作类型为漫游操作 
                        sceneControl.set_sceneAction(panAction);
 
                        document.getElementById("viewpoint").disabled = true;
                        document.getElementById("clear").disabled = 0;
                    }
                }
            },
       onMouseMove: function (e) {


             if(this._point != null){
                  var pt = new SuperMap.Pixel(e.get_clientX(), e.get_clientY());


                  this._point = this._sceneControl.pixelToGlobe(pt, SuperMap.Web.Realspace.PixelToGlobeMode.TerrainAndModel);
                  根据目标点位置，计算观察者位置与目标点的距离和方向

                  this._viewShed3d.setDistDirByPoint(this._point);
              }
        }
};
 SuperMap.Web.UI.Action3Ds.ViewShed3DAction.registerClass('SuperMap.Web.UI.Action3Ds.ViewShed3DAction', SuperMap.Web.UI.Action3Ds.SceneAction, Sys.IDisposable);
       
执行可视域分析

function  doAnalysis(nodeAnmination){


            if(viewShed3d){
            viewShed3d.clear();
}
      var point3D = nodeAnmination.get_position();

      point3D = new SuperMap.Web.Core.Point3D(point3D.x, point3D.y, (point3D.z + 2));


      var direction = nodeAnmination.get_direction();
      设置观察点位置

      viewShed3d.set_viewerPosition(point3D);
      设置相机与正北方向的夹角

      viewShed3d.set_direction(direction);
      设置可视距离

      viewShed3d.set_distance(100);
      设置水平视角范围

      viewShed3d.set_horizontalFov(90);
      设置垂直视角范围

      viewShed3d.set_verticalFov(60);
      执行分析

      viewShed3d.build();
        }
清除分析结果

function clearAll(){


      viewShed3d.clear();
      document.getElementById("viewpoint").disabled = 0;
      document.getElementById("clear").disabled = true;
      删除跟踪图层所有要素对象

      scene.get_trackingLayer3D().removeAll();
}