Ceisum实时获取后台数据 实时更新实体位置信息

_.prototype._init = function(){

    var _self = this;

    var _update = function(){

        return _self.positions;

    };

    //实时更新polyline.positions

    this.options.polyline.positions = new Cesium.CallbackProperty(_update,false);

    viewer.entities.add(this.options);

    entityArr.push(this.options)

};

return _;

})();

var czml2 = [{

"id": "document",

"name":"CZML Path",

"version": "1.0",

}, {

"id": "path1",

"name": "path with GPS flight data",

"description": "<p>Hang gliding flight log data from Daniel H. Friedman.<br>Icon created by Larisa Skosyrska from the Noun Project</p>",

"availability": "2012-08-04T10:00:00Z/2012-08-04T15:00:00Z",

    "billboard":{

    "image":"data:image/svg+xml;base64,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",

    "scale":0.2

},

"position": {

    "cartographicDegrees": [ 118.87826541800007, 30.956799, 0.0,]

}

}];

var c2 = new Cesium.CzmlDataSource();

viewer.dataSources.add(c2.load(czml2));

// 动态赋值

var i = 30.956799;

var a = 20;

var b=118.87826541800007;

var realTimeClData=setInterval(function() {

i+= 10.001*Math.random();

b+=10.001*Math.random();

a+= 10;

//图标：更新czml坐标

czml2[1].position.cartographicDegrees = [b,i,0];

c2.process(czml2);

//线：更新entities坐标

var cartesian =Cesium.Cartesian3.fromDegrees( b, i, 0);

if(positions.length == 0) {

    positions.push(cartesian.clone());

    positions.push(cartesian);

}

if(positions.length >= 2){

    if (!Cesium.defined(poly)) {

        poly = new PolyLinePrimitive(positions);

    }else{

        //positions.pop();

        //cartesian.y += (1 + Math.random());

        positions.push(cartesian);

        //只展示5条坐标数据

        //if(positions.length>5){

        //    positions.shift();

        //}

        console.log(positions.length,"positions");

    }

}

}, 1000);

Sandcastle.addToolbarButton(‘清除计时器’, function() {

clearInterval(realTimeClData);

});

二维展示



![](https://img-blog.csdnimg.cn/20200527191030530.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3lhbmd3cWk=,size_16,color_FFFFFF,t_70)



三维展示



![](https://img-blog.csdnimg.cn/20200527191121961.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3lhbmd3cWk=,size_16,color_FFFFFF,t_70)



 多个实体运动：实时加载数据 更新位置信息

var viewer = new Cesium.Viewer(‘cesiumContainer’, {

infoBox : false,

selectionIndicator : false,

shadows : true,

shouldAnimate : true

});

var PolyLinePrimitive = (function(){

function _(positions){

    this.options = {

        polyline : {

            show : true,

            positions : [],

            material : Cesium.Color.CORNFLOWERBLUE,

            width : 1,

            arcType : Cesium.ArcType.RHUMB,

        }

    };

    this.positions = positions;

    this._init();

} 

_.prototype._init = function(){

    var _self = this;

    var _update = function(){

		// 1秒将近100次的调用定义的positions数组，实时加载更新线的坐标位置!!!

        return _self.positions;

    };

    //实时更新polyline.positions

    this.options.polyline.positions = new Cesium.CallbackProperty(_update,false);

    viewer.entities.add(this.options);

};

return _;

})();

// 记录线的坐标，PolyLinePrimitive实体类监听的坐标

var positions = [];

// 记录线的所有实体对象

var poly = [];//undefined

// 测试实体条数

var ec =5;

// 添加初始化数据（positions、poly）

for (var i = 0; i < ec; i++){

positions.push([]);

poly.push(undefined);

}

var czml2 = [{

"id": "document",

"name":"CZML Path",

"version": "1.0",

}, {

"id": "path1",

"name": "path with GPS flight data",

"availability": "2012-08-04T10:00:00Z/2012-08-04T15:00:00Z",

    "billboard":{

    "image":"data:image/svg+xml;base64,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",

    "scale":0.2

},

"position": {

    "cartographicDegrees": [ 118.87826541800007, 30.956799, 0.0,]

}

}];

// 动态赋值

var i = 30.956800;

var a = 20;

var b=118.8774481050001;

var czmlBox=[];

var dataSourceBox=[];

var ii = [];

var bb = [];

for (var i = 0 ; i < ec; i++){

ii.push(i);

bb.push(b);

czmlBox.push(czml2);

var DataSource = new Cesium.CzmlDataSource();

viewer.dataSources.add(DataSource.load(czml2));

dataSourceBox.push(DataSource);

}

var realTimeClData=setInterval(function() {

for (var i = 0 ; i < ec; i++){

    ii[i] += 10.001*Math.random();

    bb[i] += 10.001*Math.random();

	//图标

	czmlBox[i][1].position.cartographicDegrees = [bb[i],ii[i],0];

	dataSourceBox[i].process(czmlBox[i]);

	//线

	var cartesian =Cesium.Cartesian3.fromDegrees( bb[i], ii[i], 0);

	if(positions[i].length == 0){

		positions[i].push(cartesian.clone());

		positions[i].push(cartesian);

	}

	if(positions[i].length >= 2){

		if (!Cesium.defined(poly[i])) {

			poly[i] = new PolyLinePrimitive(positions[i]);

		}else{

            if(positions[i].length>5){

                positions[i].shift();

            }

			positions[i].push(cartesian);

		}

	}

}

},2000);

Sandcastle.addToolbarButton(‘清除计时器’, function() {

clearInterval(realTimeClData);

});

二维展示