define(['dojo/_base/lang',
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'dojo/_base/array',
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"dojo/_base/declare"
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],
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function (lang,
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array,
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declare
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){
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return declare("FlightTool",[], { // 飞行工具类
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_map: null,
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_route:null,
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ispause:false,
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startTime:null,
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frame_handler:null,
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constructor: function (options) {
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var self = this;
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self._map = options.map;
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/**
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* 帧处理者
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**/
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self.frame_handler = function () {
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self._route.thistime = new Date().getTime();
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self._route.timespan = 0;
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self._route.nexttime = 0.001;
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self._route.timespan = (self._route.thistime - self.startTime) / 1000;
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self._route.lasttime = self._route.lasttime + self._route.timespan;
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if (self._route.lasttime > self._route.timesum) {
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self._route.lasttime = 0;
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}
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self._route.nexttime = self._route.lasttime + self._route.timespan * 2;
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if (self._route.nexttime > self._route.timesum) {
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self._route.nexttime = self._route.timesum;
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}
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self._route.point = self._route.spline.evaluate(self._route.lasttime);
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self._route.point2 = self._route.spline.evaluate(self._route.nexttime);
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self._route.heading = self.getHeadingRadian(self.ctsn3ToDegree(self._route.point), self.ctsn3ToDegree(self._route.point2));
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self._route.pitch = Cesium.Cartesian3.angleBetween(self._route.point, self._route.point2)-Math.PI/12;
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self._map.camera.lookAt(self._route.point, new Cesium.HeadingPitchRange(self._route.heading, self._route.pitch, 100.0));
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self.startTime = self._route.thistime;
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}
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},
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startFly:function () {
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this.stopFly();
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this.ispause = false;
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var points = [];
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for(var i=0;i<this._route.timesum;i+=0.1){//航线线条的平滑度(与飞行无关)
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points.push(this._route.spline.evaluate(i));//根据时间获取三次曲线坐标
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}
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this._route.flyline = this._map.entities.add({
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name : '路线',
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polyline : {
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positions : points,
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width : 1,
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material : Cesium.Color.YELLOW,
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//clampToGround : true
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}
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});
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this._route.lasttime = this._route.timesum;
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this.startTime = new Date().getTime();
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this._map.clock.onTick.addEventListener(this.frame_handler);
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},
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pasueFly:function () {
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if(this.ispause){
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this.ispause = false;
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this._map.clock.onTick.addEventListener(this.frame_handler);
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}else{
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this.ispause = true;
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this._map.clock.onTick.removeEventListener(this.frame_handler);
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}
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},
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stopFly:function () {
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if(this._route!=undefined&&this._route.flyline!=undefined){
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this._map.entities.remove(this._route.flyline);
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this._route.flyline = undefined;
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}
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this._map.clock.onTick.removeEventListener(this.frame_handler);
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this._map.camera.lookAtTransform(Cesium.Matrix4.IDENTITY);
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},
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/**
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* 创建路线
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**/
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createFlyRoute:function (option) {
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option.timeline = [];
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option.timeline.push(0);
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option.pointline = [];
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option.timesum = 0;
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option.pointline.push(Cesium.Cartesian3.fromDegrees(option.points[0].lgtd, option.points[0].lttd, option.points[0].height));
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for (var index = 0; index < option.points.length-1; index ++) {
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let length = this.getSpaceDistance([{
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longitude: option.points[index].lgtd,
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latitude: option.points[index].lttd,
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height: option.points[index].height
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},
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{
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longitude: option.points[index + 1].lgtd,
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latitude: option.points[index + 1].lttd,
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height: option.points[index + 1].height
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}]);
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let t = length / option.speed;//计算时间
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option.timesum += t;
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option.timeline.push(option.timesum);
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option.pointline.push(Cesium.Cartesian3.fromDegrees(option.points[index + 1].lgtd, option.points[index + 1].lttd, option.points[index + 1].height));
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}
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option.lasttime = option.timesum;
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option.spline = new Cesium.CatmullRomSpline({
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times: option.timeline,
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points: option.pointline
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});
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//航向
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option.hpRange = new Cesium.HeadingPitchRange();
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option.fixedFrameTransforms = Cesium.Transforms.localFrameToFixedFrameGenerator('north', 'west');
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if(this._route!=null&&this._route.flyline!=undefined){
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this._map.entities.remove(this._route.flyline);
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this._route.flyline = undefined;
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}
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this._route = option;
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},
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ctsn3ToDegree:function (cartesian3) {
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var cartographic = this._map.scene.globe.ellipsoid.cartesianToCartographic(cartesian3);
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return {
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lng: Cesium.Math.toDegrees(cartographic.longitude),
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lat: Cesium.Math.toDegrees(cartographic.latitude),
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alt: cartographic.height
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};
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},
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getHeadingRadian:function (point1, point2) {
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return Math.atan2(point2.lng - point1.lng, point2.lat - point1.lat);
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},
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/**
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* 空间两点距离计算函数 单位 米
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**/
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getSpaceDistance:function (positions) {
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var distance = 0;
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var deg;
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for (var i = 0; i < positions.length - 1; i++) {
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deg = positions[i];
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var point1cartographic = Cesium.Cartographic.fromDegrees(deg.longitude, deg.latitude, deg.height);
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deg = positions[i + 1];
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var point2cartographic = Cesium.Cartographic.fromDegrees(deg.longitude, deg.latitude, deg.height);
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//根据经纬度计算出距离
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var geodesic = new Cesium.EllipsoidGeodesic();
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geodesic.setEndPoints(point1cartographic, point2cartographic);
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var s = geodesic.surfaceDistance;
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//console.log(Math.sqrt(Math.pow(distance, 2) + Math.pow(endheight, 2)));
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//返回两点之间的距离
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s = Math.sqrt(Math.pow(s, 2) + Math.pow(point2cartographic.height - point1cartographic.height, 2));
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distance = distance + s;
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}
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return distance;
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}
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});
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});
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