cesium飞行漫游
var flyRouter = function(viewer){
this._viewer = viewer;
};
flyRouter.prototype = {
get flyManager(){
return this._flyManager;
},
set flyManager(value){
this._flyManager = value;
},
get flyEntity(){
return this._flyEntity;
},
set flyEntity(value){
this._flyEntity = value;
},
get viewer(){
return this._viewer;
}
};
/** 通过传入坐标点数组方式飞行
* 参数 Array positions点数组，Object Model 模型对象,Number time飞行时间 以毫秒为单位
* 执行飞行函数
**/
flyRouter.prototype.flyRouterByPositions = function(positions=[], model, time){
if(positions.length == 0){
return;
}
/*var positionA = az.geometry.coordinates;
for (i = 0; i < positionA.length; i++) {
var x = positionA[i][0];
var y = positionA[i][1];
positions.push({ x: x, y: y });
}*/
//positions = [{ x: 113.106100, y: 33.498900 }, { x: 111.100000, y: 34.320000 }, { x: 109.050000, y: 35.150000 }, { x: 107.010000, y: 35.9140000 }, { x: 104.900000, y: 36.7140000 }, { x: 102.800000, y: 37.600000 }, { x: 100.690800, y: 38.422000 }, { x: 98.570700, y: 39.241700 }, { x: 96.396500, y: 40.066100 }];
var start = Cesium.JulianDate.fromDate(new Date());
var stop = Cesium.JulianDate.addSeconds(start, time, new Cesium.JulianDate());
//Make sure viewer is at the desired time.
this.viewer.clock.startTime = start.clone();
this.viewer.clock.stopTime = stop.clone();
this.viewer.clock.currentTime = start.clone();
this.viewer.clock.clockRange = Cesium.ClockRange.CLAMPED; //Loop at the end
this.viewer.clock.multiplier = 10;
this.viewer.clock.canAnimate = false;
var _position = this.computeCirclularFlight(positions,start,stop);
this.flyEntity = this.viewer.entities.add({
//Set the entity availability to the same interval as the simulation time.
availability: new Cesium.TimeIntervalCollection([new Cesium.TimeInterval({
start: start,
stop: stop
})]),
position: _position,
orientation: new Cesium.VelocityOrientationProperty(_position),
model: model,
//Show the path as a pink line sampled in 1 second increments.
path: {
resolution: 1,
material: new Cesium.PolylineGlowMaterialProperty({
glowPower: 0.1,
color: Cesium.Color.YELLOW
}),
width: 30
}
});
this.viewer.trackedEntity = this.flyEntity;
};
/**
*计算运动轨迹函数
*position 点数组[{x:"",y:"",z:""}]
*
**/
flyRouter.prototype.computeCirclularFlight = function(position=[], start, stop) {
var property = new Cesium.SampledPositionProperty();
for (var i = 0; i < position.length; i++) {
if (i == 0) {
var time = Cesium.JulianDate.addSeconds(start, i, new Cesium.JulianDate());
var _position = Cesium.Cartesian3.fromDegrees(position[i].x, position[i].y, position[i].z);
property.addSample(time, _position);
}
if (i > 0) {
var position_a = new Cesium.Cartesian3(property._property._values[i * 3 - 3], property._property._values[i * 3 - 2], property._property._values[i * 3 - 1]);
var _position = Cesium.Cartesian3.fromDegrees(position[i].x, position[i].y, position[i].z);
var positions = [Cesium.Ellipsoid.WGS84.cartesianToCartographic(position_a), Cesium.Ellipsoid.WGS84.cartesianToCartographic(_position)];
var a = new Cesium.EllipsoidGeodesic(positions[0], positions[1]);
var long = a.surfaceDistance;
var _time = long/50;
var time = Cesium.JulianDate.addSeconds(property._property._times[i - 1], _time, new Cesium.JulianDate());
property.addSample(time, _position);
}
}
return property;
};
//暂停飞行
flyRouter.prototype.pause = function(){
this.viewer.clock.multiplier = 0;
};
//向前飞行
flyRouter.prototype.forward = function(){
this.viewer.clock.multiplier = 10;
};
//向后飞行
flyRouter.prototype.backward = function(){
this.viewer.clock.multiplier = -10;
};
//退出飞行
flyRouter.prototype.stopFly = function(){
/* var start = Cesium.JulianDate.fromDate(new Date());
viewer.clock.startTime = start.clone();
var stop = Cesium.JulianDate.addSeconds(start, 300000000, new Cesium.JulianDate());
viewer.clock.stopTime = stop.clone();*/
this.viewer.clock.multiplier = 0;
if(this.flyEntity){
this.viewer.entities.remove(this.flyEntity);
}
};
