【Cesium开发实战】飞行漫游功能的实现，可设置漫游路径，漫游高度，暂停，继续，删除路径

Cesium有很多很强大的功能，可以在地球上实现很多炫酷的3D效果。今天给大家分享一个可自定义的漫游飞行功能。

1.话不多说，先展示

漫游

2.设计思路

项目需求，可自定义漫游路径，并且设置高度，暂停，继续，删除等功能。点击绘制开始在地图上绘制漫游的路径点位，双击结束后可编辑漫游路径名和漫游的高度设置。点击飞行，创建模型，使模型按照设定的点位和高度进行漫游。

3.具体代码

	
		绘制
		
			
			
				
					飞行
					暂停
					继续
					 
				
			
		
	
	
		
			
				
			
			
				
			
		
		
			
				 确定 
			
		
	


import { onMounted, onUnmounted, reactive, ref } from 'vue';
import { Cesium } from '/@/utils/cesium';
const props = defineProps(['viewer']);
const dialogFormVisible = ref(false);
var handler: any = null;
const formRef = ref();
const rules = {
	title: { required: true, message: '请输入漫游路径名称', trigger: 'blur' },
};
//漫游名称
const form = reactive({
	title: '',
	height: 300,
});
//是否开始绘制
const drawing = ref(false);
//列表数据
const dataList: any = reactive([]);
//绘制的所有地面的点线实体集合
var entities: any = [];
//临时一条数据的point实体列表
var pointEntities: any = [];
//临时一条数据的线实体列表
var linesEntities: any = [];
var activeShapePoints: any = [];
//构建列表一条数据的数据，经纬度高度。
var customMarks: any = [];
var floatingPoint: any = undefined;
var activeShape: any = undefined;
//绘制线路
const drawLineRoad = () => {
	drawing.value = true;
	handler = new Cesium.ScreenSpaceEventHandler(props.viewer.scene.canvas);
	//鼠标左键
	handler.setInputAction(function (event: any) {
		if (drawing.value) {
			var earthPosition = props.viewer.scene.pickPosition(event.position);
			if (Cesium.defined(earthPosition)) {
				if (activeShapePoints.length === 0) {
					floatingPoint = createPoint(earthPosition);
					activeShapePoints.push(earthPosition);
					var dynamicPositions = new Cesium.CallbackProperty(function () {
						return activeShapePoints;
					}, false);
					activeShape = drawShape(dynamicPositions); //绘制动态图
					//线实体集合
					linesEntities.push(activeShape);
				}
				activeShapePoints.push(earthPosition);
				//点实体集合
				pointEntities.push(createPoint(earthPosition));
			}
		}
	}, Cesium.ScreenSpaceEventType.LEFT_CLICK);
	//鼠标移动
	handler.setInputAction(function (event: any) {
		if (Cesium.defined(floatingPoint)) {
			var newPosition = props.viewer.scene.pickPosition(event.endPosition);
			if (Cesium.defined(newPosition)) {
				floatingPoint.position.setValue(newPosition);
				activeShapePoints.pop();
				activeShapePoints.push(newPosition);
			}
		}
	}, Cesium.ScreenSpaceEventType.MOUSE_MOVE);
	handler.setInputAction(function () {
		if (drawing.value) {
			drawing.value = false;
			terminateShape();
		}
	}, Cesium.ScreenSpaceEventType.LEFT_DOUBLE_CLICK);
};
//绘制点
const createPoint = (worldPosition: any) => {
	var point = props.viewer.entities.add({
		position: worldPosition,
		point: {
			color: Cesium.Color.RED,
			pixelSize: 10,
			heightReference: Cesium.HeightReference.CLAMP_TO_GROUND,
		},
	});
	return point;
};
//绘制线
const drawShape = (positionData: any) => {
	var shape = props.viewer.entities.add({
		polyline: {
			with: 10,
			color: Cesium.Color.RED,
			positions: positionData,
			clampToGround: true,
		},
	});
	return shape;
};
//双击后处理数据
const terminateShape = () => {
	linesEntities.push(drawShape(activeShapePoints)); //绘制最终图
	//因双击会触发俩次单机事件，去除最后一个点重复绘制，并删除多余的点
	props.viewer.entities.remove(pointEntities[pointEntities.length - 1]);
	pointEntities.pop();
	dialogFormVisible.value = true; //弹出对话框
	props.viewer.entities.remove(floatingPoint); //去除动态点图形（当前鼠标点）
	props.viewer.entities.remove(activeShape); //去除动态图形
	floatingPoint = undefined;
	activeShape = undefined;
	activeShapePoints = [];
	props.viewer.trackedEntity = null;
};
/**
 * 点击确定
 */
const submitForm = async (formEl: any) => {
	const valid = await formEl.validate();
	if (valid) {
		//创建条目列表数据
		if (pointEntities.length) {
			for (const item of pointEntities) {
				const latitude = toDegrees(Cesium.Cartographic.fromCartesian(item.position._value).latitude);
				const longitude = toDegrees(Cesium.Cartographic.fromCartesian(item.position._value).longitude);
				customMarks.push({ longitude: longitude, latitude: latitude, height: form.height });
			}
		}
		addElectronicFence(form.title, customMarks);
		customMarks = [];
		//重置默认高度
		form.height = 300;
		dialogFormVisible.value = false;
		formEl.resetFields();
	}
};
/**
 * 添加列表数据
 */
var addElectronicFence = (name: string, positions: any) => {
	//点实体和线实体的集合
	entities.push({
		pointEntities: pointEntities,
		linesEntities: linesEntities,
	});
	dataList.push({
		id: Cesium.createGuid(),
		name: name,
		positions: positions,
	});
	pointEntities = [];
	linesEntities = [];
	//移除点击事件
	handler.removeInputAction(Cesium.ScreenSpaceEventType.LEFT_CLICK);
	handler.removeInputAction(Cesium.ScreenSpaceEventType.MOUSE_MOVE);
	handler.removeInputAction(Cesium.ScreenSpaceEventType.LEFT_DOUBLE_CLICK);
};
/**
 * 删除已绘制的图形
 */
const delEntity = (item: any, index: number) => {
	//如果删除的是当前飞行的路线 暂停飞行并删除飞机实体
	if (item.id == airplaneEntity.id) {
		stopFly();
		props.viewer.entities.remove(airplaneEntity);
	}
	//循环删除条目上的实体点  和  实体线
	for (const obj of entities[index].pointEntities) {
		props.viewer.entities.remove(obj);
	}
	for (const obj of entities[index].linesEntities) {
		props.viewer.entities.remove(obj);
	}
	//删除当前条目的数据
	entities.splice(index, 1);
	dataList.splice(index, 1);
};
const positionProperty = new Cesium.SampledPositionProperty();
// 时间的间隔
const timeStepInSeconds = 10;
var airplaneEntity: any;
//开始飞行
const startFly = (item: any, index: number) => {
	//当下个飞行前清除上次的飞行对象和路径
	if (airplaneEntity != null) {
		props.viewer.entities.remove(airplaneEntity);
	}
	//获取条目经纬度数据集合
	let flightData = item.positions;
	const totalSeconds = (flightData.length - 1) * timeStepInSeconds;
	// 设置起点时间
	const time = new Date('2020-03-09T23:10:00Z');
	const start = Cesium.JulianDate.fromDate(time);
	// 设置终点时间
	const stop = Cesium.JulianDate.addSeconds(start, totalSeconds, new Cesium.JulianDate());
	props.viewer.clock.startTime = start.clone();
	props.viewer.clock.stopTime = stop.clone();
	props.viewer.clock.currentTime = start.clone();
	// 设置进度条，从哪里开始到哪里结束
	props.viewer.timeline.zoomTo(start, stop);
	for (let i = 0; i  {
	// 	props.viewer.clock.shouldAnimate = true;
	// }, 5000);
};
//停止飞行
const stopFly = () => {
	props.viewer.clock.shouldAnimate = false;
};
//继续飞行
const continueFly = () => {
	props.viewer.clock.shouldAnimate = true;
};
// 弧度转角度
const toDegrees = (radians: any) => {
	return (radians * 180) / Math.PI;
};
// 角度转弧度
const toRadians = (degrees: any) => {
	return (degrees * Math.PI) / 180;
};
onMounted(() => {});
onUnmounted(() => {
	//清除绘制的内容
	props.viewer.entities.removeAll();
	if (handler != null) {
		handler.removeInputAction(Cesium.ScreenSpaceEventType.LEFT_CLICK);
		handler.removeInputAction(Cesium.ScreenSpaceEventType.LEFT_DOUBLE_CLICK);
	}
});


.page {
	position: absolute;
	right: 10px;
	top: 10px;
	color: #fff;
	background: #fff;
	padding: 10px;
	border-radius: 5px;
	width: 400px;
}