# cesium-ol二三维联动(鹰眼图)
cesium除了使用两个viewer联动的方式实现鹰眼图，还有其他方式
这里我使用cesium和ol联动的方式实现鹰眼图（也可以实现简单的二三维联动效果）
# 实现思路
- 监听cesium地图的移动
- 当移动视图时，计算cesium视图范围，并传递给ol
- 监听ol地图移动，当ol移动时，计算ol的视图范围
- 传递给cesium（cesium会垂直移动）
# 实现代码
<!DOCTYPE html>
<html lang="en">
<head>
<!-- Use correct character set. -->
<meta charset="utf-8" />
<!-- Tell IE to use the latest, best version. -->
<meta http-equiv="X-UA-Compatible" content="IE=edge" />
<!-- Make the application on mobile take up the full browser screen and disable user scaling. -->
<meta
name="viewport"
content="width=device-width, initial-scale=1, maximum-scale=1, minimum-scale=1, user-scalable=no"
/>
<title>二三维联动</title>
<link href="https://cdn.bootcdn.net/ajax/libs/openlayers/4.6.5/ol.css" rel="stylesheet">
<script src="../Cesium-1.89/Build/Cesium/Cesium.js"></script>
<script src="https://cdn.bootcdn.net/ajax/libs/openlayers/4.6.5/ol.js"></script>
<script src="Cesium2DLink3DUtil.js"></script>
<style>
@import url(../Cesium-1.89/Build/Cesium/Widgets/widgets.css);
html,
body,
.main-view,
#cesiumContainer {
width: 100%;
height: 100%;
margin: 0;
padding: 0;
overflow: hidden;
}
.toolbox {
position: absolute;
top: 49%;
left: 30px;
z-index: 99;
display: flex;
flex-direction: column;
justify-content: space-around;
}
.tool-item {
background-color: #303336;
cursor: pointer;
}
#eye {
position: absolute;
width: 20%;
height: 20%;
bottom: 0;
right: 0;
z-index: 999;
border: solid blue 1px;
}
</style>
</head>
<body>
<div class="main-view" style="position: relative;display: flex">
<div class="toolbox">
<button id='point' style="color: white;" class="tool-item">联动</button>
<button id='clear' style="color: white;" class="tool-item">关闭</button>
</div>
<div id="cesiumContainer"></div>
</div>
</body>
<script type="module">
let viewer = new Cesium.Viewer('cesiumContainer', {
imageryProvider: new Cesium.ArcGisMapServerImageryProvider({
url : 'https://services.arcgisonline.com/ArcGIS/rest/services/World_Imagery/MapServer',
}),
geocoder: false,
homeButton: false,
sceneModePicker: false,
baseLayerPicker: false,
navigationHelpButton: false,
animation: false,
timeline: false,
fullscreenButton: false,
vrButton: false,
mapProjection: new Cesium.WebMercatorProjection(),
});
viewer._cesiumWidget._creditContainer.style.display = 'none'; // 隐藏版权
var linkUtil = new Cesium2DLinkage3DUtil()
document.getElementById('point').onclick = function(){
if(linkUtil.isActive)return
linkUtil.active(viewer)
}
document.getElementById('clear').onclick = function(){
linkUtil.deactive()
}
</script>
</html>
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# 核心js方法
/**
* 二三维联动，二维openlayers,三维Cesium
*/
class Cesium2DLinkage3DUtil {
constructor(mapId = 'eye') {
this.mapId = mapId
this.isActive = false
this.isIn2DMapFlag = false;
this.mouseMoveEvent = this.mouseMoveEvent.bind(this)
this.getViewCameraRectrange = this.getViewCameraRectrange.bind(this)
this.changeCenterListener = this.changeCenterListener.bind(this)
}
/**
* 初始化地图容器，插入三维容器的左侧
*/
init2DDiv() {
this.mapDiv = document.createElement('div');
this.mapDiv.setAttribute('id', this.mapId)
// insertBefore
const viewerContainer = this.viewer.cesiumWidget.container.parentElement.parentElement
viewerContainer.parentNode.insertBefore(this.mapDiv, viewerContainer)
}
/**
* 初始化地图视图
*/
init2DMap() {
//普通地图
const tiandituVecLayer = new ol.layer.Tile({
title: 'generalMap',
source: new ol.source.XYZ({
url: 'http://t3.tianditu.com/DataServer?T=vec_w&x={x}&y={y}&l={z}&tk=token',
crossOrigin: 'anonymous'
}),
visible: true
});
//普通地图标记
const tiandituCvaLayer = new ol.layer.Tile({
title: 'generalMapZj',
source: new ol.source.XYZ({
url: 'http://t3.tianditu.com/DataServer?T=cva_w&x={x}&y={y}&l={z}&tk=token',
crossOrigin: 'anonymous'
}),
visible: true
});
this.olMap = new ol.Map({
layers: [tiandituVecLayer,tiandituCvaLayer],
target: this.mapId,
view: new ol.View({
center: [13818313.960985335, 6519709.935426011],
zoom: 8,
projection: 'EPSG:3857',
maxZoom: 22
}),
// 设置地图控件，默认的三个控件都不显示
controls: ol.control.defaults({
attribution: false,
rotate: false,
zoom: false
}),
});
this.olMap.updateSize()
}
/**
* 二维监听事件处理
*/
changeCenterListener() {
if (this.isIn2DMapFlag) {
const bounds = this.olMap.getView().calculateExtent();
const boundsTansform = ol.proj.transformExtent(bounds, 'EPSG:3857', 'EPSG:4326')
this.viewer.camera.setView({
heading : Cesium.Math.toRadians(120.0),//方向
pitch : Cesium.Math.toRadians(-10),//倾斜角度
roll: this.viewer.camera.roll,
destination: Cesium.Rectangle.fromDegrees(
boundsTansform[0],
boundsTansform[1],
boundsTansform[2],
boundsTansform[3],
)
});
}
}
/**
* 三维监听事件处理
*/
getViewCameraRectrange() {
const rectangle = this.viewer.camera.computeViewRectangle();
// 弧度转为经纬度
const west = (rectangle.west / Math.PI) * 180;
const north = (rectangle.north / Math.PI) * 180;
const east = (rectangle.east / Math.PI) * 180;
const south = (rectangle.south / Math.PI) * 180;
//三维联动二维界面
if (!this.isIn2DMapFlag) {
if (north > 87 && south < -87) {
const center = this.getCenterPosition(this.viewer);
this.olMap.getView().setZoom(0);
this.olMap.getView().setCenter(ol.proj.transform([center.lon, center.lat], 'EPSG:4326', 'EPSG:3857'));
} else {
this.olMap.getView().fit(ol.proj.transformExtent([west, south, east, north], 'EPSG:4326', 'EPSG:3857'));
}
}
}
/**
* 判断鼠标是否在二维地图
* @param x
* @param y
* @return {boolean}
*/
isMouseIn2DMap(x, y) {
let y1 = this.mapDiv.offsetTop; //div上面两个的点的y值
let y2 = y1 + this.mapDiv.clientHeight; //div下面两个点的y值
let x1 = this.mapDiv.offsetLeft; //div左边两个的点的x值
let x2 = x1 + this.mapDiv.clientWidth; //div右边两个点的x的值
return !(x < x1 || x > x2 || y < y1 || y > y2);
}
addListener() {
this.olMap.getView().on("change:center", this.changeCenterListener);
this.olMap.updateSize()
this.viewer.cesiumWidget.container.parentElement.parentElement.parentElement.addEventListener('mousemove', this.mouseMoveEvent)
this.viewer.scene.preRender.addEventListener(this.getViewCameraRectrange);
}
removeListener(){
this.olMap.getView().un("change:center", this.changeCenterListener);
this.viewer.scene.preRender.removeEventListener(this.getViewCameraRectrange)
this.viewer.cesiumWidget.container.parentElement.parentElement.parentElement.removeEventListener('mousemove', this.mouseMoveEvent)
this.mapDiv.style.width = '0%';
this.mapDiv.parentNode.removeChild(this.mapDiv)
this.olMap = null;
}
mouseMoveEvent(e) {
this.isIn2DMapFlag = this.isMouseIn2DMap(e.pageX, e.pageY);
}
getCenterPosition(viewer) {
const result = viewer.camera.pickEllipsoid(
new Cesium.Cartesian2(
viewer.canvas.clientWidth / 2,
viewer.canvas.clientHeight / 2
)
);
const curPosition = Cesium.Ellipsoid.WGS84.cartesianToCartographic(result);
const lon = (curPosition.longitude * 180) / Math.PI;
const lat = (curPosition.latitude * 180) / Math.PI;
return {
lon: lon,
lat: lat
};
}
active(viewer) {
this.viewer = viewer
this.isActive = true
this.init2DDiv()
this.init2DMap()
this.addListener()
}
deactive() {
this.removeListener()
this.isActive = false
this.viewer = undefined
}
}
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# 实现效果
