Cesium + Vue 点击获取经纬度 & 气泡窗（三）
坐标系说明已经点击获取经纬度功能
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点击获取经纬度
步骤：
-
点击屏幕位置
-
获取该点所对应的球面交点坐标，两种方法
var earthPosition = viewer.camera.pickEllipsoid(event.position,viewer.scene.globe.ellipsoid); //视角穿过球面点的位置
var cartographic = Cesium.Cartographic.fromCartesian(earthPosition, viewer.scene.globe.ellipsoid, new Cesium.Cartographic());
var position = viewer.scene.pickPosition(event.position);
var cartographic = Cesium.Cartographic.fromCartesian(position);
两个方法获取的坐标有一定差异，但是最后转为屏幕坐标时却非常接近，个人感觉：相机位置（用户中心视角）和用户点击位置是有一定差异的，不知道具体怎么样，有兴趣的欢迎各位朋友与我讨论
- 转为经纬度
var lat = Cesium.Math.toDegrees(cartographic.latitude).toFixed(2);
var lng = Cesium.Math.toDegrees(cartographic.longitude).toFixed(2);
var height=(viewer.camera.positionCartographic.height/1000).toFixed(2);
- 把坐标位置填入弹窗中
- 将弹窗要显示的位置转为屏幕坐标，对应上述的两种方法
var winpos = viewer.scene.cartesianToCanvasCoordinates(earthPosition); //屏幕坐标
var screen = new Cesium.Cartesian2(event.position.x, event.position.y);
有些情况下，Cesium 的功能在 Vue 中无需通过某个判断条件来触发和关闭，因为每次执行的最后都可以选择将事件销毁。
6.完整代码
<!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>Hello World!</title>
<script src="Script/Cesium/Cesium.js"></script>
<script src="Script/jquery.min.js"></script>
<script src="Script/html2canvas.js"></script>
<script src="Script/canvas2image.js"></script>
<style>
@import url(Script/Cesium/Widgets/widgets.css);
html, body, #cesiumContainer {
width: 100%;
height: 100%;
margin: 0;
padding: 0;
overflow: hidden;
}
#infoboxx{
position: fixed;
/* top: 100px;
left: 100px; */
width: 200px;
height: 100px;
z-index: 99;
/* background-color: aquamarine; */
border: dodgerblue 1px solid;
color: black;
display: none;
}
#fid{
width: 200px;
height: 200px;
position: fixed;
top:50px;
left: 50px;
background-color: azure;
z-index: 10;
}
</style>
</head>
<body>
<div id="getall">
<div id="cesiumContainer" style="width: 50%; height: 50%;">
</div>
<div style="position: fixed;top: 10px;right: 10px;color: #fff;background-color:#00000088;" id="checkboxDiv" class="form1" >
<input type="radio" name="checkboxName" id="1" value="1" checked="checked"/>电子地图<br/>
<input type="radio" name="checkboxName" id="2" value="2" />遥感影像<br/>
</div>
<div id="infoboxx" class="el-popover">
</div>
<button onclick="getInfo()">查询</button>
<button onclick="getPic2()">截图</button>
<div id="addpic">
</div>
<div id="fid">
kik
</div>
</div>
<script>
//时间轴，时间等地球底部控件，不添加参数，为默认选项
//options对象做为配置参数
var viewer = new Cesium.Viewer("cesiumContainer", {
//放大镜图标，查找位置工具，查找到之后会将镜头对准找到的地址，默认使用bing地图
geocoder: false,
//房子图标，视角返回初始位置
homeButton: false,
//经纬网图标，选择视角的模式，有三种：3D，2D，哥伦布视图（2.5D)
sceneModePicker: false,
//地图图标，图层选择器，选择要显示的地图服务和地形服务
baseLayerPicker: false,
//问号图标，导航帮助按钮，显示默认的地图控制帮助
navigationHelpButton: false,
//动画器件，显示当前时间，允许跳转特定时间
animation: false,
//时间轴
timeline: false,
//全屏图标，全屏按钮
fullscreenButton: false,
//虚拟现实
vrButton: false,
//阴影
shadows: false,
//点击后显示详细信息
infoBox: false,
//展示数据版权属性
CreditsDisplay: false,
//imageryProvider : new Cesium.TileMapServiceImageryProvider({
// url : Cesium.buildModuleUrl('Assets/Textures/NaturalEarthII')
//})
animation: false, //是否显示动画控件
baseLayerPicker: false, //是否显示图层选择控件
geocoder: false, //是否显示地名查找控件
timeline: false, //是否显示时间线控件
sceneModePicker: false, //是否显示投影方式控件
navigationHelpButton: false, //是否显示帮助信息控件
infoBox: false, //是否显示点击要素之后显示的信息
imageryProvider: new Cesium.WebMapTileServiceImageryProvider({
url: "http://t0.tianditu.com/vec_w/wmts?service=wmts&request=GetTile&version=1.0.0&LAYER=vec&tileMatrixSet=w&TileMatrix={TileMatrix}&TileRow={TileRow}&TileCol={TileCol}&style=default&format=tiles&tk=d6a72a78a43a2c17294b72ab26354cd6",
layer: "tdtBasicLayer",
style: "default",
format: "image/jpeg",
tileMatrixSetID: "GoogleMapsCompatible"
})
});
viewer._cesiumWidget._creditContainer.style.display = "none";
viewer.imageryLayers.addImageryProvider(new Cesium.WebMapTileServiceImageryProvider({ //电子地图添加中文标记
url: "http://t0.tianditu.com/cia_w/wmts?service=wmts&request=GetTile&version=1.0.0&LAYER=cia&tileMatrixSet=w&TileMatrix={TileMatrix}&TileRow={TileRow}&TileCol={TileCol}&style=default.jpg&tk=d6a72a78a43a2c17294b72ab26354cd6",
layer: "tdtAnnoLayer",
style: "default",
format: "image/jpeg",
tileMatrixSetID: "GoogleMapsCompatible",
show: true
}));
var imgProider = new Cesium.WebMapTileServiceImageryProvider({ //电子地图添加中文标记
url: "http://t0.tianditu.com/img_w/wmts?service=wmts&request=GetTile&version=1.0.0&LAYER=img&tileMatrixSet=w&TileMatrix={TileMatrix}&TileRow={TileRow}&TileCol={TileCol}&style=default&format=tiles&tk=d6a72a78a43a2c17294b72ab26354cd6",
layer: "tdtAnnoLayer",
style: "default",
format: "image/jpeg",
tileMatrixSetID: "GoogleMapsCompatible",
show: true
})
var imgLayer = new Cesium.ImageryLayer(imgProider,{
show: false
});
viewer.imageryLayers.add(imgLayer);
var imgLabelProider = new Cesium.WebMapTileServiceImageryProvider({ //影像图添加中文标记
url: "http://t0.tianditu.com/cva_w/wmts?service=wmts&request=GetTile&version=1.0.0&LAYER=cva&tileMatrixSet=w&TileMatrix={TileMatrix}&TileRow={TileRow}&TileCol={TileCol}&style=default.jpg&tk=d6a72a78a43a2c17294b72ab26354cd6",
layer: "tdtAnnoLayer",
style: "default",
format: "image/jpeg",
tileMatrixSetID: "GoogleMapsCompatible"
})
var imgLabelLayer = new Cesium.ImageryLayer(imgLabelProider,{
show: false
});
viewer.imageryLayers.add(imgLabelLayer);
viewer.scene.debugShowFramesPerSecond = true; //显示帧率
$(document).ready(function(){
$('[name=checkboxName]').change(function(){
if(this.value == "1"){
imgLayer.show = false;
imgLabelLayer.show = false;
}else if(this.value == "2"){
imgLayer.show = true;
imgLabelLayer.show = true;
}
})
})
// 气泡窗
function getInfo(){
//开始查询
var handler3D = new Cesium.ScreenSpaceEventHandler(viewer.scene.canvas);
handler3D.setInputAction(function(event) {
var pick = viewer.scene.pick(event.position);
console.log(pick);
console.log("点击位置（屏幕坐标）"+event.position); //movement.position，屏幕坐标
var position = viewer.scene.pickPosition(event.position);
console.log("点击位置笛卡尔"+position);
var cartographicnew = Cesium.Cartographic.fromCartesian(position);
console.log("点击位置弧度" + cartographicnew);
console.log("+++++++++++++++++++++++++++++++++++++++++++++++++++++");
// 获取经纬度
var earthPosition = viewer.camera.pickEllipsoid(event.position,viewer.scene.globe.ellipsoid); //视角穿过球面点的位置
var cartographic = Cesium.Cartographic.fromCartesian(earthPosition, viewer.scene.globe.ellipsoid, new Cesium.Cartographic());
console.log("视角中心笛卡尔" + earthPosition);
console.log("视角中心弧度" + cartographic);
var lat = Cesium.Math.toDegrees(cartographic.latitude).toFixed(2);
var lng = Cesium.Math.toDegrees(cartographic.longitude).toFixed(2);
// var height=cartographic.height.toFixed(2);
var height=(viewer.camera.positionCartographic.height/1000).toFixed(2);
console.log("---------------------------------------------------------------");
// 创建气泡窗体
var info = `经度：${lng} </br>
纬度：${lat} </br>
高度：${height}
`
$("#infoboxx").empty();
$("#infoboxx").append(info);
$("#infoboxx").show();
// 气泡位置
var winpos = viewer.scene.cartesianToCanvasCoordinates(earthPosition); //屏幕坐标
console.log("屏幕坐标1:"+winpos);
var bubble = document.getElementById("infoboxx");
bubble.style.left = winpos.x + 20 + "px";
bubble.style.top = winpos.y + 50 + "px";
// 气泡位置2
var obj = {position:event.position};
var c = new Cesium.Cartesian2(obj.position.x, obj.position.y);
console.log("屏幕坐标2:"+c);
// var x = c.x-1000;
// var y = c.y-430 ;
// $('#infoboxx').css('transform', 'translate3d(' + x + 'px, ' + y + 'px, 0)'); //设置点击时 div弹出来的位置
},Cesium.ScreenSpaceEventType.LEFT_CLICK);
// // 监听位置
// viewer.scene.postRender.addEventListener(function(e) {
// if (winpos) {
// var winpos = viewer.scene.cartesianToCanvasCoordinates(
// earthPosition
// );
// var bubble = document.getElementsByClassName("el-popover")[0];
// var poph = bubble.offsetHeight;
// bubble.style.left = winpos.x + 20 + "px";
// bubble.style.top = winpos.y + 50 - poph + "px";
// }
// });
//结束查询
handler3D.setInputAction(function(movement) {
handler3D = handler3D.destroy(); // 销毁整个鼠标事件
$("#infoboxx").hide();
}, Cesium.ScreenSpaceEventType.RIGHT_CLICK);
}
</script>
</body>
</html>
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