【超图+CESIUM】【基础API使用示例】42、超图｜CESIUM - 绘制编辑线段｜读取kml文件绘制编辑｜导出kml线段数据
前言
缺少前置学习使用资料，请自行查阅：[https://blog.csdn.net/weixin_44402694/article/details/123110136](https://blog.csdn.net/weixin_44402694/article/details/123110136)
以下示例使用到的公共静态资料，不建议下载，建议官网自行下载超图Build资源，示例所涉及图片会在示例使用到时提供出来。如有需要可下载：[https://download.csdn.net/download/weixin_44402694/82180350](https://download.csdn.net/download/weixin_44402694/82180350)。
绘制编辑线段｜读取kml文件绘制编辑｜导出kml线段数据。
使用
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效果
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完整代码
<html lang="en">
<head>
<meta charset="UTF-8" />
<meta http-equiv="X-UA-Compatible" content="IE=edge" />
<meta name="viewport" content="width=device-width, initial-scale=1.0" />
<title>线 - 绘制编辑保存title>
<link href="./public/Build/Cesium/Widgets/widgets.css" rel="stylesheet" />
<script
type="text/javascript"
src="./public/Build/Cesium/Cesium.js"
>script>
<style>
* {
margin: 0;
padding: 0;
}
html,
body,
#cesium-container {
width: 100%;
height: 100%;
}
.panel {
position: fixed;
left: 10px;
top: 10px;
z-index: 1;
background-color: #fff;
padding: 10px;
}
.panel .btn {
cursor: pointer;
}
.panel .check {
cursor: pointer;
}
.tooltip {
position: fixed;
left: 0;
top: 0;
background: rgba(0, 0, 0, 0.4);
padding: 4px;
border-radius: 4px;
display: none;
z-index: 1;
color: #fff;
}
style>
head>
<body>
<div id="cesium-container" />
<div class="panel">
<p class="btn">绘制并编辑线p>
<p class="btn">保存KML文件p>
<p class="btn">打开KML文件p>
<p class="btn">清空p>
<p class="check">是否编辑Z值 <input type="checkbox" />p>
div>
<div class="tooltip">div>
<input type="file" accept=".kml" class="file" style="display: none;">
<script>
let viewer, scene, editHandler
window.onload = function () {
viewer = new Cesium.Viewer('cesium-container', {
sceneModePicker: true,
navigation: false,
selectionIndicator: false, // 聚焦失效
})
scene = viewer.scene
setS3MServiceHandler()
initBindDrawEventHandler()
}
// 初始化绑定按钮的绘制事件
function initBindDrawEventHandler() {
const btns = document.querySelectorAll('.panel .btn')
btns[0].addEventListener('click', () => {
drawLine(handleEdit)
})
btns[1].addEventListener('click', () => {
handleSaveClick()
})
btns[2].addEventListener('click', () => {
handleOpenClick()
})
btns[3].addEventListener('click', () => {
if (editHandler) {
editHandler.clear()
editHandler.deactivate()
}
viewer.entities.removeAll()
let dataSources = viewer.dataSources
dataSources.removeAll()
})
const check = document.querySelector('.check input')
check.addEventListener('click', () => {
editHandler && (editHandler.isEditZ = check.checked)
})
}
// 画线
function drawLine(callback) {
const positions = []
let poly, entity, drawingEntity
let isDrawing = true
let handler = new Cesium.ScreenSpaceEventHandler(viewer.canvas)
let polyLineEntity = (function () {
function _(positions) {
// polyline 配置
this.options = {
name: 'polyline',
polyline: {
show: true,
positions: [],
material: Cesium.Color.GREEN,
width: 3,
},
}
this.positions = positions
this._init()
}
_.prototype._init = function () {
let _self = this
this.options.polyline.positions = new Cesium.CallbackProperty(
function () {
return _self.positions
},
false
)
drawingEntity = entity = viewer.entities.add(this.options)
}
return _
})()
handler.setInputAction(function (movement) {
let ent = viewer.selectedEntity
// 当前选中的entity不是绘制的entity，就return。实现绘制时也能选择
if (ent && drawingEntity !== ent) {
return
}
isDrawing = true
let cartesian = viewer.scene.pickPosition(movement.position)
if (positions.length == 0) {
positions.push(cartesian.clone())
}
positions.push(cartesian)
}, Cesium.ScreenSpaceEventType.LEFT_CLICK)
handler.setInputAction((movement) => {
let cartesian = viewer.scene.pickPosition(movement.endPosition)
if (positions.length >= 2) {
if (!Cesium.defined(poly)) {
poly = new polyLineEntity(positions)
} else {
if (cartesian != undefined) {
positions.pop()
positions.push(cartesian)
}
}
}
}, Cesium.ScreenSpaceEventType.MOUSE_MOVE)
handler.setInputAction((movement) => {
positions.pop()
isDrawing = false
handler = handler && handler.destroy() // clear and empty the handler.
callback && callback(entity)
// 继续绘制
// this.drawLine(this.handleEdit);
}, Cesium.ScreenSpaceEventType.RIGHT_CLICK)
}
// 编辑
function handleEdit(entity) {
if (!entity) {
editHandler && editHandler.deactivate()
return
}
if (!editHandler) {
editHandler = new Cesium.EditHandler(viewer, entity)
const check = document.querySelector('.check input')
editHandler.isEditZ = check.checked // 是否开启编辑Z值
editHandler.activate()
} else {
editHandler.deactivate()
editHandler.setEditObject(entity)
editHandler.activate()
}
}
// 下载文件
function handleSaveClick() {
let funDownload = function (content, filename) {
let eleLink = document.createElement('a')
eleLink.download = filename
eleLink.style.display = 'none'
// 字符内容转变成blob地址
let blob = new Blob([content])
eleLink.href = URL.createObjectURL(blob)
// 触发点击
document.body.appendChild(eleLink)
eleLink.click()
// 然后移除
document.body.removeChild(eleLink)
}
let entities = new Cesium.EntityCollection()
let dataSources = viewer.dataSources
for (let i = 0, j = dataSources.length; i < j; i++) {
for (let v of dataSources.get(i).entities.values) {
entities.add(v)
}
}
for (let v of viewer.entities.values) {
entities.add(v)
}
if (entities.values.length) {
let promise = Cesium.exportKml({ entities: entities })
promise.then(function (e) {
funDownload(e.kml, new Date().getTime() + '.kml')
})
} else {
alert('当前场景没有entities实体')
}
}
// 打开文件
function handleOpenClick() {
let fileInput = document.querySelector('.file')
fileInput.onchange = function (evt) {
let files = evt.target.files
if (files.length > 0) {
let file = evt.target.files[0]
let fileReader = new FileReader()
// console.log(file)
fileReader.onload = function () {
viewer.dataSources
.add(
Cesium.KmlDataSource.load(new Blob([this.result]), {
camera: viewer.scene.camera,
canvas: viewer.scene.canvas,
})
)
.then(function (kmlDataSource) {
let entities = kmlDataSource.entities
let item = entities.values[entities.values.length - 1]
self.handleEdit(item)
viewer.zoomTo(entities)
})
fileInput = null
fileReader = null
}
fileReader.readAsText(file)
}
fileInput.value = null
}
fileInput.click()
}
// 添加由supermap iserver上发布的s3m服务
function setS3MServiceHandler() {
const promise = viewer.scene.open(
'http://www.supermapol.com/realspace/services/3D-NewCBD/rest/realspace'
)
Cesium.when(promise, (layers) => {
layers.forEach((l) => {
l.selectEnabled = false // 不允许模型被选中
})
})
}
script>
body>
html>