我需要一个可以在cesium上可以随意绘制多边形,并且显示绘制出来的多边形的等值面的一个完整的deom代码
时间: 2023-03-04 10:53:37 AIGC 浏览: 184
以下是一个在Cesium上绘制多边形并显示等值面的示例代码。这个代码需要使用Cesium库,以及另一个库turf.js来进行多边形的处理。该代码允许用户在地球上任意绘制多边形,并计算多边形内的等值面。请注意,这个代码可能需要一些修改,以适应您的具体情况。
```html
<!DOCTYPE html>
<html lang="en">
<head>
<title>Cesium Draw Polygon Example</title>
<script src="https://cesium.com/downloads/cesiumjs/releases/1.74/Build/Cesium/Cesium.js"></script>
<script src="https://unpkg.com/@turf/[email protected]/turf.min.js"></script>
<style>
@import url(https://cesium.com/downloads/cesiumjs/releases/1.74/Build/Cesium/Widgets/widgets.css);
#cesiumContainer {
width: 100%;
height: 100%;
margin: 0;
padding: 0;
overflow: hidden;
position: absolute;
top: 0;
left: 0;
}
</style>
</head>
<body>
<div id="cesiumContainer"></div>
<script>
var viewer = new Cesium.Viewer('cesiumContainer');
var scene = viewer.scene;
var primitives = scene.primitives;
// Create an entity for the polygon
var polygon = new Cesium.Entity({
polygon: {
hierarchy: new Cesium.CallbackProperty(function() {
return new Cesium.PolygonHierarchy(points);
}, false),
material: Cesium.Color.WHITE.withAlpha(0.5),
outline: true,
outlineColor: Cesium.Color.BLACK
}
});
viewer.entities.add(polygon);
// Create an array to store the points of the polygon
var points = [];
// Create a handler for drawing the polygon
var handler = new Cesium.ScreenSpaceEventHandler(scene.canvas);
handler.setInputAction(function(click) {
// Get the current mouse position
var position = scene.pickPosition(click.position);
// Convert the position to a cartographic coordinate
var cartographic = Cesium.Cartographic.fromCartesian(position);
var longitude = Cesium.Math.toDegrees(cartographic.longitude);
var latitude = Cesium.Math.toDegrees(cartographic.latitude);
// Add the point to the array
points.push(Cesium.Cartesian3.fromDegrees(longitude, latitude));
// Update the polygon entity
polygon.polygon.hierarchy = new Cesium.CallbackProperty(function() {
return new Cesium.PolygonHierarchy(points);
}, false);
}, Cesium.ScreenSpaceEventType.LEFT_CLICK);
// Create a handler for clearing the polygon
handler.setInputAction(function(click) {
// Reset the points array
points = [];
// Update the polygon entity
polygon.polygon.hierarchy = new Cesium.CallbackProperty(function() {
return new Cesium.PolygonHierarchy(points);
}, false);
}, Cesium.ScreenSpaceEventType.RIGHT_CLICK);
// Create a handler for computing the isoline
handler.setInputAction(function(click) {
if (points.length > 2) {
// Convert the points to a polygon feature
var polygonFeature = turf.polygon([points.map(function(cartesian) {
var cartographic = Cesium.Cartographic.fromCartesian(cartesian);
return [Cesium.Math.toDegrees(cartographic.longitude), Cesium.Math.toDegrees
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