Web端cad测量面积的示例代码（网页CAD测量面积功能开发）
以下是一个web端cad测量面积的示例代码，基于Three.js和jQuery库实现：HTML部分：<!DOCTYPE html><html>
<head>
<meta charset="UTF-8">
<title>Web端CAD测量面积</title>
<style>
canvas {
width: 100%;
height: 100%;
display: block;
}
</style>
</head>
<body>
<div id="container"></div>
<div id="output">
<p>请点击屏幕选择点开始绘制，再次点击结束绘制并显示面积。</p >
</div>
<script src="https://cdn.bootcdn.net/ajax/libs/jquery/3.6.0/jquery.min.js"></script>
<script src="https://cdn.bootcdn.net/ajax/libs/three.js/r125/three.min.js"></script>
<script src="app.js"></script>
</body>
</html>
JavaScript部分（app.js）：
// 初始化Three.js场景、相机、渲染器
var scene = new THREE.Scene();
var camera = new THREE.PerspectiveCamera(
75, window.innerWidth/window.innerHeight, 0.1, 1000 );
var renderer = new THREE.WebGLRenderer({ antialias: true });
renderer.setSize( window.innerWidth, window.innerHeight );
document.getElementById("container").appendChild(renderer.domElement);
// 初始化画线的材质
var material = new THREE.LineBasicMaterial( { color: 0x0000ff } );
// 初始化测量变量
var linePoints = [];
var area = 0;
// 监听鼠标点击事件，绘制线段并计算面积
document.addEventListener( 'click', onClick, false );
function onClick( event ) {
// 获取鼠标点击坐标
var mouse = new THREE.Vector2();
mouse.x = ( event.clientX / window.innerWidth ) * 2 - 1;
mouse.y = - ( event.clientY / window.innerHeight ) * 2 + 1;
// 创建射线
var raycaster = new THREE.Raycaster();
raycaster.setFromCamera( mouse, camera );
// 计算射线和平面的交点，并绘制线段
var plane = new THREE.Plane(new THREE.Vector3(0, 0, 1), 0);
var intersection = new THREE.Vector3();
raycaster.ray.intersectPlane(plane, intersection);
linePoints.push(intersection);
if (linePoints.length > 1) {
var geometry = new THREE.BufferGeometry().setFromPoints(linePoints);
var line = new THREE.Line(geometry, material);
scene.add(line);
// 计算面积
var v1 = linePoints;
var v2 = linePoints;
area += (v1.x * v2.y - v2.x * v1.y) / 2;
$("#output").html("<p>面积: " + Math.abs(area).toFixed(2) + "</p >");
}
}
// 渲染场景
function animate() {
requestAnimationFrame( animate );
renderer.render( scene, camera );
}
animate();这个示例代码可以在浏览器中运行，并实现了在Three.js场景中绘制线段、计算面积等功能，在线CAD有很多其他功能，可以到梦想CAD控件官网查看。以上代码可以根据实际需求对代码进行修改和拓展。
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