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<html><head><meta charset="UTF-8"><title>three.js从入门到精通系列教程007 - three.js绘制空心扇形和实心扇形</title><script src="js/three.js"></script><script src="js/jquery.js"></script>
</head><body><p><button id="myButton1">绘制空心扇形</button><button id="myButton2">绘制实心扇形</button></p><center id="myContainer"></center><script>//创建渲染器var myRenderer = new THREE.WebGLRenderer({ antialias: true });myRenderer.setSize(window.innerHeight, window.innerHeight);$("#myContainer").append(myRenderer.domElement);//创建场景var myScene = new THREE.Scene();//设置场景背景色myScene.background = new THREE.Color('white');//创建透视相机var myCamera = new THREE.PerspectiveCamera(45, 1, 1, 1000);//设置相机位置myCamera.position.set(0, 0, 160);//设置相机视角myCamera.lookAt(myScene.position);var myCircle;//渲染扇形animate();function animate() {myRenderer.render(myScene, myCamera);//定时器requestAnimationFrame(animate);}//响应单击“绘制空心扇形”按钮$("#myButton1").click(function () {if (myCircle) myScene.remove(myCircle);//创建扇形几何体var myGeometry = new THREE.CircleGeometry(48, 1800, 0, Math.PI * 2 * 2 / 3);var myMaterial = new THREE.MeshBasicMaterial({color: 'green', wireframe: true});myCircle = new THREE.Line(myGeometry, myMaterial);myScene.add(myCircle);});//响应单击“绘制实心扇形”按钮$("#myButton2").click(function () {if (myCircle) myScene.remove(myCircle);var myGeometry = new THREE.CircleGeometry(48, 600, 0, Math.PI * 2 * 2 / 3);var myMaterial = new THREE.MeshBasicMaterial({ color: 'green' });;myCircle = new THREE.Mesh(myGeometry, myMaterial)myScene.add(myCircle);});</script>
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