Three.js绘制一个3d饼图
时间: 2024-05-16 08:13:58 浏览: 7
要使用Three.js绘制一个3D饼图,可以按照以下步骤进行:
1. 创建一个Three.js场景和相机。
```javascript
var scene = new THREE.Scene();
var camera = new THREE.PerspectiveCamera( 75, window.innerWidth / window.innerHeight, 0.1, 1000 );
camera.position.z = 5;
```
2. 创建一个饼图的几何体。
```javascript
var geometry = new THREE.CircleGeometry( 2, 32 );
```
3. 创建一个材质,并将其应用到几何体上。
```javascript
var material = new THREE.MeshBasicMaterial( { color: 0xffffff } );
var pie = new THREE.Mesh( geometry, material );
scene.add( pie );
```
4. 为每个饼块分配颜色和角度,并将它们按比例旋转。
```javascript
var colors = [0xff0000, 0x00ff00, 0x0000ff];
var angles = [Math.PI / 4, Math.PI / 2, Math.PI / 4];
var totalAngle = 0;
for (var i = 0; i < angles.length; i++) {
var material = new THREE.MeshBasicMaterial( { color: colors[i] } );
var geometry = new THREE.CircleGeometry( 2, 32, totalAngle, angles[i] );
var slice = new THREE.Mesh( geometry, material );
slice.rotation.z = totalAngle + angles[i] / 2;
pie.add( slice );
totalAngle += angles[i];
}
```
5. 渲染场景。
```javascript
function animate() {
requestAnimationFrame( animate );
pie.rotation.y += 0.01;
renderer.render( scene, camera );
}
animate();
```
完整的代码示例:
```javascript
var scene = new THREE.Scene();
var camera = new THREE.PerspectiveCamera( 75, window.innerWidth / window.innerHeight, 0.1, 1000 );
camera.position.z = 5;
var renderer = new THREE.WebGLRenderer();
renderer.setSize( window.innerWidth, window.innerHeight );
document.body.appendChild( renderer.domElement );
var geometry = new THREE.CircleGeometry( 2, 32 );
var material = new THREE.MeshBasicMaterial( { color: 0xffffff } );
var pie = new THREE.Mesh( geometry, material );
scene.add( pie );
var colors = [0xff0000, 0x00ff00, 0x0000ff];
var angles = [Math.PI / 4, Math.PI / 2, Math.PI / 4];
var totalAngle = 0;
for (var i = 0; i < angles.length; i++) {
var material = new THREE.MeshBasicMaterial( { color: colors[i] } );
var geometry = new THREE.CircleGeometry( 2, 32, totalAngle, angles[i] );
var slice = new THREE.Mesh( geometry, material );
slice.rotation.z = totalAngle + angles[i] / 2;
pie.add( slice );
totalAngle += angles[i];
}
function animate() {
requestAnimationFrame( animate );
pie.rotation.y += 0.01;
renderer.render( scene, camera );
}
animate();
```