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cake.html
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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8" />
<meta name="viewport" content="width=device-width, initial-scale=1.0" />
<title>Cake</title>
<style>
#cake {
height: 500px;
width: 500px;
background-color: black;
}
</style>
</head>
<body>
<div id="cake"></div>
<script type="module">
import * as THREE from './node_modules/three/build/three.module.js';
import ThreeBase from './ThreeBase.js';
import {
getShadowColor,
getBasicMaterial,
getTextArraySprite,
getDrawColors
} from './util.js';
class Cake extends ThreeBase {
constructor() {
super();
this.isStats = false;
this.isAxis = false;
this.rotateAngle = 0;
this.count = 0;
this.time = 0;
this.currentTextMesh = null;
}
createChart(that) {
this.that = that;
if (this.group) {
this.cleanObj(this.group);
this.group = null;
}
if (that.data.length == 0) {
return;
}
this.cLen = 3;
//获取渐变色
this.colors = getDrawColors(that.colors, this.cLen);
//从小到大排序
that.data = that.data.sort((a, b) => a.value - b.value);
let { baseHeight, radius, perHeight, maxHeight, fontColor, fontSize } = that;
let sum = 0;
let min = Number.MAX_SAFE_INTEGER;
let max = 0;
for (let i = 0; i < that.data.length; i++) {
let item = that.data[i];
sum += item.value;
if (min > item.value) {
min = item.value;
}
if (max < item.value) {
max = item.value;
}
}
let startRadius = 0;
let valLen = max - min;
let allHeight = maxHeight - baseHeight;
let axis = new THREE.Vector3(1, 0, 0);
let group = new THREE.Group();
this.group = group;
this.scene.add(group);
for (let idx = 0; idx < that.data.length; idx++) {
let objGroup = new THREE.Group();
objGroup.name = 'group' + idx;
let item = that.data[idx];
//角度范围
let angel = (item.value / sum) * Math.PI * 2;
//高度与值的映射
let h = baseHeight + ((item.value - min) / valLen) * allHeight;
//每个3D组成块组成：扇形柱体加两片矩形面
if (item.value) {
//创建渐变色材质组
let cs = this.colors[idx % this.colors.length];
let geometry = new THREE.CylinderGeometry(
radius,
radius,
h,
24,
24,
false,
startRadius, //开始角度
angel //扇形角度占有范围
);
let ms = [];
for (let k = 0; k < this.cLen - 1; k++) {
ms.push(getBasicMaterial(THREE, cs[k]));
}
//给不同面的设定对应的材质索引
geometry.faces.forEach((f, fIdx) => {
if (f.normal.y == 0) {
//上面和底面
geometry.faces[fIdx].materialIndex = 0;
} else {
//侧面
geometry.faces[fIdx].materialIndex = 1;
}
});
//扇形圆柱
let mesh = new THREE.Mesh(geometry, ms);
mesh.position.y = h * 0.5;
mesh.name = 'p' + idx;
objGroup.add(mesh);
const g = new THREE.PlaneGeometry(radius, h);
let m = getBasicMaterial(THREE, cs[this.cLen - 1]);
//注意图形开始角度和常用的旋转角度差90度
//封口矩形1
let r1 = startRadius + Math.PI * 0.5;
const plane = new THREE.Mesh(g, m);
plane.position.y = h * 0.5;
plane.position.x = 0;
plane.position.z = 0;
plane.name = 'c' + idx;
plane.rotation.y = r1;
plane.translateOnAxis(axis, -radius * 0.5);
objGroup.add(plane);
//封口矩形2
let r2 = startRadius + angel + Math.PI * 0.5;
const plane1 = new THREE.Mesh(g, m);
plane1.position.y = h * 0.5;
plane1.position.x = 0;
plane1.position.z = 0;
plane1.name = 'b' + idx;
plane1.rotation.y = r2;
plane1.translateOnAxis(axis, -radius * 0.5);
objGroup.add(plane1);
//显示label
if (that.isLabel) {
let textList = [
{ text: item.name, color: fontColor },
{ text: item.value + that.suffix, color: fontColor }
];
const { mesh: textMesh } = getTextArraySprite(THREE, textList, fontSize);
textMesh.name = 'f' + idx;
//y轴位置
textMesh.position.y = maxHeight + baseHeight;
//x,y轴位置
let r = startRadius + angel * 0.5 + Math.PI * 0.5;
textMesh.position.x = -Math.cos(r) * radius;
textMesh.position.z = Math.sin(r) * radius;
if (this.that.isAnimate) {
if (idx == 0) {
textMesh.visible = true;
} else {
textMesh.visible = false;
}
}
objGroup.add(textMesh);
}
group.add(objGroup);
}
startRadius = angel + startRadius;
}
//图形居中，视角设置
this.setModelCenter(group, that.viewControl);
}
animateAction() {
if (this.that?.isAnimate && this.group) {
this.time++;
this.rotateAngle += 0.01;
//物体自旋转
this.group.rotation.y = this.rotateAngle;
//标签显隐切换
if (this.time > 90) {
if (this.currentTextMesh) {
this.currentTextMesh.visible = false;
}
let textMesh = this.scene.getObjectByName('f' + (this.count % this.that.data.length));
textMesh.visible = true;
this.currentTextMesh = textMesh;
this.count++;
this.time = 0;
}
if (this.rotateAngle > Math.PI * 2) {
this.rotateAngle = 0;
}
}
}
}
let cakeChart = new Cake();
cakeChart.initThree(document.getElementById('cake'));
cakeChart.createChart({
//颜色
colors: ['#fcc02a', '#f16b91', '#187bac'],
//数据
data: [
{ name: '小学', value: 100 },
{ name: '中学', value: 200 },
{ name: '大学', value: 300 }
],
//是否显示标签
isLabel: true,
//最大高度
maxHeight: 20,
//基础高度
baseHeight: 10,
//半径
radius: 30,
//单位后缀
suffix: '',
//字体大小
fontSize: 10,
//字体颜色
fontColor: 'rgba(255,255,255,1)',
//开启动画
isAnimate: false,
//视角控制
viewControl: {
autoCamera: true,
width: 1,
height: 1.6,
depth: 1,
centerX: 1,
centerY: 1,
centerZ: 1
}
});
</script>
</body>
</html>