Vue中如何实现3D标签云
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今天小编给大家分享一下Vue中如何实现3D标签云的相关知识点，内容详细，逻辑清晰，相信大部分人都还太了解这方面的知识，所以分享这篇文章给大家参考一下，希望大家阅读完这篇文章后有所收获，下面我们一起来了解一下吧。
预览:
代码:
页面部分:
<template>
<div class="tagcloud-all"
ref="tagcloudall">
<a v-for="item in tagList" :href="item.url" rel="external nofollow" :style=""color:" + item.color + ";top: 0;left: 0;filter:none;"">{{item.name}}</a>
</div>
</template>CSS部分:
// 标签云
.tagcloud-all {
position: relative;
a {
position: absolute;
top: 0px;
left: 0px;
color: #fff;
font-weight: bold;
text-decoration: none;
padding: 3px 6px;
&:hover {
color: #FF0000;
letter-spacing: 2px;
}
}
}JS部分:
export default {
name: "tagcloud",
data() {
return {
tagList: [],
radius: 120,
dtr: Math.PI / 180,
d: 300,
mcList: [],
active: false,
lasta: 1,
lastb: 1,
distr: true,
tspeed: 10,
size: 250,
mouseX: 0,
mouseY: 0,
howElliptical: 1,
oList: null,
oA: null,
sa: 0,
ca: 0,
sb: 0,
cb: 0,
sc: 0,
cc: 0
}
},
methods: {
// 生成随机数
getRandomNum() {
return Math.floor(Math.random() * (255 + 1));
},
// 三角函数角度计算
sineCosine(a, b, c) {
this.sa = Math.sin(a * this.dtr);
this.ca = Math.cos(a * this.dtr);
this.sb = Math.sin(b * this.dtr);
this.cb = Math.cos(b * this.dtr);
this.sc = Math.sin(c * this.dtr);
this.cc = Math.cos(c * this.dtr);
},
// 设置初始定位
positionAll() {
this.$nextTick(() => { // 注意: 所有的在onReady方法中执行的方法都需要$nextTick确保所有的标签都已经渲染
var phi = 0;
var theta = 0;
var max = this.mcList.length;
var aTmp = [];
var oFragment = document.createDocumentFragment();
// 随机排序
for (let i = 0; i < this.tagList.length; i++) {
aTmp.push(this.oA[i]);
}
aTmp.sort(() => {
return Math.random() < 0.5 ? 1 : -1;
});
for (let i = 0; i < aTmp.length; i++) {
oFragment.appendChild(aTmp[i]);
}
this.oList.appendChild(oFragment);
for (let i = 1; i < max + 1; i++) {
if (this.distr) {
phi = Math.acos(-1 + (2 * i - 1) / max);
theta = Math.sqrt(max * Math.PI) * phi;
} else {
phi = Math.random() * (Math.PI);
theta = Math.random() * (2 * Math.PI);
}
// 坐标变换
this.mcList[i - 1].cx = this.radius * Math.cos(theta) * Math.sin(phi);
this.mcList[i - 1].cy = this.radius * Math.sin(theta) * Math.sin(phi);
this.mcList[i - 1].cz = this.radius * Math.cos(phi);
this.oA[i - 1].style.left = this.mcList[i - 1].cx + this.oList.offsetWidth / 2 - this.mcList[i - 1].offsetWidth / 2 + "px";
this.oA[i - 1].style.top = this.mcList[i - 1].cy + this.oList.offsetHeight / 2 - this.mcList[i - 1].offsetHeight / 2 + "px";
}
})
},
// 坐标更新 让标签动起来
update() {
this.$nextTick(() => { // 注意: 所有的在onReady方法中执行的方法都需要$nextTick确保所有的标签都已经渲染
var a;
var b;
if (this.active) {
a = (-Math.min(Math.max(-this.mouseY, -this.size), this.size) / this.radius) * this.tspeed;
b = (Math.min(Math.max(-this.mouseX, -this.size), this.size) / this.radius) * this.tspeed;
} else {
a = this.lasta * 0.98;
b = this.lastb * 0.98;
}
this.lasta = a;
this.lastb = b;
if (Math.abs(a) <= 0.01 && Math.abs(b) <= 0.01) {
return
}
var c = 0;
this.sineCosine(a, b, c);
for (var j = 0; j < this.mcList.length; j++) {
var rx1 = this.mcList[j].cx;
var ry1 = this.mcList[j].cy * this.ca + this.mcList[j].cz * (-this.sa);
var rz1 = this.mcList[j].cy * this.sa + this.mcList[j].cz * this.ca;
var rx2 = rx1 * this.cb + rz1 * this.sb;
var ry2 = ry1;
var rz2 = rx1 * (-this.sb) + rz1 * this.cb;
var rx3 = rx2 * this.cc + ry2 * (-this.sc);
var ry3 = rx2 * this.sc + ry2 * this.cc;
var rz3 = rz2;
this.mcList[j].cx = rx3;
this.mcList[j].cy = ry3;
this.mcList[j].cz = rz3;
var per = this.d / (this.d + rz3);
this.mcList[j].x = (this.howElliptical * rx3 * per) - (this.howElliptical * 2);
this.mcList[j].y = ry3 * per;
this.mcList[j].scale = per;
this.mcList[j].alpha = per;
this.mcList[j].alpha = (this.mcList[j].alpha - 0.6) * (10 / 6);
}
this.doPosition();
this.depthSort();
})
},
//
doPosition() {
this.$nextTick(() => { // 注意: 所有的在onReady方法中执行的方法都需要$nextTick确保所有的标签都已经渲染
var l = this.oList.offsetWidth / 2;
var t = this.oList.offsetHeight / 2;
for (var i = 0; i < this.mcList.length; i++) {
this.oA[i].style.left = this.mcList[i].cx + l - this.mcList[i].offsetWidth / 2 + "px";
this.oA[i].style.top = this.mcList[i].cy + t - this.mcList[i].offsetHeight / 2 + "px";
this.oA[i].style.fontSize = Math.ceil(12 * this.mcList[i].scale / 2) + 8 + "px";
// this.oA[i].style.filter = "alpha(opacity=" + 100 * this.mcList[i].alpha + ")";
this.oA[i].style.opacity = this.mcList[i].alpha;
}
})
},
//
depthSort() {
this.$nextTick(() => { // 注意: 所有的在onReady方法中执行的方法都需要$nextTick确保所有的标签都已经渲染
var aTmp = [];
for (let i = 0; i < this.oA.length; i++) {
aTmp.push(this.oA[i]);
}
aTmp.sort(function (vItem1, vItem2) {
if (vItem1.cz > vItem2.cz) {
return -1;
} else if (vItem1.cz < vItem2.cz) {
return 1;
} else {
return 0;
}
});
for (let i = 0; i < aTmp.length; i++) {
aTmp[i].style.zIndex = i;
}
})
},
// 网络请求 拿到tagList
query() {
// 假装从接口拿回来的数据
let tagListOrg = [
{ name: "标签1", url: "www.baidu.com" },
{ name: "标签2", url: "www.baidu.com" },
{ name: "标签3", url: "www.baidu.com" },
{ name: "标签4", url: "www.baidu.com" },
{ name: "标签5", url: "www.baidu.com" },
{ name: "标签6", url: "www.baidu.com" },
{ name: "标签7", url: "www.baidu.com" },
{ name: "标签8", url: "www.baidu.com" },
{ name: "标签9", url: "www.baidu.com" },
{ name: "标签10", url: "www.baidu.com" },
{ name: "标签11", url: "www.baidu.com" },
{ name: "标签12", url: "www.baidu.com" },
{ name: "标签13", url: "www.baidu.com" },
{ name: "标签14", url: "www.baidu.com" },
{ name: "标签15", url: "www.baidu.com" },
{ name: "标签16", url: "www.baidu.com" },
{ name: "标签16", url: "www.baidu.com" },
{ name: "标签16", url: "www.baidu.com" },
{ name: "标签16", url: "www.baidu.com" },
{ name: "标签16", url: "www.baidu.com" },
{ name: "标签16", url: "www.baidu.com" },
{ name: "标签16", url: "www.baidu.com" },
{ name: "标签16", url: "www.baidu.com" },
{ name: "标签16", url: "www.baidu.com" },
{ name: "标签16", url: "www.baidu.com" },
{ name: "标签16", url: "www.baidu.com" },
{ name: "标签16", url: "www.baidu.com" },
{ name: "标签16", url: "www.baidu.com" },
{ name: "标签16", url: "www.baidu.com" },
{ name: "标签17", url: "www.baidu.com" }
];
// 给tagList添加随机颜色
tagListOrg.forEach(item => {
item.color = "rgb(" + this.getRandomNum() + "," + this.getRandomNum() + "," + this.getRandomNum() + ")";
})
this.tagList = tagListOrg;
this.onReady();
},
// 生成标签云
onReady() {
this.$nextTick(() => {
this.oList = this.$refs.tagcloudall;
this.oA = this.oList.getElementsByTagName("a")
var oTag = null;
for (var i = 0; i < this.oA.length; i++) {
oTag = {};
oTag.offsetWidth = this.oA[i].offsetWidth;
oTag.offsetHeight = this.oA[i].offsetHeight;
this.mcList.push(oTag);
}
this.sineCosine(0, 0, 0);
this.positionAll();
this.oList.onmouseover = () => {
this.active = true;
}
this.oList.onmouseout = () => {
this.active = false;
}
this.oList.onmousemove = (event) => {
var oEvent = window.event || event;
this.mouseX = oEvent.clientX - (this.oList.offsetLeft + this.oList.offsetWidth / 2);
this.mouseY = oEvent.clientY - (this.oList.offsetTop + this.oList.offsetHeight / 2);
this.mouseX /= 5;
this.mouseY /= 5;
}
setInterval(() => {
this.update()
}, 30); // 定时器执行 不能写setInterval(this.update(), 30)
})
}
},
created() {
this.$nextTick(() => {
this.query();
})
}
}以上就是“Vue中如何实现3D标签云”这篇文章的所有内容，感谢各位的阅读！相信大家阅读完这篇文章都有很大的收获，小编每天都会为大家更新不同的知识，如果还想学习更多的知识，请关注编程网行业资讯频道。
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