词云的使用
<template>
<div>
<div class="j-word-cloud" :style="'min-height:' + height + 'px;width:' + width + 'px;'">
<span v-for="(item, index) in showTextList" :key="index" :id="'word-' + index"
:style="getStyle(item, index)">
{{ item.text }}
</span>
</div>
<div @click="init()">刷新</div>
</div>
</template>
<script>
export default {
name: "JWordCloud",
props: {
textList: {
type: Array,
default: () => {
return [
{ text: "单词", freq: 10 },
{ text: "单词1", freq: 5 },
{ text: "单词2", freq: 7 },
{ text: "单词3", freq: 2 },
{ text: "单词5", freq: 3 },
{ text: "单词6", freq: 4 },
{ text: "单词7", freq: 5 },
{ text: "单词8", freq: 6 },
{ text: "单词9", freq: 6 },
{ text: "单词10", freq: 8 },
{ text: "单词11", freq: 4 },
{ text: "单词12", freq: 2 },
{ text: "单词13", freq: 4 },
{ text: "单词14", freq: 3 },
{ text: "单词15", freq: 1 },
{ text: "单词16", freq: 5 }
];
}
},
width: {
type: Number,
default: 300
},
colorList: {
type: Array,
default: () => []
},
baseSize: {
type: Number,
default: 2
},
maxSize: {
type: Number,
default: 5
},
minSize: {
type: Number,
default: 1
},
transformDeg: {
type: Array,
default: () => {
return [-45, 45];
}
}
},
data() {
return {
maxFreq: 0,
minFreq: 0,
showTextList: [],
pointList: [],
height: 200
};
},
mounted() {
this.init();
},
methods: {
init() {
this.initData();
this.comShowtexList();
this.getFourPoints();
},
//组合样式
getStyle(item, index) {
const height = parseFloat(item.size) * 16;
const width = parseFloat(item.size) * 20 * item.text.length;
let res = "";
res += "font-size:" + item.size + ";";
// res += "position: absolute;";
res += "float: left;";
// res +=
// "top:" +
// Math.max(0, Math.min(item.point.y, this.width - width)) +
// "px;";
// res +=
// "left:" +
// Math.max(0, Math.min(item.point.x, this.height - height)) +
// "px;";
res += "color:" + item.color + ";";
// res += "transform:rotate(" + item.deg + "deg);";
return res;
},
//计算旋转后的坐标
getTransformPoint(x, y, deg) {
deg = parseFloat(deg);
let rx = (Math.cos(deg * Math.PI) / 180) * x,
ry = (Math.sin(deg * Math.PI) / 180) * x;
return { tx: x + rx, ty: y + ry };
},
//随机获取坐标
getRandomPoint() {
const width = this.width,
height = this.height,
pointList = this.pointList,
showTextList = this.showTextList;
const x = this.getRandomNum(0, width - 20),
y = this.getRandomNum(0, height - 20);
return { x: x, y: y };
},
//随机获取颜色
getRandomColor() {
let res = "rgb(";
res += this.getRandomNum(0, 255) + ",";
res += this.getRandomNum(0, 255) + ",";
res += this.getRandomNum(0, 255) + ")";
return res;
},
//随机获取角度
getRandomdeg() {
let res = "";
res += this.getRandomNum(
this.transformDeg[0],
this.transformDeg[1]
);
return res;
},
//获取随机数
getRandomNum(minN, maxN) {
return Math.floor(Math.random() * (maxN - minN + 1) + minN);
},
//初始化
initData() {
const textList = this.textList;
let maxF = textList[0].freq,
minF = textList[0].freq;
textList.map(item => {
maxF = Math.max(maxF, item.freq);
minF = Math.min(minF, item.freq);
});
this.maxFreq = maxF;
this.minFreq = minF;
},
//通过词频计算字体大小
getSize(freq) {
const baseSize = (this.maxSize + this.minSize) / 2;
const addSize =
((this.maxSize - this.minSize) * (freq - this.minFreq)) /
(this.maxFreq - this.minFreq);
return (
((this.minSize + addSize) / baseSize) * this.baseSize + "rem"
);
},
//获取四个顶点坐标
getFourPoints() {
this.$nextTick(() => {
let showTextList = this.showTextList;
let newHeight = 0;
for (let i = 0; i < showTextList.length; i++) {
let id = "word-" + i;
let dom = document.getElementById(id);
let tl = { x: dom.offsetLeft, y: dom.offsetTop };
let tr = {
x: dom.offsetLeft + dom.offsetWidth,
y: dom.offsetTop
};
let bl = {
x: dom.offsetLeft,
y: dom.offsetTop + dom.offsetHeight
};
let br = {
x: dom.offsetLeft + dom.offsetWidth,
y: dom.offsetTop
};
newHeight = Math.max(newHeight, bl.y);
showTextList[i].fourPoints = {
tl: tl,
tr: tr,
bl: bl,
br: br
};
}
this.height = newHeight;
});
},
//组装显示列表属性数据
comShowtexList() {
let showTextList = [];
this.textList.map(item => {
let temp = item;
temp.size = this.getSize(item.freq);
const point = this.getRandomPoint();
const color = this.getRandomColor();
const deg = this.getRandomdeg();
this.pointList.push(point);
temp.point = point;
temp.color = color;
temp.deg = deg;
showTextList.push(temp);
});
showTextList = showTextList.sort((a, b) => {
return 0.5 - Math.random();
});
this.showTextList = showTextList;
}
}
};
</script>
<style lang="scss" scoped>
.j-word-cloud {
border: 1px solid black;
position: relative;
span {
transform-origin: 0 0;
padding: 0.1rem;
margin: 0 auto;
}
}
</style>
