个股中心
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@@ -78,6 +78,8 @@
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currentMonth)) + '-' + (currentDay > 9 ? currentDay : ('0' + currentDay))
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// this.getYesterdayDateData()
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this.generateMonthDateListData()
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// 初始化时就派发一次当前日期事件
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this.$emit('date-change', this.selectDateStr)
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},
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methods: {
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/**
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@@ -92,6 +94,8 @@
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let selectDay = selectDate.getDate();
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this.selectDateStr = selectYear + '-' + (selectMonth > 9 ? selectMonth : ('0' + selectMonth)) + '-' + (
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selectDay > 9 ? selectDay : ('0' + selectDay))
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// 派发日期变更事件
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this.$emit('date-change', this.selectDateStr)
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},
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/**
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* 生成日期数组
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@@ -279,6 +283,7 @@
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this.selectDateStr = item.date
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this.chgStockData = item
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console.log('点击某天');
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this.$emit('date-change', this.selectDateStr)
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}
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}
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}
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294
components/WordCloud/WordCloud.vue
Normal file
294
components/WordCloud/WordCloud.vue
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@@ -0,0 +1,294 @@
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<template>
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<view class="word-cloud-container">
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<!-- canvas组件,适配小程序 -->
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<canvas
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type="2d"
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ref="wordCloudCanvas"
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id="wordCloudCanvas"
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class="word-cloud-canvas"
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:style="{width: canvasWidth + 'px', height: canvasHeight + 'px'}"
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></canvas>
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</view>
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</template>
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<script>
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export default {
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name: "WordCloud",
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props: {
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// 词云数据 [{text: '关键词', value: 100}, ...]
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wordData: {
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type: Array,
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required: true,
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default: () => []
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},
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// 画布宽度
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width: {
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type: Number,
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default: 300
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},
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// 画布高度
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height: {
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type: Number,
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default: 300
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},
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// 文字颜色列表(分层配色)
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colorList: {
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type: Array,
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default: () => ['#60A5FA', '#FEC200', '#EF4444'] // 外圈、中间、中心
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}
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},
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data() {
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return {
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canvasWidth: this.width,
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canvasHeight: this.height,
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ctx: null, // canvas 2d 上下文
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placedWords: [] // 已放置的文字信息(用于碰撞检测)
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};
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},
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watch: {
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wordData: {
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handler() {
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this.drawWordCloud();
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},
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deep: true
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}
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},
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mounted() {
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this.initCanvas();
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},
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methods: {
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// 初始化canvas
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async initCanvas() {
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// 修复点1:增加延迟,确保canvas节点渲染完成(兼容小程序渲染时机)
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await new Promise(resolve => setTimeout(resolve, 50));
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// 适配小程序获取canvas上下文
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const query = uni.createSelectorQuery().in(this);
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// 修复点2:使用ref选择器(.ref-wordCloudCanvas)替代ID选择器,或给canvas加id
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query.select('.word-cloud-canvas') // 改用class选择器,与模板中canvas的class对应
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.fields({ node: true, size: true })
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.exec(async (res) => {
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// 修复点3:增加空值判断,避免res[0]为null时报错
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if (!res || !res[0] || !res[0].node) {
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console.error('获取canvas节点失败,请检查canvas是否正确渲染');
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return;
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}
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const canvas = res[0].node;
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let ctx = null;
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// 修复点4:兼容不同小程序平台的canvas 2d上下文获取
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try {
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ctx = canvas.getContext('2d');
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} catch (e) {
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console.warn('获取2d上下文失败,尝试兼容处理', e);
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// 部分小程序平台需要先初始化canvas 2d
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ctx = uni.createCanvasContext('wordCloudCanvas', this);
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}
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if (!ctx) {
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console.error('无法获取canvas 2d上下文');
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return;
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}
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// 设置canvas尺寸
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const dpr = uni.getSystemInfoSync().pixelRatio || 1;
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canvas.width = this.canvasWidth * dpr;
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canvas.height = this.canvasHeight * dpr;
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ctx.scale(dpr, dpr);
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this.ctx = ctx;
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this.drawWordCloud();
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});
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},
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// 绘制词云核心方法
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drawWordCloud() {
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if (!this.ctx || !this.wordData.length) return;
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// 清空画布和已放置文字记录
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this.ctx.clearRect(0, 0, this.canvasWidth, this.canvasHeight);
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this.placedWords = [];
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// 按权重排序(权重越大,文字越大)
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const sortedWords = [...this.wordData].sort((a, b) => b.value - a.value);
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// 逐个绘制文字
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sortedWords.forEach((word, index) => {
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this.placeWord(word, index);
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});
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},
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// 放置单个文字(核心:碰撞检测,确保不重叠)
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placeWord(word, index) {
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const ctx = this.ctx;
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// 优化1:提高最大尝试次数(从50→150),让更多文字能找到位置
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const maxAttempts = 150;
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const baseFontSize = 12; // 基础字体大小
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// 分段计算分母(适配不同value区间)
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const value = word.value;
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const baseDenominator = 1000; // 基础分母
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const interval = 500; // 区间步长
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const step = 500; // 分母每次增加的步长
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// 计算当前value所属区间,动态确定分母
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const intervalNum = Math.floor(value / interval);
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let denominator = baseDenominator + (intervalNum * step);
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// 兜底:避免分母过小(比如value为0时)
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denominator = Math.max(denominator, baseDenominator);
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// 根据分段分母计算字体大小,限制最大值
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const maxFontSize = 28; // 优化2:适当减小最大字体(从32→28),节省空间
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const fontSize = Math.min(baseFontSize + (value / denominator) * 16, maxFontSize);
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// 旋转角度:-60° 到 60°
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const rotateAngle = (Math.random() - 0.5) * 120 * Math.PI / 180;
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// 设置字体样式
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ctx.font = `${fontSize}px sans-serif`;
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// 获取文字宽度和高度(用于碰撞检测)
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const textWidth = ctx.measureText(word.name).width;
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// 优化3:更精准的文字高度估算(从1.2→1.05),减少无效空间
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const textHeight = fontSize * 1.05;
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// 尝试放置文字,直到找到不重叠的位置
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for (let i = 0; i < maxAttempts; i++) {
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// 优化4:扩大随机位置范围(从0.2-0.8→0.05-0.95),利用边缘空间
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const x = this.canvasWidth * 0.05 + Math.random() * this.canvasWidth * 0.9;
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const y = this.canvasHeight * 0.05 + Math.random() * this.canvasHeight * 0.9;
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// 碰撞检测:检查当前位置是否与已放置的文字重叠(传入间距容差)
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const isOverlap = this.checkOverlap(x, y, textWidth, textHeight, rotateAngle, 2); // 间距容差2px
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if (!isOverlap) {
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// ===== 核心修改:按位置分层设置颜色 =====
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// 1. 计算画布中心坐标
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const centerX = this.canvasWidth / 2;
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const centerY = this.canvasHeight / 2;
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// 2. 计算当前文字位置到中心的距离(欧几里得距离)
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const distance = Math.sqrt(Math.pow(x - centerX, 2) + Math.pow(y - centerY, 2));
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// 3. 计算画布最大半径(中心到角落的距离)
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const maxDistance = Math.sqrt(Math.pow(centerX, 2) + Math.pow(centerY, 2));
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// 4. 按距离分三层分配颜色
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let color;
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if (distance > maxDistance * 0.66) {
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// 外圈(距离>2/3最大半径):#60A5FA
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color = this.colorList[0];
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} else if (distance > maxDistance * 0.33) {
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// 中间层(距离>1/3最大半径):#FEC200
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color = this.colorList[1];
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} else {
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// 中心层(距离≤1/3最大半径):#EF4444
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color = this.colorList[2];
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}
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// =========================================
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// 设置文字颜色
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ctx.fillStyle = color;
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// 无重叠,绘制文字
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this.drawTextAtPosition(word.name, x, y, rotateAngle, fontSize);
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// 记录已放置的文字信息(用于后续碰撞检测)
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this.placedWords.push({
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x, y, width: textWidth, height: textHeight, angle: rotateAngle
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});
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break;
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}
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}
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},
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// 碰撞检测:检查当前文字是否与已放置的文字重叠(新增间距容差参数)
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checkOverlap(x, y, width, height, angle, gap = 2) {
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// 简化碰撞检测:使用包围盒检测(旋转后的矩形包围盒)
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const currentRect = this.getBoundingRect(x, y, width, height, angle, gap);
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for (const placed of this.placedWords) {
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const placedRect = this.getBoundingRect(placed.x, placed.y, placed.width, placed.height, placed.angle, gap);
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// 轴对齐包围盒(AABB)碰撞检测
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if (
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currentRect.left < placedRect.right &&
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currentRect.right > placedRect.left &&
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currentRect.top < placedRect.bottom &&
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currentRect.bottom > placedRect.top
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) {
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return true; // 重叠
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}
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}
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return false; // 不重叠
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},
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// 获取旋转后文字的包围盒(新增间距容差参数,缩小包围盒)
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getBoundingRect(x, y, width, height, angle, gap = 2) {
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// 计算旋转后的四个顶点
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const cos = Math.cos(angle);
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const sin = Math.sin(angle);
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// 优化5:缩小包围盒(减去间距容差),让文字间距更小
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const halfW = (width - gap) / 2;
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const halfH = (height - gap) / 2;
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// 四个顶点坐标(相对于中心)
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const points = [
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{ x: -halfW, y: -halfH },
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{ x: halfW, y: -halfH },
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{ x: halfW, y: halfH },
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{ x: -halfW, y: halfH }
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];
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// 旋转并平移到实际位置
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const rotatedPoints = points.map(point => ({
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x: x + point.x * cos - point.y * sin,
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y: y + point.x * sin + point.y * cos
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}));
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// 计算包围盒的最小/最大坐标
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const left = Math.min(...rotatedPoints.map(p => p.x));
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const right = Math.max(...rotatedPoints.map(p => p.x));
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const top = Math.min(...rotatedPoints.map(p => p.y));
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const bottom = Math.max(...rotatedPoints.map(p => p.y));
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return { left, right, top, bottom };
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},
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// 在指定位置绘制旋转后的文字
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drawTextAtPosition(text, x, y, angle, fontSize) {
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const ctx = this.ctx;
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// 保存当前画布状态
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ctx.save();
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// 平移到文字中心位置
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ctx.translate(x, y);
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// 旋转
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ctx.rotate(angle);
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// 绘制文字(居中对齐)
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ctx.textAlign = 'center';
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ctx.textBaseline = 'middle';
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ctx.fillText(text, 0, 0);
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// 恢复画布状态
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ctx.restore();
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}
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}
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};
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</script>
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<style scoped>
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.word-cloud-container {
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width: 100%;
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height: 100%;
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}
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.word-cloud-canvas {
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width: 100%;
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height: 100%;
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}
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</style>
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