208 lines
7.2 KiB
JavaScript
208 lines
7.2 KiB
JavaScript
"use strict";
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const common_vendor = require("./common/vendor.js");
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const _sfc_main = {
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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"]
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// 外圈、中间、中心
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},
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// 新增：字号配置，让组件更灵活
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fontSizeConfig: {
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type: Object,
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default: () => ({
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minSize: 12,
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// 最小字号
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maxSize: 40,
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// 最大字号
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scaleFactor: 0.1
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// 缩放因子，越大字号差异越明显
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})
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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,
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// canvas 2d 上下文
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placedWords: []
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// 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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await new Promise((resolve) => setTimeout(resolve, 50));
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const query = common_vendor.index.createSelectorQuery().in(this);
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query.select(".word-cloud-canvas").fields({ node: true, size: true }).exec(async (res) => {
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if (!res || !res[0] || !res[0].node) {
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common_vendor.index.__f__("error", "at components/WordCloud/WordCloud.vue:82", "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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try {
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ctx = canvas.getContext("2d");
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} catch (e) {
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common_vendor.index.__f__("warn", "at components/WordCloud/WordCloud.vue:93", "获取2d上下文失败，尝试兼容处理", e);
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ctx = common_vendor.index.createCanvasContext("wordCloudCanvas", this);
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}
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if (!ctx) {
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common_vendor.index.__f__("error", "at components/WordCloud/WordCloud.vue:99", "无法获取canvas 2d上下文");
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return;
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}
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const dpr = common_vendor.index.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)
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return;
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this.ctx.clearRect(0, 0, this.canvasWidth, this.canvasHeight);
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this.placedWords = [];
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const sortedWords = [...this.wordData].sort((a, b) => b.value - a.value);
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const values = sortedWords.map((item) => item.value);
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this.valueMax = Math.max(...values);
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this.valueMin = Math.min(...values);
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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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const maxAttempts = 150;
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const { minSize, maxSize, scaleFactor } = this.fontSizeConfig;
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let normalizedValue = 1;
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if (this.valueMax !== this.valueMin) {
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normalizedValue = (word.value - this.valueMin) / (this.valueMax - this.valueMin);
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}
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const fontSize = Math.min(
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minSize + (maxSize - minSize) * normalizedValue * scaleFactor,
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maxSize
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);
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const rotateAngle = (Math.random() - 0.5) * 120 * Math.PI / 180;
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ctx.font = `${fontSize}px sans-serif`;
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const textWidth = ctx.measureText(word.text || word.name).width;
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const textHeight = fontSize * 1.05;
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for (let i = 0; i < maxAttempts; i++) {
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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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const isOverlap = this.checkOverlap(x, y, textWidth, textHeight, rotateAngle, 2);
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if (!isOverlap) {
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const centerX = this.canvasWidth / 2;
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const centerY = this.canvasHeight / 2;
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const distance = Math.sqrt(Math.pow(x - centerX, 2) + Math.pow(y - centerY, 2));
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const maxDistance = Math.sqrt(Math.pow(centerX, 2) + Math.pow(centerY, 2));
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let color;
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if (distance > maxDistance * 0.66) {
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color = this.colorList[0];
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} else if (distance > maxDistance * 0.33) {
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color = this.colorList[1];
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} else {
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color = this.colorList[2];
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}
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ctx.fillStyle = color;
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this.drawTextAtPosition(word.text || word.name, x, y, rotateAngle, fontSize);
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this.placedWords.push({
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x,
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y,
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width: textWidth,
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height: textHeight,
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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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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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if (currentRect.left < placedRect.right && currentRect.right > placedRect.left && currentRect.top < placedRect.bottom && currentRect.bottom > placedRect.top) {
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return true;
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}
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}
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return false;
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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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const cos = Math.cos(angle);
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const sin = Math.sin(angle);
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const halfW = (width - gap) / 2;
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const halfH = (height - gap) / 2;
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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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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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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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ctx.save();
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ctx.translate(x, y);
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ctx.rotate(angle);
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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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ctx.restore();
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}
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}
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};
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function _sfc_render(_ctx, _cache, $props, $setup, $data, $options) {
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return {
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a: $data.canvasWidth + "px",
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b: $data.canvasHeight + "px"
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};
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}
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const MiniProgramPage = /* @__PURE__ */ common_vendor._export_sfc(_sfc_main, [["render", _sfc_render], ["__scopeId", "data-v-cab45d13"]]);
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exports.MiniProgramPage = MiniProgramPage;
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//# sourceMappingURL=../.sourcemap/mp-weixin/WordCloud.js.map
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