From d4ce91efd17eaff6634ca0d4e5d5492380cd1d58 Mon Sep 17 00:00:00 2001 From: hz4th_coder Date: Thu, 16 Jul 2026 11:33:39 +0800 Subject: [PATCH] =?UTF-8?q?feat:=20=E6=B7=BB=E5=8A=A0=20API=20=E6=8E=A5?= =?UTF-8?q?=E5=8F=A3=E6=94=AF=E6=8C=81=E6=9C=8D=E5=8A=A1=E7=AB=AF=E7=94=9F?= =?UTF-8?q?=E6=88=90=E5=9B=BE=E8=A1=A8=E5=9B=BE=E7=89=87?= MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit - 新增 Node.js + Express 后端服务 (server.js) - POST /api/chart: JSON 请求体生成图表 PNG - GET /api/chart: URL 参数生成图表 PNG - 支持所有前端配置参数(图表类型/主题/标签/堆叠/分割等) - 使用 @napi-rs/canvas + echarts 服务端渲染 - 自定义分辨率和像素倍率 - 添加 /api/health 和 /api/docs 接口 - 更新 README 文档，添加 API 使用说明 --- .gitignore | 4 + README.md | 176 +++++-- package-lock.json | 1146 +++++++++++++++++++++++++++++++++++++++++++++ package.json | 16 + server.js | 482 +++++++++++++++++++ 5 files changed, 1773 insertions(+), 51 deletions(-) create mode 100644 .gitignore create mode 100644 package-lock.json create mode 100644 package.json create mode 100644 server.js diff --git a/.gitignore b/.gitignore new file mode 100644 index 0000000..4e5ea97 --- /dev/null +++ b/.gitignore @@ -0,0 +1,4 @@ +node_modules/ +logs/ +*.png +*.svg diff --git a/README.md b/README.md index 7fed702..33ef6d4 100644 --- a/README.md +++ b/README.md @@ -1,9 +1,9 @@ # 📊 数据可视化图表生成器 -一个简洁强大的在线数据可视化工具，粘贴数据即可生成精美的对比图表。 +一个简洁强大的数据可视化工具，支持 **Web UI** 和 **API** 两种方式生成精美的对比图表图片。 ![License](https://img.shields.io/badge/license-MIT-blue.svg) -![Version](https://img.shields.io/badge/version-1.0.0-green.svg) +![Version](https://img.shields.io/badge/version-1.1.0-green.svg) ## ✨ 功能特性 @@ -15,7 +15,7 @@ ### 🎨 自定义配置 - **主题风格** - 5种预设主题（默认/深色/马卡龙/渐变/复古） - **颜色自定义** - 每个系列可单独设置颜色 -- **顺序调整** - 拖拽即可调整系列显示顺序 +- **顺序调整** - 拖拽即可调整系列显示顺序（Web UI） - **显示选项** - 图例、网格线、数据标签、堆叠模式等 ### 📐 区域分割 @@ -23,37 +23,132 @@ - 可自定义分割线样式（实线/虚线/点线） - 自动标注左右区域标签 +### 📡 API 接口 +- **POST /api/chart** - JSON 请求体生成图表（完整参数支持） +- **GET /api/chart** - URL 参数生成图表（简单场景） +- 返回 PNG 图片，支持自定义分辨率和像素倍率 + ### 📥 导出功能 -- 导出为 PNG（2倍分辨率） -- 导出为 SVG（矢量格式） +- Web UI 导出 PNG（2倍分辨率） +- API 直接返回 PNG 图片流 ## 🚀 快速开始 -### 本地运行 +### 启动服务 ```bash -# 克隆仓库 -git clone http://121.40.164.32:12007/hz4th_coder/data-chart-tool.git - -# 进入目录 cd data-chart-tool - -# 启动本地服务器（任选其一） -python3 -m http.server 8080 +npm install +npm start # 或 -npx serve +node server.js ``` -浏览器访问 `http://localhost:8080` 即可使用。 +服务默认运行在 `16023` 端口，可通过环境变量修改： -### 在线使用 +```bash +PORT=8080 node server.js +``` -已部署在内部服务器：http://192.168.0.101:16023 +### Web UI + +浏览器访问 `http://localhost:16023` 即可使用可视化界面。 + +### API 调用 + +#### POST 方式（推荐） + +```bash +curl -X POST http://localhost:16023/api/chart \ + -H "Content-Type: application/json" \ + -d '{ + "data": "产品, Q1, Q2, Q3, Q4\n手机, 1200, 1800, 2100, 2500\n平板, 800, 950, 1100, 1300", + "chartType": "bar", + "title": "季度销售对比", + "theme": "default", + "width": 800, + "height": 500 + }' -o chart.png +``` + +#### GET 方式 + +```bash +curl "http://localhost:16023/api/chart?data=产品,Q1,Q2\n手机,100,200\n平板,150,250&type=bar&title=测试" -o chart.png +``` + +#### Python 调用示例 + +```python +import requests + +resp = requests.post('http://localhost:16023/api/chart', json={ + "data": "月份, 营收, 利润\n1月, 500, 80\n2月, 680, 120\n3月, 820, 160", + "chartType": "line", + "title": "增长趋势", + "theme": "dark", + "showLabel": True, + "width": 900, + "height": 500 +}) + +with open('chart.png', 'wb') as f: + f.write(resp.content) +``` + +## 📡 API 文档 + +### POST /api/chart + +通过 JSON 请求体生成图表图片。 + +**请求参数：** + +| 参数 | 类型 | 必填 | 默认值 | 说明 | +|------|------|------|--------|------| +| data | string | ✅ | - | CSV 格式数据（`\n` 换行，第一行表头，第一列横坐标） | +| chartType | string | - | bar | 图表类型：`bar` / `line` / `bar-line` | +| title | string | - | "" | 图表标题 | +| theme | string | - | default | 主题：`default` / `dark` / `macarons` / `gradient` / `retro` | +| showLegend | boolean | - | true | 是否显示图例 | +| showGrid | boolean | - | true | 是否显示网格线 | +| showLabel | boolean | - | false | 是否显示数据标签 | +| stackMode | boolean | - | false | 是否堆叠模式 | +| smoothLine | boolean | - | true | 折线图是否平滑 | +| enableSplit | boolean | - | false | 是否启用区域分割 | +| splitIndex | number | - | 3 | 分割位置索引 | +| leftLabel | string | - | "左侧" | 左侧区域标签 | +| rightLabel | string | - | "右侧" | 右侧区域标签 | +| splitStyle | string | - | "solid" | 分割线样式：`solid` / `dashed` / `dotted` | +| width | number | - | 800 | 图片宽度(px) | +| height | number | - | 500 | 图片高度(px) | +| pixelRatio | number | - | 2 | 像素倍率（清晰度） | + +**返回：** `image/png` 二进制流 + +### GET /api/chart + +通过 URL 参数生成图表（适合简单场景）。 + +| 参数 | 说明 | +|------|------| +| data | CSV 数据（换行用 `\n` 表示） | +| type | 图表类型 | +| title | 图表标题 | +| theme | 主题风格 | +| width | 图片宽度 | +| height | 图片高度 | + +### GET /api/health + +健康检查，返回服务状态。 + +### GET /api/docs + +返回 API 文档（JSON 格式）。 ## 📝 数据格式 -### 基本格式 - 第一行为**表头**（系列名称），第一列为**横坐标值**，支持逗号、制表符分隔： ``` @@ -63,55 +158,34 @@ B, 15, 25, 35 C, 20, 30, 40 ``` -### 示例数据 - -**季度销售对比：** -``` -产品, Q1, Q2, Q3, Q4 -手机, 1200, 1800, 2100, 2500 -平板, 800, 950, 1100, 1300 -笔记本, 600, 750, 900, 1050 -``` - -**年度增长趋势：** -``` -指标, 2020年, 2021年, 2022年, 2023年, 2024年 -营收(万), 500, 680, 820, 1050, 1380 -利润(万), 80, 120, 160, 230, 350 -用户(千), 50, 85, 130, 200, 320 -``` - -## 🎯 使用场景 - -| 场景 | 说明 | -|------|------| -| 销售数据分析 | 对比不同产品、不同季度的销售表现 | -| 年度趋势展示 | 展示多年份的指标变化趋势 | -| 方案对比评估 | 使用区域分割功能对比两个方案 | -| 团队绩效展示 | 多团队、多指标的综合对比 | - ## 🛠️ 技术栈 - **ECharts 5.5.0** - 图表渲染引擎 -- **原生 HTML/CSS/JS** - 无框架依赖，轻量快速 +- **@napi-rs/canvas** - Node.js 服务端 Canvas 渲染 +- **Express** - Web 服务框架 +- **原生 HTML/CSS/JS** - 前端无框架依赖 ## 📁 项目结构 ``` data-chart-tool/ -├── index.html # 主页面 -├── style.css # 样式文件 -├── app.js # 核心逻辑 -└── README.md # 项目说明 +├── server.js # Node.js 后端（API 服务） +├── app.js # 前端核心逻辑 +├── index.html # Web UI 主页面 +├── style.css # 样式文件 +├── package.json # 依赖管理 +└── README.md # 项目说明 ``` ## 🔧 开发计划 +- [x] 支持 API 生成图表图片 - [ ] 支持饼图、雷达图等更多图表类型 - [ ] 支持从 Excel/CSV 文件导入 - [ ] 支持数据编辑和实时预览 - [ ] 添加更多主题风格 - [ ] 支持图表模板保存和分享 +- [ ] 支持 SVG 格式服务端导出 ## 📄 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PORT = process.env.PORT || 16023; + +// 中间件 +app.use(cors()); +app.use(express.json({ limit: '10mb' })); +app.use(express.urlencoded({ extended: true, limit: '10mb' })); + +// 静态文件（前端页面） +app.use(express.static(path.join(__dirname))); + +// ===== 预设颜色方案 ===== +const colorPalettes = { + default: ['#5470c6', '#91cc75', '#fac858', '#ee6666', '#73c0de', '#3ba272', '#fc8452', '#9a60b4', '#ea7ccc'], + dark: ['#4fc3f7', '#81c784', '#fff176', '#ff8a65', '#ba68c8', '#4dd0e1', '#ffab91', '#aed581', '#f48fb1'], + macarons: ['#2ec7c9', '#b6a2de', '#5ab1ef', '#ffb980', '#d87a80', '#8d98b3', '#e5cf0d', '#97b552', '#95706d'], + gradient: ['#7f7fd5', '#86a8e7', '#91eae4', '#ff6b6b', '#feca57', '#48dbfb', '#ff9ff3', '#54a0ff', '#5f27cd'], + retro: ['#d4a5a5', '#95b9c7', '#f6e8c3', '#dfceb4', '#a4c3b5', '#c9b1ff', '#f5c7b8', '#b8d4e3', '#e8c8a0'] +}; + +// ===== 数据解析（与前端一致） ===== +function parseData(rawText) { + const lines = rawText.trim().split('\n').filter(l => l.trim()); + if (lines.length < 2) { + throw new Error('数据至少需要包含表头和一行数据'); + } + + // 自动检测分隔符 + let delimiter = ','; + if (lines[0].includes('\t')) { + delimiter = '\t'; + } else if (lines[0].split('|').length > lines[0].split(',').length) { + delimiter = '|'; + } + + const rows = lines.map(line => { + return line.split(delimiter).map(cell => cell.trim()); + }); + + const headers = rows[0]; + const categories = []; + const seriesData = {}; + + for (let i = 1; i < headers.length; i++) { + seriesData[headers[i]] = []; + } + + for (let i = 1; i < rows.length; i++) { + categories.push(rows[i][0]); + for (let j = 1; j < rows[i].length && j < headers.length; j++) { + const val = parseFloat(rows[i][j]); + seriesData[headers[j]].push(isNaN(val) ? 0 : val); + } + } + + return { + categories, + seriesNames: headers.slice(1), + seriesData + }; +} + +// ===== 颜色工具 ===== +function adjustColor(hex, amount) { + hex = hex.replace('#', ''); + const num = parseInt(hex, 16); + let r = Math.min(255, ((num >> 16) & 0xff) + amount); + let g = Math.min(255, ((num >> 8) & 0xff) + amount); + let b = Math.min(255, (num & 0xff) + amount); + return `rgb(${r},${g},${b})`; +} + +// ===== 构建 ECharts option ===== +function buildChartOption(params) { + const { + data, + chartType = 'bar', + title = '', + theme = 'default', + showLegend = true, + showGrid = true, + showLabel = false, + stackMode = false, + smoothLine = true, + enableSplit = false, + splitIndex = 3, + leftLabel = '左侧', + rightLabel = '右侧', + splitStyle = 'solid', + seriesColors: customColors = null + } = params; + + const parsedData = parseData(data); + const palette = colorPalettes[theme] || colorPalettes.default; + const seriesColorsArr = customColors || parsedData.seriesNames.map((_, i) => palette[i % palette.length]); + + // 背景色和文字色 + const bgColor = theme === 'dark' ? '#1a1a2e' : '#ffffff'; + const textColor = theme === 'dark' ? '#e0e0e0' : '#333333'; + const axisLineColor = theme === 'dark' ? '#444' : '#ddd'; + + // 构建系列 + const series = parsedData.seriesNames.map((name, idx) => { + const dataArr = parsedData.seriesData[name]; + const color = seriesColorsArr[idx] || palette[idx % palette.length]; + + let type = chartType === 'bar-line' + ? (idx % 2 === 0 ? 'bar' : 'line') + : chartType; + + const seriesItem = { + name: name, + type: type, + data: [...dataArr], + itemStyle: { color: color }, + emphasis: { + focus: 'series', + itemStyle: { + shadowBlur: 10, + shadowColor: 'rgba(0,0,0,0.3)' + } + } + }; + + if (stackMode) { + seriesItem.stack = 'total'; + } + + if (type === 'line') { + seriesItem.smooth = smoothLine; + seriesItem.lineStyle = { width: 3 }; + seriesItem.symbolSize = 8; + seriesItem.areaStyle = theme === 'gradient' ? { opacity: 0.15 } : undefined; + } + + if (type === 'bar') { + seriesItem.barMaxWidth = 40; + seriesItem.itemStyle.borderRadius = stackMode ? [0, 0, 0, 0] : [4, 4, 0, 0]; + } + + if (showLabel) { + seriesItem.label = { + show: true, + position: 'top', + fontSize: 11, + color: textColor, + formatter: (p) => { + if (p.value >= 10000) return (p.value / 10000).toFixed(1) + 'w'; + if (p.value >= 1000) return (p.value / 1000).toFixed(1) + 'k'; + return p.value; + } + }; + } + + return seriesItem; + }); + + // 区域分割 + if (enableSplit && splitIndex < parsedData.categories.length && series.length > 0) { + const splitLineColor = theme === 'dark' ? '#ff6b6b' : '#e74c3c'; + series[0].markArea = { + silent: true, + data: [ + [ + { + name: leftLabel, + xAxis: parsedData.categories[0], + itemStyle: { + color: theme === 'dark' ? 'rgba(79,195,247,0.06)' : 'rgba(79,70,229,0.05)', + borderWidth: 0 + }, + label: { + show: true, + position: 'insideTop', + fontSize: 13, + fontWeight: 'bold', + color: theme === 'dark' ? '#4fc3f7' : '#4f46e5', + offset: [0, 10] + } + }, + { xAxis: parsedData.categories[splitIndex - 1] } + ], + [ + { + name: rightLabel, + xAxis: parsedData.categories[splitIndex], + itemStyle: { + color: theme === 'dark' ? 'rgba(255,107,107,0.06)' : 'rgba(239,68,68,0.05)', + borderWidth: 0 + }, + label: { + show: true, + position: 'insideTop', + fontSize: 13, + fontWeight: 'bold', + color: theme === 'dark' ? '#ff6b6b' : '#ef4444', + offset: [0, 10] + } + }, + { xAxis: parsedData.categories[parsedData.categories.length - 1] } + ] + ] + }; + } + + // 完整 option + const option = { + backgroundColor: bgColor, + title: title ? { + text: title, + left: 'center', + top: 15, + textStyle: { + color: textColor, + fontSize: 18, + fontWeight: 600 + } + } : undefined, + tooltip: { show: false }, + legend: showLegend ? { + show: true, + top: title ? 50 : 15, + textStyle: { color: textColor, fontSize: 12 }, + itemGap: 20, + icon: 'roundRect' + } : { show: false }, + grid: { + left: '3%', + right: '4%', + bottom: '3%', + top: showLegend ? (title ? 90 : 60) : (title ? 60 : 30), + containLabel: true + }, + xAxis: { + type: 'category', + data: parsedData.categories, + axisLine: { lineStyle: { color: axisLineColor } }, + axisLabel: { + color: textColor, + fontSize: 12, + interval: 0, + rotate: parsedData.categories.length > 10 ? 30 : 0 + }, + axisTick: { show: false } + }, + yAxis: { + type: 'value', + axisLine: { show: false }, + axisTick: { show: false }, + axisLabel: { color: textColor, fontSize: 11 }, + splitLine: { + show: showGrid, + lineStyle: { + color: theme === 'dark' ? '#333' : '#f0f0f0', + type: 'dashed' + } + } + }, + series: series, + animation: false // 服务端渲染关闭动画 + }; + + return option; +} + +// ===== API: 生成图表图片 ===== +app.post('/api/chart', (req, res) => { + try { + const params = req.body; + + if (!params.data) { + return res.status(400).json({ error: '缺少 data 参数（CSV 格式数据）' }); + } + + const width = parseInt(params.width) || 800; + const height = parseInt(params.height) || 500; + const format = params.format || 'png'; + const pixelRatio = parseInt(params.pixelRatio) || 2; + + // 构建图表配置 + const option = buildChartOption(params); + + // 创建 canvas 并渲染 + const canvas = createCanvas(width * pixelRatio, height * pixelRatio); + const chart = echarts.init(canvas, null, { + renderer: 'canvas', + width: width, + height: height, + devicePixelRatio: pixelRatio + }); + + chart.setOption(option); + + // 输出图片 + if (format === 'svg') { + // SVG 需要用 SVG 渲染器重新渲染 + // node-canvas 不支持 SVG，返回 PNG 并提示 + const buffer = canvas.toBuffer('image/png'); + res.set({ + 'Content-Type': 'image/png', + 'Content-Length': buffer.length, + 'X-Chart-Format': 'png', + 'X-Chart-Note': 'SVG format not supported in server-side rendering, returned PNG instead' + }); + res.send(buffer); + } else { + const buffer = canvas.toBuffer('image/png'); + res.set({ + 'Content-Type': 'image/png', + 'Content-Length': buffer.length, + 'X-Chart-Width': width, + 'X-Chart-Height': height, + 'X-Chart-Pixel-Ratio': pixelRatio + }); + res.send(buffer); + } + + chart.dispose(); + } catch (err) { + console.error('Chart generation error:', err); + res.status(500).json({ error: '图表生成失败: ' + err.message }); + } +}); + +// ===== API: 生成图表（GET 方式，方便 URL 直接调用） ===== +app.get('/api/chart', (req, res) => { + try { + const params = { + data: req.query.data, + chartType: req.query.chartType || req.query.type || 'bar', + title: req.query.title || '', + theme: req.query.theme || 'default', + showLegend: req.query.showLegend !== 'false', + showGrid: req.query.showGrid !== 'false', + showLabel: req.query.showLabel === 'true', + stackMode: req.query.stackMode === 'true', + smoothLine: req.query.smoothLine !== 'false', + enableSplit: req.query.enableSplit === 'true', + splitIndex: parseInt(req.query.splitIndex) || 3, + leftLabel: req.query.leftLabel || '左侧', + rightLabel: req.query.rightLabel || '右侧', + splitStyle: req.query.splitStyle || 'solid', + width: parseInt(req.query.width) || 800, + height: parseInt(req.query.height) || 500, + format: req.query.format || 'png', + pixelRatio: parseInt(req.query.pixelRatio) || 2 + }; + + if (!params.data) { + return res.status(400).json({ error: '缺少 data 参数' }); + } + + // 解码 data（支持 URL 编码的换行符） + params.data = params.data.replace(/\\n/g, '\n'); + + const option = buildChartOption(params); + + const width = params.width; + const height = params.height; + const pixelRatio = params.pixelRatio; + + const canvas = createCanvas(width * pixelRatio, height * pixelRatio); + const chart = echarts.init(canvas, null, { + renderer: 'canvas', + width: width, + height: height, + devicePixelRatio: pixelRatio + }); + + chart.setOption(option); + + const buffer = canvas.toBuffer('image/png'); + res.set({ + 'Content-Type': 'image/png', + 'Content-Length': buffer.length, + 'X-Chart-Width': width, + 'X-Chart-Height': height + }); + res.send(buffer); + + chart.dispose(); + } catch (err) { + console.error('Chart generation error:', err); + res.status(500).json({ error: '图表生成失败: ' + err.message }); + } +}); + +// ===== API: 健康检查 ===== +app.get('/api/health', (req, res) => { + res.json({ + status: 'ok', + service: 'data-chart-tool', + version: '1.1.0', + endpoints: { + 'POST /api/chart': '生成图表图片（JSON body）', + 'GET /api/chart': '生成图表图片（URL 参数）', + 'GET /api/health': '健康检查' + } + }); +}); + +// ===== API: 文档/使用说明 ===== +app.get('/api/docs', (req, res) => { + res.json({ + name: '数据可视化图表生成器 API', + version: '1.1.0', + endpoints: [ + { + method: 'POST', + path: '/api/chart', + description: '通过 JSON 请求体生成图表图片', + 'Content-Type': 'application/json', + params: { + data: { type: 'string', required: true, description: 'CSV 格式数据（第一行表头，第一列横坐标）' }, + chartType: { type: 'string', default: 'bar', options: ['bar', 'line', 'bar-line'], description: '图表类型' }, + title: { type: 'string', default: '', description: '图表标题' }, + theme: { type: 'string', default: 'default', options: ['default', 'dark', 'macarons', 'gradient', 'retro'], description: '主题风格' }, + showLegend: { type: 'boolean', default: true, description: '是否显示图例' }, + showGrid: { type: 'boolean', default: true, description: '是否显示网格线' }, + showLabel: { type: 'boolean', default: false, description: '是否显示数据标签' }, + stackMode: { type: 'boolean', default: false, description: '是否堆叠模式' }, + smoothLine: { type: 'boolean', default: true, description: '折线图是否平滑' }, + enableSplit: { type: 'boolean', default: false, description: '是否启用区域分割' }, + splitIndex: { type: 'number', default: 3, description: '分割位置索引' }, + leftLabel: { type: 'string', default: '左侧', description: '左侧区域标签' }, + rightLabel: { type: 'string', default: '右侧', description: '右侧区域标签' }, + splitStyle: { type: 'string', default: 'solid', options: ['solid', 'dashed', 'dotted'], description: '分割线样式' }, + width: { type: 'number', default: 800, description: '图片宽度(px)' }, + height: { type: 'number', default: 500, description: '图片高度(px)' }, + format: { type: 'string', default: 'png', options: ['png'], description: '输出格式' }, + pixelRatio: { type: 'number', default: 2, description: '像素倍率（清晰度）' } + }, + returns: 'image/png', + example: { + request: `curl -X POST http://localhost:16023/api/chart \\ + -H "Content-Type: application/json" \\ + -d '{ + "data": "产品, Q1, Q2, Q3, Q4\\n手机, 1200, 1800, 2100, 2500\\n平板, 800, 950, 1100, 1300", + "chartType": "bar", + "title": "季度销售对比", + "theme": "default", + "width": 800, + "height": 500 + }' -o chart.png`, + response: 'PNG 图片二进制流' + } + }, + { + method: 'GET', + path: '/api/chart', + description: '通过 URL 参数生成图表图片（适合简单场景）', + params: { + data: { type: 'string', required: true, description: 'CSV 数据（换行用 \\n 分隔）' }, + type: { type: 'string', default: 'bar', description: '图表类型' }, + title: { type: 'string', description: '图表标题' }, + theme: { type: 'string', default: 'default', description: '主题风格' }, + width: { type: 'number', default: 800 }, + height: { type: 'number', default: 500 } + }, + returns: 'image/png', + example: { + request: `curl "http://localhost:16023/api/chart?data=产品,Q1,Q2\\n手机,100,200\\n平板,150,250&type=bar&title=测试" -o chart.png` + } + } + ] + }); +}); + +// ===== 启动服务 ===== +app.listen(PORT, '0.0.0.0', () => { + console.log(`🚀 数据可视化图表生成器已启动`); + console.log(`📊 Web UI: http://0.0.0.0:${PORT}`); + console.log(`📡 API: http://0.0.0.0:${PORT}/api/chart`); + console.log(`📖 文档: http://0.0.0.0:${PORT}/api/docs`); + console.log(`❤️ 健康: http://0.0.0.0:${PORT}/api/health`); +});