316 lines
10 KiB
Markdown
316 lines
10 KiB
Markdown
# 📊 chart-image
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**出版级图表图像,直接由数据生成。无需浏览器、无需 Puppeteer、无需原生编译。**
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直接从 JSON 数据生成精美的 PNG 图表——非常适合机器人、仪表盘、告警和自动化报告。可在任何运行 Node.js 的环境中使用。
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## 为什么选择 chart-image?
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大多数图表库需要浏览器(Puppeteer、Playwright)或原生依赖(`canvas`、`cairo`)。这意味着 400MB+ 的安装体积、令人头疼的 Docker 构建和缓慢的冷启动。
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**chart-image 使用 Vega-Lite + Sharp 及预编译二进制文件:**
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| | chart-image | Puppeteer + Chart.js | QuickChart.io |
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|---|---|---|---|
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| **安装体积** | ~15MB | ~400MB+ | 0(API) |
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| **原生依赖** | 无 | Chromium | 不适用 |
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| **冷启动** | <500ms | 2-5s | 网络延迟 |
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| **离线** | ✅ | ✅ | ❌ |
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| **Fly.io/Docker** | 开箱即用 | 痛苦 | 取决于可用性 |
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## 安装
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### 通过 ClawHub(推荐)
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```bash
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clawhub install chart-image
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```
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### 手动安装
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```bash
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git clone https://github.com/Cluka-399/chart-image.git skills/chart-image
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cd skills/chart-image/scripts && npm install
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```
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## 快速上手
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```bash
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node scripts/chart.mjs \
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--type line \
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--data '[{"x":"Mon","y":10},{"x":"Tue","y":25},{"x":"Wed","y":18}]' \
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--title "Weekly Trend" \
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--dark \
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--output chart.png
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```
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就这样。一条命令,一张 PNG。
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---
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## 图表类型
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### 📈 折线图
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追踪随时间变化的趋势。默认图表类型。
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```bash
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node scripts/chart.mjs --type line \
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--data '[{"x":"Mon","y":142},{"x":"Tue","y":148},{"x":"Wed","y":145},{"x":"Thu","y":155},{"x":"Fri","y":162}]' \
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--title "AAPL Weekly Price" --y-title "Price (USD)" \
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--dark --show-values --output chart.png
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```
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### 📊 柱状图
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并列比较不同类别。
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```bash
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node scripts/chart.mjs --type bar \
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--data '[{"x":"React","y":45},{"x":"Vue","y":28},{"x":"Svelte","y":15},{"x":"Angular","y":12}]' \
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--title "Framework Usage %" --output chart.png
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```
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### 🌊 面积图
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与折线图类似,但通过填充区域来强调数据量。
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```bash
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node scripts/chart.mjs --type area \
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--data '[{"x":"Jan","y":100},{"x":"Feb","y":250},{"x":"Mar","y":180},{"x":"Apr","y":420},{"x":"May","y":380},{"x":"Jun","y":520}]' \
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--title "Monthly Signups" --dark --output chart.png
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```
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### 🍩 环形图 / 饼图
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一目了然展示占比。使用 `--type pie` 显示实心圆,或 `--type donut` 显示环形样式。
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```bash
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node scripts/chart.mjs --type donut \
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--data '[{"x":"Desktop","y":58},{"x":"Mobile","y":35},{"x":"Tablet","y":7}]' \
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--title "Traffic by Device" --dark --output chart.png
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```
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### 📉 多系列折线图
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使用 `--series-field` 在一张图表上比较多条趋势。
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```bash
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node scripts/chart.mjs --type line \
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--data '[{"x":"Q1","y":30,"series":"2024"},{"x":"Q2","y":45,"series":"2024"},{"x":"Q3","y":52,"series":"2024"},{"x":"Q4","y":61,"series":"2024"},{"x":"Q1","y":40,"series":"2025"},{"x":"Q2","y":58,"series":"2025"},{"x":"Q3","y":72,"series":"2025"}]' \
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--title "Revenue Growth" --y-title "Revenue ($M)" \
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--series-field series --dark --legend top --output chart.png
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```
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### 📏 水平参考线
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使用 `--hline` 添加阈值、目标价位或买入价格。
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```bash
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node scripts/chart.mjs --type line \
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--data '[{"x":"Jan 1","y":0.00072},{"x":"Jan 5","y":0.00085},{"x":"Jan 10","y":0.00091},{"x":"Jan 15","y":0.00078},{"x":"Jan 20","y":0.00062},{"x":"Jan 25","y":0.00071}]' \
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--title "Token Price" --y-title "Price (USD)" \
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--dark --show-values --hline "0.0008,#e63946,Buy Price" --output chart.png
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```
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### 🎨 条件着色
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基于阈值对柱形/数据点着色——非常适合 KPI 仪表盘。
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```bash
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node scripts/chart.mjs --type bar \
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--data '[{"month":"Jan","score":72},{"month":"Feb","score":45},{"month":"Mar","score":38},{"month":"Apr","score":61},{"month":"May","score":29},{"month":"Jun","score":55},{"month":"Jul","score":82},{"month":"Aug","score":47},{"month":"Sep","score":68},{"month":"Oct","score":34},{"month":"Nov","score":76},{"month":"Dec","score":91}]' \
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--x-field month --y-field score --x-sort none \
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--conditional-color "50,#e63946,#2a9d8f" --hline "50,#888,Target" \
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--title "Monthly Performance Score" --subtitle "Target: 50" --dark
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```
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### ↔️ 水平柱状图
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翻转坐标轴,适用于排行榜、排名或较长的类别名称。
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```bash
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node scripts/chart.mjs --type bar \
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--data '[{"lang":"Python","stars":95},{"lang":"JavaScript","stars":82},{"lang":"TypeScript","stars":78},{"lang":"Rust","stars":71},{"lang":"Go","stars":63},{"lang":"Java","stars":58},{"lang":"C++","stars":45},{"lang":"Swift","stars":38}]' \
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--x-field lang --y-field stars --horizontal --sort desc \
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--conditional-color "60,#e63946,#2a9d8f" --bar-labels \
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--title "GitHub Stars by Language" --dark
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```
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### 更多图表类型
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- **`point`** — 散点图
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- **`candlestick`** — OHLC 金融图表(`--open-field`、`--high-field`、`--low-field`、`--close-field`)
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- **`heatmap`** — 网格可视化(`--color-value-field`、`--color-scheme viridis`)
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- **堆叠柱状图** — `--type bar --stacked --color-field category`
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- **成交量叠加** — 使用 `--volume-field` 的双 Y 轴
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- **迷你图** — 使用 `--sparkline` 的小型内联图表(80×20,无坐标轴)
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---
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## 简写语法
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不想写 JSON?使用简写格式:
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```bash
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node scripts/chart.mjs --type bar \
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--data "Mon:10,Tue:25,Wed:18,Thu:30,Fri:22,Sat:35,Sun:28" \
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--title "Weekly Activity" --dark --output chart.png
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```
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格式:`label:value,label:value,...`
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---
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## 深色模式与浅色模式
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使用 `--dark` 实现深色背景(非常适合 Discord、Slack、深色仪表盘):
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省略 `--dark` 则为浅色模式(报告、邮件、浅色界面):
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**给机器人的提示:** 根据时间自动切换——在 20:00–07:00 之间使用 `--dark`。
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---
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## 告警样式图表
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针对监控和告警场景的内置选项:
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```bash
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node scripts/chart.mjs --type line --data '[...]' \
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--title "Iran Strike Odds (48h)" \
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--show-change --focus-change --show-values --dark \
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--output alert.png
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```
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| 选项 | 效果 |
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|------|--------|
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| `--show-change` | 标注首尾数据点的变化百分比 |
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| `--focus-change` | 将 Y 轴缩放至数据范围的 2 倍以突出变化 |
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| `--focus-recent N` | 仅显示最后 N 个数据点 |
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| `--show-values` | 在图表上标注最大值/最小值峰值 |
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---
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## 数据管道输入
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从标准输入读取:
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```bash
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curl -s api.example.com/metrics | node scripts/chart.mjs --type line --dark --output metrics.png
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echo '[{"x":"A","y":1},{"x":"B","y":2}]' | node scripts/chart.mjs --output out.png
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```
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---
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## 选项参考
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### 核心
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| 选项 | 描述 | 默认值 |
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|--------|-------------|---------|
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| `--type` | `line`、`bar`、`area`、`point`、`pie`、`donut`、`candlestick`、`heatmap` | `line` |
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| `--data` | JSON 数组或简写 `key:val,...` | 标准输入 |
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| `--output` | 输出文件路径 | `chart.png` |
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| `--title` | 图表标题 | — |
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| `--subtitle` | 标题下方的副标题 | — |
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| `--width` | 宽度(像素) | `600` |
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| `--height` | 高度(像素) | `300` |
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| `--dark` | 深色主题 | `false` |
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| `--svg` | 输出 SVG 而非 PNG | `false` |
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### 坐标轴
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| 选项 | 描述 | 默认值 |
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|--------|-------------|---------|
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| `--x-field` | X 轴字段名 | `x` |
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| `--y-field` | Y 轴字段名 | `y` |
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| `--x-title` / `--y-title` | 坐标轴标签 | 字段名 |
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| `--x-type` | `ordinal`、`temporal`、`quantitative` | `ordinal` |
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| `--y-domain` | Y 轴范围,格式为 `"min,max"` | 自动 |
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| `--y-format` | `percent`、`dollar`、`compact`、`decimal4`、`integer`、`scientific` | 自动 |
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### 样式
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| 选项 | 描述 | 默认值 |
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|--------|-------------|---------|
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| `--color` | 主色调 | `#e63946` |
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| `--color-scheme` | Vega 配色方案(例如 `viridis`、`category10`) | — |
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| `--no-grid` | 移除网格线 | `false` |
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| `--legend` | `top`、`bottom`、`left`、`right`、`none` | — |
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| `--hline` | 参考线:`"value,color,label"`(可重复) | — |
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### 多系列
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| 选项 | 描述 |
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|--------|-------------|
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| `--series-field` | 分割为多条线的字段 |
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| `--stacked` | 堆叠柱状图/面积图 |
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| `--color-field` | 颜色编码的字段 |
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### 注释
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| 选项 | 描述 |
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|--------|-------------|
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| `--show-change` | 显示变化百分比标注 |
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| `--focus-change` | 缩放 Y 轴以突出变化 |
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| `--focus-recent N` | 仅显示最后 N 个数据点 |
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| `--show-values` | 标注最大值/最小值峰值 |
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| `--annotations` | 事件标记的 JSON 数组:`[{"x":"14:00","label":"News"}]` |
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---
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## Y 轴格式
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```bash
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--y-format dollar # → $1,234.56
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--y-format percent # → 45.2%
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--y-format compact # → 1.2K、3.4M
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--y-format decimal4 # → 0.0004
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--y-format integer # → 1,234
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```
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或者传入任意 [d3-format](https://github.com/d3/d3-format) 格式字符串:`--y-format ',.3f'`
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---
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## 专为 Fly.io / VPS / Docker 设计
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本技能专为无头服务器环境打造,在这些环境中你无法(或不想)安装浏览器:
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- **Fly.io** — 在 `flyctl deploy` 上开箱即用。无需特殊 Dockerfile。
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- **Docker** — 无需 `apt-get install` 安装 Cairo/Pango 等。只需 `npm install`。
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- **VPS** — 可在任何安装了 Node.js 18+ 的机器上运行。无需 GPU,无需显示服务器。
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- **CI/CD** — 在 GitHub Actions、GitLab CI 等环境中生成图表。
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秘诀:[Vega-Lite](https://vega.github.io/vega-lite/) 原生渲染为 SVG,然后 [Sharp](https://sharp.pixelplumbing.com/)(使用预编译的 libvips 二进制文件)将其转换为 PNG。全程无需浏览器参与。
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---
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## 许可证
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MIT
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---
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<p align="center">
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<sub>由 <a href="https://clawhub.ai/u/Cluka-399">@Cluka-399</a> 构建 · 发布在 <a href="https://clawhub.ai">ClawHub</a> · <a href="https://github.com/Cluka-399/chart-image">GitHub</a></sub>
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</p>
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