Initial commit: Modular personal toolbox with high-fidelity Chinese stroke order tool and CI/CD

.gitea/workflows/docker-publish.yml

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+name: Build and Push Docker Image
+
+on:
+  push:
+    branches: [ "main" ]
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    env:
+      # 指向 K8s Runner 中共享挂载的 Socket 路径
+      DOCKER_HOST: unix:///run/docker.sock
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v4
+
+      - name: Log in to Gitea Registry
+        run: echo "${{ secrets.PUSH_TOKEN }}" | docker login git.pengzhan.dev -u "${{ github.actor }}" --password-stdin
+
+      - name: Build and push Docker image
+        run: |
+          REPO_LOWER=$(echo "${{ github.repository }}" | tr '[:upper:]' '[:lower:]')
+          IMAGE_NAME="git.pengzhan.dev/$REPO_LOWER"
+          docker build -t $IMAGE_NAME:latest -t $IMAGE_NAME:${{ github.sha }} .
+          docker push $IMAGE_NAME:latest
+          docker push $IMAGE_NAME:${{ github.sha }}

.gitignore

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+# Binaries
+toolbox
+*.exe
+*.exe~
+*.dll
+*.so
+*.dylib
+
+# Dependency directories
+vendor/
+.venv/
+
+# IDEs
+.idea/
+.vscode/
+*.swp
+*.swo
+
+# OS files
+.DS_Store
+
+# Data (if you want to exclude original design data, but here we include pkg/jitie/data)
+# data/

Dockerfile

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+# --- Build Stage ---
+FROM golang:1.25-alpine AS builder
+
+WORKDIR /app
+
+# Install build dependencies
+RUN apk add --no-cache git
+
+# Download dependencies
+COPY go.mod go.sum ./
+RUN go mod download
+
+# Copy source and data
+COPY cmd/ ./cmd/
+COPY pkg/ ./pkg/
+
+# Build the binary
+RUN CGO_ENABLED=0 GOOS=linux go build -o /toolbox cmd/toolbox/main.go
+
+# --- Final Stage ---
+FROM alpine:latest
+
+# Basic security & CA certs
+RUN apk --no-cache add ca-certificates tzdata
+WORKDIR /root/
+
+# Copy binary from builder
+COPY --from=builder /toolbox .
+
+# Default environment
+ENV PORT=8080
+EXPOSE 8080
+
+CMD ["./toolbox"]

README.md

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+# 个人工具箱 (Own-Tools)
+
+这是一个基于 Go 语言构建的模块化个人工具箱。目前已实现核心功能：**汉字字帖生成器**。
+
+## 🌟 核心特性
+
+- **全内嵌部署**：所有前端静态资源、汉字笔顺数据（9574个字）以及字体文件均通过 `go:embed` 打包进单个二进制文件。
+- **高性能渲染**：原生 Go 实现的矢量 PDF 绘图，支持贝塞尔曲线平滑采样，生成高质量、不失真的字帖。
+- **模块化架构**：采用插件化设计（`pkg/base` 接口），可轻松扩展新工具。
+- **云原生就绪**：提供多阶段构建的 Dockerfile，并集成了 Gitea Actions CI/CD。
+
+## 🛠 已集成工具
+
+### 汉字字帖生成器 (`jitie`)
+- **教学字帖 (2x3)**：带红色圆圈序号、方向箭头和骨架红线的专业临摹贴。
+- **步进分解 (9列)**：米字格背景，逐笔展示汉字书写过程，支持多字连续排版。
+- **智能适配**：自动适配 A4 和 Letter 纸张尺寸。
+
+## 🚀 快速开始
+
+### 本地运行 (已有编译好的二进制文件)
+```bash
+./toolbox -port 8888
+```
+访问 `http://localhost:8888` 即可开始使用。
+
+### 从源码编译
+确保已安装 Go 1.23+。
+```bash
+go build -o toolbox cmd/toolbox/main.go
+```
+
+### 命令行参数
+- `-port`: 指定 Web 服务端口（默认 8080，优先级高于环境变量）。
+
+## 🐳 容器化部署
+
+### 环境变量
+- `PORT`: 容器内监听端口（默认 8080）。
+
+### 构建镜像
+```bash
+docker build -t toolbox:latest .
+```
+
+### 运行镜像
+```bash
+docker run -p 8080:8080 toolbox:latest
+```
+
+## 📂 项目结构
+
+- `cmd/toolbox/`: 程序入口及内嵌前端网页。
+- `pkg/base/`: 工具标准接口定义及自动注册中心。
+- `pkg/jitie/`: 汉字字帖工具实现。
+    - `data/`: 内嵌的 30MB 完整字库及字体。
+    - `logic/`: PDF 渲染、SVG 解析、避让算法逻辑。
+- `.gitea/workflows/`: CI/CD 自动化流水线配置。
+- `design/`: 项目设计文档。
+
+## 📝 许可证
+自用工具，遵循 MIT 协议。

cmd/toolbox/main.go

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+package main
+
+import (
+	"embed"
+	"flag"
+	"io/fs"
+	"log"
+	"net/http"
+	"os"
+	"strconv"
+	"toolbox/pkg/base"
+	_ "toolbox/pkg/jitie" // 匿名导入以触发 init()
+
+	"github.com/gin-gonic/gin"
+)
+
+//go:embed web/*
+var webFS embed.FS
+
+func main() {
+	// 定义端口 Flag
+	portFlag := flag.Int("port", 0, "端口号 (优先于环境变量 PORT)")
+	flag.Parse()
+
+	// 禁用 Gin 的默认重定向逻辑，防止与静态资源冲突
+	r := gin.New()
+	r.Use(gin.Logger(), gin.Recovery())
+	r.RedirectTrailingSlash = false
+	r.RedirectFixedPath = false
+
+	// 1. 自动发现并注册工具路由
+	api := r.Group("/api")
+	{
+		for id, tool := range base.Registry {
+			log.Printf("Loading tool: %s (%s)", tool.Name(), id)
+			if err := tool.Init(); err != nil {
+				log.Fatalf("Failed to initialize tool %s: %v", id, err)
+			}
+			group := api.Group("/" + id)
+			tool.RegisterRoutes(group)
+		}
+	}
+
+	// 2. 静态资源路由 (内嵌前端)
+	// 根路径直接返回 index.html 内容，不使用文件服务器转发
+	r.GET("/", func(c *gin.Context) {
+		content, err := webFS.ReadFile("web/index.html")
+		if err != nil {
+			c.String(http.StatusNotFound, "index.html not found")
+			return
+		}
+		c.Data(http.StatusOK, "text/html; charset=utf-8", content)
+	})
+
+	// 如果将来有 css/js，可以挂载到 /web 路径
+	subFS, _ := fs.Sub(webFS, "web")
+	r.StaticFS("/web", http.FS(subFS))
+
+	// 3. 工具列表发现接口
+	r.GET("/api/tools", func(c *gin.Context) {
+		var list []map[string]string
+		for _, t := range base.Registry {
+			list = append(list, map[string]string{
+				"id":   t.ID(),
+				"name": t.Name(),
+				"desc": t.Description(),
+			})
+		}
+		c.JSON(http.StatusOK, list)
+	})
+
+	// 4. 确定最终使用的端口
+	var finalPort string
+	if *portFlag > 0 {
+		finalPort = strconv.Itoa(*portFlag)
+	} else if envPort := os.Getenv("PORT"); envPort != "" {
+		finalPort = envPort
+	} else {
+		finalPort = "8080"
+	}
+
+	log.Printf("Toolbox server starting on :%s", finalPort)
+	if err := r.Run(":" + finalPort); err != nil {
+		log.Fatalf("Server failed: %v", err)
+	}
+}

cmd/toolbox/web/index.html

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+<!DOCTYPE html>
+<html lang="zh-CN">
+<head>
+    <meta charset="UTF-8">
+    <meta name="viewport" content="width=device-width, initial-scale=1.0">
+    <title>个人工具箱 - 汉字字帖生成器</title>
+    <style>
+        body {
+            font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
+            margin: 0;
+            padding: 0;
+            background-color: #f5f5f7;
+            color: #1d1d1f;
+        }
+        .container {
+            max-width: 1000px;
+            margin: 0 auto;
+            padding: 40px 20px;
+            display: flex;
+            flex-direction: column;
+            gap: 24px;
+        }
+        header {
+            text-align: center;
+            margin-bottom: 10px;
+        }
+        header h1 { font-size: 32px; margin-bottom: 8px; }
+        header p { color: #86868b; margin: 0; }
+
+        .card {
+            background: white;
+            border-radius: 16px;
+            padding: 28px;
+            box-shadow: 0 8px 30px rgba(0,0,0,0.04);
+        }
+        
+        .form-layout {
+            display: flex;
+            flex-direction: column;
+            gap: 20px;
+        }
+
+        .input-row-top {
+            width: 100%;
+        }
+
+        .input-row-bottom {
+            display: flex;
+            gap: 16px;
+            align-items: flex-end;
+        }
+
+        .input-group {
+            display: flex;
+            flex-direction: column;
+            gap: 8px;
+        }
+        .input-group.flex-main { flex: 2; }
+        .input-group.flex-side { flex: 1; }
+
+        label {
+            font-size: 13px;
+            font-weight: 600;
+            color: #1d1d1f;
+            text-transform: uppercase;
+            letter-spacing: 0.5px;
+        }
+        
+        input[type="text"] {
+            width: 100%;
+            box-sizing: border-box;
+            padding: 14px 16px;
+            border: 1px solid #d2d2d7;
+            border-radius: 10px;
+            font-size: 18px;
+            background-color: #fbfbfd;
+            transition: all 0.2s;
+        }
+        input[type="text"]:focus {
+            border-color: #0071e3;
+            background-color: #fff;
+            box-shadow: 0 0 0 4px rgba(0,113,227,0.1);
+            outline: none;
+        }
+
+        select {
+            appearance: none;
+            padding: 12px 16px;
+            border: 1px solid #d2d2d7;
+            border-radius: 10px;
+            font-size: 15px;
+            background-color: #fbfbfd;
+            cursor: pointer;
+        }
+
+        button {
+            background-color: #0071e3;
+            color: white;
+            border: none;
+            padding: 14px 32px;
+            border-radius: 10px;
+            font-size: 16px;
+            font-weight: 600;
+            cursor: pointer;
+            transition: all 0.2s;
+            height: 48px;
+        }
+        button:hover { background-color: #0077ed; transform: translateY(-1px); }
+        button:active { transform: translateY(0); }
+
+        #preview-container {
+            width: 100%;
+            height: 850px;
+            border-radius: 16px;
+            overflow: hidden;
+            background: #fff;
+            box-shadow: 0 4px 20px rgba(0,0,0,0.08);
+            display: none;
+        }
+        iframe { width: 100%; height: 100%; border: none; }
+        
+        .empty-state {
+            text-align: center;
+            padding: 80px 0;
+            border: 2px dashed #d2d2d7;
+            border-radius: 16px;
+            color: #86868b;
+        }
+    </style>
+</head>
+<body>
+    <div class="container">
+        <header>
+            <h1>汉字字帖工具箱</h1>
+            <p>生成标准笔顺教学字帖，支持 A4/Letter 打印</p>
+        </header>
+
+        <div class="card">
+            <div class="form-layout">
+                <div class="input-row-top">
+                    <div class="input-group">
+                        <label for="chars">输入想要生成的汉字</label>
+                        <input type="text" id="chars" placeholder="例如：永和九年，岁在癸丑..." value="永">
+                    </div>
+                </div>
+                <div class="input-row-bottom">
+                    <div class="input-group flex-main">
+                        <label for="mode">布局模式</label>
+                        <select id="mode">
+                            <option value="teaching">2x3 教学方格 (带笔顺、箭头、序号)</option>
+                            <option value="step">步进式分解 (逐笔展示过程)</option>
+                        </select>
+                    </div>
+                    <div class="input-group flex-side">
+                        <label for="paper_size">纸张大小</label>
+                        <select id="paper_size">
+                            <option value="A4">A4 (210x297mm)</option>
+                            <option value="Letter">Letter (8.5x11in)</option>
+                        </select>
+                    </div>
+                    <button onclick="generatePDF()">生成预览</button>
+                </div>
+            </div>
+        </div>
+
+        <div id="preview-container">
+            <iframe id="pdf-frame"></iframe>
+        </div>
+        
+        <div id="empty-state" class="empty-state">
+            <p>在上方输入汉字并点击按钮，即可生成高清矢量字帖预览</p>
+        </div>
+    </div>
+
+    <script>
+        async function generatePDF() {
+            const chars = document.getElementById('chars').value;
+            const mode = document.getElementById('mode').value;
+            const paper_size = document.getElementById('paper_size').value;
+
+            if (!chars.trim()) {
+                alert('请输入汉字');
+                return;
+            }
+
+            const btn = document.querySelector('button');
+            const originalText = btn.innerText;
+            btn.innerText = '正在绘图中...';
+            btn.disabled = true;
+
+            try {
+                const response = await fetch('/api/jitie/generate', {
+                    method: 'POST',
+                    headers: { 'Content-Type': 'application/json' },
+                    body: JSON.stringify({
+                        chars: chars,
+                        mode: mode,
+                        flip_y: true,
+                        paper_size: paper_size
+                    })
+                });
+
+                if (response.ok) {
+                    const blob = await response.blob();
+                    const url = URL.createObjectURL(blob);
+                    
+                    document.getElementById('empty-state').style.display = 'none';
+                    const container = document.getElementById('preview-container');
+                    container.style.display = 'block';
+                    document.getElementById('pdf-frame').src = url;
+                } else {
+                    const err = await response.json();
+                    alert('生成失败: ' + (err.error || '未知错误'));
+                }
+            } catch (e) {
+                alert('网络请求失败，请检查后端服务是否运行');
+            } finally {
+                btn.innerText = originalText;
+                btn.disabled = false;
+            }
+        }
+    </script>
+</body>
+</html>

deploy/k8s.yaml

@@ -0,0 +1,65 @@
+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: own-tools
+  labels:
+    app: own-tools
+spec:
+  replicas: 1
+  selector:
+    matchLabels:
+      app: own-tools
+  template:
+    metadata:
+      labels:
+        app: own-tools
+    spec:
+      containers:
+      - name: toolbox
+        # TODO: 确认你的 Gitea 镜像完整路径
+        image: git.pengzhan.dev/haopengzhan/own-tools:latest
+        imagePullPolicy: Always
+        ports:
+        - containerPort: 8080
+        env:
+        - name: PORT
+          value: "8080"
+        resources:
+          limits:
+            cpu: "500m"
+            memory: "256Mi"
+          requests:
+            cpu: "100m"
+            memory: "128Mi"
+---
+apiVersion: v1
+kind: Service
+metadata:
+  name: own-tools-service
+spec:
+  selector:
+    app: own-tools
+  ports:
+    - protocol: TCP
+      port: 80
+      targetPort: 8080
+  type: ClusterIP
+---
+apiVersion: networking.k8s.io/v1
+kind: Ingress
+metadata:
+  name: own-tools-ingress
+  annotations:
+    kubernetes.io/ingress.class: traefik
+spec:
+  rules:
+  - host: toolbox.pengzhan.dev  # 请修改为你的实际域名
+    http:
+      paths:
+      - path: /
+        pathType: Prefix
+        backend:
+          service:
+            name: own-tools-service
+            port:
+              number: 80

design/detailed_design.md

@@ -0,0 +1,56 @@
+# 个人工具箱 - 汉字字帖生成器详细设计
+
+## 1. 项目目标
+构建一个基于 Python 的 Web 工具箱，首期功能为生成两种类型的汉字书写字帖：
+1. **步进式字帖**：展示汉字书写的每一笔过程。
+2. **教学式大方格**：带笔顺序号、方向箭头和灰色临摹底样的 2x3 大格。
+
+## 2. 技术栈选择
+- **核心语言**: Python 3.10+
+- **Web 框架**: **Streamlit** (用于快速构建交互式 UI) 或 **FastAPI** (如果后续需要更复杂的前后端分离)。初版建议使用 Streamlit 以减少 JS 代码量。
+- **绘图引擎**: **Pillow (PIL)** (生成图片) 或 **ReportLab / fpdf2** (直接生成可打印的 PDF)。
+- **数据源**: [Hanzi Writer Data](https://github.com/chanind/hanzi-writer-data) (提供汉字笔画的 SVG Path 数据和中轴线坐标)。
+
+## 3. 核心功能设计
+
+### 3.1 数据层 (Data Provider)
+- **职责**: 加载和缓存汉字笔画 JSON 数据。
+- **实现**:
+    - 下载常用汉字的 JSON 文件并存储在本地。
+    - 结构化解析 `strokes` (SVG 路径字符串) 和 `medians` (笔画中轴线坐标序列)。
+
+### 3.2 渲染引擎 (Character Renderer)
+- **SVG 解析**: 使用 `svgpath2lines` 或类似库将 SVG Path 转换为坐标点。
+- **步进逻辑 (Step-by-Step)**:
+    - 输入：汉字，方格大小。
+    - 循环：对于第 $i$ 个笔画，在第 $i$ 个格子中绘制 `strokes[0...i]`。
+    - 样式：当前笔画（第 $i$ 笔）用黑色，之前的笔画用浅灰色或同样黑色。
+- **标注逻辑 (Annotated Square)**:
+    - **底样**: 绘制所有笔画，颜色设为浅灰 (e.g., `#D3D3D3`)。
+    - **序号**: 在每一笔 `medians[i]` 的第一个坐标点附近标注数字 $i+1$。
+    - **箭头**: 
+        - 取 `medians[i]` 的前两个点 $P_1(x_1, y_1)$ 和 $P_2(x_2, y_2)$。
+        - 计算向量 $\vec{V} = P_2 - P_1$。
+        - 在 $P_1$ 处绘制指向 $P_2$ 方向的箭头。
+
+### 3.3 导出模块 (Exporter)
+- **PDF 导出**: 使用 `fpdf2` 布局页面（A4 纸张），将生成的图片或绘制指令排列在页面上。
+- **预览**: 在 Web 界面实时展示生成的 PNG 图片。
+
+## 4. 界面设计 (Web UI)
+- **侧边栏**: 选择字帖类型（步进式/教学式）、字体大小、纸张方向。
+- **输入区**: 文本框输入目标汉字（支持多个字）。
+- **展示区**: 实时生成字帖预览。
+- **下载区**: 点击按钮下载 PDF 打印版。
+
+## 5. 待解决的技术细节
+- **SVG 坐标对齐**: 汉字数据通常基于 1024x1024 的坐标系，需要缩放到 PDF 或图片的分辨率。
+- **箭头绘制逻辑**: 处理极短笔画（如“点”）时的箭头方向问题。
+- **田字格背景**: 需要在渲染汉字前绘制标准的“田”字虚线格。
+
+## 6. 实施步骤
+1. **环境准备**: 安装 `streamlit`, `pillow`, `fpdf2`, `requests`。
+2. **数据爬取/获取**: 编写脚本从 Hanzi Writer CDN 获取指定汉字的 JSON 数据。
+3. **原型开发**: 先在本地用 Pillow 生成一张带箭头和数字的单个汉字图片。
+4. **Web 包装**: 使用 Streamlit 搭建界面。
+5. **PDF 布局优化**: 实现多字排版和打印优化。

design/mvp.md

@@ -0,0 +1,15 @@
+# 个人工具箱
+
+一个web based的网站，提供各种工具
+
+## 中文书写字帖生成
+
+类似于https://www.nqez.com/，但是这个网站里的字帖种类非常丰富了，我只是想先专注于最简单的两种字帖生成。
+
+一种是在小田字格一排。分别是字的全貌、字的第一笔，第一笔和第二笔。。。。。如果有空，就留空。
+
+一种是给定字，在纸上生成2*3 6个大方格，每个方格里是灰色的字，同时有小字序号和箭头表示每一笔从哪里写到哪里。
+
+你觉得这个需求可以做吗？
+
+怎么实现，请给我一个方案。

go.mod

@@ -0,0 +1,42 @@
+module toolbox
+
+go 1.25.7
+
+require (
+	github.com/gin-gonic/gin v1.11.0
+	github.com/signintech/gopdf v0.36.0
+)
+
+require (
+	github.com/bytedance/gopkg v0.1.3 // indirect
+	github.com/bytedance/sonic v1.15.0 // indirect
+	github.com/bytedance/sonic/loader v0.5.0 // indirect
+	github.com/cloudwego/base64x v0.1.6 // indirect
+	github.com/gabriel-vasile/mimetype v1.4.13 // indirect
+	github.com/gin-contrib/sse v1.1.0 // indirect
+	github.com/go-playground/locales v0.14.1 // indirect
+	github.com/go-playground/universal-translator v0.18.1 // indirect
+	github.com/go-playground/validator/v10 v10.30.1 // indirect
+	github.com/goccy/go-json v0.10.5 // indirect
+	github.com/goccy/go-yaml v1.19.2 // indirect
+	github.com/json-iterator/go v1.1.12 // indirect
+	github.com/klauspost/cpuid/v2 v2.3.0 // indirect
+	github.com/leodido/go-urn v1.4.0 // indirect
+	github.com/mattn/go-isatty v0.0.20 // indirect
+	github.com/modern-go/concurrent v0.0.0-20180306012644-bacd9c7ef1dd // indirect
+	github.com/modern-go/reflect2 v1.0.2 // indirect
+	github.com/pelletier/go-toml/v2 v2.2.4 // indirect
+	github.com/phpdave11/gofpdi v1.0.15 // indirect
+	github.com/pkg/errors v0.9.1 // indirect
+	github.com/quic-go/qpack v0.6.0 // indirect
+	github.com/quic-go/quic-go v0.59.0 // indirect
+	github.com/twitchyliquid64/golang-asm v0.15.1 // indirect
+	github.com/ugorji/go/codec v1.3.1 // indirect
+	go.uber.org/mock v0.6.0 // indirect
+	golang.org/x/arch v0.24.0 // indirect
+	golang.org/x/crypto v0.48.0 // indirect
+	golang.org/x/net v0.50.0 // indirect
+	golang.org/x/sys v0.41.0 // indirect
+	golang.org/x/text v0.34.0 // indirect
+	google.golang.org/protobuf v1.36.11 // indirect
+)

go.sum

@@ -0,0 +1,95 @@
+github.com/bytedance/gopkg v0.1.3 h1:TPBSwH8RsouGCBcMBktLt1AymVo2TVsBVCY4b6TnZ/M=
+github.com/bytedance/gopkg v0.1.3/go.mod h1:576VvJ+eJgyCzdjS+c4+77QF3p7ubbtiKARP3TxducM=
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+gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
+gopkg.in/yaml.v3 v3.0.1 h1:fxVm/GzAzEWqLHuvctI91KS9hhNmmWOoWu0XTYJS7CA=
+gopkg.in/yaml.v3 v3.0.1/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=

pkg/base/tool.go

@@ -0,0 +1,22 @@
+package base
+
+import (
+	"github.com/gin-gonic/gin"
+)
+
+// Tool 定义了工具箱中每个子工具必须实现的接口
+type Tool interface {
+	ID() string          // 工具的唯一标识，用于路由前缀，如 "jitie"
+	Name() string        // 工具的显示名称
+	Description() string // 工具的描述
+	Init() error         // 初始化逻辑，如加载 embed 的数据
+	RegisterRoutes(r *gin.RouterGroup) // 注册该工具的 API 路由
+}
+
+// Registry 存储所有已注册的工具
+var Registry = make(map[string]Tool)
+
+// Register 用于工具在 init() 函数中注册自己
+func Register(t Tool) {
+	Registry[t.ID()] = t
+}

pkg/jitie/logic/pdf.go

@@ -0,0 +1,330 @@
+package logic
+
+import (
+	"bytes"
+	"math"
+	"regexp"
+	"strconv"
+
+	"github.com/signintech/gopdf"
+)
+
+var embeddedFont []byte
+
+func SetFontData(data []byte) {
+	embeddedFont = data
+}
+
+// GeneratePDF 生成 PDF 字节流
+func GeneratePDF(chars []HanziData, mode, paperSize string, flipY bool) ([]byte, error) {
+	pdf := &gopdf.GoPdf{}
+	
+	rect := gopdf.Rect{W: 595.28, H: 841.89} // A4 default
+	if paperSize == "Letter" {
+		rect = gopdf.Rect{W: 612, H: 792}
+	}
+	pdf.Start(gopdf.Config{PageSize: rect})
+
+	if len(embeddedFont) > 0 {
+		_ = pdf.AddTTFFontData("font", embeddedFont)
+	}
+
+	if mode == "step" {
+		addStepPages(pdf, chars, flipY, rect.W, rect.H)
+	} else {
+		addTeachingPages(pdf, chars, flipY, rect.W, rect.H)
+	}
+
+	var buf bytes.Buffer
+	_, err := pdf.WriteTo(&buf)
+	return buf.Bytes(), err
+}
+
+func addTeachingPages(pdf *gopdf.GoPdf, chars []HanziData, flipY bool, pW, pH float64) {
+	cols, rows := 2, 3
+	gap := 17.0 
+	margin := 40.0
+
+	cellW := (pW - 2*margin - float64(cols-1)*gap) / float64(cols)
+	cellH := (pH - 2*margin - float64(rows-1)*gap) / float64(rows)
+	size := math.Min(cellW, cellH)
+
+	totalW := float64(cols)*size + float64(cols-1)*gap
+	totalH := float64(rows)*size + float64(rows-1)*gap
+	marginX := (pW - totalW) / 2
+	marginY := (pH - totalH) / 2
+
+	for i := 0; i < len(chars); i += 6 {
+		pdf.AddPage()
+		end := i + 6
+		if end > len(chars) {
+			end = len(chars)
+		}
+		batch := chars[i:end]
+
+		for idx, data := range batch {
+			c, r := idx%cols, idx/cols
+			x := marginX + float64(c)*(size+gap)
+			y := marginY + float64(r)*(size+gap)
+			drawCharacter(pdf, data, x, y, size, flipY, len(data.Strokes), true)
+		}
+	}
+}
+
+func addStepPages(pdf *gopdf.GoPdf, chars []HanziData, flipY bool, pW, pH float64) {
+	cols := 9
+	margin := 30.0
+	size := (pW - 2*margin) / float64(cols)
+	
+	pdf.AddPage()
+	currY := margin
+
+	for _, data := range chars {
+		numStrokes := len(data.Strokes)
+		rowsNeeded := 1
+		if numStrokes > 8 {
+			rowsNeeded = 1 + (numStrokes - 8 + 7) / 8
+		}
+
+		if currY + float64(rowsNeeded)*size > pH - margin {
+			pdf.AddPage()
+			currY = margin
+		}
+
+		totalGridsInRows := rowsNeeded * cols
+		strokeCounter := 0 
+		
+		for gridIdx := 0; gridIdx < totalGridsInRows; gridIdx++ {
+			rowInChar := gridIdx / cols
+			colInChar := gridIdx % cols
+			x := margin + float64(colInChar)*size
+			y := currY + float64(rowInChar)*size
+			
+			if rowInChar == 0 && colInChar == 0 {
+				drawCharacter(pdf, data, x, y, size, flipY, len(data.Strokes), false)
+				strokeCounter = 1
+			} else if rowInChar > 0 && colInChar == 0 {
+				drawMiZiGe(pdf, x, y, size)
+			} else if strokeCounter <= numStrokes {
+				drawStepBox(pdf, data, x, y, size, flipY, strokeCounter)
+				strokeCounter++
+			} else {
+				drawMiZiGe(pdf, x, y, size)
+			}
+		}
+		currY += float64(rowsNeeded) * size
+	}
+}
+
+func drawStepBox(pdf *gopdf.GoPdf, data HanziData, x, y, size float64, flipY bool, strokeLimit int) {
+	drawMiZiGe(pdf, x, y, size)
+	padding := size * 0.12
+	drawSize := size - 2*padding
+	scale := drawSize / 1024.0
+	offsetX := x + padding
+	offsetY := y + padding
+
+	pdf.SetFillColor(180, 180, 180) 
+	for i := 0; i < strokeLimit; i++ {
+		points := parseSVGPath(data.Strokes[i], scale, offsetX, offsetY, flipY)
+		if len(points) > 2 {
+			pdf.Polygon(points, "F")
+		}
+	}
+}
+
+func drawCharacter(pdf *gopdf.GoPdf, data HanziData, x, y, size float64, flipY bool, strokeLimit int, showAnnotations bool) {
+	if showAnnotations {
+		drawGrid(pdf, x, y, size) 
+	} else {
+		drawMiZiGe(pdf, x, y, size)
+	}
+
+	padding := size * 0.12
+	drawSize := size - 2*padding
+	scale := drawSize / 1024.0
+	offsetX := x + padding
+	offsetY := y + padding
+
+	isFull := strokeLimit == len(data.Strokes)
+	if isFull {
+		if showAnnotations {
+			pdf.SetFillColor(240, 240, 240)
+		} else {
+			pdf.SetFillColor(0, 0, 0)
+		}
+	} else {
+		pdf.SetFillColor(180, 180, 180)
+	}
+
+	for sIdx := 0; sIdx < len(data.Strokes); sIdx++ {
+		if sIdx >= strokeLimit && !isFull {
+			break
+		}
+		points := parseSVGPath(data.Strokes[sIdx], scale, offsetX, offsetY, flipY)
+		if len(points) > 2 {
+			pdf.Polygon(points, "F")
+		}
+	}
+
+	if showAnnotations && isFull {
+		fontSize := size * 0.035
+		if len(embeddedFont) > 0 {
+			_ = pdf.SetFont("font", "", fontSize)
+		}
+		for idx, median := range data.Medians {
+			mPoints := transformPoints(median, scale, offsetX, offsetY, flipY)
+			if len(mPoints) < 2 { continue }
+
+			pdf.SetStrokeColor(255, 0, 0)
+			pdf.SetLineWidth(0.6)
+			for j := 0; j < len(mPoints)-1; j++ {
+				pdf.Line(mPoints[j].X, mPoints[j].Y, mPoints[j+1].X, mPoints[j+1].Y)
+			}
+			
+			pdf.SetFillColor(255, 0, 0)
+			drawArrow(pdf, mPoints[len(mPoints)-1], mPoints[len(mPoints)-2], size * 0.035)
+			
+			startP, nextP := mPoints[0], mPoints[1]
+			r := size * 0.025
+			dx, dy := nextP.X-startP.X, nextP.Y-startP.Y
+			dist := math.Sqrt(dx*dx + dy*dy)
+			ux, uy := -1.0, -1.0
+			if dist > 0.001 { ux, uy = dx/dist, dy/dist }
+			centerX, centerY := startP.X - ux*r, startP.Y - uy*r
+			
+			pdf.SetStrokeColor(255, 0, 0)
+			pdf.SetLineWidth(0.5)
+			pdf.Oval(centerX - r, centerY - r, centerX + r, centerY + r)
+			
+			if len(embeddedFont) > 0 {
+				numStr := strconv.Itoa(idx+1)
+				tw := fontSize * 0.6 * float64(len(numStr)) / 2
+				if len(numStr) > 1 { tw = fontSize * 0.5 }
+				pdf.SetFillColor(255, 0, 0)
+				pdf.SetXY(centerX - tw/2, centerY - fontSize/2)
+				_ = pdf.Cell(nil, numStr)
+			}
+		}
+	}
+}
+
+func drawGrid(pdf *gopdf.GoPdf, x, y, size float64) {
+	pdf.SetStrokeColor(220, 220, 220)
+	pdf.SetLineWidth(0.4)
+	pdf.RectFromUpperLeft(x, y, size, size)
+	mid := size / 2
+	drawDashedLine(pdf, x, y+mid, x+size, y+mid)
+	drawDashedLine(pdf, x+mid, y, x+mid, y+size)
+}
+
+func drawMiZiGe(pdf *gopdf.GoPdf, x, y, size float64) {
+	pdf.SetStrokeColor(220, 220, 220)
+	pdf.SetLineWidth(0.4)
+	pdf.RectFromUpperLeft(x, y, size, size)
+	mid := size / 2
+	drawDashedLine(pdf, x, y+mid, x+size, y+mid)
+	drawDashedLine(pdf, x+mid, y, x+mid, y+size)
+	drawDashedLine(pdf, x, y, x+size, y+size)
+	drawDashedLine(pdf, x, y+size, x+size, y)
+}
+
+func drawDashedLine(pdf *gopdf.GoPdf, x1, y1, x2, y2 float64) {
+	dashLen := 2.0
+	dx, dy := x2-x1, y2-y1
+	dist := math.Sqrt(dx*dx + dy*dy)
+	if dist < 0.001 { return }
+	ux, uy := dx/dist, dy/dist
+	for i := 0.0; i < dist; i += dashLen * 2 {
+		end := i + dashLen
+		if end > dist { end = dist }
+		pdf.Line(x1+ux*i, y1+uy*i, x1+ux*end, y1+uy*end)
+	}
+}
+
+func drawArrow(pdf *gopdf.GoPdf, target, prev gopdf.Point, length float64) {
+	angle := math.Atan2(target.Y-prev.Y, target.X-prev.X)
+	arrowAngle := math.Pi / 6
+	p1X := target.X + length*math.Cos(angle+math.Pi+arrowAngle)
+	p1Y := target.Y + length*math.Sin(angle+math.Pi+arrowAngle)
+	p2X := target.X + length*math.Cos(angle+math.Pi-arrowAngle)
+	p2Y := target.Y + length*math.Sin(angle+math.Pi-arrowAngle)
+	pdf.Polygon([]gopdf.Point{target, {X: p1X, Y: p1Y}, {X: p2X, Y: p2Y}}, "F")
+}
+
+func transformPoints(pts []Point, scale, ox, oy float64, flipY bool) []gopdf.Point {
+	res := make([]gopdf.Point, len(pts))
+	for i, p := range pts {
+		y := p[1]
+		if flipY { y = 1024 - y }
+		res[i] = gopdf.Point{X: ox + p[0]*scale, Y: oy + y*scale}
+	}
+	return res
+}
+
+var reSVG = regexp.MustCompile(`([MLQCZ])|(-?\d+\.?\d*)`)
+
+func parseSVGPath(path string, scale, ox, oy float64, flipY bool) []gopdf.Point {
+	var pts []gopdf.Point
+	matches := reSVG.FindAllStringSubmatch(path, -1)
+	
+	var lastX, lastY float64
+	
+	for idx := 0; idx < len(matches); {
+		item := matches[idx][0]
+		if item == "M" || item == "L" {
+			if idx+2 < len(matches) {
+				x, _ := strconv.ParseFloat(matches[idx+1][0], 64)
+				y, _ := strconv.ParseFloat(matches[idx+2][0], 64)
+				lastX, lastY = x, y
+				if flipY { y = 1024 - y }
+				pts = append(pts, gopdf.Point{X: ox + x*scale, Y: oy + y*scale})
+				idx += 3
+			} else { idx++ }
+		} else if item == "C" {
+			// Cubic Bezier: C x1 y1 x2 y2 x y
+			if idx+6 < len(matches) {
+				x1, _ := strconv.ParseFloat(matches[idx+1][0], 64)
+				y1, _ := strconv.ParseFloat(matches[idx+2][0], 64)
+				x2, _ := strconv.ParseFloat(matches[idx+3][0], 64)
+				y2, _ := strconv.ParseFloat(matches[idx+4][0], 64)
+				x, _ := strconv.ParseFloat(matches[idx+5][0], 64)
+				y, _ := strconv.ParseFloat(matches[idx+6][0], 64)
+				
+				// Sample points along the curve
+				for t := 0.2; t <= 1.0; t += 0.2 {
+					tx := math.Pow(1-t, 3)*lastX + 3*math.Pow(1-t, 2)*t*x1 + 3*(1-t)*math.Pow(t, 2)*x2 + math.Pow(t, 3)*x
+					ty := math.Pow(1-t, 3)*lastY + 3*math.Pow(1-t, 2)*t*y1 + 3*(1-t)*math.Pow(t, 2)*y2 + math.Pow(t, 3)*y
+					ty_final := ty
+					if flipY { ty_final = 1024 - ty }
+					pts = append(pts, gopdf.Point{X: ox + tx*scale, Y: oy + ty_final*scale})
+				}
+				lastX, lastY = x, y
+				idx += 7
+			} else { idx++ }
+		} else if item == "Q" {
+			// Quadratic Bezier: Q x1 y1 x y
+			if idx+4 < len(matches) {
+				x1, _ := strconv.ParseFloat(matches[idx+1][0], 64)
+				y1, _ := strconv.ParseFloat(matches[idx+2][0], 64)
+				x, _ := strconv.ParseFloat(matches[idx+3][0], 64)
+				y, _ := strconv.ParseFloat(matches[idx+4][0], 64)
+				
+				for t := 0.2; t <= 1.0; t += 0.2 {
+					tx := math.Pow(1-t, 2)*lastX + 2*(1-t)*t*x1 + math.Pow(t, 2)*x
+					ty := math.Pow(1-t, 2)*lastY + 2*(1-t)*t*y1 + math.Pow(t, 2)*y
+					ty_final := ty
+					if flipY { ty_final = 1024 - ty }
+					pts = append(pts, gopdf.Point{X: ox + tx*scale, Y: oy + ty_final*scale})
+				}
+				lastX, lastY = x, y
+				idx += 5
+			} else { idx++ }
+		} else if item == "Z" {
+			idx++
+		} else {
+			idx++
+		}
+	}
+	return pts
+}

pkg/jitie/logic/types.go

@@ -0,0 +1,9 @@
+package logic
+
+type HanziData struct {
+	Character string     `json:"character"`
+	Strokes   []string   `json:"strokes"`
+	Medians   [][]Point  `json:"medians"`
+}
+
+type Point [2]float64

pkg/jitie/tool.go

@@ -0,0 +1,93 @@
+package jitie
+
+import (
+	"embed"
+	"encoding/json"
+	"fmt"
+	"net/http"
+	"toolbox/pkg/base"
+	"toolbox/pkg/jitie/logic"
+
+	"github.com/gin-gonic/gin"
+)
+
+//go:embed data/all.json
+var allDataContent []byte
+
+//go:embed data/*.ttf
+var fontFS embed.FS
+
+type jitieTool struct {
+	allChars map[string]logic.HanziData
+}
+
+func init() {
+	base.Register(&jitieTool{})
+}
+
+func (t *jitieTool) ID() string          { return "jitie" }
+func (t *jitieTool) Name() string        { return "汉字字帖生成" }
+func (t *jitieTool) Description() string { return "基于本地 30MB 数据集生成的教学/步进式字帖" }
+
+func (t *jitieTool) Init() error {
+	fmt.Println("Loading 30MB character dataset...")
+	t.allChars = make(map[string]logic.HanziData)
+	if err := json.Unmarshal(allDataContent, &t.allChars); err != nil {
+		return fmt.Errorf("failed to unmarshal all.json: %v", err)
+	}
+	fmt.Printf("Loaded %d characters into memory\n", len(t.allChars))
+	
+	// Load font for logic layer
+	fontBytes, err := fontFS.ReadFile("data/font.ttf")
+	if err == nil && len(fontBytes) > 500 { // Check if it's a real font
+		logic.SetFontData(fontBytes)
+		fmt.Println("Font loaded for numbering")
+	} else {
+		fmt.Println("Warning: Could not load real font for numbering")
+	}
+	
+	return nil
+}
+
+func (t *jitieTool) RegisterRoutes(r *gin.RouterGroup) {
+	r.POST("/generate", t.handleGenerate)
+}
+
+type GenerateRequest struct {
+	Chars     string `json:"chars" binding:"required"`
+	Mode      string `json:"mode"`       // "teaching" or "step"
+	FlipY     bool   `json:"flip_y"`     
+	PaperSize string `json:"paper_size"` // "A4" or "Letter"
+}
+
+func (t *jitieTool) handleGenerate(c *gin.Context) {
+	var req GenerateRequest
+	if err := c.ShouldBindJSON(&req); err != nil {
+		c.JSON(http.StatusBadRequest, gin.H{"error": err.Error()})
+		return
+	}
+
+	var charsData []logic.HanziData
+	for _, char := range req.Chars {
+		charStr := string(char)
+		if data, ok := t.allChars[charStr]; ok {
+			data.Character = charStr // Ensure character field is set
+			charsData = append(charsData, data)
+		} else {
+			fmt.Printf("Warning: character %s not found in local dataset\n", charStr)
+		}
+	}
+
+	if len(charsData) == 0 {
+		c.JSON(http.StatusNotFound, gin.H{"error": "no valid character data found in local database"})
+		return
+	}
+
+	pdfBytes, err := logic.GeneratePDF(charsData, req.Mode, req.PaperSize, req.FlipY)
+	if err != nil {
+		c.JSON(http.StatusInternalServerError, gin.H{"error": err.Error()})
+		return
+	}
+
+	c.Data(http.StatusOK, "application/pdf", pdfBytes)
+}