feat: Add Learn-Number tool for preschool math practice and refactor HTML components

.gitignore

@@ -1,5 +1,5 @@
 # Binaries
-toolbox
+/toolbox
 *.exe
 *.exe~
 *.dll

cmd/toolbox/main.go

@@ -11,6 +11,7 @@ import (
 	"os"
 	"strconv"
 	"toolbox/pkg/base"
+	_ "toolbox/pkg/learnnumber"
 	_ "toolbox/pkg/zitie" // 匿名导入以触发 init()
 
 	"github.com/gin-gonic/gin"
@@ -55,8 +56,8 @@ func main() {
 	r.StaticFS("/static", http.FS(subFS))
 
 	// 3. 模板引擎初始化
-	// 关键修复：先 Sub 再 Parse，确保路径匹配
-	tmpl, err := template.ParseFS(subFS, "layout.html", "index.html")
+	// 递归加载 web 目录下所有的 .html 文件
+	tmpl, err := template.ParseFS(subFS, "layout.html", "index.html", "tools/*.html")
 	if err != nil {
 		log.Fatalf("Failed to parse templates: %v", err)
 	}

cmd/toolbox/web/index.html

@@ -1,51 +1,10 @@
 {{define "content"}}
-<!-- 汉字字帖面板 -->
-<div id="panel-zitie" class="tool-panel">
-    <header class="page-header">
-        <h1>汉字字帖生成器</h1>
-        <p>生成高颜值的硬笔/毛笔书法练习帖，支持 A4/Letter 高清矢量打印。</p>
-    </header>
 
-    <div class="tabs-container">
-        <div id="tab-teaching" class="tab-btn active" onclick="switchZitieTab('teaching')">2x3 教学方格</div>
-        <div id="tab-step" class="tab-btn" onclick="switchZitieTab('step')">步进式分解</div>
-        <div id="tab-manuscript" class="tab-btn" onclick="switchZitieTab('manuscript')">古风竖排</div>
-    </div>
+<!-- 注入各个工具面板 -->
+{{template "zitie" .}}
+{{template "learn_number" .}}
 
-    <div class="card">
-        <div style="display: flex; flex-direction: column; gap: 24px;">
-            <div class="input-group">
-                <label id="input-label">输入汉字内容 (2x3 教学方格模式下标点将被自动过滤)</label>
-                <textarea id="chars" placeholder="支持多行输入...">永和九年，岁在癸丑。</textarea>
-            </div>
-            
-            <div style="display: flex; gap: 20px; align-items: flex-end; flex-wrap: wrap;">
-                <div style="flex: 1; min-width: 200px;">
-                    <label style="font-size: 13px; font-weight: 600; color: #86868b; display: block; margin-bottom: 8px;">纸张大小</label>
-                    <select id="paper_size">
-                        <option value="A4">A4 (210x297mm)</option>
-                        <option value="Letter">Letter (8.5x11in)</option>
-                    </select>
-                </div>
-                <div id="font-select-group" style="flex: 1; min-width: 200px; display: none;">
-                    <label style="font-size: 13px; font-weight: 600; color: #86868b; display: block; margin-bottom: 8px;">书法字体</label>
-                    <select id="font_type">
-                        <option value="kaiti">华光楷体</option>
-                        <option value="xingshu">华光行草</option>
-                        <option value="lishu">华光隶变</option>
-                        <option value="songti">华光书宋</option>
-                    </select>
-                </div>
-                <button onclick="generatePDF()">生成高清预览</button>
-            </div>
-        </div>
-    </div>
-    <div id="pdf-preview-container" style="display:none; width: 100%; height: 850px; border-radius: 20px; overflow: hidden; box-shadow: 0 10px 40px rgba(0,0,0,0.1); background: #fff; border: 1px solid #d2d2d7;">
-        <iframe id="pdf-frame" style="width: 100%; height: 100%; border: none;"></iframe>
-    </div>
-</div>
-
-<!-- 默认欢迎面板 -->
+<!-- 欢迎面板 -->
 <div id="panel-welcome" class="tool-panel">
     <header class="page-header">
         <h1>欢迎使用个人工具箱</h1>
@@ -55,53 +14,67 @@
     <div style="margin-top: 40px; display: grid; grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); gap: 24px;">
         <div class="card" style="cursor:pointer; transition: transform 0.2s;" onmouseover="this.style.transform='translateY(-5px)'" onmouseout="this.style.transform='translateY(0)'" onclick="navigateTo('/zitie')">
             <h3 style="margin-top:0;">🖋️ 汉字字帖生成</h3>
-            <p style="color: #86868b; line-height: 1.5;">支持多种书法字体的 2x3 教学方格、步进分解和古风竖排信纸。专为硬笔和毛笔练习设计。</p>
+            <p style="color: #86868b; line-height: 1.5;">支持多种书法字体的 2x3 教学方格、步进分解和古风竖排信纸。</p>
+            <div style="color: var(--apple-blue); font-weight: 600; margin-top: 16px;">立即开始 →</div>
+        </div>
+        <div class="card" style="cursor:pointer; transition: transform 0.2s;" onmouseover="this.style.transform='translateY(-5px)'" onmouseout="this.style.transform='translateY(0)'" onclick="navigateTo('/learn-number')">
+            <h3 style="margin-top:0;">🔢 幼儿数学助手</h3>
+            <p style="color: #86868b; line-height: 1.5;">数图形、基础算术等趣味练习。培养孩子的数感与逻辑。</p>
             <div style="color: var(--apple-blue); font-weight: 600; margin-top: 16px;">立即开始 →</div>
         </div>
     </div>
 </div>
 
 <script>
-    let currentMode = 'teaching';
-
+    // --- Zitie Tool Logic ---
+    let currentZitieMode = 'teaching';
     function switchZitieTab(mode) {
-        currentMode = mode;
-        document.querySelectorAll('.tab-btn').forEach(btn => btn.classList.remove('active'));
+        currentZitieMode = mode;
+        document.querySelectorAll('#panel-zitie .tab-btn').forEach(btn => btn.classList.remove('active'));
         document.getElementById(`tab-${mode}`).classList.add('active');
         document.getElementById('font-select-group').style.display = (mode === 'manuscript') ? 'block' : 'none';
-        
-        const labels = {
-            'teaching': '输入汉字内容 (2x3 教学方格模式下标点将被自动过滤)',
-            'step': '输入汉字内容 (步进式分解模式下标点将被自动过滤)',
-            'manuscript': '输入汉字内容 (古风竖排支持换行，标点将被过滤)'
-        };
-        document.getElementById('input-label').innerText = labels[mode];
     }
 
-    async function generatePDF() {
+    async function generateZitiePDF() {
         const chars = document.getElementById('chars').value;
         const paper_size = document.getElementById('paper_size').value;
         const font_type = document.getElementById('font_type').value;
-        const btn = document.querySelector('button');
-        const originalText = btn.innerText;
-        btn.innerText = '正在绘图中...'; btn.disabled = true;
-        
+        const btn = document.querySelector('#panel-zitie button');
+        btn.innerText = '绘图中...'; btn.disabled = true;
         try {
-            const response = await fetch(`/api/zitie/${currentMode}`, {
+            const response = await fetch(`/api/zitie/${currentZitieMode}`, {
                 method: 'POST',
                 headers: { 'Content-Type': 'application/json' },
                 body: JSON.stringify({ chars, paper_size, font_type })
             });
             if (response.ok) {
                 const blob = await response.blob();
-                document.getElementById('pdf-preview-container').style.display = 'block';
-                document.getElementById('pdf-frame').src = URL.createObjectURL(blob);
-                if(window.innerWidth < 768) document.getElementById('pdf-preview-container').scrollIntoView({behavior: 'smooth'});
-            } else { alert('生成失败'); }
-        } catch (e) { alert('网络错误'); } finally { 
-            btn.innerText = originalText; 
-            btn.disabled = false; 
+                document.getElementById('zitie-preview').style.display = 'block';
+                document.getElementById('zitie-frame').src = URL.createObjectURL(blob);
             }
+        } catch (e) { alert('错误'); } finally { btn.innerText = '生成字帖预览'; btn.disabled = false; }
+    }
+
+    // --- Math Tool Logic ---
+    async function generateMathPDF() {
+        const total_count = parseInt(document.getElementById('total_count').value);
+        const icon_types = parseInt(document.getElementById('icon_types').value);
+        const paper_size = document.getElementById('math_paper_size').value;
+        const btn = document.querySelector('#panel-learn-number button');
+        btn.innerText = '生成中...'; btn.disabled = true;
+        try {
+            const response = await fetch('/api/learn-number/counting', {
+                method: 'POST',
+                headers: { 'Content-Type': 'application/json' },
+                body: JSON.stringify({ total_count, icon_types, paper_size })
+            });
+            if (response.ok) {
+                const blob = await response.blob();
+                document.getElementById('math-preview').style.display = 'block';
+                document.getElementById('math-frame').src = URL.createObjectURL(blob);
+                if(window.innerWidth < 768) document.getElementById('math-preview').scrollIntoView({behavior: 'smooth'});
+            }
+        } catch (e) { alert('错误'); } finally { btn.innerText = '生成数学练习帖'; btn.disabled = false; }
     }
 </script>
 {{end}}

cmd/toolbox/web/tools/learn_number.html

@@ -0,0 +1,38 @@
+{{define "learn_number"}}
+<div id="panel-learn-number" class="tool-panel">
+    <header class="page-header">
+        <h1>幼儿数学助手</h1>
+        <p>通过趣味图形和基础练习，培养孩子的数感与逻辑。</p>
+    </header>
+    <div class="tabs-container">
+        <div id="tab-counting" class="tab-btn active">数图形练习</div>
+    </div>
+    <div class="card">
+        <div style="display: flex; flex-direction: column; gap: 24px;">
+            <div style="display: flex; gap: 30px; flex-wrap: wrap;">
+                <div style="flex: 1; min-width: 250px;">
+                    <label style="font-size: 13px; font-weight: 600; color: #86868b; display: block; margin-bottom: 12px;">图标种类数 (1 - 5)</label>
+                    <input type="range" id="icon_types" min="1" max="5" value="3" style="width: 100%;" oninput="this.nextElementSibling.value = this.value">
+                    <output style="font-size: 18px; font-weight: 700; color: var(--apple-blue); margin-top: 10px; display: block;">3</output>
+                </div>
+                <div style="flex: 1; min-width: 250px;">
+                    <label style="font-size: 13px; font-weight: 600; color: #86868b; display: block; margin-bottom: 12px;">总图案数量 (种类数 - 30)</label>
+                    <input type="range" id="total_count" min="5" max="30" value="15" style="width: 100%;" oninput="this.nextElementSibling.value = this.value">
+                    <output style="font-size: 18px; font-weight: 700; color: var(--apple-blue); margin-top: 10px; display: block;">15</output>
+                </div>
+                <div style="width: 240px;">
+                    <label>纸张大小</label>
+                    <select id="math_paper_size">
+                        <option value="A4">A4</option>
+                        <option value="Letter">Letter</option>
+                    </select>
+                </div>
+            </div>
+            <button onclick="generateMathPDF()">生成数学练习帖</button>
+        </div>
+    </div>
+    <div id="math-preview" style="display:none; width: 100%; height: 800px; border-radius: 20px; overflow: hidden; box-shadow: 0 10px 40px rgba(0,0,0,0.1); background: #fff; border: 1px solid #d2d2d7;">
+        <iframe id="math-frame" style="width:100%; height:100%; border:none;"></iframe>
+    </div>
+</div>
+{{end}}

cmd/toolbox/web/tools/zitie.html

@@ -0,0 +1,43 @@
+{{define "zitie"}}
+<div id="panel-zitie" class="tool-panel">
+    <header class="page-header">
+        <h1>汉字字帖生成器</h1>
+        <p>生成高颜值的硬笔/毛笔书法练习帖。</p>
+    </header>
+    <div class="tabs-container">
+        <div id="tab-teaching" class="tab-btn active" onclick="switchZitieTab('teaching')">2x3 教学方格</div>
+        <div id="tab-step" class="tab-btn" onclick="switchZitieTab('step')">步进式分解</div>
+        <div id="tab-manuscript" class="tab-btn" onclick="switchZitieTab('manuscript')">古风竖排</div>
+    </div>
+    <div class="card">
+        <div style="display: flex; flex-direction: column; gap: 24px;">
+            <div class="input-group">
+                <label id="input-label">输入汉字内容</label>
+                <textarea id="chars" placeholder="支持多行输入...">永和九年，岁在癸丑。</textarea>
+            </div>
+            <div style="display: flex; gap: 20px; align-items: flex-end; flex-wrap: wrap;">
+                <div style="flex: 1; min-width: 200px;">
+                    <label>纸张大小</label>
+                    <select id="paper_size">
+                        <option value="A4">A4 (210x297mm)</option>
+                        <option value="Letter">Letter (8.5x11in)</option>
+                    </select>
+                </div>
+                <div id="font-select-group" style="flex: 1; min-width: 200px; display: none;">
+                    <label>书法字体</label>
+                    <select id="font_type">
+                        <option value="kaiti">华光楷体</option>
+                        <option value="xingshu">华光行草</option>
+                        <option value="lishu">华光隶变</option>
+                        <option value="songti">华光书宋</option>
+                    </select>
+                </div>
+                <button onclick="generateZitiePDF()">生成字帖预览</button>
+            </div>
+        </div>
+    </div>
+    <div id="zitie-preview" style="display:none; width: 100%; height: 800px; border-radius: 20px; overflow: hidden; box-shadow: 0 10px 40px rgba(0,0,0,0.1); background: #fff; border: 1px solid #d2d2d7;">
+        <iframe id="zitie-frame" style="width:100%; height:100%; border:none;"></iframe>
+    </div>
+</div>
+{{end}}

deploy/k8s.yaml

@@ -1,8 +1,13 @@
+apiVersion: v1
+kind: Namespace
+metadata:
+  name: toolbox
+---
 apiVersion: apps/v1
 kind: Deployment
 metadata:
   name: own-tools
-  namespace: default
+  namespace: toolbox
 spec:
   replicas: 1
   selector:
@@ -13,9 +18,6 @@ spec:
       labels:
         app: own-tools
     spec:
-      # 如果你的 Gitea 仓库是私有的，请取消下面注释并创建对应的 Secret
-      # imagePullSecrets:
-      # - name: gitea-registry-secret
       containers:
       - name: toolbox
         image: git.pengzhan.dev/haopengzhan/own-tools:latest
@@ -52,8 +54,8 @@ spec:
 apiVersion: v1
 kind: Service
 metadata:
-  name: own-tools
-  namespace: default
+  name: own-tools-service
+  namespace: toolbox
 spec:
   selector:
     app: own-tools
@@ -67,7 +69,7 @@ apiVersion: networking.k8s.io/v1
 kind: Ingress
 metadata:
   name: own-tools-ingress
-  namespace: default
+  namespace: toolbox
   annotations:
     cert-manager.io/cluster-issuer: letsencrypt-prod
 spec:
@@ -80,7 +82,7 @@ spec:
         pathType: Prefix
         backend:
           service:
-            name: own-tools
+            name: own-tools-service
             port:
               number: 80
   tls:

pkg/learnnumber/data/icons.go

@@ -0,0 +1,41 @@
+package data
+
+type Icon struct {
+	Name  string
+	Paths []string
+}
+
+// 升级版：更卡通、更饱满的简笔画
+var CountingIcons = []Icon{
+	{Name: "Bear", Paths: []string{
+		"M 512 800 C 300 800 200 700 200 500 C 200 300 350 200 512 200 C 674 200 824 300 824 500 C 824 700 724 800 512 800 Z", // Body
+		"M 300 300 m -50 0 a 50 50 0 1 0 100 0 a 50 50 0 1 0 -100 0", // Ear L
+		"M 724 300 m -50 0 a 50 50 0 1 0 100 0 a 50 50 0 1 0 -100 0", // Ear R
+		"M 400 450 m -20 0 a 20 20 0 1 0 40 0 a 20 20 0 1 0 -40 0",   // Eye L
+		"M 624 450 m -20 0 a 20 20 0 1 0 40 0 a 20 20 0 1 0 -40 0",   // Eye R
+		"M 512 550 Q 512 650 400 650 M 512 550 Q 512 650 624 650",    // Mouth
+	}},
+	{Name: "Cat", Paths: []string{
+		"M 200 800 L 300 400 L 400 200 L 512 350 L 624 200 L 724 400 L 824 800 Z", // Head
+		"M 400 550 m -15 0 a 15 15 0 1 0 30 0 a 15 15 0 1 0 -30 0", // Eye L
+		"M 624 550 m -15 0 a 15 15 0 1 0 30 0 a 15 15 0 1 0 -30 0", // Eye R
+		"M 512 650 L 450 700 M 512 650 L 574 700", // Nose
+	}},
+	{Name: "Car", Paths: []string{
+		"M 100 700 L 100 500 Q 100 400 300 400 L 700 400 Q 900 400 900 500 L 900 700 Z", // Body
+		"M 250 700 m -60 0 a 60 60 0 1 0 120 0 a 60 60 0 1 0 -120 0", // Wheel L
+		"M 750 700 m -60 0 a 60 60 0 1 0 120 0 a 60 60 0 1 0 -120 0", // Wheel R
+		"M 300 400 L 400 250 L 624 250 L 724 400", // Roof
+	}},
+	{Name: "Bird", Paths: []string{
+		"M 512 512 m -300 0 a 300 300 0 1 0 600 0 a 300 300 0 1 0 -600 0", // Body
+		"M 812 512 L 950 450 L 812 400 Z", // Beak
+		"M 400 400 m -20 0 a 20 20 0 1 0 40 0 a 20 20 0 1 0 -40 0", // Eye
+		"M 212 512 Q 100 400 212 300", // Wing
+	}},
+	{Name: "Rocket", Paths: []string{
+		"M 512 100 Q 700 400 700 800 L 324 800 Q 324 400 512 100 Z", // Body
+		"M 512 400 m -50 0 a 50 50 0 1 0 100 0 a 50 50 0 1 0 -100 0", // Window
+		"M 324 800 L 200 950 L 324 900 M 700 800 L 824 950 L 700 900", // Fins
+	}},
+}

pkg/learnnumber/logic/counting.go

@@ -0,0 +1,168 @@
+package logic
+
+import (
+	"bytes"
+	"math"
+	"math/rand"
+	"regexp"
+	"strconv"
+	"strings"
+	"time"
+	"toolbox/pkg/learnnumber/data"
+
+	"github.com/signintech/gopdf"
+)
+
+type CountingRequest struct {
+	TotalCount int    `json:"total_count"`
+	IconTypes  int    `json:"icon_types"`
+	PaperSize  string `json:"paper_size"`
+}
+
+var reSVG = regexp.MustCompile(`([MLQCZmlqcz])|(-?\d+\.?\d*)`)
+
+func GenerateCountingPDF(req CountingRequest) ([]byte, error) {
+	rand.Seed(time.Now().UnixNano())
+	pdf := &gopdf.GoPdf{}
+	rect := gopdf.Rect{W: 595.28, H: 841.89}
+	if req.PaperSize == "Letter" { rect = gopdf.Rect{W: 612, H: 792} }
+	pdf.Start(gopdf.Config{PageSize: rect})
+	pdf.AddPage()
+
+	drawProblem(pdf, req, 0, rect.W, rect.H/2)
+	drawProblem(pdf, req, rect.H/2, rect.W, rect.H/2)
+
+	var buf bytes.Buffer
+	_, err := pdf.WriteTo(&buf)
+	return buf.Bytes(), err
+}
+
+func drawProblem(pdf *gopdf.GoPdf, req CountingRequest, startY, pW, pH float64) {
+	margin := 40.0
+	boxW := (pW - 2*margin) * 0.7
+	boxH := pH - 60.0
+	x, y := margin, startY + 30.0
+
+	// 1. 绘制方框
+	pdf.SetStrokeColor(0, 0, 0); pdf.SetLineWidth(2.0)
+	pdf.RectFromUpperLeft(x, y, boxW, boxH)
+
+	// 2. 分配图标数量
+	numTypes := req.IconTypes; if numTypes < 1 { numTypes = 1 }
+	if numTypes > len(data.CountingIcons) { numTypes = len(data.CountingIcons) }
+	
+	total := req.TotalCount; if total < numTypes { total = numTypes }
+	if total > 30 { total = 30 }
+
+	// 随机选出图标种类
+	allIcons := rand.Perm(len(data.CountingIcons))
+	selectedIcons := []data.Icon{}
+	counts := []int{}
+	
+	// 先每种分配1个
+	rem := total - numTypes
+	for i := 0; i < numTypes; i++ {
+		selectedIcons = append(selectedIcons, data.CountingIcons[allIcons[i]])
+		counts = append(counts, 1)
+	}
+	// 随机分配剩下的
+	for i := 0; i < rem; i++ {
+		counts[rand.Intn(numTypes)]++
+	}
+
+	// 3. 布局计划 (使用网格，增加 Padding 避开边框)
+	rows, cols := 5, 6
+	cellW, cellH := boxW/float64(cols), boxH/float64(rows)
+	indices := rand.Perm(rows * cols)
+	
+	// 严格图标大小：单元格的 70%，确保不溢出单元格边界
+	iconSize := math.Min(cellW, cellH) * 0.7
+	paddingX, paddingY := (cellW - iconSize)/2, (cellH - iconSize)/2
+
+	iconTypeIdx := 0
+	countInCurrentType := 0
+	
+	for i := 0; i < total; i++ {
+		cellIdx := indices[i]
+		rIdx, cIdx := cellIdx/cols, cellIdx%cols
+		
+		// 基础位置
+		baseX := x + float64(cIdx)*cellW + paddingX
+		baseY := y + float64(rIdx)*cellH + paddingY
+		
+		// 渲染图标
+		drawIcon(pdf, selectedIcons[iconTypeIdx], baseX + iconSize/2, baseY + iconSize/2, iconSize)
+		
+		countInCurrentType++
+		if countInCurrentType >= counts[iconTypeIdx] {
+			iconTypeIdx++
+			countInCurrentType = 0
+		}
+	}
+
+	// 4. 绘制右侧对照表
+	legendX := x + boxW + 20.0
+	legendStepY := boxH / float64(numTypes + 1)
+	for i := 0; i < numTypes; i++ {
+		lY := y + float64(i+1)*legendStepY
+		drawIcon(pdf, selectedIcons[i], legendX + 20, lY, 30)
+		pdf.SetStrokeColor(150, 150, 150); pdf.SetLineWidth(0.8)
+		pdf.RectFromUpperLeft(legendX + 50, lY - 15, 30, 30)
+	}
+}
+
+func drawIcon(pdf *gopdf.GoPdf, icon data.Icon, cX, cY, size float64) {
+	scale := size / 1024.0
+	pdf.SetStrokeColor(0, 0, 0); pdf.SetLineWidth(1.5) // 加粗线条
+	
+	ox, oy := cX - size/2, cY - size/2
+	for _, pStr := range icon.Paths {
+		pts := parseSmoothPath(pStr, scale, ox, oy)
+		if len(pts) > 1 {
+			// 如果是闭合路径
+			if strings.Contains(strings.ToUpper(pStr), "Z") {
+				pdf.Polygon(pts, "D")
+			} else {
+				for i := 0; i < len(pts)-1; i++ {
+					pdf.Line(pts[i].X, pts[i].Y, pts[i+1].X, pts[i+1].Y)
+				}
+			}
+		}
+	}
+}
+
+// 支持贝塞尔曲线采样，确保图标圆润
+func parseSmoothPath(path string, scale, ox, oy float64) []gopdf.Point {
+	var pts []gopdf.Point
+	matches := reSVG.FindAllStringSubmatch(path, -1)
+	var lx, ly float64
+	for i := 0; i < len(matches); {
+		cmd := matches[i][0]
+		if cmd == "M" || cmd == "L" {
+			x, _ := strconv.ParseFloat(matches[i+1][0], 64); y, _ := strconv.ParseFloat(matches[i+2][0], 64)
+			lx, ly = x, y
+			pts = append(pts, gopdf.Point{X: ox + x*scale, Y: oy + y*scale})
+			i += 3
+		} else if cmd == "C" {
+			x1, _ := strconv.ParseFloat(matches[i+1][0], 64); y1, _ := strconv.ParseFloat(matches[i+2][0], 64)
+			x2, _ := strconv.ParseFloat(matches[i+3][0], 64); y2, _ := strconv.ParseFloat(matches[i+4][0], 64)
+			x, _ := strconv.ParseFloat(matches[i+5][0], 64); y, _ := strconv.ParseFloat(matches[i+6][0], 64)
+			for t := 0.25; t <= 1.0; t += 0.25 {
+				tx := math.Pow(1-t, 3)*lx + 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)*ly + 3*math.Pow(1-t, 2)*t*y1 + 3*(1-t)*math.Pow(t, 2)*y2 + math.Pow(t, 3)*y
+				pts = append(pts, gopdf.Point{X: ox + tx*scale, Y: oy + ty*scale})
+			}
+			lx, ly = x, y; i += 7
+		} else if cmd == "Q" {
+			x1, _ := strconv.ParseFloat(matches[i+1][0], 64); y1, _ := strconv.ParseFloat(matches[i+2][0], 64)
+			x, _ := strconv.ParseFloat(matches[i+3][0], 64); y, _ := strconv.ParseFloat(matches[i+4][0], 64)
+			for t := 0.25; t <= 1.0; t += 0.25 {
+				tx := math.Pow(1-t, 2)*lx + 2*(1-t)*t*x1 + math.Pow(t, 2)*x
+				ty := math.Pow(1-t, 2)*ly + 2*(1-t)*t*y1 + math.Pow(t, 2)*y
+				pts = append(pts, gopdf.Point{X: ox + tx*scale, Y: oy + ty*scale})
+			}
+			lx, ly = x, y; i += 5
+		} else { i++ }
+	}
+	return pts
+}

pkg/learnnumber/tool.go

@@ -0,0 +1,48 @@
+package learnnumber
+
+import (
+	"fmt"
+	"net/http"
+	"toolbox/pkg/base"
+	"toolbox/pkg/learnnumber/logic"
+
+	"github.com/gin-gonic/gin"
+)
+
+type learnNumberTool struct{}
+
+func init() {
+	base.Register(&learnNumberTool{})
+}
+
+func (t *learnNumberTool) ID() string          { return "learn-number" }
+func (t *learnNumberTool) Name() string        { return "幼儿数学助手" }
+func (t *learnNumberTool) Description() string { return "包含数图形、基础加减法等趣味数学练习" }
+
+func (t *learnNumberTool) Init() error {
+	fmt.Println("Initializing Learn-Number tool...")
+	return nil
+}
+
+func (t *learnNumberTool) RegisterRoutes(r *gin.RouterGroup) {
+	r.POST("/counting", t.handleCounting)
+}
+
+func (t *learnNumberTool) handleCounting(c *gin.Context) {
+	var req logic.CountingRequest
+	if err := c.ShouldBindJSON(&req); err != nil {
+		c.JSON(http.StatusBadRequest, gin.H{"error": err.Error()})
+		return
+	}
+
+	if req.TotalCount <= 0 { req.TotalCount = 20 }
+	if req.TotalCount > 30 { req.TotalCount = 30 }
+
+	pdfBytes, err := logic.GenerateCountingPDF(req)
+	if err != nil {
+		c.JSON(http.StatusInternalServerError, gin.H{"error": err.Error()})
+		return
+	}
+
+	c.Data(http.StatusOK, "application/pdf", pdfBytes)
+}