From ec5bc44741986c9a3fe702ea7c662e62695bd0e0 Mon Sep 17 00:00:00 2001
From: R524809 <R524809@hyundai-hmatc.com>
Date: Tue, 14 Apr 2026 17:34:05 +0800
Subject: [PATCH] =?UTF-8?q?feat:=20=E8=8B=B1=E8=AF=AD=E5=AD=97=E6=AF=8D?=
 =?UTF-8?q?=E6=8F=8F=E7=BA=A2=E4=BF=AE=E6=94=B9?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

---
 miniprogram/core/data/worksheets.ts           |  38 ++-
 miniprogram/core/draw/baseDraw.ts             |   2 +-
 miniprogram/core/draw/drawHeader.ts           |   2 +-
 .../generators/letter-tracing-generator.ts    | 172 ----------
 .../letterTracing/letterTracing.ts            |  86 +++--
 .../letterTracing/letterTracing.wxml          |   6 +-
 .../letterTracing/字母描红产品文档.md         |  23 ++
 .../englishPages/shared/assets/letter/A.png   | Bin 0 -> 19594 bytes
 .../englishPages/shared/assets/letter/B.png   | Bin 0 -> 16871 bytes
 .../shared/draw/letterTracingDraw.ts          | 299 +++++++++++-------
 .../generators/letter-tracing-generator.ts    | 260 +++++++++++++++
 11 files changed, 546 insertions(+), 342 deletions(-)
 delete mode 100644 miniprogram/core/generators/letter-tracing-generator.ts
 create mode 100644 miniprogram/englishPages/letterTracing/字母描红产品文档.md
 create mode 100644 miniprogram/englishPages/shared/assets/letter/A.png
 create mode 100644 miniprogram/englishPages/shared/assets/letter/B.png
 create mode 100644 miniprogram/englishPages/shared/generators/letter-tracing-generator.ts

diff --git a/miniprogram/core/data/worksheets.ts b/miniprogram/core/data/worksheets.ts
index d267823..ca014b4 100644
--- a/miniprogram/core/data/worksheets.ts
+++ b/miniprogram/core/data/worksheets.ts
@@ -258,8 +258,8 @@ export const ALL_WORKSHEETS: WorksheetDefinition[] = [
     sheet(
         {
             id: 'letter-tracing-single',
-            title: '字母学习页',
-            desc: '单字母配图、阅读句与四线三格描红',
+            title: '看图描红',
+            desc: '单字母配图、例句与六行四线三格描红',
             category: 'english',
             page: 'letterTracing',
             subpackage: 'englishPages',
@@ -280,7 +280,7 @@ export const ALL_WORKSHEETS: WorksheetDefinition[] = [
                 instructionText: '看一看，读一读，再描一描',
             },
             generatorConfig: {
-                mode: 'single-letter',
+                mode: 'picture-tracing',
                 letterCase: 'upper',
                 selectedLetter: 'A',
                 repetitions: 5,
@@ -291,8 +291,8 @@ export const ALL_WORKSHEETS: WorksheetDefinition[] = [
     sheet(
         {
             id: 'letter-tracing-full',
-            title: '26 字母描红',
-            desc: '整页四线三格逐字母描红',
+            title: '分栏对照',
+            desc: '半组字母左大写右小写，每行四个',
             category: 'english',
             page: 'letterTracing',
             subpackage: 'englishPages',
@@ -308,11 +308,15 @@ export const ALL_WORKSHEETS: WorksheetDefinition[] = [
             template: 'tracing-writing',
             generator: 'letter-tracing',
             sortOrder: 43,
-            layoutConfig: { ...L.trace, instructionText: '沿虚线描写字母' },
+            layoutConfig: {
+                ...L.trace,
+                instructionText: '左栏大写、右栏小写，逐行对应描红',
+            },
             generatorConfig: {
-                mode: 'full-alphabet',
-                letterCase: 'upper',
-                repetitions: 8,
+                mode: 'column-compare',
+                letterCase: 'both',
+                alphabetHalf: 'A-M',
+                repetitions: 4,
                 fadePattern: 'gradient',
             },
         },
@@ -320,8 +324,8 @@ export const ALL_WORKSHEETS: WorksheetDefinition[] = [
     sheet(
         {
             id: 'letter-tracing-upper-lower',
-            title: '大小写字母对照',
-            desc: '上半部大写、下半部小写总览',
+            title: '字母总览',
+            desc: 'Uppercase / Lowercase 分区，9+9+8 行',
             category: 'english',
             page: 'letterTracing',
             subpackage: 'englishPages',
@@ -340,10 +344,10 @@ export const ALL_WORKSHEETS: WorksheetDefinition[] = [
             layoutConfig: {
                 ...L.trace,
                 columns: 13,
-                instructionText: '认识大写和小写字母',
+                instructionText: '认读全部大写与小写字母',
             },
             generatorConfig: {
-                mode: 'upper-lower-split',
+                mode: 'overview',
                 letterCase: 'both',
                 repetitions: 1,
                 fadePattern: 'first-only',
@@ -353,8 +357,8 @@ export const ALL_WORKSHEETS: WorksheetDefinition[] = [
     sheet(
         {
             id: 'letter-tracing-two-column',
-            title: '字母描红（两列）',
-            desc: 'A–M / N–Z 两列练习',
+            title: '大小写配对',
+            desc: '左 A–M、右 N–Z，每行四组大小写',
             category: 'english',
             page: 'letterTracing',
             subpackage: 'englishPages',
@@ -376,8 +380,8 @@ export const ALL_WORKSHEETS: WorksheetDefinition[] = [
                 instructionText: '沿虚线描写字母',
             },
             generatorConfig: {
-                mode: 'two-column',
-                letterCase: 'upper',
+                mode: 'case-pairing',
+                letterCase: 'both',
                 repetitions: 4,
                 fadePattern: 'gradient',
             },
diff --git a/miniprogram/core/draw/baseDraw.ts b/miniprogram/core/draw/baseDraw.ts
index 7fbff1e..296725b 100644
--- a/miniprogram/core/draw/baseDraw.ts
+++ b/miniprogram/core/draw/baseDraw.ts
@@ -14,7 +14,7 @@ import drawHeader from './drawHeader';
  * - 打印配置管理
  */
 const LINE_COLOR = 'rgba(50, 46, 37, 0.4)';
-const LINE_WIDTH = 3;
+const LINE_WIDTH = 2;
 
 export class BaseDrawService {
     canvas: WechatMiniprogram.Canvas;
diff --git a/miniprogram/core/draw/drawHeader.ts b/miniprogram/core/draw/drawHeader.ts
index 0d6f01e..00a92b7 100644
--- a/miniprogram/core/draw/drawHeader.ts
+++ b/miniprogram/core/draw/drawHeader.ts
@@ -24,7 +24,7 @@ const META_FONT_PX = 12;
 const META_UNDERLINE_GAP = 3;
 const TITLE_COLOR = '#322E25';
 const LINE_COLOR = 'rgba(50, 46, 37, 0.4)';
-const LINE_WIDTH = 3;
+const LINE_WIDTH = 2;
 const META_COLOR = '#7C766A';
 const META_ROW_MARGIN_X = 130;
 
diff --git a/miniprogram/core/generators/letter-tracing-generator.ts b/miniprogram/core/generators/letter-tracing-generator.ts
deleted file mode 100644
index 4e73039..0000000
--- a/miniprogram/core/generators/letter-tracing-generator.ts
+++ /dev/null
@@ -1,172 +0,0 @@
-import {
-    ALPHABET_BY_LETTER,
-    LETTERS_UPPER,
-} from '../data/alphabet';
-
-export type LetterTracingMode =
-    | 'single-letter'
-    | 'full-alphabet'
-    | 'upper-lower-split'
-    | 'two-column';
-
-export type LetterCaseMode = 'upper' | 'lower' | 'both';
-
-export interface LetterTracingGeneratorConfig {
-    mode: LetterTracingMode;
-    letterCase: LetterCaseMode;
-    selectedLetter?: string;
-    repetitions: number;
-    fadePattern: 'gradient' | 'first-only';
-}
-
-export interface TracingCell {
-    char: string;
-    opacity: number;
-    isGuide: boolean;
-}
-
-export interface TracingRow {
-    displayChar: string;
-    cells: TracingCell[];
-}
-
-export interface TeachingBlock {
-    upper: string;
-    lower: string;
-    word: string;
-    sentence: string;
-    emoji: string;
-}
-
-export type LetterTracingData =
-    | {
-          mode: 'single-letter';
-          teaching: TeachingBlock;
-          rows: TracingRow[];
-      }
-    | {
-          mode: 'full-alphabet';
-          rows: TracingRow[];
-      }
-    | {
-          mode: 'upper-lower-split';
-          upperGlyphs: string[];
-          lowerGlyphs: string[];
-      }
-    | {
-          mode: 'two-column';
-          leftRows: TracingRow[];
-          rightRows: TracingRow[];
-      };
-
-function normalizeLetter(c: string): string {
-    const u = c.trim().toUpperCase();
-    return u.length ? u[0] : 'A';
-}
-
-function buildCells(
-    char: string,
-    count: number,
-    fadePattern: 'gradient' | 'first-only',
-): TracingCell[] {
-    const n = Math.max(1, Math.min(12, count));
-    const cells: TracingCell[] = [];
-    for (let i = 0; i < n; i++) {
-        let opacity: number;
-        if (fadePattern === 'first-only') {
-            opacity = i === 0 ? 1 : 0;
-        } else if (n <= 1) {
-            opacity = 1;
-        } else {
-            opacity = Math.max(0.12, 1 - i / (n - 1));
-        }
-        cells.push({ char, opacity, isGuide: i === 0 });
-    }
-    return cells;
-}
-
-function rowForChar(
-    ch: string,
-    repetitions: number,
-    fadePattern: 'gradient' | 'first-only',
-): TracingRow {
-    return {
-        displayChar: ch,
-        cells: buildCells(ch, repetitions, fadePattern),
-    };
-}
-
-export function generateLetterTracing(
-    config: LetterTracingGeneratorConfig,
-): LetterTracingData {
-    const { mode, letterCase, repetitions, fadePattern } = config;
-
-    if (mode === 'single-letter') {
-        const key = normalizeLetter(config.selectedLetter ?? 'A');
-        const meta = ALPHABET_BY_LETTER[key] ?? ALPHABET_BY_LETTER.A;
-        const upper = key;
-        const lower = key.toLowerCase();
-        const teaching: TeachingBlock = {
-            upper,
-            lower,
-            word: meta.word,
-            sentence: `${upper} is for ${meta.word}`,
-            emoji: meta.emoji,
-        };
-        const rows: TracingRow[] = [
-            rowForChar(upper, repetitions, fadePattern),
-            rowForChar(lower, repetitions, fadePattern),
-        ];
-        return { mode: 'single-letter', teaching, rows };
-    }
-
-    if (mode === 'full-alphabet') {
-        const rows = LETTERS_UPPER.map((L) => {
-            const ch = letterCase === 'lower' ? L.toLowerCase() : L;
-            return rowForChar(ch, repetitions, fadePattern);
-        });
-        return { mode: 'full-alphabet', rows };
-    }
-
-    if (mode === 'upper-lower-split') {
-        return {
-            mode: 'upper-lower-split',
-            upperGlyphs: [...LETTERS_UPPER],
-            lowerGlyphs: LETTERS_UPPER.map((L) => L.toLowerCase()),
-        };
-    }
-
-    // two-column
-    const left = LETTERS_UPPER.slice(0, 13);
-    const right = LETTERS_UPPER.slice(13);
-    const mapChar = (L: string) =>
-        letterCase === 'lower' ? L.toLowerCase() : L;
-    const leftRows = left.map((L) =>
-        rowForChar(mapChar(L), repetitions, fadePattern),
-    );
-    const rightRows = right.map((L) =>
-        rowForChar(mapChar(L), repetitions, fadePattern),
-    );
-    return { mode: 'two-column', leftRows, rightRows };
-}
-
-/** 与 WorksheetDefinition.generatorConfig 合并后的运行时配置 */
-export function mergeLetterTracingConfig(
-    base: Partial<LetterTracingGeneratorConfig>,
-    overrides: Partial<LetterTracingGeneratorConfig>,
-): LetterTracingGeneratorConfig {
-    return {
-        mode: (overrides.mode ?? base.mode ?? 'single-letter') as LetterTracingMode,
-        letterCase: (overrides.letterCase ??
-            base.letterCase ??
-            'upper') as LetterCaseMode,
-        selectedLetter: overrides.selectedLetter ?? base.selectedLetter,
-        repetitions: Math.max(
-            1,
-            (overrides.repetitions ?? base.repetitions ?? 5) as number,
-        ),
-        fadePattern: (overrides.fadePattern ??
-            base.fadePattern ??
-            'gradient') as 'gradient' | 'first-only',
-    };
-}
diff --git a/miniprogram/englishPages/letterTracing/letterTracing.ts b/miniprogram/englishPages/letterTracing/letterTracing.ts
index 2cafadc..dbf286d 100644
--- a/miniprogram/englishPages/letterTracing/letterTracing.ts
+++ b/miniprogram/englishPages/letterTracing/letterTracing.ts
@@ -5,39 +5,43 @@ import { getWorksheetById } from '../../core/data/worksheets';
 import {
     generateLetterTracing,
     mergeLetterTracingConfig,
+    normalizeLetter,
     type LetterTracingGeneratorConfig,
     type LetterTracingMode,
-} from '../../core/generators/letter-tracing-generator';
+} from '../shared/generators/letter-tracing-generator';
 import { LETTERS_UPPER } from '../../core/data/alphabet';
 
+/** 各 worksheetId 对应的页面标题和描述 */
 const PAGE_META: Record<string, { title: string; desc: string }> = {
     'letter-tracing-single': {
-        title: '字母学习页',
-        desc: '单字母配图与描红',
+        title: '看图描红',
+        desc: '配图、例句与六行描红',
     },
     'letter-tracing-full': {
-        title: '26 字母描红',
-        desc: '整页字母书写练习',
+        title: '分栏对照',
+        desc: '半组字母左大写右小写',
     },
     'letter-tracing-upper-lower': {
-        title: '大小写字母对照',
-        desc: '一页认识 A-Z 与 a-z',
+        title: '字母总览',
+        desc: 'Uppercase / Lowercase 总览',
     },
     'letter-tracing-two-column': {
-        title: '字母描红（两列）',
-        desc: 'A–M / N–Z 两列练习',
+        title: '大小写配对',
+        desc: '左 A–M、右 N–Z 配对描红',
     },
 };
 
+/** 根据 worksheetId 查找页面元信息 */
 function pageInfoLookup(id: string) {
     return PAGE_META[id];
 }
 
+/** 模式选择器的选项列表 */
 const MODE_OPTIONS = [
-    { id: 'letter-tracing-single', label: '单字母学习页' },
-    { id: 'letter-tracing-full', label: '整页描红' },
-    { id: 'letter-tracing-upper-lower', label: '大小写对照' },
-    { id: 'letter-tracing-two-column', label: '两列描红' },
+    { id: 'letter-tracing-single', label: '看图描红' },
+    { id: 'letter-tracing-full', label: '分栏对照' },
+    { id: 'letter-tracing-upper-lower', label: '字母总览' },
+    { id: 'letter-tracing-two-column', label: '大小写配对' },
 ] as const;
 
 type PageData = CanvasDataState & {
@@ -66,7 +70,7 @@ createPage(
             hasContent: false,
             showShareDialog: false,
             worksheetId: 'letter-tracing-single',
-            traceMode: 'single-letter',
+            traceMode: 'picture-tracing',
             selectedLetter: 'A',
             letterCaseLower: false,
             showLetterPicker: true,
@@ -76,6 +80,7 @@ createPage(
             modeOptions: [...MODE_OPTIONS],
         } as unknown as PageData,
 
+        /** 页面加载：从路由参数获取 worksheetId 并应用 */
         onLoad(options: { id?: string }) {
             const worksheetId =
                 options.id && PAGE_META[options.id]
@@ -84,6 +89,7 @@ createPage(
             this.applyWorksheet(worksheetId);
         },
 
+        /** 用户点击模式选择器时切换 worksheet */
         onSelectMode(e: WechatMiniprogram.TouchEvent) {
             const id = e.currentTarget.dataset.id as string | undefined;
             if (!id || id === this.data.worksheetId) return;
@@ -93,6 +99,7 @@ createPage(
             });
         },
 
+        /** 页面就绪：初始化 Canvas 和绘制服务，完成后触发首次绘制 */
         onReady() {
             this.initCanvas({
                 createDrawService: (
@@ -102,7 +109,6 @@ createPage(
                 ) => new LetterTracingDraw(canvas, ctx, options),
                 drawServiceOptions: {
                     title: this.data.pageTitle,
-                    subTitle: this.data.subTitle || '',
                 },
                 onCanvasReady: () => {
                     this.drawCanvas();
@@ -110,12 +116,13 @@ createPage(
             });
         },
 
+        /** 构建运行时生成器配置：合并 worksheet 预设 + 当前页面状态 */
         buildRuntimeConfig(): LetterTracingGeneratorConfig {
             const def = getWorksheetById(this.data.worksheetId);
             const base = (def?.generatorConfig ??
                 {}) as Partial<LetterTracingGeneratorConfig>;
             const letterCase =
-                this.data.traceMode === 'single-letter'
+                this.data.traceMode === 'picture-tracing'
                     ? (base.letterCase ?? 'upper')
                     : this.data.letterCaseLower
                       ? 'lower'
@@ -123,14 +130,23 @@ createPage(
             return mergeLetterTracingConfig(base, {
                 selectedLetter: this.data.selectedLetter,
                 letterCase,
+                ...(this.data.traceMode === 'column-compare'
+                    ? {
+                          alphabetHalf: this.data.letterCaseLower
+                              ? 'N-Z'
+                              : 'A-M',
+                      }
+                    : {}),
             });
         },
 
+        /** 执行 Canvas 绘制：生成数据 → 调用 drawService 渲染 */
         async drawCanvas() {
             if (!this.ctx || !this.drawService) return;
             try {
                 const config = this.buildRuntimeConfig();
                 const data = generateLetterTracing(config);
+                console.log('drawCanvas data', data);
                 await (this.drawService as LetterTracingDraw).draw(data);
                 this.setData({ hasContent: true });
             } catch (e) {
@@ -139,6 +155,7 @@ createPage(
             }
         },
 
+        /** 用户在字母网格中选择了一个字母 */
         onSelectLetter(e: WechatMiniprogram.TouchEvent) {
             const letter = e.currentTarget.dataset.letter as string;
             if (!letter) return;
@@ -146,16 +163,19 @@ createPage(
             this.drawCanvas();
         },
 
+        /** 切换为大写模式并重绘 */
         onSelectCaseUpper() {
             this.setData({ letterCaseLower: false });
             this.drawCanvas();
         },
 
+        /** 切换为小写模式并重绘 */
         onSelectCaseLower() {
             this.setData({ letterCaseLower: true });
             this.drawCanvas();
         },
 
+        /** 跳到下一个字母（循环 A→Z→A）并重绘 */
         onNextLetter() {
             const list = LETTERS_UPPER;
             const i = list.indexOf(this.data.selectedLetter);
@@ -164,6 +184,13 @@ createPage(
             this.drawCanvas();
         },
 
+        /**
+         * 应用指定的 worksheet 配置到页面状态
+         * 根据 worksheet 的 generatorConfig 决定 UI 控件的显隐（字母选择器、大小写切换等）
+         * @param worksheetId - 要应用的 worksheet ID
+         * @param options.preserveLetter - 是否保留当前选中的字母（模式切换时使用）
+         * @param options.redraw - 是否立即重绘 Canvas
+         */
         applyWorksheet(
             worksheetId: string,
             options?: {
@@ -172,22 +199,24 @@ createPage(
             },
         ) {
             const def = getWorksheetById(worksheetId);
+            console.log('def', def);
             const base = (def?.generatorConfig ??
                 {}) as Partial<LetterTracingGeneratorConfig>;
             const merged = mergeLetterTracingConfig(base, {});
 
             const traceMode = merged.mode;
-            const showLetterPicker = traceMode === 'single-letter';
-            const showCaseToggle =
-                traceMode === 'full-alphabet' || traceMode === 'two-column';
-            const showNextLetter = traceMode === 'single-letter';
+            const showLetterPicker = traceMode === 'picture-tracing';
+            const showCaseToggle = traceMode === 'column-compare';
+            const showNextLetter = traceMode === 'picture-tracing';
             const selectedLetter = options?.preserveLetter
-                ? this.data.selectedLetter
-                : normalizePick(merged.selectedLetter);
+                ? (this.data.selectedLetter ?? 'A')
+                : normalizeLetter(merged.selectedLetter ?? '');
             const letterCaseLower =
-                traceMode === 'single-letter'
-                    ? merged.letterCase === 'lower'
-                    : this.data.letterCaseLower;
+                traceMode === 'column-compare'
+                    ? merged.alphabetHalf === 'N-Z'
+                    : traceMode === 'picture-tracing'
+                      ? merged.letterCase === 'lower'
+                      : false;
 
             this.setData(
                 {
@@ -208,8 +237,6 @@ createPage(
 
                     if (this.drawService) {
                         this.drawService.options.title = this.data.pageTitle;
-                        this.drawService.options.subTitle =
-                            this.data.subTitle || '';
                     }
 
                     if (options?.redraw) {
@@ -224,8 +251,3 @@ createPage(
         pageInfoLookup,
     },
 );
-
-function normalizePick(c?: string): string {
-    if (!c || c.length === 0) return 'A';
-    return c.trim().toUpperCase().charAt(0);
-}
diff --git a/miniprogram/englishPages/letterTracing/letterTracing.wxml b/miniprogram/englishPages/letterTracing/letterTracing.wxml
index e2454ab..6c98f38 100644
--- a/miniprogram/englishPages/letterTracing/letterTracing.wxml
+++ b/miniprogram/englishPages/letterTracing/letterTracing.wxml
@@ -53,7 +53,7 @@
             </view>
 
             <view wx:if="{{showCaseToggle}}" class="param-block">
-                <text class="lt-field-label">大小写</text>
+                <text class="lt-field-label">半组字母</text>
                 <view class="lt-chip-row">
                     <view
                         class="lt-chip {{!letterCaseLower ? 'lt-chip--active' : ''}}"
@@ -61,7 +61,7 @@
                         hover-start-time="0"
                         hover-stay-time="70"
                         bind:tap="onSelectCaseUpper">
-                        大写 A–Z
+                        A–M
                     </view>
                     <view
                         class="lt-chip {{letterCaseLower ? 'lt-chip--active' : ''}}"
@@ -69,7 +69,7 @@
                         hover-start-time="0"
                         hover-stay-time="70"
                         bind:tap="onSelectCaseLower">
-                        小写 a–z
+                        N–Z
                     </view>
                 </view>
             </view>
diff --git a/miniprogram/englishPages/letterTracing/字母描红产品文档.md b/miniprogram/englishPages/letterTracing/字母描红产品文档.md
new file mode 100644
index 0000000..8756557
--- /dev/null
+++ b/miniprogram/englishPages/letterTracing/字母描红产品文档.md
@@ -0,0 +1,23 @@
+## 练习类型
+
+1. 大小写配对 — 26 字母双栏，每组大写+小写并排
+2. 分栏对照 — 半组字母，左栏大写右栏小写
+3. 字母总览 — 上下分区展示全部大小写
+4. 看图描红 — 单字母教学配图 + 描红练习
+
+### 类型描述
+
+1. 一页展示 26 个字母，每个包含大小写，分左右两栏，左栏A-M，右栏N-Z，每栏的一行展示 4 组字母，每一组都是一个大写和小写字母的组合。同一行是相同的字母
+2. 一页展示 A-M 或N-Z的字母，分左右两栏，左栏每行展示 4 个大小字母，右栏展示 4 个对应的小写字母。同一行是相同的字母
+3. 一页分上下两块区域展示，上面展示大写字母，下面展示小写字母，上面是Uppercase Letters 标题加三行，前面两行展示 9 个字母，最后一行展示剩余的 8 个字母。下面区域title是 lowercase Letters，行的展示逻辑和上面一致
+4. 一页分为上下两部分，上部分有分左右两部分，左边展示超大字体的大小写字母，下面展示一段方面记忆的短句，例如：“L is for Lion”,上部分右边展示对应的Lion 的图片。下部分展示 6 行字母描红，前三行大写，后三行小写。
+
+## 生成要求
+
+字母行统一使用 四线三格，颜色为偏黑色，其中最上边和最下边的线条为实线，中间的两个线条为虚线。
+
+## 字母书写顺序资料
+
+https://zhuanlan.zhihu.com/p/107632161
+
+https://www.ld4.net/26zimu.html
diff --git a/miniprogram/englishPages/shared/assets/letter/A.png b/miniprogram/englishPages/shared/assets/letter/A.png
new file mode 100644
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literal 0
HcmV?d00001

diff --git a/miniprogram/englishPages/shared/draw/letterTracingDraw.ts b/miniprogram/englishPages/shared/draw/letterTracingDraw.ts
index e5353e0..2da623a 100644
--- a/miniprogram/englishPages/shared/draw/letterTracingDraw.ts
+++ b/miniprogram/englishPages/shared/draw/letterTracingDraw.ts
@@ -2,14 +2,15 @@ import { BaseDrawService } from '../../../core/draw/baseDraw';
 import type {
     LetterTracingData,
     TracingRow,
-} from '../../../core/generators/letter-tracing-generator';
+} from '../generators/letter-tracing-generator';
 
 const M = 24;
-const BLUE = '#4A90E2';
-const ORANGE = '#FF8C42';
+/** 四线三格线色：偏黑，实线与虚线统一色相，仅以线型区分 */
+const LINE_INK = '#2a2a2a';
 
 /**
- * 字母描红绘制（tracing-writing + letter-tracing 的客户端实现）
+ * 字母描红绘制
+ * 四线三格：顶线、上中线、下中线为格内三线间距；最上最下为实线，中间两虚线（产品文档）
  */
 export default class LetterTracingDraw extends BaseDrawService {
     constructor(
@@ -25,53 +26,65 @@ export default class LetterTracingDraw extends BaseDrawService {
         await this.drawHeaderAndDivider();
 
         switch (data.mode) {
-            case 'single-letter':
-                this.drawSingleLetter(data);
+            case 'picture-tracing':
+                this.drawPictureTracing(data);
+                this.drawPrintFooter();
                 break;
-            case 'full-alphabet':
-                this.drawFullAlphabet(data.rows);
+            case 'case-pairing':
+                this.drawCasePairing(data.leftVisualRows, data.rightVisualRows);
+                this.drawPrintFooter();
                 break;
-            case 'upper-lower-split':
-                this.drawUpperLowerSplit(data.upperGlyphs, data.lowerGlyphs);
+            case 'column-compare':
+                this.drawColumnCompare(data.leftRows, data.rightRows);
+                this.drawPrintFooter();
                 break;
-            case 'two-column':
-                this.drawTwoColumn(data.leftRows, data.rightRows);
+            case 'overview':
+                this.drawOverview(data.upperRows, data.lowerRows);
+                this.drawPrintFooter();
                 break;
         }
     }
 
-    /** 四线三格：顶线、中虚线、基线、底线 */
+    /**
+     * 四线三格：y 顶 → y+h 底，中间两条虚线
+     */
     private drawFourLines(x: number, y: number, w: number, h: number) {
         const ctx = this.ctx;
         const yTop = y;
-        const yMid = y + h * 0.28;
-        const yBase = y + h * 0.62;
+        const yMid1 = y + h * 0.28;
+        const yMid2 = y + h * 0.58;
         const yBot = y + h;
 
-        ctx.strokeStyle = BLUE;
-        ctx.lineWidth = 1;
-        ctx.setLineDash([]);
+        const strokeSolid = () => {
+            ctx.strokeStyle = LINE_INK;
+            ctx.lineWidth = 1;
+            ctx.setLineDash([]);
+        };
+        const strokeDash = () => {
+            ctx.strokeStyle = LINE_INK;
+            ctx.lineWidth = 1;
+            ctx.setLineDash([5, 5]);
+        };
+
+        strokeSolid();
         ctx.beginPath();
         ctx.moveTo(x, yTop);
         ctx.lineTo(x + w, yTop);
         ctx.stroke();
 
-        ctx.strokeStyle = ORANGE;
-        ctx.setLineDash([6, 6]);
+        strokeDash();
         ctx.beginPath();
-        ctx.moveTo(x, yMid);
-        ctx.lineTo(x + w, yMid);
+        ctx.moveTo(x, yMid1);
+        ctx.lineTo(x + w, yMid1);
         ctx.stroke();
 
-        ctx.strokeStyle = BLUE;
+        ctx.beginPath();
+        ctx.moveTo(x, yMid2);
+        ctx.lineTo(x + w, yMid2);
+        ctx.stroke();
+
+        strokeSolid();
         ctx.setLineDash([]);
-        ctx.lineWidth = 1.2;
-        ctx.beginPath();
-        ctx.moveTo(x, yBase);
-        ctx.lineTo(x + w, yBase);
-        ctx.stroke();
-
-        ctx.lineWidth = 1;
         ctx.beginPath();
         ctx.moveTo(x, yBot);
         ctx.lineTo(x + w, yBot);
@@ -86,18 +99,30 @@ export default class LetterTracingDraw extends BaseDrawService {
         h: number,
         opacity: number,
         bold: boolean,
+        pairChar?: string,
     ) {
         const ctx = this.ctx;
         if (opacity <= 0) return;
-        const fontSize = Math.min(h * 0.72, w * 0.85);
         ctx.save();
         ctx.globalAlpha = opacity;
-        ctx.fillStyle = bold ? '#111' : '#666';
-        ctx.font = `${bold ? 'bold ' : ''}${fontSize}px sans-serif`;
+        ctx.fillStyle = bold ? '#1a1a1a' : '#4a4a4a';
         ctx.textAlign = 'center';
         ctx.textBaseline = 'alphabetic';
-        const baselineY = y + h * 0.62;
-        ctx.fillText(ch, x + w / 2, baselineY);
+        const baselineY = y + h * 0.72;
+
+        if (pairChar) {
+            const fs = Math.min(h * 0.5, w * 0.22);
+            ctx.font = `${bold ? 'bold ' : ''}${fs}px sans-serif`;
+            const gap = fs * 0.2;
+            const totalW = fs * 2 + gap;
+            const x0 = x + w / 2 - totalW / 2;
+            ctx.fillText(ch, x0 + fs * 0.5, baselineY);
+            ctx.fillText(pairChar, x0 + fs * 1.5 + gap, baselineY);
+        } else {
+            const fontSize = Math.min(h * 0.72, w * 0.85);
+            ctx.font = `${bold ? 'bold ' : ''}${fontSize}px sans-serif`;
+            ctx.fillText(ch, x + w / 2, baselineY);
+        }
         ctx.restore();
     }
 
@@ -110,7 +135,7 @@ export default class LetterTracingDraw extends BaseDrawService {
     ) {
         const gap = 4;
         const n = row.cells.length;
-        const cellW = (totalWidth - gap * (n - 1)) / n;
+        const cellW = n > 0 ? (totalWidth - gap * (n - 1)) / n : totalWidth;
 
         for (let i = 0; i < n; i++) {
             const cx = startX + i * (cellW + gap);
@@ -124,140 +149,182 @@ export default class LetterTracingDraw extends BaseDrawService {
                 rowH,
                 cell.opacity,
                 cell.isGuide,
+                cell.pairChar,
             );
         }
     }
 
-    private drawSingleLetter(
-        data: Extract<LetterTracingData, { mode: 'single-letter' }>,
+    /**
+     * 看图描红：上左超大字母+例句，上右「配图」大 emoji；下 6 行四线三格
+     */
+    private drawPictureTracing(
+        data: Extract<LetterTracingData, { mode: 'picture-tracing' }>,
     ) {
         const ctx = this.ctx;
         const { teaching, rows } = data;
         const cw = this.canvasWidth;
         let y = this.currentY + 8;
-        const teachH = Math.min(220, (this.canvasHeight - y) * 0.42);
+        const teachH = Math.min(240, (this.canvasHeight - y) * 0.38);
+        const innerW = cw - M * 2;
+        const splitX = M + innerW * 0.52;
 
-        // 教学区背景
         ctx.fillStyle = '#f8fafc';
-        ctx.fillRect(M, y, cw - M * 2, teachH);
+        ctx.fillRect(M, y, innerW, teachH);
 
-        // 左侧 emoji
-        ctx.font = `${Math.min(88, teachH * 0.45)}px sans-serif`;
-        ctx.textAlign = 'center';
-        ctx.textBaseline = 'middle';
-        ctx.fillText(teaching.emoji, M + (cw - M * 2) * 0.22, y + teachH / 2);
-
-        // 右侧文字
-        const tx = M + (cw - M * 2) * 0.42;
+        // 左侧：大小写 + 例句（短句在字母下方）
+        const leftPad = M + 20;
         ctx.textAlign = 'left';
         ctx.textBaseline = 'top';
         ctx.fillStyle = '#111';
-        ctx.font = 'bold 44px sans-serif';
-        ctx.fillText(`${teaching.upper}  ${teaching.lower}`, tx, y + 16);
-        ctx.font = '22px sans-serif';
+        const bigFs = Math.min(56, teachH * 0.26);
+        ctx.font = `bold ${bigFs}px sans-serif`;
+        ctx.fillText(
+            `${teaching.upper}  ${teaching.lower}`,
+            leftPad,
+            y + teachH * 0.12,
+        );
+        ctx.font = `${Math.min(22, teachH * 0.1)}px sans-serif`;
         ctx.fillStyle = '#333';
-        ctx.fillText(teaching.sentence, tx, y + 72);
-        ctx.fillStyle = '#666';
-        ctx.font = '18px sans-serif';
-        ctx.fillText(teaching.word, tx, y + 104);
+        ctx.fillText(teaching.sentence, leftPad, y + teachH * 0.48);
+
+        // 右侧：配图区（以 emoji 作为插图占位）
+        ctx.font = `${Math.min(120, teachH * 0.55)}px sans-serif`;
+        ctx.textAlign = 'center';
+        ctx.textBaseline = 'middle';
+        ctx.fillText(
+            teaching.emoji,
+            splitX + (cw - M - splitX) / 2,
+            y + teachH / 2,
+        );
 
         y += teachH + 12;
         this.drawDashedDivider(y, M, '#ccc');
         y += 14;
 
         const rest = this.canvasHeight - y - M;
-        const rowH = Math.max(36, (rest - 8) / rows.length);
-        const rowWidth = cw - M * 2;
+        const rowH = Math.max(34, (rest - 10) / rows.length);
+        const rowWidth = innerW;
         for (let r = 0; r < rows.length; r++) {
             this.drawTracingRow(
                 rows[r],
                 M,
-                y + r * (rowH + 10),
+                y + r * (rowH + 8),
                 rowH,
                 rowWidth,
             );
         }
     }
 
-    private drawFullAlphabet(rows: TracingRow[]) {
+    /**
+     * 大小写配对：左右两栏，每行最多 4 组子行并排
+     */
+    private drawCasePairing(
+        leftVisualRows: TracingRow[][],
+        rightVisualRows: TracingRow[][],
+    ) {
         const y0 = this.currentY + 6;
         const bottom = this.canvasHeight - M;
-        const totalH = bottom - y0;
-        const rowH = Math.max(14, totalH / rows.length - 2);
-        const rowWidth = this.canvasWidth - M * 2;
+        const gapCol = 18;
+        const colW = (this.canvasWidth - M * 2 - gapCol) / 2;
+        const maxVisual = Math.max(
+            leftVisualRows.length,
+            rightVisualRows.length,
+        );
+        const rowSlotH = Math.max(40, (bottom - y0) / maxVisual - 6);
 
-        for (let i = 0; i < rows.length; i++) {
-            const y = y0 + i * (rowH + 2);
-            this.drawTracingRow(rows[i], M, y, rowH, rowWidth);
-        }
-    }
-
-    private drawUpperLowerSplit(upper: string[], lower: string[]) {
-        const ctx = this.ctx;
-        const cw = this.canvasWidth;
-        let y = this.currentY + 6;
-        const innerW = cw - M * 2;
-
-        const drawBlockTitle = (t: string) => {
-            ctx.fillStyle = '#111';
-            ctx.font = 'bold 18px sans-serif';
-            ctx.textAlign = 'left';
-            ctx.textBaseline = 'top';
-            ctx.fillText(t, M, y);
-            y += 26;
-        };
-
-        const drawGlyphGrid = (chars: string[], cols: number) => {
-            const rows = Math.ceil(chars.length / cols);
-            const cellW = (innerW - (cols - 1) * 4) / cols;
-            const cellH = 32;
-
-            for (let r = 0; r < rows; r++) {
-                for (let c = 0; c < cols; c++) {
-                    const idx = r * cols + c;
-                    if (idx >= chars.length) break;
-                    const cx = M + c * (cellW + 4);
-                    this.drawFourLines(cx, y, cellW, cellH);
-                    this.drawCharInCell(
-                        chars[idx],
-                        cx,
+        const drawSide = (
+            blocks: TracingRow[][],
+            startX: number,
+            width: number,
+        ) => {
+            let y = y0;
+            for (const visualRow of blocks) {
+                const nSeg = visualRow.length;
+                const segGap = 6;
+                const segW = (width - (nSeg - 1) * segGap) / nSeg;
+                for (let s = 0; s < nSeg; s++) {
+                    this.drawTracingRow(
+                        visualRow[s],
+                        startX + s * (segW + segGap),
                         y,
-                        cellW,
-                        cellH,
-                        0.85,
-                        true,
+                        rowSlotH,
+                        segW,
                     );
                 }
-                y += cellH + 6;
+                y += rowSlotH + 8;
             }
         };
 
-        drawBlockTitle('大写字母 Uppercase');
-        drawGlyphGrid(upper, 13);
-        y += 8;
-        this.drawDashedDivider(y, M, '#bbb');
-        y += 14;
-        drawBlockTitle('小写字母 Lowercase');
-        drawGlyphGrid(lower, 13);
+        drawSide(leftVisualRows, M, colW);
+        drawSide(rightVisualRows, M + colW + gapCol, colW);
     }
 
-    private drawTwoColumn(leftRows: TracingRow[], rightRows: TracingRow[]) {
+    /** 分栏对照：左大写、右小写，逐行对齐 */
+    private drawColumnCompare(leftRows: TracingRow[], rightRows: TracingRow[]) {
         const y0 = this.currentY + 6;
         const bottom = this.canvasHeight - M;
-        const totalH = bottom - y0;
-        const maxRows = Math.max(leftRows.length, rightRows.length);
-        const rowH = Math.max(16, totalH / maxRows - 3);
+        const maxR = Math.max(leftRows.length, rightRows.length);
+        const rowH = Math.max(36, (bottom - y0) / maxR - 6);
         const gapCol = 16;
         const colW = (this.canvasWidth - M * 2 - gapCol) / 2;
 
         for (let i = 0; i < leftRows.length; i++) {
-            const y = y0 + i * (rowH + 3);
+            const y = y0 + i * (rowH + 6);
             this.drawTracingRow(leftRows[i], M, y, rowH, colW);
         }
         const xR = M + colW + gapCol;
         for (let i = 0; i < rightRows.length; i++) {
-            const y = y0 + i * (rowH + 3);
+            const y = y0 + i * (rowH + 6);
             this.drawTracingRow(rightRows[i], xR, y, rowH, colW);
         }
     }
+
+    /**
+     * 字母总览：Uppercase Letters / lowercase Letters，各行 9+9+8，四线三格
+     */
+    private drawOverview(upperRows: string[][], lowerRows: string[][]) {
+        const ctx = this.ctx;
+        let y = this.currentY + 6;
+        const innerW = this.canvasWidth - M * 2;
+
+        const title = (t: string) => {
+            ctx.fillStyle = '#111';
+            ctx.font = 'bold 17px sans-serif';
+            ctx.textAlign = 'left';
+            ctx.textBaseline = 'top';
+            ctx.fillText(t, M, y);
+            y += 24;
+        };
+
+        const drawBand = (rows: string[][]) => {
+            for (const line of rows) {
+                const n = line.length;
+                const gap = 4;
+                const cellW = (innerW - (n - 1) * gap) / n;
+                const cellH = 30;
+                for (let i = 0; i < n; i++) {
+                    const cx = M + i * (cellW + gap);
+                    this.drawFourLines(cx, y, cellW, cellH);
+                    this.drawCharInCell(
+                        line[i],
+                        cx,
+                        y,
+                        cellW,
+                        cellH,
+                        0.9,
+                        true,
+                    );
+                }
+                y += cellH + 8;
+            }
+        };
+
+        title('Uppercase Letters');
+        drawBand(upperRows);
+        y += 6;
+        this.drawDashedDivider(y, M, '#bbb');
+        y += 12;
+        title('lowercase Letters');
+        drawBand(lowerRows);
+    }
 }
diff --git a/miniprogram/englishPages/shared/generators/letter-tracing-generator.ts b/miniprogram/englishPages/shared/generators/letter-tracing-generator.ts
new file mode 100644
index 0000000..53d80ee
--- /dev/null
+++ b/miniprogram/englishPages/shared/generators/letter-tracing-generator.ts
@@ -0,0 +1,260 @@
+import { ALPHABET_BY_LETTER, LETTERS_UPPER } from '../../../core/data/alphabet';
+
+/** 字母描红的布局模式（与产品文档四类练习一致） */
+export type LetterTracingMode =
+    /** 4 看图描红：教学区 + 6 行描红（前三行大写、后三行小写） */
+    | 'picture-tracing'
+    /** 1 大小写配对：左栏 A–M、右栏 N–Z，每行最多 4 组 Aa */
+    | 'case-pairing'
+    /** 2 分栏对照：半组字母，左栏大写、右栏小写，每行 4 个 */
+    | 'column-compare'
+    /** 3 字母总览：Uppercase / Lowercase 分区，每区 9+9+8 */
+    | 'overview';
+
+/** 字母大小写模式（部分模式不使用） */
+export type LetterCaseMode = 'upper' | 'lower' | 'both';
+
+/** A–M / N–Z 半表（分栏对照） */
+export type AlphabetHalf = 'A-M' | 'N-Z';
+
+/** 字母描红生成器的配置项 */
+export interface LetterTracingGeneratorConfig {
+    mode: LetterTracingMode;
+    letterCase: LetterCaseMode;
+    selectedLetter?: string;
+    repetitions: number;
+    fadePattern: 'gradient' | 'first-only';
+    /** 分栏对照：练习 A–M 或 N–Z */
+    alphabetHalf?: AlphabetHalf;
+}
+
+/** 单个描红格子的数据 */
+export interface TracingCell {
+    char: string;
+    opacity: number;
+    isGuide: boolean;
+    /** 与 char 组成大小写一对（如 A + a），用于大小写配对格内展示 */
+    pairChar?: string;
+}
+
+/** 一行描红数据，包含展示字符和若干格子 */
+export interface TracingRow {
+    displayChar: string;
+    cells: TracingCell[];
+}
+
+/** 看图描红教学区 */
+export interface TeachingBlock {
+    upper: string;
+    lower: string;
+    word: string;
+    sentence: string;
+    emoji: string;
+}
+
+export type LetterTracingData =
+    | {
+          mode: 'picture-tracing';
+          teaching: TeachingBlock;
+          rows: TracingRow[];
+      }
+    | {
+          mode: 'case-pairing';
+          leftVisualRows: TracingRow[][];
+          rightVisualRows: TracingRow[][];
+      }
+    | {
+          mode: 'column-compare';
+          leftRows: TracingRow[];
+          rightRows: TracingRow[];
+      }
+    | {
+          mode: 'overview';
+          upperRows: string[][];
+          lowerRows: string[][];
+      };
+
+/** 将用户输入的字母标准化为大写单字符，默认 'A' */
+export function normalizeLetter(c: string): string {
+    const u = c.trim().toUpperCase();
+    return u.length ? u[0] : 'A';
+}
+
+function buildCells(
+    char: string,
+    count: number,
+    fadePattern: 'gradient' | 'first-only',
+    pairChar?: string,
+): TracingCell[] {
+    const n = Math.max(1, Math.min(12, count));
+    const cells: TracingCell[] = [];
+    for (let i = 0; i < n; i++) {
+        let opacity: number;
+        if (fadePattern === 'first-only') {
+            opacity = i === 0 ? 1 : 0;
+        } else if (n <= 1) {
+            opacity = 1;
+        } else {
+            opacity = Math.max(0.12, 1 - i / (n - 1));
+        }
+        cells.push({
+            char,
+            opacity,
+            isGuide: i === 0,
+            ...(pairChar !== undefined ? { pairChar } : {}),
+        });
+    }
+    return cells;
+}
+
+function rowForChar(
+    ch: string,
+    repetitions: number,
+    fadePattern: 'gradient' | 'first-only',
+    pairChar?: string,
+): TracingRow {
+    return {
+        displayChar: ch,
+        cells: buildCells(ch, repetitions, fadePattern, pairChar),
+    };
+}
+
+/** 一行内多个字母，各自占一段描红格（用于分栏对照等） */
+function rowForManyChars(
+    chars: string[],
+    repetitions: number,
+    fadePattern: 'gradient' | 'first-only',
+): TracingRow {
+    const cells: TracingCell[] = [];
+    for (const ch of chars) {
+        cells.push(...buildCells(ch, repetitions, fadePattern));
+    }
+    return {
+        displayChar: chars.join(''),
+        cells,
+    };
+}
+
+function chunk<T>(arr: T[], size: number): T[][] {
+    const out: T[][] = [];
+    for (let i = 0; i < arr.length; i += size) {
+        out.push(arr.slice(i, i + size));
+    }
+    return out;
+}
+
+/** 总览区 26 字母拆成 9 + 9 + 8 三行 */
+function overviewRowsFrom(letters: string[]): string[][] {
+    return [letters.slice(0, 9), letters.slice(9, 18), letters.slice(18, 26)];
+}
+
+/**
+ * 根据配置生成字母描红数据
+ * - picture-tracing：教学区 + 6 行描红
+ * - case-pairing：左 A–M / 右 N–Z，每行最多 4 组大小写配对
+ * - column-compare：半表，左大写右小写，每行 4 个
+ * - overview：Uppercase / Lowercase Letters，9+9+8
+ */
+export function generateLetterTracing(
+    config: LetterTracingGeneratorConfig,
+): LetterTracingData {
+    const { mode, repetitions, fadePattern } = config;
+
+    if (mode === 'picture-tracing') {
+        const key = normalizeLetter(config.selectedLetter ?? 'A');
+        const meta = ALPHABET_BY_LETTER[key] ?? ALPHABET_BY_LETTER.A;
+        const upper = key;
+        const lower = key.toLowerCase();
+        const teaching: TeachingBlock = {
+            upper,
+            lower,
+            word: meta.word,
+            sentence: `${upper} is for ${meta.word}`,
+            emoji: meta.emoji,
+        };
+        const rows: TracingRow[] = [
+            rowForChar(upper, repetitions, fadePattern),
+            rowForChar(upper, repetitions, fadePattern),
+            rowForChar(upper, repetitions, fadePattern),
+            rowForChar(lower, repetitions, fadePattern),
+            rowForChar(lower, repetitions, fadePattern),
+            rowForChar(lower, repetitions, fadePattern),
+        ];
+        return { mode: 'picture-tracing', teaching, rows };
+    }
+
+    if (mode === 'case-pairing') {
+        const leftLetters = LETTERS_UPPER.slice(0, 13);
+        const rightLetters = LETTERS_UPPER.slice(13);
+        const pack = (letters: string[]) =>
+            chunk(letters, 4).map((group) =>
+                group.map((L) =>
+                    rowForChar(
+                        L,
+                        repetitions,
+                        fadePattern,
+                        L.toLowerCase(),
+                    ),
+                ),
+            );
+        return {
+            mode: 'case-pairing',
+            leftVisualRows: pack(leftLetters),
+            rightVisualRows: pack(rightLetters),
+        };
+    }
+
+    if (mode === 'column-compare') {
+        const half =
+            config.alphabetHalf === 'N-Z'
+                ? LETTERS_UPPER.slice(13)
+                : LETTERS_UPPER.slice(0, 13);
+        const rowsOf4 = chunk(half, 4);
+        const leftRows = rowsOf4.map((g) =>
+            rowForManyChars(g, repetitions, fadePattern),
+        );
+        const rightRows = rowsOf4.map((g) =>
+            rowForManyChars(
+                g.map((L) => L.toLowerCase()),
+                repetitions,
+                fadePattern,
+            ),
+        );
+        return { mode: 'column-compare', leftRows, rightRows };
+    }
+
+    // overview
+    return {
+        mode: 'overview',
+        upperRows: overviewRowsFrom([...LETTERS_UPPER]),
+        lowerRows: overviewRowsFrom(
+            LETTERS_UPPER.map((L) => L.toLowerCase()),
+        ),
+    };
+}
+
+/** 与 WorksheetDefinition.generatorConfig 合并后的运行时配置 */
+export function mergeLetterTracingConfig(
+    base: Partial<LetterTracingGeneratorConfig>,
+    overrides: Partial<LetterTracingGeneratorConfig>,
+): LetterTracingGeneratorConfig {
+    return {
+        mode: (overrides.mode ??
+            base.mode ??
+            'picture-tracing') as LetterTracingMode,
+        letterCase: (overrides.letterCase ??
+            base.letterCase ??
+            'upper') as LetterCaseMode,
+        selectedLetter: overrides.selectedLetter ?? base.selectedLetter,
+        repetitions: Math.max(
+            1,
+            (overrides.repetitions ?? base.repetitions ?? 5) as number,
+        ),
+        fadePattern: (overrides.fadePattern ??
+            base.fadePattern ??
+            'gradient') as 'gradient' | 'first-only',
+        alphabetHalf: (overrides.alphabetHalf ??
+            base.alphabetHalf ??
+            'A-M') as AlphabetHalf,
+    };
+}