feat: 开发英语启蒙的入口页

miniprogram/englishPages/letterTracing/draw/letterTracingDraw.ts

@@ -0,0 +1,28 @@
+import { BaseDrawService } from '../../../core/draw/baseDraw';
+import type { LetterTracingData } from '../generators/letter-tracing-generator';
+import singleLetterDraw from './singleLetterDraw';
+import CasePairingDraw from './casePairingDraw';
+import TwoColumnDraw from './twoColumnDraw';
+import UpperLowerDraw from './upperLowerDraw';
+import SingleLineDraw from './singleLineDraw';
+import TripleDraw from './tripleDraw';
+
+/**
+ * 字母描红绘制分发层。
+ * 根据 data.mode 委托给对应的独立 DrawService 完成实际绘制。
+ */
+export default class LetterTracingDraw extends BaseDrawService {
+    async draw(data: LetterTracingData) {
+        const DrawClass = {
+            'letter-tracing-single': singleLetterDraw,
+            'letter-tracing-upper-lower': UpperLowerDraw,
+            'letter-tracing-case-pairing': CasePairingDraw,
+            'letter-tracing-two-column': TwoColumnDraw,
+            'letter-tracing-half': SingleLineDraw,
+            'letter-tracing-three': TripleDraw,
+        }[data.mode];
+
+        const delegate = new DrawClass(this.canvas, this.ctx, this.options);
+        await delegate.draw(data as any);
+    }
+}