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packages/idraw/lib/p01/s01_page.dart

@@ -0,0 +1,29 @@
+import 'package:flutter/material.dart';
+
+
+class Paper extends StatelessWidget {
+  const Paper({super.key});
+
+  @override
+  Widget build(BuildContext context) {
+    return Container(
+      color: Colors.white,
+      child: CustomPaint( // 使用CustomPaint
+        painter: PaperPainter(),
+      ),
+    );
+  }
+}
+
+class PaperPainter extends CustomPainter {
+  @override
+  void paint(Canvas canvas, Size size) {
+    // 创建画笔
+    final Paint paint = Paint();
+    // 绘制圆
+    canvas.drawCircle(Offset(100, 100), 10, paint);
+  }
+
+  @override
+  bool shouldRepaint(CustomPainter oldDelegate) => false;
+}