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packages/idraw/lib/p01/p01.dart

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+export 'p01_page.dart';

packages/idraw/lib/p01/p01_page.dart

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+import 'package:flutter/material.dart';
+import 'package:flutter/src/gestures/events.dart';
+import 'package:idraw/components/demo_shower.dart';
+import 's01_page.dart' as s1;
+import 's02_page.dart' as s2;
+
+class P01Page extends StatelessWidget {
+  const P01Page({super.key});
+
+  @override
+  Widget build(BuildContext context) {
+    return const DemoShower(
+      demos: [
+        s1.Paper(),
+        s2.Paper(),
+      ],
+    );
+  }
+}

packages/idraw/lib/p01/s01_page.dart

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+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;
+}

packages/idraw/lib/p01/s02_page.dart

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+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();
+    paint
+      ..color = Colors.blue //颜色
+      ..strokeWidth = 4 //线宽
+      ..style = PaintingStyle.stroke; //模式--线型
+
+    //绘制线
+    canvas.drawLine(Offset(0, 0), Offset(100, 100), paint);
+
+    Path path = Path();
+    path.moveTo(100, 100);
+    path.lineTo(200, 0);
+    canvas.drawPath(path, paint..color = Colors.red);
+  }
+
+  void drawLine(Canvas canvas) {}
+
+  @override
+  bool shouldRepaint(CustomPainter oldDelegate) => false;
+}