books

assets/draw/p01/s02.dart

@@ -0,0 +1,40 @@
+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;
+}