books

assets/draw/p05/s09.dart

@@ -0,0 +1,52 @@
+import 'dart:math';
+import 'dart:ui';
+
+import 'package:flutter/material.dart';
+
+import '../components/coordinate.dart';
+
+/// create by 张风捷特烈 on 2020/5/1
+/// contact me by email 1981462002@qq.com
+/// 说明:
+
+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 {
+  final Coordinate coordinate = Coordinate();
+
+  @override
+  void paint(Canvas canvas, Size size) {
+    coordinate.paint(canvas, size);
+    canvas.translate(size.width / 2, size.height / 2);
+
+    Path path = Path();
+    Paint paint = Paint()
+      ..color = Colors.purpleAccent
+      ..strokeWidth = 2
+      ..style = PaintingStyle.stroke;
+
+    Rect rect = Rect.fromPoints(Offset(100, 100), Offset(160, 140));
+    path
+      ..lineTo(100, 100)
+      ..addOval(rect)
+      ..relativeLineTo(100, -100)
+      ..addArc(rect.translate(100 + 60.0, -100), 0, pi);
+    canvas.drawPath(path, paint);
+  }
+
+  @override
+  bool shouldRepaint(CustomPainter oldDelegate) => false;
+}