books

assets/draw/p03/s10.dart

@@ -0,0 +1,68 @@
+import 'dart:math';
+import 'dart:typed_data';
+import 'dart:ui' as ui;
+
+import 'package:flutter/cupertino.dart';
+import 'package:flutter/material.dart';
+import 'package:flutter/services.dart';
+
+import '../components/coordinate.dart';
+
+/// create by 张风捷特烈 on 2020-03-19
+/// contact me by email 1981462002@qq.com
+/// 说明: 纸
+
+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();
+
+  late Paint _paint;
+
+  final double strokeWidth = 0.5;
+  final Color color = Colors.blue;
+
+  PaperPainter() {
+    _paint = Paint()
+      ..style = PaintingStyle.fill
+      ..strokeWidth = strokeWidth
+      ..color = color;
+  }
+
+  @override
+  void paint(Canvas canvas, Size size) {
+    coordinate.paint(canvas, size);
+    canvas.translate(size.width / 2, size.height / 2);
+
+    Path path = Path();
+    path.lineTo(60, 60);
+    path.lineTo(-60, 60);
+    path.lineTo(60, -60);
+    path.lineTo(-60, -60);
+    path.close();
+
+    canvas.drawPath(path, _paint);
+    canvas.translate(140, 0);
+    canvas.drawPath(
+        path,
+        _paint
+          ..style = PaintingStyle.stroke
+          ..strokeWidth = 2);
+  }
+
+  @override
+  bool shouldRepaint(CustomPainter oldDelegate) => false;
+}