books

assets/draw/p03/s12.dart

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+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();
+
+  final double strokeWidth = 0.5;
+  final Color color = Colors.blue;
+
+  @override
+  void paint(Canvas canvas, Size size) {
+    coordinate.paint(canvas, size);
+    canvas.translate(size.width / 2, size.height / 2);
+
+    // canvas.save();
+    var rect = Rect.fromCenter(center: Offset.zero,width: 200,height: 100);
+    canvas.clipRRect(RRect.fromRectAndRadius(rect, Radius.circular(30)));
+    canvas.drawColor(Colors.red, BlendMode.darken);
+  }
+
+  @override
+  bool shouldRepaint(CustomPainter oldDelegate) => false;
+}