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packages/idraw/lib/p02/s08.dart

@@ -0,0 +1,36 @@
+import 'package:flutter/cupertino.dart';
+import 'package:flutter/material.dart';
+import 'package:flutter/services.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  CustomPaint(
+      painter: PaperPainter(),
+    );
+  }
+}
+
+class PaperPainter extends CustomPainter {
+
+  @override
+  void paint(Canvas canvas, Size size) {
+    drawInvertColors(canvas);
+  }
+  void drawInvertColors(Canvas canvas) {
+    var paint = Paint();
+    paint..color = Color(0xff009A44);
+    canvas.drawCircle(Offset(100, 100), 50, paint..invertColors = false);
+    canvas.drawCircle(Offset(100+120.0, 100), 50, paint..invertColors = true);
+  }
+
+
+  @override
+  bool shouldRepaint(CustomPainter oldDelegate) => true;
+}