books

assets/draw/p09/s03.dart

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+import 'dart:async';
+import 'dart:math';
+import 'dart:ui' as ui;
+import 'package:flutter/material.dart';
+import 'package:flutter/services.dart';
+
+import '../components/coordinate_pro.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(
+      size: Size(100,100),
+      painter: PicMan(), // 背景
+    );
+  }
+
+}
+
+class PicMan extends CustomPainter {
+  @override
+  void paint(Canvas canvas, Size size) {
+    canvas.clipRect(Offset.zero & size); //剪切画布
+    canvas.translate(size.width/2, size.height/2);
+    _drawArcDetail(canvas);
+  }
+
+  void _drawArcDetail(Canvas canvas) {
+    var rect = Rect.fromCenter(center: Offset(0, 0), height: 100, width: 100);
+    Paint _paint = Paint();
+
+
+    var a = pi / 8;
+    canvas.drawArc(rect, a, 2 * pi - a.abs() * 2, true, _paint..color=Colors.yellowAccent);
+    canvas.translate(40, 0);
+
+    canvas.translate(40, 0);
+    canvas.drawCircle(Offset(0, 0), 6, _paint);
+    canvas.translate(25, 0);
+    canvas.drawCircle(Offset(0, 0), 6, _paint);
+
+  }
+
+  @override
+  bool shouldRepaint(covariant CustomPainter oldDelegate) => false;
+}