Yin and yang: Difference between revisions

===Text===

===Flutter===

[[File:YinYang-flutter.png]]<br>

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<syntaxhighlight lang="dart">import 'dart:math';

import 'package:flutter/material.dart';

Path yinYang(double r, double x, double y, [double th = 1.0]) {

cR(double dY, double radius) => Rect.fromCircle(center: Offset(x, y + dY), radius: radius);

return Path()

..fillType = PathFillType.evenOdd

..addOval(cR(0, r + th))

..addOval(cR(r / 2, r / 6))

..addOval(cR(-r / 2, r / 6))

..addArc(cR(0, r), -pi / 2, -pi)

..addArc(cR(r / 2, r / 2), pi / 2, pi)

..addArc(cR(-r / 2, r / 2), pi / 2, -pi);

}

void main() => runApp(const MainApp());

class MainApp extends StatelessWidget {

const MainApp({super.key});

@override

Widget build(BuildContext context) => CustomPaint(painter: YinYangPainter());

}

class YinYangPainter extends CustomPainter {

@override

void paint(Canvas canvas, Size size) {

final fill = Paint()..style = PaintingStyle.fill;

canvas

..drawColor(Colors.white, BlendMode.src)

..drawPath(yinYang(50.0, 60, 60), fill)

..drawPath(yinYang(20.0, 140, 30), fill);

}

@override

bool shouldRepaint(CustomPainter oldDelegate) => true;

}

</syntaxhighlight>