69 lines
1.8 KiB
Dart
69 lines
1.8 KiB
Dart
import 'dart:ui';
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import 'package:flutter/material.dart';
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import '../components/coordinate_pro.dart';
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/// create by 张风捷特烈 on 2020/5/1
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/// contact me by email 1981462002@qq.com
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/// 说明:
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class Paper extends StatelessWidget {
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const Paper({super.key});
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@override
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Widget build(BuildContext context) {
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return Container(
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color: Colors.white,
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child: CustomPaint(
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// 使用CustomPaint
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painter: PaperPainter(),
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),
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);
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}
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}
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class PaperPainter extends CustomPainter {
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final Coordinate coordinate = Coordinate();
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Paint _helpPaint = Paint();
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double waveWidth = 80;
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double wrapHeight =100;
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double waveHeight = 40;
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@override
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void paint(Canvas canvas, Size size) {
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coordinate.paint(canvas, size);
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canvas.translate(size.width / 2, size.height / 2);
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Path path = Path();
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Paint paint = Paint()
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..color = Colors.orange
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..style = PaintingStyle.stroke
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..strokeWidth = 2;
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canvas.save();
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canvas.translate(-2*waveWidth, 0);
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path.moveTo(0, 0);
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path.relativeQuadraticBezierTo(waveWidth/2, -waveHeight*2, waveWidth, 0);
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path.relativeQuadraticBezierTo(waveWidth/2, waveHeight*2, waveWidth, 0);
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path.relativeQuadraticBezierTo(waveWidth/2, -waveHeight*2, waveWidth, 0);
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path.relativeQuadraticBezierTo(waveWidth/2, waveHeight*2, waveWidth, 0);
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path.close();
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canvas.drawPath(path, paint..style=PaintingStyle.fill);
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canvas.restore();
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_drawHelp(canvas);
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}
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void _drawHelp(Canvas canvas) {
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_helpPaint
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..color = Colors.purple
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..style = PaintingStyle.stroke
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..strokeCap = StrokeCap.round;
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canvas.drawRect(Rect.fromPoints(Offset(0,-100), Offset(160,100)), _helpPaint..strokeWidth=2);
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}
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@override
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bool shouldRepaint(CustomPainter oldDelegate) => false;
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} |