89 lines
1.8 KiB
Dart
89 lines
1.8 KiB
Dart
|
|
import 'dart:ui';
|
|
|
|
import 'package:flutter/material.dart';
|
|
|
|
import '../components/coordinate.dart';
|
|
|
|
|
|
|
|
/// create by 张风捷特烈 on 2020/5/1
|
|
/// contact me by email 1981462002@qq.com
|
|
/// 说明:
|
|
|
|
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 Offset p1 = Offset(100, -100);
|
|
final Offset p2 = Offset(160, 50);
|
|
|
|
|
|
@override
|
|
void paint(Canvas canvas, Size size) {
|
|
coordinate.paint(canvas, size);
|
|
canvas.translate(size.width / 2, size.height / 2);
|
|
|
|
Path path = Path();
|
|
Paint paint = Paint()
|
|
..color = Colors.purpleAccent
|
|
..strokeWidth = 2
|
|
..style = PaintingStyle.stroke;
|
|
|
|
path.quadraticBezierTo(p1.dx, p1.dy, p2.dx, p2.dy);
|
|
_drawHelper(canvas);
|
|
|
|
path.relativeQuadraticBezierTo(p1.dx, p1.dy, p2.dx, p2.dy);
|
|
canvas.drawPath(path, paint);
|
|
|
|
}
|
|
|
|
void _drawHelper(Canvas canvas) {
|
|
canvas.drawPoints(
|
|
PointMode.polygon,
|
|
[
|
|
Offset.zero,
|
|
p1,
|
|
p2,
|
|
p1.translate(160, 50),
|
|
p2.translate(160, 50),
|
|
],
|
|
Paint()
|
|
..strokeWidth = 1
|
|
..strokeCap = StrokeCap.round
|
|
..color = Colors.blue);
|
|
canvas.drawPoints(
|
|
PointMode.points,
|
|
[
|
|
Offset.zero,
|
|
p1,
|
|
p2,
|
|
p1.translate(160, 50),
|
|
p2.translate(160, 50),
|
|
],
|
|
Paint()
|
|
..strokeWidth = 6
|
|
..strokeCap = StrokeCap.round
|
|
..color = Colors.blue);
|
|
}
|
|
|
|
@override
|
|
bool shouldRepaint(CustomPainter oldDelegate) => false;
|
|
}
|