75 lines
1.5 KiB
Dart
75 lines
1.5 KiB
Dart
import 'dart:math';
|
|
import 'dart:typed_data';
|
|
import 'dart:ui' as ui;
|
|
|
|
|
|
import 'package:flutter/cupertino.dart';
|
|
import 'package:flutter/material.dart';
|
|
import 'package:flutter/services.dart';
|
|
|
|
import '../components/coordinate.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 Container(
|
|
color: Colors.white,
|
|
child: CustomPaint(
|
|
// 使用CustomPaint
|
|
painter: PaperPainter(),
|
|
),
|
|
);
|
|
}
|
|
}
|
|
|
|
class PaperPainter extends CustomPainter {
|
|
final Coordinate coordinate = Coordinate();
|
|
|
|
late Paint _paint;
|
|
|
|
final double strokeWidth = 0.5;
|
|
final Color color = Colors.blue;
|
|
|
|
PaperPainter() {
|
|
_paint = Paint()
|
|
..style = PaintingStyle.fill
|
|
..strokeWidth = strokeWidth
|
|
..color = color;
|
|
}
|
|
|
|
@override
|
|
void paint(Canvas canvas, Size size) {
|
|
coordinate.paint(canvas, size);
|
|
|
|
var colors = [
|
|
Color(0xFFF60C0C),
|
|
Color(0xFFF3B913),
|
|
Color(0xFFE7F716),
|
|
Color(0xFF3DF30B),
|
|
Color(0xFF0DF6EF),
|
|
Color(0xFF0829FB),
|
|
Color(0xFFB709F4),
|
|
];
|
|
|
|
var pos = [1.0 / 7, 2.0 / 7, 3.0 / 7, 4.0 / 7, 5.0 / 7, 6.0 / 7, 1.0];
|
|
|
|
_paint.shader = ui.Gradient.linear(
|
|
Offset(0, 0), Offset(size.width, 0),
|
|
colors, pos, TileMode.clamp);
|
|
|
|
_paint.blendMode=BlendMode.lighten;
|
|
|
|
canvas.drawPaint(_paint);
|
|
}
|
|
|
|
|
|
@override
|
|
bool shouldRepaint(CustomPainter oldDelegate) => false;
|
|
}
|