Files
iroute/assets/draw/p07/s01.dart
2023-12-16 12:40:32 +08:00

62 lines
1.5 KiB
Dart

import 'package:flutter/material.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 Container(
color: Colors.white,
child: CustomPaint(
// 使用CustomPaint
painter: PaperPainter(),
),
);
}
}
class PaperPainter extends CustomPainter {
static const double step = 20; // 方格变长
final Coordinate coordinate = Coordinate(step: step);
// 颜色列表 256 个元素
final Color colors = Color(0xffBBE9F7).withRed(0);
// final Color colors = Color(0xff00E9F9);
@override
void paint(Canvas canvas, Size size) {
Paint paint = Paint();
canvas.save();
canvas.translate(size.width / 2, size.height / 2);
List<String> values = colors.value.toRadixString(2).split('').toList();
// 遍历列表 绘制矩形色块
canvas.translate(-step * 4.0, -step * 2.0);
values.asMap().forEach((i, v) {
int line = (i % 8); // 行
int row = i ~/ 8; // 列
var topLeft = Offset(step * line, step * row);
var rect = Rect.fromPoints(topLeft, topLeft.translate(step, step));
canvas.drawRect(
rect, paint..color = v == '0' ? Colors.red : Colors.black);
});
canvas.restore();
coordinate.paint(canvas, size); //绘制坐标系
}
@override
bool shouldRepaint(CustomPainter oldDelegate) => false;
}