119 lines
2.8 KiB
Dart
119 lines
2.8 KiB
Dart
import 'dart:async';
|
|
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 StatefulWidget {
|
|
const Paper({super.key});
|
|
|
|
@override
|
|
_PaperState createState() => _PaperState();
|
|
}
|
|
|
|
class _PaperState extends State<Paper> {
|
|
@override
|
|
void initState() {
|
|
super.initState();
|
|
_loadImage();
|
|
}
|
|
|
|
void _loadImage() async {
|
|
_image =
|
|
await loadImageFromAssets('assets/images/wy_300x200.jpg');
|
|
setState(() {});
|
|
}
|
|
|
|
ui.Image? _image;
|
|
|
|
@override
|
|
Widget build(BuildContext context) {
|
|
return Container(
|
|
color: Colors.white,
|
|
child: CustomPaint(
|
|
painter: PaperPainter(
|
|
_image,
|
|
)));
|
|
}
|
|
|
|
//读取 assets 中的图片
|
|
Future<ui.Image>? loadImageFromAssets(String path) async {
|
|
ByteData data = await rootBundle.load(path);
|
|
return decodeImageFromList(data.buffer.asUint8List());
|
|
}
|
|
}
|
|
|
|
class PaperPainter extends CustomPainter {
|
|
late Paint _paint;
|
|
|
|
final double strokeWidth = 0.5;
|
|
final Color color = Colors.blue;
|
|
|
|
final ui.Image? image;
|
|
final Coordinate coordinate = Coordinate();
|
|
|
|
PaperPainter(this.image) {
|
|
_paint = Paint()
|
|
..style = PaintingStyle.fill
|
|
..strokeWidth = strokeWidth
|
|
..color = color;
|
|
}
|
|
|
|
@override
|
|
void paint(Canvas canvas, Size size) {
|
|
coordinate.paint(canvas, size);
|
|
canvas.translate(size.width / 2, size.height / 2);
|
|
_drawImage(canvas);
|
|
_drawImageRect(canvas);
|
|
}
|
|
|
|
@override
|
|
bool shouldRepaint(PaperPainter oldDelegate) => image != oldDelegate.image;
|
|
|
|
void _drawImage(Canvas canvas) {
|
|
if (image != null) {
|
|
canvas.drawImage(
|
|
image!, Offset(-image!.width / 2, -image!.height / 2), _paint);
|
|
}
|
|
}
|
|
|
|
void _drawImageRect(Canvas canvas) {
|
|
if (image != null) {
|
|
canvas.drawImageRect(
|
|
image!,
|
|
Rect.fromCenter(
|
|
center: Offset(image!.width / 2, image!.height / 2),
|
|
width: 60,
|
|
height: 60),
|
|
Rect.fromLTRB(0, 0, 100, 100).translate(200, 0),
|
|
_paint);
|
|
|
|
canvas.drawImageRect(
|
|
image!,
|
|
Rect.fromCenter(
|
|
center: Offset(image!.width / 2, image!.height / 2 - 60),
|
|
width: 60,
|
|
height: 60),
|
|
Rect.fromLTRB(0, 0, 100, 100).translate(-280, -100),
|
|
_paint);
|
|
|
|
canvas.drawImageRect(
|
|
image!,
|
|
Rect.fromCenter(
|
|
center: Offset(image!.width / 2 + 60, image!.height / 2),
|
|
width: 60,
|
|
height: 60),
|
|
Rect.fromLTRB(0, 0, 100, 100).translate(-280, 50),
|
|
_paint);
|
|
}
|
|
}
|
|
}
|