24

2023-12-11 21:53:27 +08:00
parent 838d6aa668
commit 25e51d789f
104 changed files with 6414 additions and 19 deletions
--- a/packages/idraw/lib/p02/s10.dart
+++ b/packages/idraw/lib/p02/s10.dart
@@ -0,0 +1,123 @@
+import 'dart:async';
+
+import 'package:flutter/cupertino.dart';
+import 'package:flutter/material.dart';
+import 'package:flutter/services.dart';
+import 'dart:ui' as ui;
+
+/// 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> {
+  ui.Image? _img;
+  bool get hasImage => _img != null;
+
+  @override
+  void initState() {
+    _loadImage();
+    super.initState();
+  }
+
+  void _loadImage() async {
+    _img = await loadImageFromAssets('assets/images/wy_200x300.jpg');
+    setState(() {});
+  }
+
+  //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());
+  }
+
+  @override
+  Widget build(BuildContext context) {
+    return Container(
+      child: hasImage ? CustomPaint(
+        painter: PaperPainter(_img) ,
+      ): Container(),
+    );
+  }
+}
+
+class PaperPainter extends CustomPainter {
+  ui.Image? img;
+
+  PaperPainter(this.img);
+
+  @override
+  void paint(Canvas canvas, Size size) {
+    if(img!=null) {
+      drawColorFilter(canvas);
+    }
+  }
+
+  double get imgW => img!.width.toDouble();
+  double get imgH => img!.height.toDouble();
+
+  void drawColorFilter(Canvas canvas) {
+    var paint =Paint();
+    const ColorFilter identity = ColorFilter.matrix(<double>[
+      1, 0, 0, 0, 0,
+      0, 1, 0, 0, 0,
+      0, 0, 1, 0, 0,
+      0, 0, 0, 1, 0,
+    ]);
+    _drawImage(canvas, paint..colorFilter=identity,move: false);
+
+    const ColorFilter sepia = ColorFilter.matrix(<double>[
+      0.393, 0.769, 0.189, 0, 0,
+      0.349, 0.686, 0.168, 0, 0,
+      0.272, 0.534, 0.131, 0 , 0,
+      0,     0,     0,     1, 0,
+    ]);
+    _drawImage(canvas, paint..colorFilter=sepia);
+
+    const ColorFilter invert = ColorFilter.matrix(<double>[
+      -1,  0,  0, 0, 255,
+      0, -1,  0, 0, 255,
+      0,  0, -1, 0, 255,
+      0,  0,  0, 1,   0,
+    ]);
+    _drawImage(canvas, paint..colorFilter=invert);
+
+    const ColorFilter greyscale = ColorFilter.matrix(<double>[
+      0.2126, 0.7152, 0.0722, 0, 0,
+      0.2126, 0.7152, 0.0722, 0, 0,
+      0.2126, 0.7152, 0.0722, 0, 0,
+      0,      0,      0,      1, 0,
+    ]);
+    _drawImage(canvas, paint..colorFilter=greyscale);
+
+    const n = 90.0;
+    const ColorFilter light = ColorFilter.matrix(<double>[
+      1,0,0,0,n,
+      0,1,0,0,n,
+      0,0,1,0,n,
+      0,0,0,1,0
+    ]);
+    _drawImage(canvas, paint..colorFilter=light);
+  }
+
+  void _drawImage(Canvas canvas, Paint paint,{bool move=true}) {
+    if(move){
+      canvas.translate(120, 0);
+    }else{
+      canvas.translate(20, 20);
+    }
+    canvas.drawImageRect(img!,
+        Rect.fromLTRB(0, 0, imgW, imgH),
+        Rect.fromLTRB(0, 0, imgW/2, imgH/2),
+        paint);
+  }
+
+  @override
+  bool shouldRepaint(CustomPainter oldDelegate) => true;
+}