books

2023-12-16 12:40:32 +08:00
parent ab2778a22b
commit 01fdf966c5
593 changed files with 8995 additions and 27753 deletions
--- a/assets/draw/p08/s06.dart
+++ b/assets/draw/p08/s06.dart
@@ -0,0 +1,139 @@
+import 'dart:async';
+
+import 'package:flutter/cupertino.dart';
+import 'package:flutter/material.dart';
+import 'package:flutter/services.dart';
+import 'dart:ui' as ui;
+
+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 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() {
+    super.initState();
+    _loadImage();
+  }
+
+  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(
+        color: Colors.white,
+        child: CustomPaint(
+          painter: PaperPainter(_img),
+        ));
+  }
+}
+
+class PaperPainter extends CustomPainter {
+  ui.Image? img;
+  Coordinate coordinate = Coordinate();
+
+  PaperPainter(this.img);
+
+  @override
+  void paint(Canvas canvas, Size size) {
+    if (img == null) return;
+    coordinate.paint(canvas, size);
+    canvas.translate(size.width / 2, size.height / 2);
+    canvas.translate(-120*2 - imgW / 4, -imgH / 4);
+    drawColorFilter(canvas);
+  }
+
+  double get imgW => img!.width.toDouble();
+
+  double get imgH => img!.height.toDouble();
+
+  void drawColorFilter(Canvas canvas) {
+    var paint = Paint();
+
+    _drawImage(canvas, paint);
+
+    const ColorFilter carveCarve = ColorFilter.matrix(<double>[
+      -1, 0, 0, 0, 255,
+      0, 0, 0, 0, 0,
+      0, 0, 0, 0, 0,
+      0, 0, 0, 1, 0,
+    ]);
+    paint.colorFilter = carveCarve;
+    // _drawImage(canvas, paint);
+
+    const ColorFilter negative = ColorFilter.matrix(<double>[
+      -1, 0, 0, 0, 255,
+      0, -1, 0, 0, 255,
+      0, 0, -1,0, 255,
+      0, 0, 0, 1, 0
+    ]);
+    paint.colorFilter = negative;
+    // _drawImage(canvas, paint);
+
+    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 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);
+
+    const n2 = -126.0;
+    const ColorFilter darken = ColorFilter.matrix(<double>[
+      1,0,0,0,n2,
+      0,1,0,0,n2,
+      0,0,1,0,n2,
+      0,0,0,1,0
+    ]);
+    _drawImage(canvas, paint..colorFilter=darken);
+
+  }
+
+  void _drawImage(Canvas canvas, Paint paint) {
+    canvas.drawImageRect(img!, Rect.fromLTRB(0, 0, imgW, imgH),
+        Rect.fromLTRB(0, 0, imgW / 2, imgH / 2), paint);
+    canvas.translate(120, 0);
+  }
+
+  @override
+  bool shouldRepaint(CustomPainter oldDelegate) => true;
+}