books

assets/draw/p03/s08.dart

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+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;
+}