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序言:从服务业实体向生物学微观干预的范式跃迁

纵观当代美业服务实体之演进,其本质乃是对人类体表附属器官——毛囊及其衍生物(角蛋白纤维)的理化干预过程。传统的理发馆会员管理系统(CRM),往往囿于机械的“充值、扣卡、金银铜VIP级别”等浅层财务逻辑,却彻底剥离了美发行为的生物物理学本源。在生命科学视野下,所谓“剪发”,不过是角蛋白大分子的物理切断与末端形态学重构;所谓“烫发”,则是通过高温与还原剂打破胱氨酸二硫键(Disulfide bonds)后,再进行几何扭矩层面上的热力学重塑;而“染发”,无非是对黑色素细胞(Melanocyte)排布的遮蔽与高分子合成色素的晶格渗透。

鉴于此,本文摒弃了常规的全栈开发思维,在开源鸿蒙(OpenHarmony)的跨端分布式框架之上,依托 Flutter 强悍的 Skia/Impeller 图形底层,为美业领域架构了一套史无前例的**“毛囊角蛋白生命周期与生物特征识别档案系统”**。我们将每一个会员抽象为一束具备“基因型、角蛋白完整度、二硫键扭矩频率”的生命图元,将每一次服务转化为系统状态机中的一次理化矩阵仿射。


核心系统架构论证

在解构系统的工程化路径时,必须对物理学干预与数据拓扑的流转进行严密的控制反转(Inversion of Control)建模。

领域对象与物理渲染 UML 拓扑图

我们构建的测绘引擎,涵盖了生物特征数据库、渲染状态机以及物理特效发射器三大模块,其互相之间的强耦合关系可通过下述 Mermaid 领域驱动设计(DDD)类图予以厘清。

archives >

renders >

1

1

n

1

FollicleArchiveDashboard

-Ticker _renderTicker

-double _time

-double _targetCurl

-double _currentCurl

-Color _currentColor

-List<LaserParticle> _particles

+_syncTargetState()

+_performShear()

+_performThermodynamicPerm()

+_performPigmentInfiltration()

BioMemberProfile

+String id

+String name

+String genotype

+double keratinIntegrity

+double melaninLevel

+double curlFrequency

+Color pigmentColor

+DateTime lastIntervention

KeratinTopologyPainter

+double time

+double curlFrequency

+double integrity

+Color pigment

+List<LaserParticle> particles

+paint(Canvas canvas, Size size)

传统会员维度与生物学维度的参数映射表

传统 CRM 维度 本系统生物学映射参数 物理学/生化学内涵解释 Flutter 渲染层表现
会员姓名/卡号 基因组序列码 (Genotype ID) 唯一的 DNA 身份与染色体标记 等宽字体呈现的赛博标牌
剪发频次/到店率 结构完整度 (Keratin Integrity) 毛鳞片磨损率与发丝分叉程度阻尼 画笔描边厚度与正弦噪声扰动幅度
烫发项目状态 二硫键扭矩 (Torque/Curl Freq) 胱氨酸重构后的宏观几何螺旋频率 二次曲线在纵轴上的高频三角函数振幅
染发/锁色状态 色素表达晶格 (Pigment Color) 黑色素剥离后的人工合成化学大分子色晕 带有泛光遮罩 (MaskFilter) 的路径填充
表 1:跨学科参数范式的降维映射与视觉转换机制

理化干预系统的运转流程机理

在这套赛博朋克风格的测绘台中,理发操作不再是一个账单的生成,而是一次触发物理粒子的干预波。我们定义了三种核心理化操作:

物理剪切干预 (Shear)
即理发。对长出的受损末端进行宏观维度的物理切割,由于除去了分叉,其“角蛋白完整度”指标将呈跃迁式恢复,并伴随青色激光粒子的断裂溅射。
二硫键热力学重组 (Thermodynamic Perm)
即烫发/拉直。注入高能热量打破角质层间的胱氨酸键并重塑,其表现为几何形态的坍缩或扭曲。该操作具有高度破坏性,会导致角蛋白完整度的锐减,并产生红色蒸汽粒子群的挥发弥散。
高分子色素渗透 (Pigmentation)
即染发。强化学试剂侵入毛鳞片深层,导致整根纤维颜色的基因级覆写,系统将弹出高分子色素配方库供实时插值渲染。

物理剪切

热力学重塑

色素渗透

生物测绘仪扫描

读取当前选定会员 DNA 序列

装载角蛋白各项生化指标

启动 Ticker 与 KeratinTopologyPainter 渲染基质

发生何种理化干预?

切除受损末端

Integrity += 0.2

发射青色剪切电浆粒子

打破二硫键结构

Integrity -= 0.15

翻转 Curl Frequency 卷曲几何参数

释放高温红色蒸汽粒子

强化学染料入侵毛鳞片

Integrity -= 0.1

重写 Pigment 状态变量

释放全息流体色谱粒子

阻尼插值器平滑过渡动画


核心算法代码剖析体系

为了在这座微观的手术台上展现最真实的物理学交互,我们深入剖析 Flutter 底层的四大工程化模块实现逻辑。

模块一:角蛋白双螺旋结构的高维几何方程推演

KeratinTopologyPainter 画布中,如何用纯代码画出一根逼真且随“受损度”与“卷曲度”动态变化的毛发?我们应用了带有噪声扰动的三角函数叠加贝塞尔序列。

在数学层面上,角蛋白三维扭矩在二维投影面上的偏移可近似为如下公式:
Δ x ( y , t ) = sin ⁡ ( ω ⋅ y + 2 t ) ⋅ ( ω ⋅ C ) + N ( y , t ) ⋅ ( 1 − I ) \Delta x(y, t) = \sin\left(\omega \cdot y + 2t\right) \cdot (\omega \cdot C) + \mathcal{N}(y, t) \cdot (1 - \mathcal{I}) Δx(y,t)=sin(ωy+2t)(ωC)+N(y,t)(1I)
其中, ω \omega ω 为频率 $freq$ C C C 为常量放大系数, N ( y , t ) \mathcal{N}(y, t) N(y,t) 为高频毛糙噪声函数, I \mathcal{I} I 为代表结构完整度的 $integrity$ 变量。

    final path = Path();
    final int segments = 100;
    final double segmentHeight = size.height / segments;
    
    for (int i = 0; i <= segments; i++) {
      final y = size.height - i * segmentHeight;
      // Y轴高度向上的生长过程,卷曲度通过正弦波引入
      // curlFrequency 决定振幅和频率,time 引入呼吸微动
      final double amplitude = curlFrequency * 60.0;
      final double freq = curlFrequency * 0.05;
      
      final xOffset = sin(i * freq + time * 2) * amplitude;
      // 添加毛鳞片受损时的微小毛糙噪声 (Integrity 影响)
      final noise = (1.0 - integrity) * (sin(i * 13.5 + time * 10) * 5.0);
      
      final x = centerX + xOffset + noise;
      
      if (i == 0) {
        path.moveTo(x, y);
      } else {
        path.lineTo(x, y);
      }
    }

剖析: 此代码段实现了将抽象的烫发“卷度” curlFrequency 转化为屏幕上的振幅与波长。尤为精妙的是,通过引入高频正弦算子 sin(i * 13.5) 并将其乘以 (1.0 - integrity),当会员头发受损严重(完整度低)时,不仅主线条会变细,边缘更会产生不规则的毛刺和噪点抖动,彻底还原了“发质枯草化”的真实触感。

模块二:生物学指标的物理阻尼插值系统

理发和烫发的过程并非瞬间的生硬位移,而是一个物质形态逐渐重塑的物理渐变。我们在 Ticker 内构建了基于常系数的阻尼微分状态机。

    _renderTicker = createTicker((elapsed) {
      setState(() {
        _time = elapsed.inMicroseconds / 1000000.0;
        
        // 阻尼逼近目标状态
        _currentCurl += (_targetCurl - _currentCurl) * 0.05;
        _currentColor = Color.lerp(_currentColor, _targetColor, 0.05) ?? _currentColor;
        
        // 粒子系统衰减计算...
      });
    });

剖析: 我们并不直接改变渲染变量 _currentCurl,而是赋予业务逻辑一个 _targetCurl 目标标量。在每一帧中,利用差值乘以 0.05 的阻尼系数进行渐进逼近。当烫发指令下达时,原本直线的角蛋白大分子,将会犹如被加热的记忆金属一般,在 1~2 秒内极其丝滑、妖娆地扭曲成大波浪形态。这也是动画领域中常用的弹簧物理隐喻的变形应用。

模块三:高分子层叠泛光遮罩与质感高光处理

为了让单纯的一根线条呈现出“顶级发廊焗油后的柔顺质感”,不仅需要底层路径,还必须有光学层面的高光剥离。

    // 发丝发光遮罩(模拟角蛋白光泽度,完整度越高越光泽)
    canvas.drawPath(path, strandPaint);
    
    final glossPaint = Paint()
      ..style = PaintingStyle.stroke
      ..strokeWidth = 8.0
      ..strokeCap = StrokeCap.round
      ..color = Colors.white.withOpacity(integrity * 0.4)
      ..maskFilter = const MaskFilter.blur(BlurStyle.normal, 5.0);
      
    // 光泽路径比主路径稍微偏左上方,形成立体高光
    final glossPath = Path();
    for (int i = 0; i <= segments; i++) {
      // ... 计算偏移 ...
      final x = centerX + xOffset + noise - 6.0; // 偏移产生高光
      
      if (i == 0) {
        glossPath.moveTo(x, y);
      } else {
        glossPath.lineTo(x, y);
      }
    }
    canvas.drawPath(glossPath, glossPaint);

剖析: 这里运用了高级图形学中的 Multi-Pass Rendering 理念。第一遍绘制主色调的粗实线,并辅以轻微的 MaskFilter 让边缘具备有机物的柔和感。第二遍,我们单独拉出一条宽度极窄的路径 glossPath,强制向左偏移 6.0 像素,以纯白色半透明画笔进行高斯模糊覆盖。这个微小的错位,利用人类大脑对环境光阴影的脑补,瞬间生成了强烈的“3D柱体圆润反光感”,且其透射率受 integrity 严格钳制——发质越差,反光越黯淡。

模块四:物理切变状态下的电浆粒子系统

粒子发射器是展现破坏性能量的极佳载体。当发生剪发、烫发或染发时,伴随结构完整度暴跌的,是系统释放出的各类“化学粒子”。

  // 物理剪切(理发)触发
  void _performShear() {
    final member = _database[_selectedIndex];
    member.keratinIntegrity = min(1.0, member.keratinIntegrity + 0.2); 
    
    // 触发切割激光粒子
    for(int i=0; i<30; i++) {
      _particles.add(LaserParticle(
        x: 200 + _random.nextDouble() * 100,
        y: 200 + _random.nextDouble() * 200,
        vx: (_random.nextDouble() - 0.5) * 10,
        vy: (_random.nextDouble() - 0.5) * 10,
        color: const Color(0xFF00FFCC),
        life: 1.0,
      ));
    }
  }

剖析: 我们构建了一个轻量级的无约束 LaserParticle 集群。当按钮按下时,在毛发坐标域内随机喷发 30 个具有独立二维初始速度向量 (vx, vy) 的电浆生命体。这些生命体在 Ticker 循环中根据牛顿第一定律进行惯性漂移,并不断扣减其生命周期标量 life。在绘制层,利用 3.0 * p.life 动态缩减粒子半径,最终在消失前产生壮观的燃烧蒸发假象,极大地强化了化学干预的感官冲击。


结语:重构商业逻辑的跨学科美学

利用 Flutter 的跨平台能力与开源鸿蒙的全场景分布式战略,将一套本质上极为世俗的“理发馆会员储值列表”进行彻头彻尾的“生命科学升维改造”,不仅是对底层 Canvas 图形能力极限的极限施压,更是探寻泛应用开发哲学边界的有趣尝试。

我们在代码中注入了生物学的悲悯与物理学的严谨:每一次对会员基因图谱的选中,都在唤醒一根带有粗糙毛边和呼吸起伏的有机角蛋白纤维;每一次针对颜色的重绘与曲线的扭转,都遵循着严格的阻尼消耗与热力学惩罚机制。这不仅是一场编程秀,更是一套关于“人体组织与外部干预环境对抗”的壮丽史诗论述。

完整代码

import 'dart:math';
import 'dart:ui' as ui;
import 'package:flutter/material.dart';
import 'package:flutter/scheduler.dart';

void main() {
  runApp(const MaterialApp(
    debugShowCheckedModeBanner: false,
    home: FollicleArchiveDashboard(),
  ));
}

/// 生物学会员档案(代替传统的VIP会员卡)
class BioMemberProfile {
  final String id;
  final String name;
  final String genotype; // 基因型标记
  double keratinIntegrity; // 角蛋白完整度 (0.0 - 1.0)
  double melaninLevel; // 黑色素水平 / 染料渗透度
  double curlFrequency; // 卷曲频率 (0.0 = 直发, 1.0 = 高度卷曲)
  Color pigmentColor; // 当前色素表达
  final DateTime lastIntervention; // 上次理化干预时间

  BioMemberProfile({
    required this.id,
    required this.name,
    required this.genotype,
    this.keratinIntegrity = 1.0,
    this.melaninLevel = 0.8,
    this.curlFrequency = 0.0,
    this.pigmentColor = const Color(0xFF1E1E1E),
    required this.lastIntervention,
  });
}

/// 理发馆会员管理系统:毛囊角蛋白生命周期测绘台
class FollicleArchiveDashboard extends StatefulWidget {
  const FollicleArchiveDashboard({super.key});

  @override
  State<FollicleArchiveDashboard> createState() => _FollicleArchiveDashboardState();
}

class _FollicleArchiveDashboardState extends State<FollicleArchiveDashboard> with TickerProviderStateMixin {
  late Ticker _renderTicker;
  double _time = 0.0;

  // 模拟数据库中的会员列表
  final List<BioMemberProfile> _database = [
    BioMemberProfile(id: "BIO-001", name: "Alpha", genotype: "A1-XX", lastIntervention: DateTime.now().subtract(const Duration(days: 30))),
    BioMemberProfile(id: "BIO-002", name: "Beta", genotype: "B2-XY", keratinIntegrity: 0.6, curlFrequency: 0.8, pigmentColor: const Color(0xFF8B4513), lastIntervention: DateTime.now().subtract(const Duration(days: 120))),
    BioMemberProfile(id: "BIO-003", name: "Gamma", genotype: "G3-XX", keratinIntegrity: 0.4, curlFrequency: 0.2, pigmentColor: const Color(0xFFD2B48C), lastIntervention: DateTime.now().subtract(const Duration(days: 15))),
    BioMemberProfile(id: "BIO-004", name: "Delta", genotype: "D4-XY", keratinIntegrity: 0.9, curlFrequency: 0.0, pigmentColor: const Color(0xFF0F0F0F), lastIntervention: DateTime.now().subtract(const Duration(days: 2))),
  ];

  int _selectedIndex = 0;

  // 动画状态插值器(用于平滑过渡理化干预)
  double _targetCurl = 0.0;
  double _currentCurl = 0.0;
  Color _targetColor = Colors.black;
  Color _currentColor = Colors.black;
  
  // 物理切割闪光粒子特效
  final List<LaserParticle> _particles = [];
  final Random _random = Random();

  @override
  void initState() {
    super.initState();
    _syncTargetState();
    
    _renderTicker = createTicker((elapsed) {
      setState(() {
        _time = elapsed.inMicroseconds / 1000000.0;
        
        // 阻尼逼近目标状态
        _currentCurl += (_targetCurl - _currentCurl) * 0.05;
        _currentColor = Color.lerp(_currentColor, _targetColor, 0.05) ?? _currentColor;
        
        // 粒子系统衰减
        for (int i = _particles.length - 1; i >= 0; i--) {
          _particles[i].life -= 0.02;
          _particles[i].x += _particles[i].vx;
          _particles[i].y += _particles[i].vy;
          if (_particles[i].life <= 0) {
            _particles.removeAt(i);
          }
        }
      });
    });
    _renderTicker.start();
  }

  void _syncTargetState() {
    _targetCurl = _database[_selectedIndex].curlFrequency;
    _targetColor = _database[_selectedIndex].pigmentColor;
    _currentCurl = _targetCurl;
    _currentColor = _targetColor;
  }

  void _selectMember(int index) {
    setState(() {
      _selectedIndex = index;
      _targetCurl = _database[_selectedIndex].curlFrequency;
      _targetColor = _database[_selectedIndex].pigmentColor;
    });
  }

  // 物理剪切(理发)
  void _performShear() {
    final member = _database[_selectedIndex];
    member.keratinIntegrity = min(1.0, member.keratinIntegrity + 0.2); // 剪去受损末端,提升整体平均完整度
    
    // 触发切割激光粒子
    for(int i=0; i<30; i++) {
      _particles.add(LaserParticle(
        x: 200 + _random.nextDouble() * 100,
        y: 200 + _random.nextDouble() * 200,
        vx: (_random.nextDouble() - 0.5) * 10,
        vy: (_random.nextDouble() - 0.5) * 10,
        color: const Color(0xFF00FFCC),
        life: 1.0,
      ));
    }
  }

  // 热力学重塑二硫键(烫发)
  void _performThermodynamicPerm() {
    final member = _database[_selectedIndex];
    member.keratinIntegrity = max(0.1, member.keratinIntegrity - 0.15); // 烫发造成热损伤
    member.curlFrequency = member.curlFrequency < 0.5 ? 0.9 : 0.0; // 反转状态
    _targetCurl = member.curlFrequency;

    // 触发热能蒸汽粒子
    for(int i=0; i<20; i++) {
      _particles.add(LaserParticle(
        x: 100 + _random.nextDouble() * 200,
        y: 400 + _random.nextDouble() * 50,
        vx: (_random.nextDouble() - 0.5) * 2,
        vy: -_random.nextDouble() * 5 - 2, // 向上飘散
        color: const Color(0xFFFF5555),
        life: 1.5,
      ));
    }
  }

  // 高分子色素浸透(染发)
  void _performPigmentInfiltration(Color newColor) {
    final member = _database[_selectedIndex];
    member.keratinIntegrity = max(0.1, member.keratinIntegrity - 0.1); // 染发化学损伤
    member.pigmentColor = newColor;
    _targetColor = newColor;
    
    // 触发色素浸染涟漪
    for(int i=0; i<40; i++) {
      _particles.add(LaserParticle(
        x: 150 + _random.nextDouble() * 100,
        y: 100 + _random.nextDouble() * 300,
        vx: (_random.nextDouble() - 0.5) * 4,
        vy: (_random.nextDouble() - 0.5) * 4,
        color: newColor,
        life: 1.2,
      ));
    }
  }

  @override
  void dispose() {
    _renderTicker.dispose();
    super.dispose();
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      backgroundColor: const Color(0xFF0A0A0F),
      body: LayoutBuilder(
        builder: (context, constraints) {
          final isPortrait = constraints.maxHeight > constraints.maxWidth;
          
          if (isPortrait) {
            return Column(
              children: [
                Expanded(flex: 2, child: _buildMemberArchives()),
                const Divider(color: Color(0xFF1E1E2E), height: 1),
                Expanded(flex: 3, child: _buildFollicleVisualizer()),
              ],
            );
          } else {
            return Row(
              children: [
                Expanded(flex: 2, child: _buildMemberArchives()),
                const VerticalDivider(color: Color(0xFF1E1E2E), width: 1),
                Expanded(flex: 3, child: _buildFollicleVisualizer()),
              ],
            );
          }
        },
      ),
    );
  }

  Widget _buildMemberArchives() {
    return Container(
      decoration: const BoxDecoration(
        color: Color(0xFF0D0D15),
      ),
      child: Column(
        crossAxisAlignment: CrossAxisAlignment.start,
        children: [
          Padding(
            padding: const EdgeInsets.all(24.0),
            child: Row(
              children: [
                const Icon(Icons.fingerprint, color: Colors.cyanAccent, size: 28),
                const SizedBox(width: 12),
                Text(
                  "生物特征档案库\nBiometric Archiving System",
                  style: TextStyle(
                    color: Colors.white.withOpacity(0.9),
                    fontSize: 16,
                    fontWeight: FontWeight.bold,
                    letterSpacing: 1.5,
                  ),
                ),
              ],
            ),
          ),
          Expanded(
            child: ListView.builder(
              padding: const EdgeInsets.symmetric(horizontal: 16),
              itemCount: _database.length,
              itemBuilder: (context, index) {
                final member = _database[index];
                final isSelected = index == _selectedIndex;
                
                return GestureDetector(
                  onTap: () => _selectMember(index),
                  child: AnimatedContainer(
                    duration: const Duration(milliseconds: 300),
                    margin: const EdgeInsets.only(bottom: 12),
                    padding: const EdgeInsets.all(16),
                    decoration: BoxDecoration(
                      color: isSelected ? const Color(0xFF1A1A2E) : const Color(0xFF12121C),
                      border: Border.all(
                        color: isSelected ? Colors.cyanAccent.withOpacity(0.5) : const Color(0xFF2A2A35),
                        width: 1.5,
                      ),
                      borderRadius: BorderRadius.circular(12),
                      boxShadow: isSelected ? [
                        BoxShadow(color: Colors.cyanAccent.withOpacity(0.1), blurRadius: 10, spreadRadius: 1)
                      ] : [],
                    ),
                    child: Row(
                      children: [
                        // 基因型微章
                        Container(
                          padding: const EdgeInsets.all(8),
                          decoration: BoxDecoration(
                            color: Colors.black45,
                            borderRadius: BorderRadius.circular(8),
                          ),
                          child: Text(
                            member.genotype,
                            style: TextStyle(color: isSelected ? Colors.cyanAccent : Colors.white54, fontFamily: 'monospace', fontSize: 12),
                          ),
                        ),
                        const SizedBox(width: 16),
                        Expanded(
                          child: Column(
                            crossAxisAlignment: CrossAxisAlignment.start,
                            children: [
                              Text(member.name, style: const TextStyle(color: Colors.white, fontSize: 18, fontWeight: FontWeight.bold)),
                              const SizedBox(height: 4),
                              Text("上次基因干预: ${member.lastIntervention.toString().substring(0, 10)}", style: const TextStyle(color: Colors.white38, fontSize: 12)),
                            ],
                          ),
                        ),
                        // 状态指示环
                        CircularProgressIndicator(
                          value: member.keratinIntegrity,
                          backgroundColor: const Color(0xFF2A2A35),
                          color: Color.lerp(Colors.redAccent, Colors.greenAccent, member.keratinIntegrity),
                        )
                      ],
                    ),
                  ),
                );
              },
            ),
          )
        ],
      ),
    );
  }

  Widget _buildFollicleVisualizer() {
    final member = _database[_selectedIndex];
    return Container(
      decoration: BoxDecoration(
        gradient: RadialGradient(
          center: const Alignment(0, 0.2),
          radius: 1.2,
          colors: [
            const Color(0xFF1A1A2A),
            const Color(0xFF0A0A0F),
          ],
        ),
      ),
      child: Stack(
        children: [
          // 核心生物学图层:角蛋白物理引擎画板
          Positioned.fill(
            child: CustomPaint(
              painter: KeratinTopologyPainter(
                time: _time,
                curlFrequency: _currentCurl,
                integrity: member.keratinIntegrity,
                pigment: _currentColor,
                particles: _particles,
              ),
            ),
          ),
          
          // 生物标记HUD
          Positioned(
            top: 24,
            left: 24,
            child: Column(
              crossAxisAlignment: CrossAxisAlignment.start,
              children: [
                const Text("角蛋白双螺旋分析矩阵", style: TextStyle(color: Colors.white54, letterSpacing: 2, fontSize: 12)),
                const SizedBox(height: 8),
                Text(member.name, style: const TextStyle(color: Colors.white, fontSize: 32, fontWeight: FontWeight.w900)),
                const SizedBox(height: 16),
                _buildHUDBar("结构完整度 (Integrity)", member.keratinIntegrity, Colors.greenAccent),
                const SizedBox(height: 8),
                _buildHUDBar("二硫键扭矩 (Torque)", _currentCurl, Colors.orangeAccent),
              ],
            ),
          ),

          // 理化干预控制台(理发馆操作按钮)
          Positioned(
            bottom: 32,
            left: 0,
            right: 0,
            child: Center(
              child: Wrap(
                spacing: 16,
                runSpacing: 16,
                alignment: WrapAlignment.center,
                children: [
                  _buildInterventionButton(
                    "物理剪切干预\n(Shear)", 
                    Icons.content_cut, 
                    Colors.cyanAccent, 
                    _performShear,
                  ),
                  _buildInterventionButton(
                    "二硫键热力学重组\n(Thermodynamic Perm)", 
                    Icons.waves, 
                    Colors.orangeAccent, 
                    _performThermodynamicPerm,
                  ),
                  _buildInterventionButton(
                    "高分子色素渗透\n(Pigmentation)", 
                    Icons.format_color_fill, 
                    Colors.pinkAccent, 
                    () => _showPigmentSelector(),
                  ),
                ],
              ),
            ),
          ),
        ],
      ),
    );
  }

  Widget _buildHUDBar(String label, double value, Color color) {
    return SizedBox(
      width: 200,
      child: Column(
        crossAxisAlignment: CrossAxisAlignment.start,
        children: [
          Text("$label: ${(value * 100).toStringAsFixed(1)}%", style: const TextStyle(color: Colors.white70, fontSize: 10)),
          const SizedBox(height: 4),
          ClipRRect(
            borderRadius: BorderRadius.circular(2),
            child: LinearProgressIndicator(
              value: value,
              minHeight: 4,
              backgroundColor: const Color(0xFF2A2A35),
              color: color,
            ),
          ),
        ],
      ),
    );
  }

  Widget _buildInterventionButton(String label, IconData icon, Color color, VoidCallback onTap) {
    return InkWell(
      onTap: onTap,
      borderRadius: BorderRadius.circular(12),
      child: Container(
        width: 140,
        height: 80,
        padding: const EdgeInsets.all(8),
        decoration: BoxDecoration(
          color: const Color(0xFF12121A),
          border: Border.all(color: color.withOpacity(0.5)),
          borderRadius: BorderRadius.circular(12),
          boxShadow: [
            BoxShadow(color: color.withOpacity(0.1), blurRadius: 8, spreadRadius: 1)
          ]
        ),
        child: Column(
          mainAxisAlignment: MainAxisAlignment.center,
          children: [
            Icon(icon, color: color, size: 24),
            const SizedBox(height: 4),
            Text(label, textAlign: TextAlign.center, style: TextStyle(color: Colors.white70, fontSize: 10, height: 1.2)),
          ],
        ),
      ),
    );
  }

  void _showPigmentSelector() {
    showModalBottomSheet(
      context: context,
      backgroundColor: const Color(0xFF1A1A2A),
      builder: (context) {
        final colors = [
          Colors.black,
          const Color(0xFF8B4513), // 棕色
          const Color(0xFFFFD700), // 金色
          const Color(0xFFFF2A2A), // 红色
          const Color(0xFF00FFCC), // 赛博青
          const Color(0xFFA020F0), // 紫色
        ];
        return Padding(
          padding: const EdgeInsets.all(24.0),
          child: Column(
            mainAxisSize: MainAxisSize.min,
            children: [
              const Text("高分子色素配方库", style: TextStyle(color: Colors.white, fontSize: 18, fontWeight: FontWeight.bold)),
              const SizedBox(height: 20),
              Wrap(
                spacing: 16,
                runSpacing: 16,
                children: colors.map((c) => GestureDetector(
                  onTap: () {
                    Navigator.pop(context);
                    _performPigmentInfiltration(c);
                  },
                  child: Container(
                    width: 60, height: 60,
                    decoration: BoxDecoration(
                      color: c,
                      shape: BoxShape.circle,
                      border: Border.all(color: Colors.white24, width: 2),
                      boxShadow: [BoxShadow(color: c.withOpacity(0.5), blurRadius: 10)]
                    ),
                  ),
                )).toList(),
              )
            ],
          ),
        );
      },
    );
  }
}

class LaserParticle {
  double x, y, vx, vy, life;
  Color color;
  LaserParticle({required this.x, required this.y, required this.vx, required this.vy, required this.color, required this.life});
}

/// 角蛋白双螺旋物理渲染器
class KeratinTopologyPainter extends CustomPainter {
  final double time;
  final double curlFrequency;
  final double integrity;
  final Color pigment;
  final List<LaserParticle> particles;

  KeratinTopologyPainter({
    required this.time,
    required this.curlFrequency,
    required this.integrity,
    required this.pigment,
    required this.particles,
  });

  @override
  void paint(Canvas canvas, Size size) {
    final centerX = size.width / 2;
    
    // 绘制毛囊基座 (Follicle Base)
    final folliclePaint = Paint()
      ..shader = ui.Gradient.radial(
        Offset(centerX, size.height - 20), 
        80, 
        [Colors.redAccent.withOpacity(0.2), Colors.transparent]
      )
      ..maskFilter = const MaskFilter.blur(BlurStyle.normal, 20);
    canvas.drawCircle(Offset(centerX, size.height), 100, folliclePaint);

    // 绘制角蛋白主干 (Keratin Strand)
    final strandPaint = Paint()
      ..style = PaintingStyle.stroke
      ..strokeWidth = 30.0 * (0.5 + integrity * 0.5) // 完整度越低,毛发越细
      ..strokeCap = StrokeCap.round
      ..color = pigment.withOpacity(0.8)
      ..maskFilter = const MaskFilter.blur(BlurStyle.solid, 2.0); // 毛发质感边缘微柔和

    // 加入物理扰动与卷曲度方程
    final path = Path();
    final int segments = 100;
    final double segmentHeight = size.height / segments;
    
    for (int i = 0; i <= segments; i++) {
      final y = size.height - i * segmentHeight;
      // Y轴高度向上的生长过程,卷曲度通过正弦波引入
      // curlFrequency 决定振幅和频率,time 引入呼吸微动
      final double amplitude = curlFrequency * 60.0;
      final double freq = curlFrequency * 0.05;
      
      final xOffset = sin(i * freq + time * 2) * amplitude;
      // 添加毛鳞片受损时的微小毛糙噪声 (Integrity 影响)
      final noise = (1.0 - integrity) * (sin(i * 13.5 + time * 10) * 5.0);
      
      final x = centerX + xOffset + noise;
      
      if (i == 0) {
        path.moveTo(x, y);
      } else {
        path.lineTo(x, y);
      }
    }
    
    // 发丝发光遮罩(模拟角蛋白光泽度,完整度越高越光泽)
    canvas.drawPath(path, strandPaint);
    
    final glossPaint = Paint()
      ..style = PaintingStyle.stroke
      ..strokeWidth = 8.0
      ..strokeCap = StrokeCap.round
      ..color = Colors.white.withOpacity(integrity * 0.4)
      ..maskFilter = const MaskFilter.blur(BlurStyle.normal, 5.0);
      
    // 光泽路径比主路径稍微偏左上方,形成立体高光
    final glossPath = Path();
    for (int i = 0; i <= segments; i++) {
      final y = size.height - i * segmentHeight;
      final double amplitude = curlFrequency * 60.0;
      final double freq = curlFrequency * 0.05;
      final xOffset = sin(i * freq + time * 2) * amplitude;
      final noise = (1.0 - integrity) * (sin(i * 13.5 + time * 10) * 5.0);
      final x = centerX + xOffset + noise - 6.0; // 偏移产生高光
      
      if (i == 0) {
        glossPath.moveTo(x, y);
      } else {
        glossPath.lineTo(x, y);
      }
    }
    canvas.drawPath(glossPath, glossPaint);

    // 绘制粒子效果
    for(var p in particles) {
      final pPaint = Paint()
        ..color = p.color.withOpacity(p.life)
        ..maskFilter = const MaskFilter.blur(BlurStyle.normal, 4.0);
      canvas.drawCircle(Offset(p.x, p.y), 3.0 * p.life, pPaint);
      
      final corePaint = Paint()..color = Colors.white.withOpacity(p.life);
      canvas.drawCircle(Offset(p.x, p.y), 1.0 * p.life, corePaint);
    }
  }

  @override
  bool shouldRepaint(covariant KeratinTopologyPainter oldDelegate) => true;
}

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