[Phase 5] React Frontend Core

[Sakeeb91]

Objective

Build interactive React frontend with core visualization components and API integration.

Deliverables

• IsingVisualizer - Heatmap of spin configuration
• ControlPanel - Temperature, size, sampler controls
• useSimulationStore - Zustand state management
• API service for backend communication
• Responsive layout with Tailwind CSS

Files to Create

File	Description
frontend/src/components/IsingVisualizer.tsx	Plotly heatmap component
frontend/src/components/ControlPanel.tsx	Parameter controls
frontend/src/store/simulationStore.ts	Zustand store
frontend/src/services/api.ts	API client
frontend/src/App.tsx	Main layout

Core Implementation

// frontend/src/components/IsingVisualizer.tsx
import Plot from 'react-plotly.js';

interface Props {
  spins: number[][];
  size: number;
}

export const IsingVisualizer: React.FC<Props> = ({ spins, size }) => (
  <Plot
    data={[{
      z: spins,
      type: 'heatmap',
      colorscale: [[0, '#3b82f6'], [1, '#ef4444']],
      showscale: false,
    }]}
    layout={{
      width: 400, height: 400,
      margin: { t: 20, b: 20, l: 20, r: 20 },
      xaxis: { visible: false },
      yaxis: { visible: false },
    }}
    config={{ displayModeBar: false }}
  />
);

// frontend/src/store/simulationStore.ts
import { create } from 'zustand';

interface SimulationState {
  temperature: number;
  latticeSize: number;
  spins: number[][] | null;
  isRunning: boolean;
  samplerType: 'mcmc' | 'diffusion';
  setTemperature: (t: number) => void;
  setLatticeSize: (s: number) => void;
  setSpins: (s: number[][]) => void;
}

export const useSimulationStore = create<SimulationState>((set) => ({
  temperature: 2.27,
  latticeSize: 32,
  spins: null,
  isRunning: false,
  samplerType: 'diffusion',
  setTemperature: (temperature) => set({ temperature }),
  setLatticeSize: (latticeSize) => set({ latticeSize }),
  setSpins: (spins) => set({ spins }),
}));

Verification

• Render 32x32 lattice in < 100ms
• Temperature slider updates store immediately
• API errors show user-friendly messages
• Layout responsive on mobile

Definition of Done

• All components render without errors
• TypeScript compiles with no errors
• Store state persists across component rerenders
• API calls succeed and update UI

Dependencies

• Phase 0: Foundation
• Phase 1: Backend sampling endpoints

Related

Meta issue: #1

[Sakeeb91]

Implementation Complete ✅

Summary

Implemented the React frontend core with interactive visualization, state management, and comprehensive test coverage.

Changes Made

Components:

• IsingVisualizer - Plotly heatmap for spin configurations
• ControlPanel - Temperature, lattice size, sampler controls
• DiffusionAnimation - Animation playback with scrubber
• CorrelationPlot & DistributionPlot - Statistical visualizations
• ErrorBoundary, LoadingSpinner, ConnectionStatus, KeyboardShortcuts

State Management:

• Zustand store with temperature, lattice size, sampler type
• Animation state (frames, playback speed, current frame)
• Selectors for derived state

Services & Utilities:

• REST API client with proper error handling
• WebSocket integration for real-time sampling
• Format, validation, and export utilities
• Custom error classes (AppError, NetworkError, etc.)

Styling:

• Tailwind CSS responsive layout
• Dark theme optimized for data visualization
• Consistent design system

Commits

26 atomic commits covering:

• Base configuration and Tailwind setup
• Component implementations
• State management
• API and utility services
• Comprehensive test suite (273 tests passing)
• CI fix for TypeScript errors

Test Coverage

• Store tests (27)
• API service tests (22)
• Utility function tests (82)
• Component tests (142)
• All tests passing with TypeScript compilation clean