# Atomizer Canvas - Visual Workflow Builder

**Last Updated**: January 16, 2026
**Version**: 3.0
**Status**: Production

---

## Overview

The Atomizer Canvas is a visual, node-based workflow builder for designing optimization studies. It provides a drag-and-drop interface for configuring FEA optimizations that integrates with Claude to validate and execute workflows.

### Key Features

- **Visual Workflow Design**: Drag-and-drop nodes to build optimization pipelines
- **Professional Lucide Icons**: Clean, consistent iconography throughout the interface
- **Auto-Load from Studies**: Import existing optimization_config.json files
- **NX Model Introspection**: Automatically extract expressions from .prt/.sim/.fem files
- **File Browser**: Browse and select model files with type filtering
- **Expression Search**: Searchable dropdown for design variable configuration
- **One-Click Add**: Add discovered expressions as design variables instantly
- **Claude Integration**: "Process with Claude" button for AI-assisted study creation
- **Responsive Layout**: Full-screen canvas that adapts to window size

### What's New in V3

| Feature | Description |
|---------|-------------|
| **File Browser** | Browse studies directory for .sim/.prt/.fem/.afem files |
| **Introspection Panel** | View discovered expressions, extractors, and dependencies |
| **One-Click Add** | Add expressions as design variables with a single click |
| **Claude Fixes** | Fixed SQL errors, WebSocket reconnection issues |
| **Health Check** | `/api/health` endpoint for database monitoring |

---

## Architecture

### Frontend Stack

| Component | Technology | Purpose |
|-----------|------------|---------|
| Flow Engine | React Flow | Node-based graph rendering |
| State Management | Zustand | Canvas state (nodes, edges, selection) |
| Icons | Lucide React | Professional icon library |
| Styling | Tailwind CSS | Dark theme (Atomaster palette) |
| Chat | WebSocket | Real-time Claude communication |

### Node Types (8)

| Node | Icon | Description | Color |
|------|------|-------------|-------|
| **Model** | `Cube` | NX model file (.prt, .sim, .fem) | Blue |
| **Solver** | `Cpu` | Nastran solution type (SOL101, SOL103, etc.) | Violet |
| **Design Variable** | `SlidersHorizontal` | Parameter to optimize with bounds | Emerald |
| **Extractor** | `FlaskConical` | Physics result extraction (E1-E10) | Cyan |
| **Objective** | `Target` | Optimization goal (minimize/maximize) | Rose |
| **Constraint** | `ShieldAlert` | Design constraint (upper/lower bounds) | Amber |
| **Algorithm** | `BrainCircuit` | Optimization method (TPE, CMA-ES, NSGA-II) | Indigo |
| **Surrogate** | `Rocket` | Neural acceleration (optional) | Pink |

### File Structure

```
atomizer-dashboard/frontend/src/
├── components/canvas/
│   ├── AtomizerCanvas.tsx        # Main canvas component
│   ├── nodes/
│   │   ├── index.ts              # Node type registry
│   │   ├── BaseNode.tsx          # Base node with handles
│   │   ├── ModelNode.tsx         # Model file node
│   │   ├── SolverNode.tsx        # Solver type node
│   │   ├── DesignVarNode.tsx     # Design variable node
│   │   ├── ExtractorNode.tsx     # Extractor node
│   │   ├── ObjectiveNode.tsx     # Objective node
│   │   ├── ConstraintNode.tsx    # Constraint node
│   │   ├── AlgorithmNode.tsx     # Algorithm node
│   │   └── SurrogateNode.tsx     # Surrogate node
│   ├── panels/
│   │   ├── NodeConfigPanel.tsx   # Node configuration sidebar
│   │   ├── ValidationPanel.tsx   # Validation toast display
│   │   ├── ExecuteDialog.tsx     # Execute confirmation modal
│   │   ├── ChatPanel.tsx         # Claude chat sidebar
│   │   ├── ConfigImporter.tsx    # Study import dialog
│   │   ├── TemplateSelector.tsx  # Workflow template chooser
│   │   ├── FileBrowser.tsx       # File picker modal (V3)
│   │   ├── IntrospectionPanel.tsx # Model introspection results (V3)
│   │   └── ExpressionSelector.tsx # Expression search dropdown (V3)
│   └── palette/
│       └── NodePalette.tsx       # Draggable node palette
├── hooks/
│   ├── useCanvasStore.ts         # Zustand store for canvas state
│   └── useCanvasChat.ts          # Claude chat integration
├── lib/canvas/
│   ├── schema.ts                 # TypeScript type definitions
│   ├── intent.ts                 # Intent serialization (174 lines)
│   ├── validation.ts             # Graph validation logic
│   └── templates.ts              # Workflow templates
└── pages/
    └── CanvasView.tsx            # Canvas page (/canvas route)
```

---

## User Interface

### Layout

```
┌───────────────────────────────────────────────────────────────────┐
│  Canvas Builder                                    Templates Import│
├──────────┬────────────────────────────────────────────┬───────────┤
│          │                                            │           │
│  Node    │              Canvas Area                   │  Config   │
│  Palette │                                            │  Panel    │
│          │   ┌─────┐      ┌─────┐      ┌─────┐       │           │
│  [Model] │   │Model├──────│Solver├──────│Algo │       │  Label:   │
│  [Solver]│   └─────┘      └──┬──┘      └─────┘       │  [____]   │
│  [DVar]  │                   │                        │           │
│  [Extr]  │   ┌─────┐      ┌──┴──┐      ┌─────┐       │  Type:    │
│  [Obj]   │   │ DVar├──────│Extr ├──────│ Obj │       │  [____]   │
│  [Const] │   └─────┘      └─────┘      └─────┘       │           │
│  [Algo]  │                                            │           │
│  [Surr]  │                                            │           │
│          │                                            │           │
├──────────┴────────────────────────────────────────────┴───────────┤
│                     [Validate]  [Process with Claude]              │
└───────────────────────────────────────────────────────────────────┘
```

### Dark Theme (Atomaster Palette)

| Element | Color | Tailwind Class |
|---------|-------|----------------|
| Background | `#050A12` | `bg-dark-900` |
| Surface | `#0A1525` | `bg-dark-850` |
| Card | `#0F1E32` | `bg-dark-800` |
| Border | `#1A2F4A` | `border-dark-700` |
| Muted Text | `#5A7A9A` | `text-dark-400` |
| Primary | `#00D4E6` | `text-primary-400` |

---

## Core Workflows

### 1. Building a Workflow

1. **Drag nodes** from the left palette onto the canvas
2. **Connect nodes** by dragging from output handle to input handle
3. **Configure nodes** by clicking to open the config panel
4. **Validate** using the Validate button
5. **Process with Claude** to create the study

### 2. Importing from Existing Study

1. Click **Import** in the header
2. Select the **Load Study** tab
3. **Search** for your study by name
4. **Select** a study with an optimization_config.json
5. Click **Load Study** to populate the canvas

### 3. Using Templates

1. Click **Templates** in the header
2. Browse available workflow templates:
   - **Mass Minimization**: Single-objective mass reduction
   - **Multi-Objective**: Pareto optimization (mass + displacement)
   - **Turbo Mode**: Neural-accelerated optimization
   - **Mirror WFE**: Zernike wavefront error optimization
   - **Frequency Target**: Natural frequency optimization
3. Click a template to load it

### 4. Processing with Claude

1. Build and configure your workflow
2. Click **Validate** to check for errors
3. Click **Process with Claude** to:
   - Validate the configuration against Atomizer protocols
   - Receive recommendations (method selection, trial count)
   - Create the optimization study

---

## Node Configuration

### Model Node

| Field | Description | Example |
|-------|-------------|---------|
| File Path | Path to NX model | `models/bracket.sim` |
| File Type | prt, sim, or fem | `sim` |

When loading a `.sim` file, the system introspects to find:
- Linked `.prt` (geometry part)
- Linked `.fem` (FEM file)
- Solver type (SOL101, SOL103, etc.)
- Available expressions

### Design Variable Node

| Field | Description | Example |
|-------|-------------|---------|
| Expression Name | NX expression to vary | `thickness` |
| Min Value | Lower bound | `5.0` |
| Max Value | Upper bound | `15.0` |
| Unit | Engineering unit | `mm` |

**Expression Selector**: Click the dropdown to:
- **Search** through available expressions
- **Filter** by name
- **Refresh** to reload from model
- **Enter manually** if expression not found

### Extractor Node

| Field | Description | Options |
|-------|-------------|---------|
| Extractor ID | Protocol E1-E10 | E1 (Displacement), E2 (Frequency), etc. |
| Name | Display name | `max_displacement` |
| Config | Extractor-specific settings | Node ID, component, etc. |

**Available Extractors** (SYS_12):

| ID | Physics | Function |
|----|---------|----------|
| E1 | Displacement | `extract_displacement()` |
| E2 | Frequency | `extract_frequency()` |
| E3 | Stress | `extract_solid_stress()` |
| E4 | BDF Mass | `extract_mass_from_bdf()` |
| E5 | CAD Mass | `extract_mass_from_expression()` |
| E8 | Zernike | `extract_zernike_coefficients()` |
| E9 | Zernike | `extract_zernike_rms()` |
| E10 | Zernike | `extract_zernike_wfe()` |

### Objective Node

| Field | Description | Options |
|-------|-------------|---------|
| Name | Objective identifier | `mass`, `displacement` |
| Direction | Optimization goal | `minimize`, `maximize` |
| Weight | Multi-objective weight | `1.0` (0.0-10.0) |

### Constraint Node

| Field | Description | Example |
|-------|-------------|---------|
| Name | Constraint identifier | `max_stress` |
| Operator | Comparison type | `<=`, `>=`, `==` |
| Value | Threshold value | `250.0` |

### Algorithm Node

| Field | Description | Options |
|-------|-------------|---------|
| Method | Optimization algorithm | TPE, CMA-ES, NSGA-II, GP-BO |
| Max Trials | Number of trials | `100` |
| Timeout | Optional time limit | `3600` (seconds) |

**Method Selection** (SYS_15):

| Method | Best For | Design Vars | Objectives |
|--------|----------|-------------|------------|
| TPE | General purpose | 1-10 | 1 |
| CMA-ES | Many variables | 5-100 | 1 |
| NSGA-II | Multi-objective | 1-20 | 2-4 |
| GP-BO | Expensive evaluations | 1-10 | 1 |

### Surrogate Node

| Field | Description | Options |
|-------|-------------|---------|
| Enabled | Toggle acceleration | true/false |
| Model Type | Surrogate architecture | MLP, GNN, Auto |
| Min Trials | Trials before activation | `20` |

---

## File Browser (V3)

The File Browser allows you to navigate the studies directory to select model files.

### Features

- **Directory Navigation**: Browse folder hierarchy with breadcrumbs
- **Type Filtering**: Filters to `.sim`, `.prt`, `.fem`, `.afem` by default
- **Search**: Quick search by file name
- **Single-Click Select**: Click a file to select and close

### Usage

1. Click the **Browse** button (folder icon) next to the Model file path input
2. Navigate to your study folder
3. Click a model file to select it
4. The path is automatically populated in the Model node

---

## Model Introspection (V3)

Model Introspection analyzes NX model files to discover expressions, solver type, and dependencies.

### Features

- **Expression Discovery**: Lists all expressions found in the model
- **Solver Detection**: Infers solver type from file contents (SOL101, SOL103, etc.)
- **Dependency Tracking**: Shows related .prt, .fem, .afem files
- **Extractor Suggestions**: Recommends extractors based on solver type
- **One-Click Add**: Add expressions as Design Variables instantly

### Usage

1. Configure a **Model** node with a valid file path
2. Click **Introspect Model** button
3. View discovered expressions, extractors, and files
4. Click **+** next to any expression to add as Design Variable
5. Click **+** next to any extractor to add to canvas

### Discovered Information

| Section | Contents |
|---------|----------|
| **Solver Type** | Detected solver (SOL101, SOL103, etc.) |
| **Expressions** | Name, current value, unit |
| **Extractors** | Available extractors for this solver |
| **Dependent Files** | Related .prt, .fem, .afem files |

---

## API Integration

### Backend Endpoints

#### Study Configuration

```
GET  /api/studies/                    # List all studies
GET  /api/studies/{path}/config       # Get optimization_config.json
```

#### File Browser (V3)

```
GET  /api/files/list                 # List files in directory
  Query: path=subdir&types=.sim,.prt,.fem,.afem
  Returns: { files: [{name, path, isDirectory}], path }
```

#### NX Introspection (V3)

```
POST /api/nx/introspect              # Introspect NX model file
  Body: { file_path: string }
  Returns: {
    file_path, file_type, expressions, solver_type,
    dependent_files, extractors_available, warnings
  }

GET  /api/nx/expressions             # Get expressions from model
  Query: file_path=path/to/model.sim
  Returns: { expressions: [{name, value, unit, type}] }
```

#### Health Check (V3)

```
GET  /api/health                     # Check database and service health
  Returns: { status: "healthy", database: "connected" }
```

### MCP Canvas Tools

The Canvas integrates with the MCP server for Claude tool use:

#### `validate_canvas_intent`

Validates an optimization intent from the Canvas.

```typescript
{
  intent: OptimizationIntent  // The canvas workflow as JSON
}
// Returns: { valid, errors, warnings, recommendations }
```

#### `execute_canvas_intent`

Creates an optimization study from a validated intent.

```typescript
{
  intent: OptimizationIntent,
  study_name: string,         // snake_case name
  auto_run?: boolean          // Start optimization immediately
}
// Returns: { study_path, config_path, status }
```

#### `interpret_canvas_intent`

Analyzes a Canvas intent and provides recommendations.

```typescript
{
  intent: OptimizationIntent
}
// Returns: {
//   problem_type: "single-objective" | "multi-objective",
//   complexity: "low" | "medium" | "high",
//   recommended_method: string,
//   recommended_trials: number,
//   surrogate_recommended: boolean,
//   notes: string[]
// }
```

---

## OptimizationIntent Schema

The Canvas serializes workflows to the `OptimizationIntent` JSON format:

```typescript
interface OptimizationIntent {
  model: {
    path: string;
    type: 'prt' | 'sim' | 'fem';
  };
  solver: {
    type: string;  // SOL101, SOL103, etc.
  };
  design_variables: Array<{
    name: string;
    expression: string;
    min: number;
    max: number;
    unit?: string;
  }>;
  extractors: Array<{
    id: string;    // E1, E2, etc.
    name: string;
    config?: Record<string, unknown>;
  }>;
  objectives: Array<{
    name: string;
    extractor: string;
    direction: 'minimize' | 'maximize';
    weight?: number;
  }>;
  constraints?: Array<{
    name: string;
    extractor: string;
    operator: '<=' | '>=' | '==';
    value: number;
  }>;
  optimization: {
    method: string;
    max_trials: number;
    timeout?: number;
  };
  surrogate?: {
    enabled: boolean;
    model_type?: string;
    min_trials?: number;
  };
}
```

---

## Validation Rules

The Canvas validates workflows against these rules:

### Required Components

- At least 1 **Model** node
- At least 1 **Solver** node
- At least 1 **Design Variable** node
- At least 1 **Objective** node
- At least 1 **Algorithm** node

### Configuration Rules

- All nodes must be **configured** (no empty fields)
- Design variable **min < max**
- Objective must connect to an **Extractor**
- Extractor ID must be valid (E1-E10)

### Connection Rules

- Model → Solver (required)
- Solver → Extractor (required for each extractor)
- Extractor → Objective (required for each objective)
- Extractor → Constraint (optional)

### Recommendations

- Multi-objective (2+ objectives) should use **NSGA-II**
- Many variables (5+) may benefit from **surrogate**
- High trial count (100+) should consider **neural acceleration**

---

## Templates

### Mass Minimization

Single-objective mass reduction with stress constraint.

- **Nodes**: 6 (Model, Solver, DVar, Extractor, Objective, Algorithm)
- **Objective**: Minimize mass
- **Constraint**: Max stress < limit
- **Method**: TPE (100 trials)

### Multi-Objective

Pareto optimization for mass vs. displacement trade-off.

- **Nodes**: 7
- **Objectives**: Minimize mass, Minimize displacement
- **Method**: NSGA-II (150 trials)

### Turbo Mode

Neural-accelerated optimization with surrogate.

- **Nodes**: 8 (includes Surrogate)
- **Objective**: User-defined
- **Method**: TPE + MLP Surrogate
- **Trials**: 50 FEA + 5000 surrogate

### Mirror WFE

Zernike wavefront error optimization for optics.

- **Nodes**: 7
- **Objective**: Minimize WFE (E10)
- **Method**: CMA-ES (200 trials)

### Frequency Target

Natural frequency optimization with modal analysis.

- **Nodes**: 6
- **Objective**: Target frequency (E2)
- **Method**: TPE (100 trials)

---

## Keyboard Shortcuts

| Key | Action |
|-----|--------|
| `Delete` / `Backspace` | Delete selected node |
| `Escape` | Deselect all |
| `Ctrl+Z` | Undo (future) |
| `Ctrl+Shift+Z` | Redo (future) |
| `Space` (hold) | Pan canvas |
| Scroll | Zoom in/out |

---

## Troubleshooting

### Canvas Not Visible

- Ensure you're on the `/canvas` route
- Check for JavaScript errors in browser console
- Verify React Flow is properly initialized

### Nodes Not Draggable

- Check that drag-and-drop events are being captured
- Ensure `onDragStart` sets the correct data type

### Config Panel Not Updating

- Verify Zustand store is properly connected
- Check that `updateNodeData` is being called

### Claude Chat Not Working

- Check WebSocket connection status (green indicator)
- Verify backend is running on port 8000
- Check `/api/chat/` endpoint is accessible

### Expression Dropdown Empty

- Ensure a Model node is configured with a file path
- Check `/api/nx/expressions` endpoint is working
- Try the "Refresh" button to reload expressions

---

## Development

### Running Locally

```bash
# Frontend
cd atomizer-dashboard/frontend
npm install
npm run dev

# Backend
cd atomizer-dashboard/backend
python -m uvicorn api.main:app --reload --port 8000

# MCP Server
cd mcp-server/atomizer-tools
npm run build
npm run dev
```

### Building for Production

```bash
# Frontend
cd atomizer-dashboard/frontend
npm run build

# MCP Server
cd mcp-server/atomizer-tools
npm run build
```

### Adding New Node Types

1. Create node component in `components/canvas/nodes/`
2. Add type to `schema.ts`
3. Register in `nodes/index.ts`
4. Add to `NodePalette.tsx`
5. Update validation rules in `validation.ts`
6. Add serialization logic to `intent.ts`

---

## References

- **React Flow Documentation**: https://reactflow.dev/
- **Lucide Icons**: https://lucide.dev/icons/
- **Zustand**: https://github.com/pmndrs/zustand
- **Atomizer Protocols**: See `docs/protocols/`
- **Extractor Library**: See `SYS_12_EXTRACTOR_LIBRARY.md`
- **Method Selector**: See `SYS_15_METHOD_SELECTOR.md`

---

*Canvas Builder: Design optimizations visually, execute with AI.*