Demo App Phase 3: Polish, Examples & Export

[gsdali]

Overview

Polish the demo app with syntax highlighting, examples, and export.

Parent issue: #25
Depends on: #26, #27

Goals

• Add syntax highlighting to code editor
• Create example library with presets
• Add properties panel (volume, area, faces)
• Implement save/load scripts
• Add export functionality (STEP, STL)

Features

Syntax Highlighting

struct SyntaxHighlighter {
    // Keywords: Workplane, result, true, false
    // Methods: .box, .cylinder, .fillet, .union
    // Numbers: 10, 3.14, -5
    // Strings: "XY", ">Z"
    // Comments: // comment
}

Example Library

Example	Description	Concepts
Basic Box	Simple box with fillet	Primitives, fillet
Mounting Bracket	L-bracket with holes	Workplanes, holes, fillet
Pipe Fitting	Hollow cylinder	Boolean cut
Gear	Extruded polygon	Polygon, extrude
Enclosure	Box with shell	Shell, fillet

Properties Panel

Display for current model:

• Volume (mm³)
• Surface area (mm²)
• Center of mass
• Bounding box dimensions
• Face count
• Edge count
• Vertex count

Export Options

• STEP file (CAD interchange)
• STL file (3D printing)
• Copy JavaScript code

UI Enhancements

┌─────────────────────────────────────────────────────────────┐
│  OCCTSwift Playground            [Examples ▼] [Export] [▶]  │
├─────────────────────┬───────────────────────────────────────┤
│  // Syntax colored  │     ┌─────────────────────┐           │
│  result = Workplane │     │                     │           │
│    .box(10, 20, 5)  │     │   [3D Viewport]     │           │
│    .fillet(1)       │     │                     │           │
├─────────────────────┤     └─────────────────────┘           │
│  Console            ├───────────────────────────────────────┤
│  ✓ Built in 0.12s   │  Properties                           │
│  Faces: 10          │  Volume: 892.3 mm³                    │
│  Edges: 24          │  Surface: 614.2 mm²                   │
└─────────────────────┴───────────────────────────────────────┘

Acceptance Criteria

• Syntax highlighting works
• At least 5 example scripts included
• Properties panel shows model info
• Can save/load scripts
• Can export to STEP and STL
• Professional UI appearance

Effort Estimate

~4 days