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openLegoLoco - Development Roadmap

Recreating LEGO Loco (1998) in C++ with raylib.

Milestone 1: Core Engine Foundation

1.1 2D Grid System

  • Implement coordinate conversion (screen <-> world)
  • Render grid with proper depth sorting
  • Camera panning with mouse drag
  • Camera zoom in/out

1.2 Tile System

  • Define tile data structure (type, connections)
  • Add tile orientation and connection metadata
  • Load and render placeholder tile sprites
  • Implement tile placement on grid
  • Tile removal/replacement
  • Road tile auto-connection logic
  • Train track manual placement with rotation

1.3 World Management

  • World data structure (2D array of tiles)
  • Save world to file
  • Load world from file

Milestone 2: User Interface

2.1 Game States

  • Main menu screen (New Game, Load Game, Quit)
  • Transition from main menu to gameplay
  • In-game state management (building vs playing)

2.2 Toy Box (Build Menu) - 3x5 button grid + close bar

The Toy Box is a floating panel with a 3-wide x 5-high button grid:

Row 1 - Placement

  • Tiles button (opens sub-menu: tracks, road pieces)
  • Buildings button (opens sub-menu: houses, stations, shops)
  • Nature button (opens sub-menu: trees, vegetation, props)

Row 2 - Removal

  • Eraser (remove single object on click)
  • Bomb (destroy all - clear entire world)
  • Undo (revert last action)

Row 3 - File

  • Load/Save button (save and load world files)
  • Background selector (change world background)
  • Bulldozer mode toggle (auto-remove when placing on top)

Row 4 - Settings

  • Windowed/Fullscreen toggle
  • Help screen
  • Audio on/off toggle

Row 5 - Close

  • Close Toy Box button (single wide button spanning full width)

2.3 Interaction Feedback

  • Hover highlights on tiles
  • Placement ghost preview
  • Selection indicators
  • Error messages for invalid actions

Milestone 3: Buildings & Objects

3.1 Building Placement

  • Building data structure (size, type, properties)
  • Multi-tile building footprints
  • Placement validation (no overlap)
  • Building removal

3.2 Core Buildings

  • Houses (minifigure spawn points)
  • Train station (passenger boarding)
  • Train depot (train spawn/storage)
  • Decorative buildings

3.3 Scenery

  • Trees and vegetation
  • Fences and props

Milestone 4: Track System

4.1 Track Tiles

  • Straight track with manual rotation
  • Curved track (3x3) with manual rotation
  • Track switches/junctions
  • Track validation (connections must align)

4.2 Track Pathfinding

  • PathGraph for path tiles
  • Extend PathGraph to track tiles
  • Calculate path along connected tracks
  • Handle junctions and switches
  • Detect loops and dead ends

Milestone 5: Trains

5.1 Basic Train Movement

  • Train entity with position on track
  • Smooth movement along track path
  • Train speed control (accelerate/brake)
  • Train stops at end of track

5.2 Train Composition

  • Locomotive sprite
  • Cargo/passenger carriage sprites
  • Multiple carriages following locomotive

5.3 Train Control

  • Select train by clicking
  • Control panel UI for selected train
  • Reverse train direction
  • Multiple trains on separate track sections

Milestone 6: Minifigures

6.1 Basic Minifigure

  • Minifigure sprite with animations (idle, walk)
  • Spawn from houses
  • Random wandering AI
  • Pathfinding on walkable areas

6.2 Minifigure Interaction

  • Pick up minifigure with mouse
  • Drop minifigure at new location
  • Minifigure walks to nearest station
  • Board train at station

6.3 Passenger System

  • Minifigures wait at stations
  • Board train when it stops
  • Exit at destination station
  • Track passenger count per train

Milestone 7: Simulation Loop

7.1 Time System

  • Simulation tick rate
  • Pause/speed controls

Milestone 8: Polish & First Playable

8.1 Audio

  • Background music?
  • Train sounds (moving, whistle)
  • UI click sounds
  • Ambient sounds

8.2 Visual Polish

  • Particle effects (loc-steam, destruction animation)

8.3 Quality of Life

  • Undo/redo for building
  • Keyboard shortcuts?
  • Settings menu (volume, resolution)
  • That weird zoom-glass function

Future Milestones (Post-v1)

  • Multiplayer (LAN)
  • Postcard system
  • More building types
  • Train customization
  • Minifigure moods and needs
  • Seasons and weather
  • Easter eggs from original game