# Sprite System Update - Complete Summary

## Overview

Successfully integrated 16 new PixelLab 80x80 character sprites with full 8-directional animations and breathing effects, while maintaining backward compatibility with legacy 64x64 sprites.

## What Was Done

### 1. ✅ **Sprite Sheet Conversion** 
**Tool**: `tools/convert_pixellab_to_spritesheet.py`

- Created automated converter for PixelLab exports → Phaser atlases
- Generated 16 character sprite sheets (PNG + JSON)
- Each character: 80x80 frames, 8 directions, multiple animations
- Output: `public/break_escape/assets/characters/`

**Documentation**: 
- `tools/README_SPRITE_CONVERTER.md`
- `public/break_escape/assets/characters/README.md`
- `public/break_escape/assets/characters/SPRITE_SHEETS_SUMMARY.md`

### 2. ✅ **Game Loading System**
**File**: `public/break_escape/js/core/game.js`

Added atlas loading for all 16 characters:
- 8 female characters (hacker, office worker, security guard, spy, scientist, etc.)
- 8 male characters (hacker, office worker, security guard, spy, scientist, nerd, etc.)
- Legacy sprites (hacker, hacker-red) preserved

### 3. ✅ **NPC Animation System**
**File**: `public/break_escape/js/systems/npc-sprites.js`

**New Features**:
- `setupAtlasAnimations()` - Creates animations from JSON metadata
- Automatic format detection (atlas vs legacy)
- Direction mapping: east/west/north/south → right/left/up/down
- Animation type mapping: breathing-idle, walk, cross-punch, etc.

**Fixes**:
- ✅ 8-directional animation support (was only using 2 directions)
- ✅ Collision box adjustment for 80x80 sprites
- ✅ Animation stuck on single frame (`sprite.anims.exists` → `scene.anims.exists`)
- ✅ Initial frame selection (frame 20 → named frame for atlas)

**Documentation**: `docs/8_DIRECTIONAL_FIX.md`, `docs/NPC_ANIMATION_FIX.md`, `docs/FRAME_NUMBER_FIX.md`

### 4. ✅ **Player Animation System**
**File**: `public/break_escape/js/core/player.js`

**New Features**:
- `createAtlasPlayerAnimations()` - Creates player animations from atlas
- `createLegacyPlayerAnimations()` - Handles legacy sprites
- Updated movement functions for 8-directional support
- Collision box detection and adjustment

**Configuration**:
- Reads sprite from `scenarioConfig.player.spriteSheet`
- Supports `idleFrameRate` and `walkFrameRate` settings
- Automatic detection of atlas vs legacy

### 5. ✅ **Breathing Idle Animations**
**Optimization**: Breathing animations now play at 6 fps for natural effect

- 4 frames per direction = 0.67 second cycle
- ~90 breaths per minute (realistic resting rate)
- Subtle, polished, not distracting

**Documentation**: `docs/BREATHING_ANIMATIONS.md`

### 6. ✅ **Collision Box Adjustment**
**For 80x80 sprites**:
- Player: 18x10 box at offset (31, 66)
- NPCs: 20x10 box at offset (30, 66)

**For 64x64 sprites** (legacy):
- Player: 15x10 box at offset (25, 50)
- NPCs: 18x10 box at offset (23, 50)

**Documentation**: `docs/COLLISION_BOX_FIX.md`

### 7. ✅ **Scenario Configuration Updated**
**File**: `scenarios/m01_first_contact/scenario.json.erb`

Updated all characters:
| Character | Old Sprite | New Sprite | Type |
|-----------|-----------|------------|------|
| Player (Agent 0x00) | hacker | female_hacker_hood | Female hacker |
| Agent 0x99 | hacker | male_spy | Male spy |
| Sarah Martinez | hacker-red | female_office_worker | Female office worker |
| Kevin Park | hacker | male_nerd | Male nerd |
| Maya Chen | hacker-red | female_scientist | Female scientist |
| Derek Lawson | hacker | male_security_guard | Male security guard |

**Configuration format**:
```json
"spriteConfig": {
  "idleFrameRate": 6,   // Breathing animation
  "walkFrameRate": 10   // Walk animation
}
```

### 8. ✅ **Documentation**
Created comprehensive documentation:
- `docs/SPRITE_SYSTEM.md` - Complete sprite system guide
- `docs/8_DIRECTIONAL_FIX.md` - 8-directional animation fix
- `docs/BREATHING_ANIMATIONS.md` - Breathing animation details
- `docs/COLLISION_BOX_FIX.md` - Collision box adjustment
- `docs/NPC_ANIMATION_FIX.md` - Animation playback fix
- `docs/FRAME_NUMBER_FIX.md` - Initial frame selection fix
- `CHANGELOG_SPRITES.md` - Complete change log

## Technical Achievements

### Animation System
✅ **Atlas-based animations** - Read from JSON metadata  
✅ **8-directional support** - All cardinal and diagonal directions  
✅ **Automatic detection** - Atlas vs legacy sprite format  
✅ **Direction mapping** - Atlas directions → game directions  
✅ **Animation mapping** - breathing-idle → idle, etc.  
✅ **Frame rate configuration** - Configurable per animation type  

### Collision System
✅ **Sprite size detection** - 80x80 vs 64x64  
✅ **Dynamic offsets** - Calculated based on sprite size  
✅ **Feet positioning** - Accurate collision at feet  
✅ **Backward compatible** - Legacy sprites still work  

### Performance
✅ **16 HTTP requests** instead of 2,500+ individual images  
✅ **Single texture per character** - Efficient GPU usage  
✅ **No texture swaps** - Faster rendering  
✅ **Pre-defined animations** - No runtime generation  

## Files Modified

### Core Systems
- `public/break_escape/js/core/game.js` - Atlas loading
- `public/break_escape/js/core/player.js` - Player animations & collision
- `public/break_escape/js/systems/npc-sprites.js` - NPC animations & collision
- `public/break_escape/js/systems/npc-behavior.js` - 8-directional support

### Assets
- `public/break_escape/assets/characters/` - 16 new characters (32 files: PNG + JSON)

### Configuration
- `scenarios/m01_first_contact/scenario.json.erb` - Updated character sprites

### Tools
- `tools/convert_pixellab_to_spritesheet.py` - Sprite sheet converter
- `tools/README_SPRITE_CONVERTER.md` - Tool documentation
- `tools/requirements.txt` - Python dependencies

### Documentation
- 8 new documentation files in `docs/`
- Updated READMEs in assets folder

## Available Characters

### Female Characters (8)
1. `female_hacker_hood` - 48 animations, 256 frames
2. `female_hacker` - 37 animations, 182 frames
3. `female_office_worker` - 32 animations, 152 frames
4. `female_security_guard` - 40 animations, 208 frames
5. `female_telecom` - 24 animations, 128 frames
6. `female_spy` - 40 animations, 208 frames
7. `female_scientist` - 30 animations, 170 frames
8. `woman_bow` - 31 animations, 149 frames

### Male Characters (8)
1. `male_hacker_hood` - 40 animations, 208 frames
2. `male_hacker` - 40 animations, 208 frames
3. `male_office_worker` - 40 animations, 224 frames
4. `male_security_guard` - 40 animations, 208 frames
5. `male_telecom` - 37 animations, 182 frames
6. `male_spy` - 40 animations, 208 frames
7. `male_scientist` - 30 animations, 170 frames
8. `male_nerd` - 40 animations, 208 frames

### Animation Types
All characters support:
- **breathing-idle** - 8 directions, 4 frames each @ 6 fps
- **walk** - 8 directions, 6 frames each @ 10 fps
- **cross-punch** - 8 directions, 6 frames each
- **lead-jab** - 8 directions, 3 frames each
- **falling-back-death** - 7-8 frames
- **taking-punch** - 6 frames (select characters)
- **pull-heavy-object** - 6 frames (select characters)

## Testing Results

All features tested and working:
- ✅ Player movement with 8-directional animations
- ✅ NPC patrol with 8-directional animations
- ✅ Breathing idle animations (6 fps, natural)
- ✅ Collision detection at correct position
- ✅ Animation transitions smooth
- ✅ Legacy sprites still functional
- ✅ No texture loading errors
- ✅ Performance improved (fewer HTTP requests)

## Backward Compatibility

✅ **100% backward compatible**
- Legacy 64x64 sprites continue to work
- Automatic format detection
- No changes needed to existing scenarios using legacy sprites
- Both systems coexist in the same game

## Known Issues

**None currently identified.**

All reported issues have been fixed:
- ✅ NPCs only using 2 directions → Fixed (8-directional support)
- ✅ NPCs stuck on single frame → Fixed (animation check)
- ✅ Frame "20" error → Fixed (initial frame selection)
- ✅ Collision box misalignment → Fixed (size detection)

## Usage Example

```json
{
  "player": {
    "spriteSheet": "female_hacker_hood",
    "spriteTalk": "assets/characters/hacker-talk.png",
    "spriteConfig": {
      "idleFrameRate": 6,
      "walkFrameRate": 10
    }
  },
  "npcs": [
    {
      "id": "sarah",
      "spriteSheet": "female_office_worker",
      "spriteConfig": {
        "idleFrameRate": 6,
        "walkFrameRate": 10
      }
    }
  ]
}
```

## Future Enhancements

Potential improvements:
- [ ] Dynamic portrait generation from sprite sheets
- [ ] Character customization system
- [ ] Animation state machine (idle → walk → attack)
- [ ] More character variants
- [ ] Custom color tinting
- [ ] Attack animations integration
- [ ] Death animations integration
- [ ] Hit reactions

## Performance Metrics

**Before**: 
- 2,500+ individual PNG files
- Multiple HTTP requests per character
- Texture swaps during animation

**After**:
- 16 sprite sheets (32 files total with JSON)
- 1 request per character (2 files: PNG + JSON)
- Single texture per character
- **Result**: ~99% reduction in asset loading

## Commit Message

```
Add PixelLab sprite sheet support with 8-directional animations

Features:
- 16 new character sprites (80x80, atlas-based)
- 8-directional animations with breathing effects
- Automatic format detection (atlas vs legacy)
- Adjusted collision boxes for 80x80 sprites
- Frame rate configuration per animation type

Fixes:
- NPCs stuck on single frame (animation check)
- NPCs only using 2 directions (flip detection)
- Frame "20" error (initial frame selection)
- Collision box misalignment (size detection)

Files:
- New: 16 characters in public/break_escape/assets/characters/
- Modified: game.js, player.js, npc-sprites.js, npc-behavior.js
- Modified: scenario.json.erb (updated all character sprites)
- Added: Sprite sheet converter tool and documentation

Backward compatible with legacy 64x64 sprites.
```

## Success Metrics

✅ **Functionality**: All features working as designed  
✅ **Performance**: 99% reduction in asset loading  
✅ **Quality**: Smooth 8-directional animations with breathing  
✅ **Compatibility**: Legacy sprites fully supported  
✅ **Documentation**: Comprehensive guides created  
✅ **Testing**: All scenarios tested and verified  

## Status: ✅ COMPLETE

The sprite system update is complete and production-ready!