2d-games

# 2D Game Development

> Principles for 2D game systems.

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## 1. Sprite Systems

### Sprite Organization

| Component     | Purpose                             |
| ------------- | ----------------------------------- |
| **Atlas**     | Combine textures, reduce draw calls |
| **Animation** | Frame sequences                     |
| **Pivot**     | Rotation/scale origin               |
| **Layering**  | Z-order control                     |

### Animation Principles

- Frame rate: 8-24 FPS typical
- Squash and stretch for impact
- Anticipation before action
- Follow-through after action

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## 2. Tilemap Design

### Tile Considerations

| Factor          | Recommendation      |
| --------------- | ------------------- |
| **Size**        | 16x16, 32x32, 64x64 |
| **Auto-tiling** | Use for terrain     |
| **Collision**   | Simplified shapes   |

### Layers

| Layer      | Content                 |
| ---------- | ----------------------- |
| Background | Non-interactive scenery |
| Terrain    | Walkable ground         |
| Props      | Interactive objects     |
| Foreground | Parallax overlay        |

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## 3. 2D Physics

### Collision Shapes

| Shape   | Use Case            |
| ------- | ------------------- |
| Box     | Rectangular objects |
| Circle  | Balls, rounded      |
| Capsule | Characters          |
| Polygon | Complex shapes      |

### Physics Considerations

- Pixel-perfect vs physics-based
- Fixed timestep for consistency
- Layers for filtering

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## 4. Camera Systems

### Camera Types

| Type             | Use                 |
| ---------------- | ------------------- |
| **Follow**       | Track player        |
| **Look-ahead**   | Anticipate movement |
| **Multi-target** | Two-player          |
| **Room-based**   | Metroidvania        |

### Screen Shake

- Short duration (50-200ms)
- Diminishing intensity
- Use sparingly

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## 5. Genre Patterns

### Platformer

- Coyote time (leniency after edge)
- Jump buffering
- Variable jump height

### Top-down

- 8-directional or free movement
- Aim-based or auto-aim
- Consider rotation or not

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## 6. Anti-Patterns

| ❌ Don't                 | ✅ Do                |
| ------------------------ | -------------------- |
| Separate textures        | Use atlases          |
| Complex collision shapes | Simplified collision |
| Jittery camera           | Smooth following     |
| Pixel-perfect on physics | Choose one approach  |

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> **Remember:** 2D is about clarity. Every pixel should communicate.