Implement web-based brawler engine framework with React and TypeScript

[Copilot]

Implements a complete 2D brawler engine framework with physics, collision detection, and real-time rendering.

Architecture

Engine Core (/src/engine)

• GameEngine: 60 FPS game loop with frame-based timers, state management, and win condition detection
• Physics: Gravity, friction, collision detection, and spatial constraints

Type System (/src/types)

• Comprehensive TypeScript definitions for fighters, game state, physics vectors, and input

React Integration (/src/hooks)

• useGameEngine: Manages engine lifecycle and state synchronization
• useKeyboardInput: Event-driven input handling with configurable key bindings

Components (/src/components)

• Fighter: Visual representation with health bars and state indicators
• Stage: Game arena with ground collision
• Controls: Control scheme documentation

Fighter System

7 states: IDLE, WALKING, JUMPING, ATTACKING, HIT, BLOCKING, DEFEATED

interface Fighter {
  id: string;
  position: Vector2D;
  velocity: Vector2D;
  state: FighterState;
  direction: Direction;
  stats: FighterStats;
  hitbox: CollisionBox;
  hurtbox: CollisionBox;
  attackTimer: number;
}

Attack timing uses frame counters rather than setTimeout for consistent behavior across frame rates:

// Handle attack timer (18 frames at 60fps = 300ms)
if (fighter.state === 'ATTACKING') {
  fighter.attackTimer += deltaTime;
  if (fighter.attackTimer >= GameEngine.ATTACK_DURATION_FRAMES) {
    fighter.state = 'IDLE';
    fighter.attackTimer = 0;
  }
}

Game Mechanics

• Movement: Velocity-based with friction when grounded
• Jumping: Single jump with gravity and ground collision
• Combat: Hitbox/hurtbox collision with damage calculation and knockback
• Blocking: Negates incoming attacks
• Win Condition: Game pauses when fighter health reaches zero

Demo Implementation

Two-player game with keyboard controls:

• Player 1: WASD + Space (attack) + Shift (block)
• Player 2: Arrow keys + Enter (attack) + Right Shift (block)

Screenshots

Original prompt

This project is a web-based, brawler engine and framework built on React and TypeScript.

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