#define TILE_SIZE (20)
#define ARENA_WIDTH_TILES (10)
#define ARENA_HEIGHT_TILES (10)
#define COLLISION_GRID_SIZE (ARENA_WIDTH_TILES / 2 * TILE_SIZE)

#define MOUSE_DISTANCE (32)

#define RABBIT_MOTION_DRAG (2)
#define RABBIT_MOTION_ACCELERATION (5)
#define RABBIT_MOTION_MAX_SPEED (12)
#define RABBIT_MOTION_VELOCITY_DECAY (5)

#define RABBIT_BULLET_LIMIT (12)
#define RABBIT_BULLET_VELOCITY ((RABBIT_MOTION_ACCELERATION / 2) + 1)
#define RABBIT_BULLET_COOLDOWN (10)
#define RABBIT_BULLET_HEIGHT_START (8)

#define RABBIT_HEALTH_MAX (100)

#define MOUSE_LIMIT_TOP (TILE_SIZE)
#define MOUSE_LIMIT_BOTTOM ((ARENA_HEIGHT_TILES - 1) * TILE_SIZE - 1)
#define MOUSE_LIMIT_LEFT (TILE_SIZE)
#define MOUSE_LIMIT_RIGHT ((ARENA_WIDTH_TILES - 1) * TILE_SIZE - 1)

#define RAD2DEG (180/3.14159)
#define DEG2RAD (3.14159/180)

#define ENEMY_MAX_COUNT (50)
#define ENEMY_BULLET_LIMIT (ENEMY_MAX_COUNT / 4)

#define ENEMY_MOVE_SPEED (1)
#define ENEMY_MOVE_DELAY (3)
#define ENEMY_BULLET_VELOCITY (RABBIT_BULLET_VELOCITY - 2)

#define ENEMY_FIRE_MIN_DELAY (45)
#define ENEMY_FIRE_VARIABLE_DELAY (60)

#define ENEMY_BULLET_DAMAGE (3)
#define ENEMY_COLLISION_DAMAGE (6)
#define ENEMY_KILL_HEALTH_GAIN (1)
#define ENEMY_HIT_POINT_DIFFICULTY_INCREASE_EVERY (4)

#define BASE_ENEMY_SPAWN_COOLDOWN (30)
#define DIFFICULTY_SPAWN_COOLDOWN_REDUCTION (2)
#define MINIMUM_ENEMY_SPAWN_COOLDOWN (3)
#define VARIABLE_ENEMY_SPAWN_COOLDOWN (10)