Mine

static void
spawn_magic_missile (PELEMENT ElementPtr)
{
#define MAGIC_MISSILE_SPEED DISPLAY_TO_WORLD(40)
	COUNT orig_facing;
	SIZE delta_facing;
	STARSHIPPTR StarShipPtr;
	MISSILE_BLOCK MissileBlock;
	HELEMENT hMissile;
	COUNT real_angle;

	GetElementStarShip (ElementPtr, &StarShipPtr);
	MissileBlock.farray = missileGraphicsHack;
	MissileBlock.face = orig_facing = StarShipPtr->ShipFacing;
	if ((delta_facing = TrackShip (ElementPtr, &MissileBlock.face)) > 0)
	{
		if(ElementPtr->hTarget)
		{
			ELEMENTPTR EnemyPtr;
			COUNT num_frames;
			SIZE delta_x, delta_y;

			LockElement (ElementPtr->hTarget, &EnemyPtr);
			delta_x = EnemyPtr->next.location.x
					- ElementPtr->next.location.x;
			delta_x = WRAP_DELTA_X (delta_x);
			delta_y = EnemyPtr->next.location.y
					- ElementPtr->next.location.y;
			delta_y = WRAP_DELTA_Y (delta_y);
	
			num_frames = (square_root ((long)delta_x * delta_x
					+ (long)delta_y * delta_y)) / MAGIC_MISSILE_SPEED;
			if (num_frames == 0)
				num_frames = 1;
	
			GetNextVelocityComponents (&EnemyPtr->velocity,
					&delta_x, &delta_y, num_frames);
	
			delta_x = (EnemyPtr->next.location.x + (delta_x / 2))
					- ElementPtr->next.location.x;
			delta_y = (EnemyPtr->next.location.y + (delta_y / 2))
					- ElementPtr->next.location.y;
	
			real_angle = NORMALIZE_ANGLE(ARCTAN (delta_x, delta_y) + (((TFB_Random() & 3) + 1) / 2) - 1);

			MissileBlock.face = MissileBlock.index = ANGLE_TO_FACING (real_angle);

			UnlockElement(ElementPtr->hTarget);
		}
		else MissileBlock.face = MissileBlock.index = NORMALIZE_FACING (orig_facing + delta_facing);
	}

	MissileBlock.cx = ElementPtr->next.location.x;
	MissileBlock.cy = ElementPtr->next.location.y;
	MissileBlock.sender = (ElementPtr->state_flags & (GOOD_GUY | BAD_GUY))
			| IGNORE_SIMILAR;
	MissileBlock.pixoffs = ARILOU_OFFSET;
	MissileBlock.preprocess_func = NULL_PTR;
	MissileBlock.blast_offs = 4;
	MissileBlock.speed = MAGIC_MISSILE_SPEED;
	MissileBlock.hit_points = 2;
	MissileBlock.damage = 2;
	MissileBlock.life = 12;

	hMissile = initialize_missile (&MissileBlock);

	if (hMissile)
	{
		ELEMENTPTR MissilePtr;
		LockElement(hMissile, &MissilePtr);
		SetElementStarShip (MissilePtr, StarShipPtr);
		if(ElementPtr->hTarget)
		{
			SetVelocityComponents(&MissilePtr->velocity,
					COSINE(real_angle, WORLD_TO_VELOCITY(MAGIC_MISSILE_SPEED)),
					SINE(real_angle, WORLD_TO_VELOCITY(MAGIC_MISSILE_SPEED)));
		}
		UnlockElement(hMissile);
		PutElement(hMissile);
	}
	ElementPtr->hTarget = 0;
}