A_SnailerThink

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A_SnailerThink is an action which is used as the Snailer's thinker. If the actor finds a player, it will line up horizontally with the player, and then shoot a missile (of type MT_ROCKET) at it every two seconds. However, the actor does not turn to face the player; it can direct its firing only up to 45° either direction from its forward-facing angle. If the actor has not yet lined up with the player, each time this action is called it adjusts its Z momentum to make the actor accelerate upwards or downwards, depending on the player's current position; Speed sets the amount of momentum added or removed per call of the action.

Code – A_SnailerThink

// Function: A_SnailerThink
//
// Description: Thinker function for Snailer
//
// var1 = unused
// var2 = unused
//
void A_SnailerThink(mobj_t *actor)
{
#ifdef HAVE_BLUA
	if (LUA_CallAction("A_SnailerThink", actor))
		return;
#endif

	if (!actor->target || !(actor->target->flags & MF_SHOOTABLE))
	{
		// look for a new target
		if (!P_LookForPlayers(actor, true, false, 0))
			return;
	}

	// We now have a target. Oh bliss, rapture, and contentment!

	if (actor->target->z + actor->target->height > actor->z - FixedMul(32*FRACUNIT, actor->scale)
		&& actor->target->z < actor->z + actor->height + FixedMul(32*FRACUNIT, actor->scale)
		&& !(leveltime % (TICRATE*2)))
	{
		angle_t an;
		fixed_t z;

		// Actor shouldn't face target, so we'll do things a bit differently here

		an = R_PointToAngle2(actor->x, actor->y, actor->target->x, actor->target->y) - actor->angle;

		z = actor->z + actor->height/2;

		if (an > ANGLE_45 && an < ANGLE_315) // fire as close as you can to the target, even if too sharp an angle from your front
		{
			fixed_t dist;
			fixed_t dx, dy;

			dist = P_AproxDistance(actor->x - actor->target->x, actor->y - actor->target->y);

			if (an > ANGLE_45 && an <= ANGLE_90) // fire at 45 degrees to the left
			{
				dx = actor->x + P_ReturnThrustX(actor, actor->angle + ANGLE_45, dist);
				dy = actor->y + P_ReturnThrustY(actor, actor->angle + ANGLE_45, dist);
			}
			else if (an >= ANGLE_270 && an < ANGLE_315) // fire at 45 degrees to the right
			{
				dx = actor->x + P_ReturnThrustX(actor, actor->angle - ANGLE_45, dist);
				dy = actor->y + P_ReturnThrustY(actor, actor->angle - ANGLE_45, dist);
			}
			else // fire straight ahead
			{
				dx = actor->x + P_ReturnThrustX(actor, actor->angle, dist);
				dy = actor->y + P_ReturnThrustY(actor, actor->angle, dist);
			}

			P_SpawnPointMissile(actor, dx, dy, actor->target->z, MT_ROCKET, actor->x, actor->y, z);
		}
		else
			P_SpawnXYZMissile(actor, actor->target, MT_ROCKET, actor->x, actor->y, z);
	}

	if ((!(actor->eflags & MFE_VERTICALFLIP) && actor->target->z > actor->z)
	|| (actor->eflags & MFE_VERTICALFLIP && (actor->target->z + actor->target->height) > (actor->z + actor->height)))
		actor->momz += FixedMul(actor->info->speed, actor->scale);
	else if ((!(actor->eflags & MFE_VERTICALFLIP) && actor->target->z < actor->z)
	|| (actor->eflags & MFE_VERTICALFLIP && (actor->target->z + actor->target->height) < (actor->z + actor->height)))
		actor->momz -= FixedMul(actor->info->speed, actor->scale);

	actor->momz /= 2;
}

	Actions – Enemy thinkers	[view]
A_BuzzFly • A_CrawlaCommanderThink • A_DetonChase • A_EggShield • A_FaceStabChase • A_FaceStabRev • A_FaceStabHurl • A_FaceStabMiss • A_StatueBurst • A_GuardChase • A_HoodThink • A_HoodFall • A_JetbThink • A_JetChase • A_JetgShoot • A_JetgThink • A_JetJawChomp • A_JetJawRoam • A_MinusCheck • A_MinusDigging • A_MinusPopup • A_PointyThink • A_SharpChase • A_SharpSpin • A_SharpDecel • A_SkimChase • A_SnailerThink • A_VultureCheck • A_VultureVtol

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