A_Boss1Chase

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A_Boss1Chase is an action that is used as the Egg Mobile's main thinker. The actor will try to chase the target player, similarly to A_Chase, but may also adjust the actor's height if MF_FLOAT is set.

Each time this action is used, the actor's reaction time will be reduced by one. When the reaction time reaches 0, the actor will choose an attack depending on its current health, execute it and set its reaction time to the value of ReactionTime, restarting the process.

When the actor is ready to attack, it will randomly pick either MeleeState or MissileState to run its attack. However, once the actor's health drops to the value of Damage or lower, it will instead use the RaiseState for the "pinch phase" attack.

Object property	Use
`SpawnState`	Returns to this state if target isn't shootable or doesn't exist
`MeleeState`	Actor randomly picks either this or `MissileState` for an attack when ready (except if health is at `Damage` or lower)
`MissileState`	Actor randomly picks either this or `MeleeState` for an attack when ready (except if health is at `Damage` or lower)
`RaiseState`	Actor's "pinch phase" attack; only used if health is at `Damage` or lower
`ReactionTime`	Value to restore actor's reaction time to after using an attack
`Speed`	Speed
`Damage`	Health point to switch to "pinch phase" mode at

Code – A_Boss1Chase

// Function: A_Boss1Chase
//
// Description: Like A_Chase, but for Boss 1.
//
// var1 = unused
// var2 = unused
//
void A_Boss1Chase(mobj_t *actor)
{
	INT32 delta;
#ifdef HAVE_BLUA
	if (LUA_CallAction("A_Boss1Chase", actor))
		return;
#endif

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

		P_SetMobjStateNF(actor, actor->info->spawnstate);
		return;
	}

	if (actor->reactiontime)
		actor->reactiontime--;

	// turn towards movement direction if not there yet
	if (actor->movedir < NUMDIRS)
	{
		actor->angle &= (7<<29);
		delta = actor->angle - (actor->movedir << 29);

		if (delta > 0)
			actor->angle -= ANGLE_45;
		else if (delta < 0)
			actor->angle += ANGLE_45;
	}

	// do not attack twice in a row
	if (actor->flags2 & MF2_JUSTATTACKED)
	{
		actor->flags2 &= ~MF2_JUSTATTACKED;
		P_NewChaseDir(actor);
		return;
	}

	if (actor->movecount)
		goto nomissile;

	if (!P_CheckMissileRange(actor))
		goto nomissile;

	if (actor->reactiontime <= 0)
	{
		if (actor->health > actor->info->damage)
		{
			if (P_RandomChance(FRACUNIT/2))
				P_SetMobjState(actor, actor->info->missilestate);
			else
				P_SetMobjState(actor, actor->info->meleestate);
		}
		else
		{
			if (actor->spawnpoint && actor->spawnpoint->extrainfo)
				P_LinedefExecute(LE_PINCHPHASE+(actor->spawnpoint->extrainfo*LE_PARAMWIDTH), actor, NULL);
			else
				P_LinedefExecute(LE_PINCHPHASE, actor, NULL);
			P_SetMobjState(actor, actor->info->raisestate);
		}

		actor->flags2 |= MF2_JUSTATTACKED;
		actor->reactiontime = actor->info->reactiontime;
		return;
	}

	// ?
nomissile:
	// possibly choose another target
	if (multiplayer && P_RandomChance(FRACUNIT/128))
	{
		if (P_LookForPlayers(actor, true, false, 0))
			return; // got a new target
	}

	if (actor->flags & MF_FLOAT && !(actor->flags2 & MF2_SKULLFLY))
	{ // Float up/down to your target's position. Stay above them, but not out of jump range.
		fixed_t target_min = actor->target->floorz+FixedMul(64*FRACUNIT, actor->scale);
		if (target_min < actor->target->z - actor->height)
			target_min = actor->target->z - actor->height;
		if (target_min < actor->floorz+FixedMul(33*FRACUNIT, actor->scale))
			target_min = actor->floorz+FixedMul(33*FRACUNIT, actor->scale);
		if (actor->z > target_min+FixedMul(16*FRACUNIT, actor->scale))
			actor->momz = FixedMul((-actor->info->speed<<(FRACBITS-1)), actor->scale);
		else if (actor->z < target_min)
			actor->momz = FixedMul(actor->info->speed<<(FRACBITS-1), actor->scale);
		else
			actor->momz = FixedMul(actor->momz,7*FRACUNIT/8);
	}

	// chase towards player
	if (P_AproxDistance(actor->target->x-actor->x, actor->target->y-actor->y) > actor->radius+actor->target->radius)
	{
		if (--actor->movecount < 0 || !P_Move(actor, actor->info->speed))
			P_NewChaseDir(actor);
	}
	// too close, don't want to chase.
	else if (--actor->movecount < 0)
	{
		// A mini-A_FaceTarget based on P_NewChaseDir.
		// Yes, it really is this simple when you get down to it.
		fixed_t deltax, deltay;

		deltax = actor->target->x - actor->x;
		deltay = actor->target->y - actor->y;

		actor->movedir = diags[((deltay < 0)<<1) + (deltax > 0)];
		actor->movecount = P_RandomByte() & 15;
	}
}

	Actions – Boss thinkers	[view]
A_Boss1Chase • A_Boss1Laser • A_Boss1Spikeballs • A_Boss2Chase • A_Boss2Pogo • A_Boss2PogoSFX • A_Boss2PogoTarget • A_Boss2TakeDamage • A_Boss3Path • A_Boss3TakeDamage • A_Boss4Raise • A_Boss4Reverse • A_Boss4SpeedUp • A_Boss7Chase • A_Boss7FireMissiles • A_BossDeath • A_BossFireShot • A_BossJetFume • A_BossScream • A_BossZoom • A_BrakChase • A_BrakFireShot • A_BrakLobShot • A_FocusTarget

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