C++ CalcEntitySpot函數代碼示例

void NPC_BSCinematic( void ) 
{

	if( NPCInfo->scriptFlags & SCF_FIRE_WEAPON )
	{
		WeaponThink( qtrue );
	}

	if ( UpdateGoal() )
	{//have a goalEntity
		//move toward goal, should also face that goal
		NPC_MoveToGoal( qtrue );
	}

	if ( NPCInfo->watchTarget )
	{//have an entity which we want to keep facing
		//NOTE: this will override any angles set by NPC_MoveToGoal
		vec3_t eyes, viewSpot, viewvec, viewangles;

		CalcEntitySpot( NPC, SPOT_HEAD_LEAN, eyes );
		CalcEntitySpot( NPCInfo->watchTarget, SPOT_HEAD_LEAN, viewSpot );

		VectorSubtract( viewSpot, eyes, viewvec );
		
		vectoangles( viewvec, viewangles );

		NPCInfo->lockedDesiredYaw = NPCInfo->desiredYaw = viewangles[YAW];
		NPCInfo->lockedDesiredPitch = NPCInfo->desiredPitch = viewangles[PITCH];
	}

	NPC_UpdateAngles( qtrue, qtrue );
}

qboolean InFOV ( gentity_t *ent, gentity_t *from, int hFOV, int vFOV ) 
{
	vec3_t	eyes;
	vec3_t	spot;
	vec3_t	deltaVector;
	vec3_t	angles, fromAngles;
	vec3_t	deltaAngles;

	if( from->client )
	{
		if( !VectorCompare( from->client->renderInfo.eyeAngles, vec3_origin ) )
		{//Actual facing of tag_head!
			//NOTE: Stasis aliens may have a problem with this?
			VectorCopy( from->client->renderInfo.eyeAngles, fromAngles );
		}
		else
		{
			VectorCopy( from->client->ps.viewangles, fromAngles );
		}
	}
	else
	{
		VectorCopy(from->s.angles, fromAngles);
	}

	CalcEntitySpot( from, SPOT_HEAD_LEAN, eyes );

	CalcEntitySpot( ent, SPOT_ORIGIN, spot );
	VectorSubtract ( spot, eyes, deltaVector);

	vectoangles ( deltaVector, angles );
	deltaAngles[PITCH] = AngleDelta ( fromAngles[PITCH], angles[PITCH] );
	deltaAngles[YAW] = AngleDelta ( fromAngles[YAW], angles[YAW] );
	if ( fabs ( deltaAngles[PITCH] ) <= vFOV && fabs ( deltaAngles[YAW] ) <= hFOV ) 
	{
		return qtrue;
	}

	CalcEntitySpot( ent, SPOT_HEAD, spot );
	VectorSubtract ( spot, eyes, deltaVector);
	vectoangles ( deltaVector, angles );
	deltaAngles[PITCH] = AngleDelta ( fromAngles[PITCH], angles[PITCH] );
	deltaAngles[YAW] = AngleDelta ( fromAngles[YAW], angles[YAW] );
	if ( fabs ( deltaAngles[PITCH] ) <= vFOV && fabs ( deltaAngles[YAW] ) <= hFOV ) 
	{
		return qtrue;
	}

	CalcEntitySpot( ent, SPOT_LEGS, spot );
	VectorSubtract ( spot, eyes, deltaVector);
	vectoangles ( deltaVector, angles );
	deltaAngles[PITCH] = AngleDelta ( fromAngles[PITCH], angles[PITCH] );
	deltaAngles[YAW] = AngleDelta ( fromAngles[YAW], angles[YAW] );
	if ( fabs ( deltaAngles[PITCH] ) <= vFOV && fabs ( deltaAngles[YAW] ) <= hFOV ) 
	{
		return qtrue;
	}

	return qfalse;
}

/*
CanSee
determine if NPC can see an entity

This is a straight line trace check.  This function does not look at PVS or FOV,
or take any AI related factors (for example, the NPC's reaction time) into account

FIXME do we need fat and thin version of this?
*/
qboolean CanSee ( gentity_t *ent )
{
	trace_t		tr;
	vec3_t		eyes;
	vec3_t		spot;

	CalcEntitySpot( NPC, SPOT_HEAD_LEAN, eyes );

	CalcEntitySpot( ent, SPOT_ORIGIN, spot );
	gi.trace ( &tr, eyes, NULL, NULL, spot, NPC->s.number, MASK_OPAQUE, (EG2_Collision)0, 0 );
	ShotThroughGlass (&tr, ent, spot, MASK_OPAQUE);
	if ( tr.fraction == 1.0 )
	{
		return qtrue;
	}

	CalcEntitySpot( ent, SPOT_HEAD, spot );
	gi.trace ( &tr, eyes, NULL, NULL, spot, NPC->s.number, MASK_OPAQUE, (EG2_Collision)0, 0 );
	ShotThroughGlass (&tr, ent, spot, MASK_OPAQUE);
	if ( tr.fraction == 1.0 )
	{
		return qtrue;
	}

	CalcEntitySpot( ent, SPOT_LEGS, spot );
	gi.trace ( &tr, eyes, NULL, NULL, spot, NPC->s.number, MASK_OPAQUE, (EG2_Collision)0, 0 );
	ShotThroughGlass (&tr, ent, spot, MASK_OPAQUE);
	if ( tr.fraction == 1.0 )
	{
		return qtrue;
	}

	return qfalse;
}

qboolean NPC_FacePosition( vec3_t position, qboolean doPitch )
{
	vec3_t		muzzle;
	vec3_t		angles;
	float		yawDelta;
	qboolean	facing = qtrue;

	//Get the positions
	if ( NPC->client && (NPC->client->NPC_class == CLASS_RANCOR || NPC->client->NPC_class == CLASS_WAMPA) )// || NPC->client->NPC_class == CLASS_SAND_CREATURE) )
	{
		CalcEntitySpot( NPC, SPOT_ORIGIN, muzzle );
		muzzle[2] += NPC->r.maxs[2] * 0.75f;
	}
	else if ( NPC->client && NPC->client->NPC_class == CLASS_GALAKMECH )
	{
		CalcEntitySpot( NPC, SPOT_WEAPON, muzzle );
	}
	else
	{
		CalcEntitySpot( NPC, SPOT_HEAD_LEAN, muzzle );//SPOT_HEAD
	}

	//Find the desired angles
	GetAnglesForDirection( muzzle, position, angles );

	NPCInfo->desiredYaw		= AngleNormalize360( angles[YAW] );
	NPCInfo->desiredPitch	= AngleNormalize360( angles[PITCH] );

	if ( NPC->enemy && NPC->enemy->client && NPC->enemy->client->NPC_class == CLASS_ATST )
	{
		// FIXME: this is kind of dumb, but it was the easiest way to get it to look sort of ok
		NPCInfo->desiredYaw	+= flrand( -5, 5 ) + sin( level.time * 0.004f ) * 7;
		NPCInfo->desiredPitch += flrand( -2, 2 );
	}
	//Face that yaw
	NPC_UpdateAngles( qtrue, qtrue );

	//Find the delta between our goal and our current facing
	yawDelta = AngleNormalize360( NPCInfo->desiredYaw - ( SHORT2ANGLE( ucmd.angles[YAW] + client->ps.delta_angles[YAW] ) ) );
	
	//See if we are facing properly
	if ( fabs( yawDelta ) > VALID_ATTACK_CONE )
		facing = qfalse;

	if ( doPitch )
	{
		//Find the delta between our goal and our current facing
		float currentAngles = ( SHORT2ANGLE( ucmd.angles[PITCH] + client->ps.delta_angles[PITCH] ) );
		float pitchDelta = NPCInfo->desiredPitch - currentAngles;
		
		//See if we are facing properly
		if ( fabs( pitchDelta ) > VALID_ATTACK_CONE )
			facing = qfalse;
	}

	return facing;
}

/*
-------------------------
Remote_Fire
-------------------------
*/
void Remote_Fire (void)
{
	vec3_t	delta1, enemy_org1, muzzle1;
	vec3_t	angleToEnemy1;
	static	vec3_t	forward, vright, up;
//	static	vec3_t	muzzle;
	gentity_t	*missile;

	CalcEntitySpot( NPC->enemy, SPOT_HEAD, enemy_org1 );
	VectorCopy( NPC->r.currentOrigin, muzzle1 );
	
	VectorSubtract (enemy_org1, muzzle1, delta1);

	vectoangles ( delta1, angleToEnemy1 );
	AngleVectors (angleToEnemy1, forward, vright, up);

	missile = CreateMissile( NPC->r.currentOrigin, forward, 1000, 10000, NPC, qfalse );

	G_PlayEffectID( G_EffectIndex("bryar/muzzle_flash"), NPC->r.currentOrigin, forward );

	missile->classname = "briar";
	missile->s.weapon = WP_BRYAR_PISTOL;

	missile->damage = 10;
	missile->dflags = DAMAGE_DEATH_KNOCKBACK;
	missile->methodOfDeath = MOD_BRYAR_PISTOL;
	missile->clipmask = MASK_SHOT | CONTENTS_LIGHTSABER;

}

//---------------------------------------------------------
gentity_t *WP_DropThermal( gentity_t *ent )
//---------------------------------------------------------
{
	AngleVectors( ent->client->ps.viewangles, wpFwd, wpVright, wpUp );
	CalcEntitySpot( ent, SPOT_WEAPON, wpMuzzle );
	return (WP_FireThermalDetonator( ent, qfalse ));
}

//------------------------------------
void Seeker_Fire( void )
{
	vec3_t		dir, enemy_org, muzzle;
	gentity_t	*missile;

	CalcEntitySpot( NPCS.NPC->enemy, SPOT_HEAD, enemy_org );
	VectorSubtract( enemy_org, NPCS.NPC->r.currentOrigin, dir );
	VectorNormalize( dir );

	// move a bit forward in the direction we shall shoot in so that the bolt doesn't poke out the other side of the seeker
	VectorMA( NPCS.NPC->r.currentOrigin, 15, dir, muzzle );

	missile = CreateMissile( muzzle, dir, 1000, 10000, NPCS.NPC, qfalse );

	G_PlayEffectID( G_EffectIndex("blaster/muzzle_flash"), NPCS.NPC->r.currentOrigin, dir );

	missile->classname = "blaster";
	missile->s.weapon = WP_BLASTER;

	missile->damage = 5;
	missile->dflags = DAMAGE_DEATH_KNOCKBACK;
	missile->methodOfDeath = MOD_BLASTER;
	missile->clipmask = MASK_SHOT | CONTENTS_LIGHTSABER;
	if ( NPCS.NPC->r.ownerNum < ENTITYNUM_NONE )
	{
		missile->r.ownerNum = NPCS.NPC->r.ownerNum;
	}
}

//Entity to position
qboolean G_ClearLOS( gentity_t *self, gentity_t *ent, const vec3_t end )
{
	vec3_t	eyes;

	CalcEntitySpot( ent, SPOT_HEAD_LEAN, eyes );

	return G_ClearLOS( self, eyes, end );
}

/*
-------------------------
ImperialProbe_FireBlaster
-------------------------
*/
void ImperialProbe_FireBlaster(void)
{
	vec3_t	muzzle1,enemy_org1,delta1,angleToEnemy1;
	static	vec3_t	forward, vright, up;
//	static	vec3_t	muzzle;
	int genBolt1;
	gentity_t	*missile;
	mdxaBone_t	boltMatrix;

	genBolt1 = trap_G2API_AddBolt(NPC->ghoul2, 0, "*flash");

	//FIXME: use {0, NPC->client->ps.legsYaw, 0}
	trap_G2API_GetBoltMatrix( NPC->ghoul2, 0, 
				genBolt1,
				&boltMatrix, NPC->r.currentAngles, NPC->r.currentOrigin, level.time,
				NULL, NPC->modelScale );

	BG_GiveMeVectorFromMatrix( &boltMatrix, ORIGIN, muzzle1 );

	G_PlayEffectID( G_EffectIndex("bryar/muzzle_flash"), muzzle1, vec3_origin );

	G_Sound( NPC, CHAN_AUTO, G_SoundIndex( "sound/chars/probe/misc/fire" ));

	if (NPC->health)
	{
		CalcEntitySpot( NPC->enemy, SPOT_CHEST, enemy_org1 );
		enemy_org1[0]+= Q_irand(0,10);
		enemy_org1[1]+= Q_irand(0,10);
		VectorSubtract (enemy_org1, muzzle1, delta1);
		vectoangles ( delta1, angleToEnemy1 );
		AngleVectors (angleToEnemy1, forward, vright, up);
	}
	else
	{
		AngleVectors (NPC->r.currentAngles, forward, vright, up);
	}

	missile = CreateMissile( muzzle1, forward, 1600, 10000, NPC, qfalse );

	missile->classname = "bryar_proj";
	missile->s.weapon = WP_BRYAR_PISTOL;

	if ( g_spskill.integer <= 1 )
	{
		missile->damage = 5;
	}
	else 
	{
		missile->damage = 10;
	}


	missile->dflags = DAMAGE_DEATH_KNOCKBACK;
	missile->methodOfDeath = MOD_UNKNOWN;
	missile->clipmask = MASK_SHOT | CONTENTS_LIGHTSABER;

}

qboolean NPC_FaceEntity( gentity_t *ent, qboolean doPitch )
{
	vec3_t		entPos;

	//Get the positions
	CalcEntitySpot( ent, SPOT_HEAD_LEAN, entPos );

	return NPC_FacePosition( entPos, doPitch );
}

//NPC's eyes to entity
qboolean G_ClearLOS4( gentity_t *self, gentity_t *ent ) 
{
	vec3_t	eyes;

	//Calculate my position
	CalcEntitySpot( self, SPOT_HEAD_LEAN, eyes );
	
	return G_ClearLOS3( self, eyes, ent );
}

qboolean InVisrange ( gentity_t *ent )
{//FIXME: make a calculate visibility for ents that takes into account
	//lighting, movement, turning, crouch/stand up, other anims, hide brushes, etc.
	vec3_t	eyes;
	vec3_t	spot;
	vec3_t	deltaVector;
	float	visrange = (NPCInfo->stats.visrange*NPCInfo->stats.visrange);

	CalcEntitySpot( NPC, SPOT_HEAD_LEAN, eyes );

	CalcEntitySpot( ent, SPOT_ORIGIN, spot );
	VectorSubtract ( spot, eyes, deltaVector);

	/*if(ent->client)
	{
		float	vel, avel;
		if(ent->client->ps.velocity[0] || ent->client->ps.velocity[1] || ent->client->ps.velocity[2])
		{
			vel = VectorLength(ent->client->ps.velocity);
			if(vel > 128)
			{
				visrange += visrange * (vel/256);
			}
		}

		if(ent->avelocity[0] || ent->avelocity[1] || ent->avelocity[2])
		{//FIXME: shouldn't they need to have line of sight to you to detect this?
			avel = VectorLength(ent->avelocity);
			if(avel > 15)
			{
				visrange += visrange * (avel/60);
			}
		}
	}*/

	if(VectorLengthSquared(deltaVector) > visrange)
	{
		return qfalse;
	}

	return qtrue;
}

/*
-------------------------
ImperialProbe_FireBlaster
-------------------------
*/
void ImperialProbe_FireBlaster(void)
{
	vec3_t	muzzle1,enemy_org1,delta1,angleToEnemy1;
	static	vec3_t	forward, vright, up;
	static	vec3_t	muzzle;
	gentity_t	*missile;
	mdxaBone_t	boltMatrix;

	//FIXME: use {0, NPC->client->ps.legsYaw, 0}
	gi.G2API_GetBoltMatrix( NPC->ghoul2, NPC->playerModel, 
				NPC->genericBolt1,
				&boltMatrix, NPC->currentAngles, NPC->currentOrigin, (cg.time?cg.time:level.time),
				NULL, NPC->s.modelScale );

	gi.G2API_GiveMeVectorFromMatrix( boltMatrix, ORIGIN, muzzle1 );

	G_PlayEffect( "bryar/muzzle_flash", muzzle1 );

	G_Sound( NPC, G_SoundIndex( "sound/chars/probe/misc/fire" ));

	if (NPC->health)
	{
		CalcEntitySpot( NPC->enemy, SPOT_CHEST, enemy_org1 );
		enemy_org1[0]+= Q_irand(0,10);
		enemy_org1[1]+= Q_irand(0,10);
		VectorSubtract (enemy_org1, muzzle1, delta1);
		vectoangles ( delta1, angleToEnemy1 );
		AngleVectors (angleToEnemy1, forward, vright, up);
	}
	else
	{
		AngleVectors (NPC->currentAngles, forward, vright, up);
	}

	missile = CreateMissile( muzzle1, forward, 1600, 10000, NPC );

	missile->classname = "bryar_proj";
	missile->s.weapon = WP_BRYAR_PISTOL;

	if ( g_spskill->integer <= 1 )
	{
		missile->damage = 5;
	}
	else 
	{
		missile->damage = 10;
	}


	missile->dflags = DAMAGE_DEATH_KNOCKBACK;
	missile->methodOfDeath = MOD_ENERGY;
	missile->clipmask = MASK_SHOT | CONTENTS_LIGHTSABER;

}

int G_CheckAlertEvents( gentity_t *self, qboolean checkSight, qboolean checkSound, float maxSeeDist, float maxHearDist, int ignoreAlert, qboolean mustHaveOwner, int minAlertLevel )
{
	int bestSoundEvent = -1;
	int bestSightEvent = -1;
	int bestSoundAlert = -1;
	int bestSightAlert = -1;

	if ( &g_entities[0] == NULL || g_entities[0].health <= 0 )
	{
		//player is dead
		return -1;
	}

	//get sound event
	bestSoundEvent = G_CheckSoundEvents( self, maxHearDist, ignoreAlert, mustHaveOwner, minAlertLevel );
	//get sound event alert level
	if ( bestSoundEvent >= 0 )
	{
		bestSoundAlert = level.alertEvents[bestSoundEvent].level;
	}

	//get sight event
	if ( self->NPC )
	{
		bestSightEvent = G_CheckSightEvents( self, self->NPC->stats.hfov, self->NPC->stats.vfov, maxSeeDist, ignoreAlert, mustHaveOwner, minAlertLevel );
	}
	else
	{
		bestSightEvent = G_CheckSightEvents( self, 80, 80, maxSeeDist, ignoreAlert, mustHaveOwner, minAlertLevel );//FIXME: look at cg_view to get more accurate numbers?
	}
	//get sight event alert level
	if ( bestSightEvent >= 0 )
	{
		bestSightAlert = level.alertEvents[bestSightEvent].level;
	}

	//return the one that has a higher alert (or sound if equal)
	//FIXME:	This doesn't take the distance of the event into account

	if ( bestSightEvent >= 0 && bestSightAlert > bestSoundAlert )
	{//valid best sight event, more important than the sound event
		//get the light level of the alert event for this checker
		vec3_t	eyePoint, sightDir;
		//get eye point
		CalcEntitySpot( self, SPOT_HEAD_LEAN, eyePoint );
		VectorSubtract( level.alertEvents[bestSightEvent].position, eyePoint, sightDir );
		level.alertEvents[bestSightEvent].light = level.alertEvents[bestSightEvent].addLight + G_GetLightLevel( level.alertEvents[bestSightEvent].position, sightDir );
		//return the sight event
		return bestSightEvent;
	}
	//return the sound event
	return bestSoundEvent;
}

static void Sniper_CheckFireState( void )
{
	if ( enemyCS )
	{//if have a clear shot, always try
		return;
	}

	if ( NPCInfo->squadState == SQUAD_RETREAT || NPCInfo->squadState == SQUAD_TRANSITION || NPCInfo->squadState == SQUAD_SCOUT )
	{//runners never try to fire at the last pos
		return;
	}

	if ( !VectorCompare( NPC->client->ps.velocity, vec3_origin ) )
	{//if moving at all, don't do this
		return;
	}

	if ( !TIMER_Done( NPC, "taunting" ) )
	{//no shoot while taunting
		return;
	}

	//continue to fire on their last position
	if ( !Q_irand( 0, 1 ) 
		&& NPCInfo->enemyLastSeenTime 
		&& level.time - NPCInfo->enemyLastSeenTime < ((5-NPCInfo->stats.aim)*1000) )//FIXME: incorporate skill too?
	{
		if ( !VectorCompare( vec3_origin, NPCInfo->enemyLastSeenLocation ) )
		{
			//Fire on the last known position
			vec3_t	muzzle, dir, angles;

			CalcEntitySpot( NPC, SPOT_WEAPON, muzzle );
			VectorSubtract( NPCInfo->enemyLastSeenLocation, muzzle, dir );

			VectorNormalize( dir );

			vectoangles( dir, angles );

			NPCInfo->desiredYaw		= angles[YAW];
			NPCInfo->desiredPitch	= angles[PITCH];

			shoot = qtrue;
			//faceEnemy = qfalse;
		}
		return;
	}
	else if ( level.time - NPCInfo->enemyLastSeenTime > 10000 )
	{//next time we see him, we'll miss few times first
		NPC->count = 0;
	}
}