Rotating Pickups/Code

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January 2024

Server

#include "cbase.h"
#include "items.h"

// memdbgon must be the last include file in a .cpp file!!!
#include "tier0/memdbgon.h"

#define PICKUP_DECAL "decals/item_base"
#define PICKUP_MODEL "models/items/healthkit.mdl"
#define PICKUP_MIN_HEIGHT 50
int PickupDecalIndex; // set by CRotatingPickup::Precache()

#define SF_SUPPRESS_PICKUP_DECAL	0x00000002

//-----------------------------------------------------------------------------
// Rotating health kit. Heals the player when picked up.
//-----------------------------------------------------------------------------
class CRotatingPickup : public CItem
{
	DECLARE_CLASS( CRotatingPickup, CItem );
	DECLARE_DATADESC();
	DECLARE_SERVERCLASS();
public:

	CRotatingPickup();

	void	Spawn();
	void	Activate();
	void	Precache();

	bool	MyTouch( CBasePlayer *pPlayer );

	CBaseEntity*	Respawn();
	void			Materialize();

	int	m_iHealthToGive;
	float m_fRespawnTime;
	CNetworkVar(bool, m_bRespawning);

private:
	Vector MdlTop;
};

LINK_ENTITY_TO_CLASS( item_rotating, CRotatingPickup );

PRECACHE_REGISTER( item_rotating );

BEGIN_DATADESC( CRotatingPickup )
	DEFINE_KEYFIELD( m_iHealthToGive, FIELD_INTEGER, "givehealth"),
	DEFINE_KEYFIELD( m_fRespawnTime, FIELD_FLOAT, "respawntime"),
END_DATADESC()

IMPLEMENT_SERVERCLASS_ST( CRotatingPickup, DT_RotatingPickup )
	SendPropBool( SENDINFO( m_bRespawning )),
	SendPropExclude( "DT_BaseEntity", "m_angRotation" ),
END_SEND_TABLE()

CRotatingPickup::CRotatingPickup()
{
	if ( m_iHealthToGive <= 0 )
		m_iHealthToGive = 25;

	if ( m_fRespawnTime <= 0 )
		m_fRespawnTime = 20;
}

void CRotatingPickup::Spawn()
{
	// CItem is designed for Vphys objects, so we need to undo a couple of things its spawn() does
	Vector OriginalLocation = GetAbsOrigin();
		BaseClass::Spawn();
	VPhysicsDestroyObject();
	SetAbsOrigin(OriginalLocation);

	UseClientSideAnimation();
	SetModel(PICKUP_MODEL);

	SetMoveType(MOVETYPE_NONE);

	// Grab the highest point on the model before we change the bounding box
	MdlTop = GetAbsOrigin();
	MdlTop.z += GetModelPtr()->hull_max().z;
			
	SetSolid(SOLID_NONE);
	CollisionProp()->UseTriggerBounds(true,6); // Reign in the volume added to the trigger collision box
	Vector OBBSize = Vector(CollisionProp()->OBBSize().Length() / 2); // need to use length as the model will be rotated at 45 degrees on clients
	SetSize(-OBBSize,OBBSize); // Resize the bounding box
	
	AddEffects(EF_NOSHADOW);	
}

void CRotatingPickup::Activate()
{
	BaseClass::Activate();

	// Ensure minimum distance above a standable surfare
	trace_t tr;
	UTIL_TraceLine(MdlTop,MdlTop + Vector(0,0,-PICKUP_MIN_HEIGHT),MASK_PLAYERSOLID,this,COLLISION_GROUP_NONE,&tr); // measuring from MdlTop
	if(tr.DidHit())
	{
		if ( !HasSpawnFlags( SF_SUPPRESS_PICKUP_DECAL ) )
			engine->StaticDecal(tr.endpos,PickupDecalIndex,0,0,false); // mark the location of the pickup
		SetAbsOrigin( GetAbsOrigin() + ( Vector(0,0,PICKUP_MIN_HEIGHT*(1-tr.fraction)) ) );
	}
}

void CRotatingPickup::Precache()
{
	PrecacheModel( PICKUP_MODEL );
	PrecacheScriptSound( "HealthKit.Touch" );
	PrecacheScriptSound( "AlyxEmp.Charge" );
	PickupDecalIndex = UTIL_PrecacheDecal(PICKUP_DECAL, true );
}

// Called from CItem::ItemTouch()
bool CRotatingPickup::MyTouch( CBasePlayer *pPlayer )
{
	if ( pPlayer && pPlayer->GetHealth() < pPlayer->GetMaxHealth() ) 
	{
		pPlayer->TakeHealth( m_iHealthToGive, DMG_GENERIC );
		
		CSingleUserRecipientFilter PlayerFilter( pPlayer );
		PlayerFilter.MakeReliable();

		UserMessageBegin( PlayerFilter, "ItemPickup" );
		WRITE_STRING( GetClassname() );
		MessageEnd();
		EmitSound( PlayerFilter, pPlayer->entindex(), "HealthKit.Touch" ); // this should be done by the HUD really

		Respawn();
		return true;
	}

	return false;
}

// Disappear
CBaseEntity* CRotatingPickup::Respawn()
{
	SetTouch(NULL);
	m_bRespawning = true;
	
	SetThink ( &CRotatingPickup::Materialize );
	SetNextThink( gpGlobals->curtime + m_fRespawnTime );

	return this;
}

// Reappear
void CRotatingPickup::Materialize()
{
	EmitSound("AlyxEmp.Charge");
	m_bRespawning = false;
	SetTouch(&CItem::ItemTouch);
}

Client

#include "cbase.h"

// memdbgon must be the last include file in a .cpp file!!!
#include "tier0/memdbgon.h"

#define ITEM_ROTATION_RATE	( 360.0f / 4.0f )
#define PICKUP_MIN_HEIGHT 50

//-----------------------------------------------------------------------------
// Rotating health kit. Heals the player when picked up.
//-----------------------------------------------------------------------------
class C_RotatingPickup : public C_BaseAnimating
{
	DECLARE_CLASS( C_RotatingPickup, C_BaseAnimating );
	DECLARE_CLIENTCLASS();
public:	
	C_RotatingPickup() {
		ClientRotAng = QAngle(45,0,0);
		m_bRespawning = m_bRespawning_Cache = false;
	}
	void Spawn() { ClientThink(); }

	bool IsRespawning();
	void ClientThink();
	void PostDataUpdate(DataUpdateType_t updateType);
	bool ShouldDraw();

	bool	m_bRespawning;
	bool	m_bRespawning_Cache;

private:
	QAngle		ClientRotAng; // m_angRotation is stomped sometimes (CItem returning the ent to spawn position?)
};

LINK_ENTITY_TO_CLASS( item_rotating, C_RotatingPickup );

IMPLEMENT_CLIENTCLASS_DT( C_RotatingPickup, DT_RotatingPickup,CRotatingPickup )
	RecvPropBool( RECVINFO(m_bRespawning) ),
END_RECV_TABLE()

inline bool C_RotatingPickup::IsRespawning()
{
	return m_bRespawning;
}

void C_RotatingPickup::ClientThink()
{
	if (IsAbsQueriesValid())
	{
		// Rotate
		ClientRotAng.y += ITEM_ROTATION_RATE * gpGlobals->frametime;
		if ( ClientRotAng.y >= 360 )
			ClientRotAng.y -= 360;

		SetAbsAngles( ClientRotAng );
	}

	SetNextClientThink(CLIENT_THINK_ALWAYS);
}

void C_RotatingPickup::PostDataUpdate(DataUpdateType_t updateType)
{
	if (m_bRespawning_Cache != m_bRespawning)
	{
		// Appear/disappear
		UpdateVisibility();
		ClientRotAng.y = 0;
		m_bRespawning_Cache = m_bRespawning;
	}

	return BaseClass::PostDataUpdate(updateType);
}

bool C_RotatingPickup::ShouldDraw()
{
	return !IsRespawning() && BaseClass::ShouldDraw();
}

FGD

@PointClass base(Item) studio("models/items/healthkit.mdl") = item_rotating: "A spinning health kit"
[
	givehealth(integer) : "Health to give" : 25
	respawntime(float) : "Respawn time" : 20
	
	spawnflags(Flags) =
	[
		2 : "Suppress location decal" : 0
	]
]

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January 2024