1 files changed, 161 insertions, 0 deletions
diff --git a/game/server/point_playermoveconstraint.cpp b/game/server/point_playermoveconstraint.cpp
new file mode 100644
index 0000000..df78487
--- /dev/null
+++ b/game/server/point_playermoveconstraint.cpp
@@ -0,0 +1,161 @@
+//========= Copyright Valve Corporation, All rights reserved. ============//
+//
+// Purpose: An entity that can be used to constrain the player's movement around it
+//
+//=============================================================================//
+
+#include "cbase.h"
+#include "saverestore_utlvector.h"
+
+// memdbgon must be the last include file in a .cpp file!!!
+#include "tier0/memdbgon.h"
+
+#define	SF_TELEPORT_TO_SPAWN_POS	0x00000001
+
+//-----------------------------------------------------------------------------
+// Purpose: 
+//-----------------------------------------------------------------------------
+class CPointPlayerMoveConstraint : public CBaseEntity
+{
+	DECLARE_CLASS( CPointPlayerMoveConstraint, CBaseEntity );
+public:
+	DECLARE_DATADESC();
+
+	int		UpdateTransmitState( void );
+	void	Activate( void );
+	void	ConstraintThink( void );
+
+	void	InputTurnOn( inputdata_t &inputdata );
+	void	InputTurnOff( inputdata_t &inputdata );
+
+private:
+	float				m_flRadius;	
+	float				m_flConstraintWidth;
+	float				m_flSpeedFactor;
+	float				m_flRadiusSquared;	
+	CUtlVector<EHANDLE>	m_hConstrainedPlayers;
+	COutputEvent		m_OnConstraintBroken;
+};
+
+LINK_ENTITY_TO_CLASS( point_playermoveconstraint, CPointPlayerMoveConstraint );
+
+BEGIN_DATADESC( CPointPlayerMoveConstraint )
+
+	DEFINE_KEYFIELD( m_flRadius, FIELD_FLOAT, "radius" ),
+	DEFINE_KEYFIELD( m_flConstraintWidth, FIELD_FLOAT, "width" ),
+	DEFINE_KEYFIELD( m_flSpeedFactor, FIELD_FLOAT, "speedfactor" ),
+	// DEFINE_FIELD( m_flRadiusSquared, FIELD_FLOAT ),		// Don't Save
+	DEFINE_UTLVECTOR( m_hConstrainedPlayers, FIELD_EHANDLE ),
+
+	DEFINE_THINKFUNC( ConstraintThink ),
+	DEFINE_INPUTFUNC( FIELD_VOID, "TurnOn", InputTurnOn ),
+	DEFINE_INPUTFUNC( FIELD_VOID, "TurnOff", InputTurnOff ),
+
+	DEFINE_OUTPUT( m_OnConstraintBroken, "OnConstraintBroken" ),
+
+END_DATADESC()
+
+//-----------------------------------------------------------------------------
+// Purpose: 
+//-----------------------------------------------------------------------------
+int CPointPlayerMoveConstraint::UpdateTransmitState()
+{
+	// ALWAYS transmit to all clients.
+	return SetTransmitState( FL_EDICT_ALWAYS );
+}
+
+//------------------------------------------------------------------------------
+// Purpose:
+//------------------------------------------------------------------------------
+void CPointPlayerMoveConstraint::Activate( void )
+{
+	BaseClass::Activate();
+
+	m_flRadiusSquared = (m_flRadius * m_flRadius);
+}
+
+//------------------------------------------------------------------------------
+// Purpose:
+//------------------------------------------------------------------------------
+void CPointPlayerMoveConstraint::InputTurnOn( inputdata_t &inputdata )
+{
+	// Find all players within our radius and constraint them
+	float flRadius = m_flRadius;
+	// If we're in singleplayer, blow the radius a bunch
+	if ( gpGlobals->maxClients == 1 )
+	{
+		flRadius = MAX_COORD_RANGE;
+	}
+	CBaseEntity *pEntity = NULL;
+	while ( (pEntity = gEntList.FindEntityByClassnameWithin( pEntity, "player", GetLocalOrigin(), flRadius)) != NULL )
+	{
+		CBasePlayer *pPlayer = ToBasePlayer( pEntity );
+		Assert( pPlayer );
+		
+		// Only add him if he's not already constrained
+		if ( m_hConstrainedPlayers.Find( pPlayer ) == m_hConstrainedPlayers.InvalidIndex() )
+		{
+			m_hConstrainedPlayers.AddToTail( pPlayer );
+
+			pPlayer->ActivateMovementConstraint( this, GetAbsOrigin(), m_flRadius, m_flConstraintWidth, m_flSpeedFactor );
+		}
+	}
+
+	// Only think if we found any
+	if ( m_hConstrainedPlayers.Count() )
+	{
+		SetThink( &CPointPlayerMoveConstraint::ConstraintThink );
+		SetNextThink( gpGlobals->curtime + 0.1f );
+	}
+}
+
+//------------------------------------------------------------------------------
+// Purpose: Release all players we've constrained
+//------------------------------------------------------------------------------
+void CPointPlayerMoveConstraint::InputTurnOff( inputdata_t &inputdata )
+{
+	int iCount = m_hConstrainedPlayers.Count();
+	for ( int i = 0; i < iCount; i++ )
+	{
+		CBasePlayer *pPlayer = ToBasePlayer( m_hConstrainedPlayers[i] );
+		if ( pPlayer )
+		{
+			pPlayer->DeactivateMovementConstraint();
+		}
+	}
+
+	m_hConstrainedPlayers.Purge();
+}
+
+//-----------------------------------------------------------------------------
+// Purpose: Check to see if any of our constrained players have broken the constraint
+//-----------------------------------------------------------------------------
+void CPointPlayerMoveConstraint::ConstraintThink( void )
+{
+	int iCount = m_hConstrainedPlayers.Count();
+
+	// Count backwards, because we might drop them if they've broken the constraint
+	for ( int i = (iCount-1); i >= 0; i-- )
+	{
+		CBasePlayer *pPlayer = ToBasePlayer( m_hConstrainedPlayers[i] );
+		if ( pPlayer )
+		{
+			float flDistanceSqr = (pPlayer->GetAbsOrigin() - GetAbsOrigin()).LengthSqr();
+			if ( flDistanceSqr > m_flRadiusSquared )
+			{
+				// Break the constraint to this player
+				pPlayer->DeactivateMovementConstraint();
+				m_hConstrainedPlayers.Remove(i);
+
+				// Fire the broken output
+				m_OnConstraintBroken.FireOutput( this, pPlayer );
+			}
+		}
+	}
+
+	// Only keep thinking if we any left
+	if ( m_hConstrainedPlayers.Count() )
+	{
+		SetNextThink( gpGlobals->curtime + 0.1f );
+	}
+}