1

game/server/weight_button.cpp

@@ -0,0 +1,102 @@
+
+//========= Copyright Valve Corporation, All rights reserved. ============//
+//
+// Purpose: 'Button' which activates after a specified amount of weight is touching it.
+//
+//=============================================================================//
+
+#include "cbase.h"
+
+class CWeightButton : public CBaseEntity
+{
+public:
+
+	DECLARE_DATADESC();
+	DECLARE_CLASS( CWeightButton, CBaseEntity ); 
+
+	void Spawn( void );
+	bool CreateVPhysics( void );
+
+	COutputEvent m_OnPressed;				// After threshold weight has been reached
+	COutputEvent m_OnReleased;				// After weight has been removed to go below weight threshold
+
+	float m_fStressToActivate;				// Amount of weight required to activate
+	bool m_bHasBeenPressed;					// Once the button has been pressed, fire one 
+											// output until the weight is reduced below the threshold
+
+	void TriggerThink ( void );
+
+};
+
+LINK_ENTITY_TO_CLASS( func_weight_button, CWeightButton );
+
+BEGIN_DATADESC( CWeightButton )
+
+	DEFINE_KEYFIELD( m_fStressToActivate, FIELD_FLOAT, "WeightToActivate" ),
+	DEFINE_FIELD( m_bHasBeenPressed, FIELD_BOOLEAN ),
+
+	DEFINE_OUTPUT( m_OnPressed, "OnPressed" ),
+	DEFINE_OUTPUT( m_OnReleased, "OnReleased" ),
+	
+	DEFINE_THINKFUNC( TriggerThink ),
+
+END_DATADESC()
+
+
+void CWeightButton::Spawn()
+{
+	BaseClass::Spawn();
+
+	// Convert movedir from angles to a vector
+	SetMoveType( MOVETYPE_VPHYSICS );
+	SetSolid( SOLID_VPHYSICS );
+ 	SetModel( STRING( GetModelName() ) );
+	CreateVPhysics();
+	SetThink( &CWeightButton::TriggerThink );
+	SetNextThink( gpGlobals->curtime + TICK_INTERVAL );
+	m_bHasBeenPressed = false;
+}
+
+//-----------------------------------------------------------------------------
+// Purpose: Create VPhysics collision for this entity
+//-----------------------------------------------------------------------------
+bool CWeightButton::CreateVPhysics()
+{
+	VPhysicsInitShadow( false, false );
+	return true;
+}
+
+
+//-----------------------------------------------------------------------------
+// Purpose: Every second, check total stress and fire an output if we have reached 
+//			our threshold. If the stress is relieved below our threshold, fire a different output.
+//-----------------------------------------------------------------------------
+void CWeightButton::TriggerThink( void )
+{
+	vphysics_objectstress_t vpobj_StressOut;
+	IPhysicsObject* pMyPhysics = VPhysicsGetObject();
+
+	if ( !pMyPhysics )
+	{
+		SetNextThink( TICK_NEVER_THINK );
+		return;
+	}
+
+ 	float fStress = CalculateObjectStress( pMyPhysics, this, &vpobj_StressOut );
+
+//	fStress = vpobj_StressOut.receivedStress;
+
+	if ( fStress > m_fStressToActivate && !m_bHasBeenPressed )
+	{
+		m_OnPressed.FireOutput( this, this );
+		m_bHasBeenPressed = true;
+	}
+	else if ( fStress < m_fStressToActivate && m_bHasBeenPressed )
+	{
+		m_OnReleased.FireOutput( this, this );
+		m_bHasBeenPressed = false;
+	}
+
+	// think every tick
+	SetNextThink( gpGlobals->curtime + TICK_INTERVAL );
+}