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game/client/tf2/c_entity_burn_effect.cpp

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+//========= Copyright Valve Corporation, All rights reserved. ============//
+//
+// Purpose: 
+//
+// $NoKeywords: $
+//=============================================================================//
+#include "cbase.h"
+#include "c_entity_burn_effect.h"
+
+
+#define NUM_BURN_PARTICLES_PER_SEC	50
+
+
+
+IMPLEMENT_CLIENTCLASS_DT( C_EntityBurnEffect, DT_EntityBurnEffect, CEntityBurnEffect )
+	RecvPropInt( RECVINFO( m_hBurningEntity ) )
+END_RECV_TABLE()
+
+
+
+C_EntityBurnEffect::C_EntityBurnEffect()
+{
+	m_pEmitter = CSimpleEmitter::Create( "Entity burn effect" );
+	if ( m_pEmitter.IsValid() )
+	{
+		m_hFireMaterial = m_pEmitter->GetPMaterial( "particle/fire" );
+	}
+	else
+	{
+		m_hFireMaterial = INVALID_MATERIAL_HANDLE;
+	}
+	m_Timer.Init( NUM_BURN_PARTICLES_PER_SEC );
+}
+
+
+void C_EntityBurnEffect::OnDataChanged( DataUpdateType_t updateType )
+{
+	if ( updateType == DATA_UPDATE_CREATED )
+	{
+		SetNextClientThink( CLIENT_THINK_ALWAYS );
+	}
+}
+
+
+void C_EntityBurnEffect::ClientThink()
+{
+	if ( !m_pEmitter.IsValid() || IsDormant() )
+		return;
+
+	// Add some burning particles to our target entity.
+	C_BaseEntity *pEnt = ClientEntityList().GetBaseEntity( m_hBurningEntity );
+	if ( !pEnt )
+		return;
+
+	float dt = gpGlobals->frametime;
+	while ( m_Timer.NextEvent( dt ) )
+	{
+		Vector vDims = (pEnt->WorldAlignMaxs() - pEnt->WorldAlignMins()) * 0.5f;
+		Vector vCenter = pEnt->GetAbsOrigin() + pEnt->WorldAlignMins() + vDims;
+		Vector vPos = vCenter + vDims * RandomVector( -0.7, 0.7 );
+
+		float flLifetime = 1;
+		float flRadius = 3;
+		unsigned char uchColor[4] = { 255, 100, 0, 100 };
+
+		SimpleParticle *pParticle = m_pEmitter->AddSimpleParticle( m_hFireMaterial, vPos, flLifetime, flRadius );
+		if ( pParticle )
+		{
+			pParticle->m_uchColor[0] = uchColor[0];
+			pParticle->m_uchColor[1] = uchColor[1];
+			pParticle->m_uchColor[2] = uchColor[2];
+
+			pParticle->m_uchEndAlpha = 0;
+			pParticle->m_uchStartAlpha = uchColor[3];
+
+			pParticle->m_vecVelocity.x = RandomFloat( -2, 2 );
+			pParticle->m_vecVelocity.y = RandomFloat( -2, 2 );
+			pParticle->m_vecVelocity.z = RandomFloat( 3, 29 );
+
+			// Pick up some velocity from the burning guy running around.
+			pParticle->m_vecVelocity += pEnt->GetAbsVelocity() * 0.6;
+		}
+	}
+}
+