Pyro auto-airblast

// Gets the flags for this projectile from a C_BaseEntity* 
// If it returns 0, it is not a projectile. 
int CAirblast::ProjFlags(C_BaseEntity *pProj) 
{ 
    switch (GetClassID(pProj)) 
    { 
    case CIDCTFStunBall: return ABF_STUNBALL; 
    case CIDCTFProjectile_Rocket: return ABF_ROCKET; 
    case CIDCTFGrenadePipebombProjectile: 
        { 
            dt_TFProjectile_Pipebomb dtProj(pProj); 
            if ( dtProj.iType()==PROJ_GRENADE ) 
                return (dtProj.bTouched())?ABF_BOUNCED:ABF_GRENADE; 
            else 
                return ABF_STICKY; 
        } 
    case CIDCTFProjectile_Arrow: return ABF_ARROW; 
    case CIDCTFProjectile_Flare: return ABF_FLARE; 
    case CIDCTFProjectile_Jar: return ABF_JARATE; 
    } 
    return 0; // Not a projectile 
} 
// Fires a simple ray and if it gets close enough it is considered visible. 
bool CAirblast::IsVisible(Vector &vPlayer, Vector &vProj) 
{ 
    if ( !g_pEngineTrace ) return true; 

    trace_t pTrace; 
    Ray_t pRay; 
    pRay.Init(vPlayer,vProj); 
    CTraceAirblast traceFilter; 
    g_pEngineTrace->TraceRay( pRay, MASK_AIRBLAST, &traceFilter, &pTrace ); 

    return pTrace.fraction>=0.99f; 
} 
// FOV test, you have to write your own CalcAngles(), ClampAngles() and InFov(). 
bool CAirblast::IsInFov(Vector &vPlayer, Vector &vProj) 
{ 
    QAngle qPlayer, qProj, qDiff; 
    g_pEngine->GetViewAngles(qPlayer); 
    CalcAngles(vPlayer, vProj, qProj); 
    qDiff = qPlayer-qProj; 
    ClampAngles(qDiff); 
    Msg("Diff = %f, %f\n", qDiff.x, qDiff.y); 
    return InFov(qDiff, 30.0f); 
} 
// Filter test, checks if the entity is not of your team and checks the flags of this projectile 
bool CAirblast::CProjFilter::Test(IClientEntity *ient) 
{ 
    C_BaseEntity *pEnt = static_cast<C_BaseEntity*>(ient); 
    return ((ProjFlags(pEnt)&m_fFlags) && pEnt->GetTeamNumber()!=m_iTeam); 
} 
// CTraceFilter, simple stuff. 
bool CAirblast::CTraceAirblast::ShouldHitEntity(IHandleEntity *pHandleEntity, int contentsMask) 
{ 
    C_BaseEntity *pEnt = static_cast<C_BaseEntity*>(pHandleEntity); 
    return !( GetClassID(pEnt)==CIDCTFPlayer || GetClassID(pEnt)==CIDCFuncRespawnRoomVisualizer ); 
}