Making a weapon that heal players

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Purpose

Here i will show you how to make weapons heal Players, useful for class based mods/games.

Constructor

First of all add this to your weapon constructor.

m_bDropped = 0; // this is to make sure the medic drops it one at a time

Primaryfire

This right here is working code that launches one health vial per single fire.

    if (!m_bDropped) { // if it hasnt been dropped...
#ifndef CLIENT_DLL
      CBasePlayer *pPlayer = ToBasePlayer( GetOwner() ); // get the player

      Vector   vecEye = pPlayer->EyePosition(); // Get the eye vector
      Vector   vForward, vRight; // create 2 new vectors

      pPlayer->EyeVectors( &vForward, &vRight, NULL );  // so we know what direction forward is
      Vector vecSrc = vecEye + vForward * 18.0f + vRight * 8.0f; // do some crazy math to find the source for our spawning

      trace_t tr; // we need a trace

      UTIL_TraceHull( vecEye, vecSrc, -Vector(6,6,6), Vector(6,6,6),
         pPlayer->PhysicsSolidMaskForEntity(), pPlayer, pPlayer->GetCollisionGroup(), &tr ); // to make sure we can spawn it without it being in anything else
      
      if ( tr.DidHit() ) // if we hit...
      {
         vecSrc = tr.endpos; // than something happens
      }

   //   CheckThrowPosition( pPlayer, vecEye, vecSrc );
   //   vForward[0] += 0.1f;
      vForward[2] += 0.1f; // something else

      Vector vecThrow;
      AngleVectors( pPlayer->EyeAngles() + pPlayer->GetPunchAngle(), &vecThrow ); // get the vector fo the impulse on our health vial
      // pPlayer->GetVelocity( &vecThrow, NULL );
      VectorScale( vecThrow, 1000.0f, vecThrow ); // scale it down
      // vecThrow += vForward * 1200;

      CBaseEntity *pVial = NULL; // null and then!

      pVial = CBaseEntity::Create( "item_healthvial", pPlayer->Weapon_ShootPosition(), QAngle(80,60,0), pPlayer ); create that shit!
      pVial->AddSpawnFlags(SF_NORESPAWN); // DONT LET IT RESPAWN!
      if (!pVial) // have to have created it for it to be thrown
      {
         DevMsg("unable to create item\n");
      }else // YEA BIZZNATCH
      {
         DevMsg(2, "Starting item throw (Server)\n");

         IPhysicsObject *pPhysicsObject = pVial->VPhysicsGetObject(); // get the physics object
         if ( pPhysicsObject )
         {
            DevMsg(2, "Throwing item (Server)\n");
            pPhysicsObject->SetVelocity( &vecThrow, NULL );// throw that fuckin thing.
            
         }
      }
      m_bDropped = 1; // change the flag...
#endif
   } else {
      DevMsg(2, "Already dropped one. Release the button. (Server)\n"); // damnit gotta let go of that button.
   }

ItemPostFrame

We will add this to the itempostframe in the weapon.

if (!((pOwner->m_nButtons & IN_ATTACK) || (pOwner->m_nButtons & IN_ATTACK2) || (pOwner->m_nButtons & IN_RELOAD)))
   {
      m_bDropped = 0;
   }

Secondary Fire

If a player is too close from the medic/gun will health the player too.

//-----------------------------------------------------------------------------
// Purpose:
//-----------------------------------------------------------------------------
void CWeaponHealer::SecondaryAttack( void )
{
   if (CanHealPlayer())
      HealPlayer();
}

bool CWeaponHealer::CanHealPlayer( void )
{
   if (!m_bFired){
      CHL2MP_Player *pOwner = ToHL2MPPlayer( GetOwner() );

      if (!pOwner)
      {
         return false;
      }

      Vector vecSrc, vecAiming;

      // Take the eye position and direction
      vecSrc = pOwner->EyePosition();
      
      QAngle angles = pOwner->GetLocalAngles();

      AngleVectors( angles, &vecAiming );

      trace_t tr;

      Vector   vecEnd = vecSrc + (vecAiming * 42);
      UTIL_TraceLine( vecSrc, vecEnd, MASK_SOLID, pOwner, COLLISION_GROUP_NONE, &tr );
      
      if (tr.fraction < 1.0)
      {
         // Don\'t attach to a living creature
         if (tr.m_pEnt)
         {
            CBaseEntity *pEntity = tr.m_pEnt;
            CBaseCombatCharacter *pBCC      = ToBaseCombatCharacter( pEntity );
            if (pBCC)
            {
               if (pBCC->GetHealth()<100)
                  return true;
            }
         }
         return false;
      }
      else
      {
         return false;
      }
   }else {return false;}
}
bool CWeaponHealer::HealPlayer( void )
{
   m_bFired = 1;

   CHL2MP_Player *pOwner = ToHL2MPPlayer( GetOwner() );

   if (!pOwner)
   {
      return false;
   }

   Vector vecSrc, vecAiming;

   // Take the eye position and direction
   vecSrc = pOwner->EyePosition();
   
   QAngle angles = pOwner->GetLocalAngles();

   AngleVectors( angles, &vecAiming );

   trace_t tr;

   Vector   vecEnd = vecSrc + (vecAiming * 42);
   UTIL_TraceLine( vecSrc, vecEnd, MASK_SOLID, pOwner, COLLISION_GROUP_NONE, &tr );
   
   if (tr.fraction < 1.0)
   {
      // Don\'t attach to a living creature
      if (tr.m_pEnt)
      {
         CBaseEntity *pEntity = tr.m_pEnt;
         if (pEntity->IsPlayer())
         {
            if (pEntity->GetHealth()<pEntity->GetMaxHealth())
            {
#ifndef CLIENT_DLL
               CBasePlayer *pPlayer = ToBasePlayer(pEntity);

               CPASAttenuationFilter filter( pPlayer, "HealthVial.Touch" );
               EmitSound( filter, pPlayer->entindex(), "HealthVial.Touch" );
               pEntity->TakeHealth( 20, DMG_GENERIC );
#endif
               return true;
            }
         }
      }
      return false;
   }
   else
   {
      return false;
   }
}