source-engine/game/server/hl2/grenade_energy.cpp

//========= Copyright Valve Corporation, All rights reserved. ============//
//
// Purpose: Projectile shot by mortar synth.
//
// $NoKeywords: $
//=============================================================================//

#include "cbase.h"
#include "grenade_energy.h"
#include "soundent.h"
#include "player.h"
#include "hl2_shareddefs.h"

// memdbgon must be the last include file in a .cpp file!!!
#include "tier0/memdbgon.h"

#define	 ENERGY_GRENADE_LIFETIME 1

ConVar    sk_dmg_energy_grenade		( "sk_dmg_energy_grenade","0");
ConVar	  sk_energy_grenade_radius	( "sk_energy_grenade_radius","0");

BEGIN_DATADESC( CGrenadeEnergy )

	DEFINE_FIELD( m_flMaxFrame,	  FIELD_INTEGER ),
	DEFINE_FIELD( m_nEnergySprite, FIELD_INTEGER ),
	DEFINE_FIELD( m_flLaunchTime, FIELD_TIME ),		

	// Function pointers
	DEFINE_FUNCTION( Animate ),
	DEFINE_FUNCTION( GrenadeEnergyTouch ),

END_DATADESC()

LINK_ENTITY_TO_CLASS( grenade_energy, CGrenadeEnergy );

void CGrenadeEnergy::Spawn( void )
{
	Precache( );
	SetSolid( SOLID_BBOX );
	SetMoveType( MOVETYPE_FLY );

	SetModel( "Models/weapons/w_energy_grenade.mdl" );

	SetUse( DetonateUse );
	SetTouch( GrenadeEnergyTouch );
	SetNextThink( gpGlobals->curtime + 0.1f );

	m_flDamage			= sk_dmg_energy_grenade.GetFloat();
	m_DmgRadius		= sk_energy_grenade_radius.GetFloat();
	m_takedamage	= DAMAGE_YES;
	m_iHealth		= 1;

	m_flCycle		= 0;
	m_flLaunchTime	= gpGlobals->curtime;

	SetCollisionGroup( HL2COLLISION_GROUP_HOUNDEYE ); 

	UTIL_SetSize( this, vec3_origin, vec3_origin );

	m_flMaxFrame = (float) modelinfo->GetModelFrameCount( GetModel() ) - 1;

}

//------------------------------------------------------------------------------
// Purpose :
// Input   :
// Output  :
//------------------------------------------------------------------------------
void CGrenadeEnergy::Shoot( CBaseEntity* pOwner, const Vector &vStart, Vector vVelocity )
{
	CGrenadeEnergy *pEnergy = (CGrenadeEnergy *)CreateEntityByName( "grenade_energy" );
	pEnergy->Spawn();
	
	UTIL_SetOrigin( pEnergy, vStart );
	pEnergy->SetAbsVelocity( vVelocity );
	pEnergy->SetOwnerEntity( pOwner );

	pEnergy->SetThink ( Animate );
	pEnergy->SetNextThink( gpGlobals->curtime + 0.1f );

	pEnergy->m_nRenderMode = kRenderTransAdd;
	pEnergy->SetRenderColor( 160, 160, 160, 255 );
	pEnergy->m_nRenderFX = kRenderFxNone;
}

//------------------------------------------------------------------------------
// Purpose :
// Input   :
// Output  :
//------------------------------------------------------------------------------
void CGrenadeEnergy::Animate( void )
{
	float flLifeLeft = 1-(gpGlobals->curtime  - m_flLaunchTime)/ENERGY_GRENADE_LIFETIME;

	if (flLifeLeft < 0)
	{
		SetRenderColorA( 0 );
		SetThink(NULL);
		UTIL_Remove(this);
	}

	SetNextThink( gpGlobals->curtime + 0.01f );

	QAngle angles;
	VectorAngles( GetAbsVelocity(), angles );
	SetLocalAngles( angles );

	SetNextThink( gpGlobals->curtime + 0.1f );

	StudioFrameAdvance( );

	SetRenderColorA( flLifeLeft );
}

void CGrenadeEnergy::Event_Killed( const CTakeDamageInfo &info )
{
	Detonate( );
}

void CGrenadeEnergy::GrenadeEnergyTouch( CBaseEntity *pOther )
{
	if ( pOther->m_takedamage )
	{
		float flLifeLeft = 1-(gpGlobals->curtime  - m_flLaunchTime)/ENERGY_GRENADE_LIFETIME;

		if ( pOther->GetFlags() & (FL_CLIENT) )
		{
			CBasePlayer *pPlayer = ( CBasePlayer * )pOther;
			float		flKick	 = 120 * flLifeLeft;
			pPlayer->m_Local.m_vecPunchAngle.SetX( flKick * (random->RandomInt(0,1) == 1) ? -1 : 1 );
			pPlayer->m_Local.m_vecPunchAngle.SetY( flKick * (random->RandomInt(0,1) == 1) ? -1 : 1 );
		}
		float flDamage = m_flDamage * flLifeLeft;
		if (flDamage < 1) 
		{
			flDamage = 1;
		}

		trace_t tr;
		tr = GetTouchTrace();
		CTakeDamageInfo info( this, GetThrower(), m_flDamage * flLifeLeft, DMG_SONIC );
		CalculateMeleeDamageForce( &info, (tr.endpos - tr.startpos), tr.endpos );
		pOther->TakeDamage( info );
	}
	Detonate();
}

void CGrenadeEnergy::Detonate(void)
{
	m_takedamage	= DAMAGE_NO;	
	UTIL_Remove( this );
}

void CGrenadeEnergy::Precache( void )
{
	PrecacheModel("Models/weapons/w_energy_grenade.mdl");
}