74 lines
2.5 KiB
C++
74 lines
2.5 KiB
C++
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//========= Copyright <20> 1996-2005, Valve Corporation, All rights reserved. ============//
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//
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// Purpose:
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//
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//=============================================================================//
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#include "cbase.h"
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#include "particles_attractor.h"
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#include "tier0/memdbgon.h"
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//-----------------------------------------------------------------------------
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// Purpose:
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// Input : ¢er -
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// "attractor" -
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// Output : CParticleAttractor
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//-----------------------------------------------------------------------------
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CParticleAttractor *CParticleAttractor::Create( const Vector ¢er, const char *pDebugName )
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{
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CParticleAttractor *pSystem = new CParticleAttractor( pDebugName );
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pSystem->SetAttractorOrigin( center );
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return pSystem;
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}
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//-----------------------------------------------------------------------------
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// Purpose:
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// Input : *pParticle -
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// timeDelta -
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//-----------------------------------------------------------------------------
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void CParticleAttractor::UpdateVelocity( SimpleParticle *pParticle, float timeDelta )
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{
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float speed = VectorNormalize( pParticle->m_vecVelocity );
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Vector offset;
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Vector dir = ( m_vecAttractorOrigin - pParticle->m_Pos );
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VectorNormalize( dir );
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speed = clamp( (speed+speed*0.2f), 0, 1024 );
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pParticle->m_vecVelocity += dir * speed;
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}
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//-----------------------------------------------------------------------------
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// Purpose:
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// Input : *pParticle -
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// timeDelta -
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// Output : float
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//-----------------------------------------------------------------------------
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float CParticleAttractor::UpdateScale( const SimpleParticle *pParticle )
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{
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return ( ((float)pParticle->m_uchStartSize) * sin( M_PI * (pParticle->m_flLifetime / pParticle->m_flDieTime) ) );
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}
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//-----------------------------------------------------------------------------
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// Purpose:
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// Input : *pParticle -
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// timeDelta -
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// Output : float
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//-----------------------------------------------------------------------------
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float CParticleAttractor::UpdateAlpha( const SimpleParticle *pParticle )
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{
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return ( ((float)pParticle->m_uchStartAlpha/255.0f) * sin( M_PI * (pParticle->m_flLifetime / pParticle->m_flDieTime) ) );
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}
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//-----------------------------------------------------------------------------
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// Purpose:
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// Input : &origin -
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//-----------------------------------------------------------------------------
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void CParticleAttractor::SetAttractorOrigin( const Vector &origin )
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{
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m_vecAttractorOrigin = origin;
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}
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