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73 lines
2.4 KiB
73 lines
2.4 KiB
//========= Copyright 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.f, 1024.f ); |
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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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