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287 lines
8.2 KiB
C++
287 lines
8.2 KiB
C++
//========= Copyright Valve Corporation, All rights reserved. ============//
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//
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// Purpose:
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//
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// $NoKeywords: $
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//
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//=============================================================================//
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#include "cbase.h"
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#include "ivp_actuator.hxx"
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#include "ivp_actuator_spring.hxx"
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#include "ivp_listener_object.hxx"
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// memdbgon must be the last include file in a .cpp file!!!
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#include "tier0/memdbgon.h"
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struct vphysics_save_cphysicsspring_t : public springparams_t
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{
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CPhysicsObject *pObjStart;
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CPhysicsObject *pObjEnd;
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DECLARE_SIMPLE_DATADESC();
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};
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BEGIN_SIMPLE_DATADESC( vphysics_save_cphysicsspring_t )
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DEFINE_FIELD( constant, FIELD_FLOAT ),
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DEFINE_FIELD( naturalLength, FIELD_FLOAT ),
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DEFINE_FIELD( damping, FIELD_FLOAT ),
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DEFINE_FIELD( relativeDamping, FIELD_FLOAT ),
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// NOTE: These are stored as *relative* vectors, so we don't use FIELD_POSITION_VECTOR
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DEFINE_FIELD( startPosition, FIELD_VECTOR ),
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DEFINE_FIELD( endPosition, FIELD_VECTOR ),
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DEFINE_FIELD( useLocalPositions, FIELD_BOOLEAN ),
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DEFINE_FIELD( onlyStretch, FIELD_BOOLEAN ),
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DEFINE_VPHYSPTR( pObjStart ),
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DEFINE_VPHYSPTR( pObjEnd ),
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END_DATADESC()
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// BUGBUG: No way to delete a spring because springs get auto-deleted without notification
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// when an object they are attached to is deleted.
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// So there is no way to tell if the pointer is valid.
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class CPhysicsSpring : public IPhysicsSpring, public IVP_Listener_Object
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{
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public:
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CPhysicsSpring( CPhysicsObject *pObjectStart, CPhysicsObject *pObjectEnd, IVP_Actuator_Spring *pSpring );
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~CPhysicsSpring();
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// IPhysicsSpring
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void GetEndpoints( Vector* worldPositionStart, Vector* worldPositionEnd );
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void SetSpringConstant( float flSpringContant);
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void SetSpringDamping( float flSpringDamping);
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void SetSpringLength( float flSpringLength);
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IPhysicsObject *GetStartObject( void ) { return m_pObjStart; }
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IPhysicsObject *GetEndObject( void ) { return m_pObjEnd; }
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void AttachListener();
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void DetachListener();
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// Object listener
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virtual void event_object_deleted( IVP_Event_Object *);
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virtual void event_object_created( IVP_Event_Object *) {}
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virtual void event_object_revived( IVP_Event_Object *) {}
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virtual void event_object_frozen ( IVP_Event_Object *) {}
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void WriteToTemplate( vphysics_save_cphysicsspring_t ¶ms );
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private:
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CPhysicsSpring( void );
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IVP_Actuator_Spring *m_pSpring;
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CPhysicsObject *m_pObjStart;
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CPhysicsObject *m_pObjEnd;
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};
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CPhysicsSpring::CPhysicsSpring( CPhysicsObject *pObjectStart, CPhysicsObject *pObjectEnd, IVP_Actuator_Spring *pSpring ) : m_pSpring(pSpring)
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{
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m_pObjStart = pObjectStart;
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m_pObjEnd = pObjectEnd;
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AttachListener();
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}
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void CPhysicsSpring::AttachListener()
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{
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if ( !(m_pObjStart->CallbackFlags() & CALLBACK_NEVER_DELETED) )
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{
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m_pObjStart->GetObject()->add_listener_object( this );
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}
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if ( !(m_pObjEnd->CallbackFlags() & CALLBACK_NEVER_DELETED) )
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{
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m_pObjEnd->GetObject()->add_listener_object( this );
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}
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}
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CPhysicsSpring::~CPhysicsSpring()
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{
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if ( m_pSpring )
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{
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delete m_pSpring;
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DetachListener();
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}
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}
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void CPhysicsSpring::DetachListener()
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{
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if ( !(m_pObjStart->CallbackFlags() & CALLBACK_NEVER_DELETED) )
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{
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m_pObjStart->GetObject()->remove_listener_object( this );
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}
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if ( !(m_pObjEnd->CallbackFlags() & CALLBACK_NEVER_DELETED) )
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{
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m_pObjEnd->GetObject()->remove_listener_object( this );
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}
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m_pObjStart = NULL;
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m_pObjEnd = NULL;
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m_pSpring = NULL;
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}
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void CPhysicsSpring::event_object_deleted( IVP_Event_Object * )
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{
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// the spring is going to delete itself now, so NULL it.
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DetachListener();
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}
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void CPhysicsSpring::GetEndpoints( Vector* worldPositionStart, Vector* worldPositionEnd )
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{
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Vector localHL;
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if ( !m_pSpring )
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return;
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if ( worldPositionStart )
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{
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const IVP_Anchor *anchor = m_pSpring->get_actuator_anchor(0);
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ConvertPositionToHL( anchor->object_pos, localHL );
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m_pObjStart->LocalToWorld( worldPositionStart, localHL );
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}
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if ( worldPositionEnd )
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{
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const IVP_Anchor *anchor = m_pSpring->get_actuator_anchor(1);
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ConvertPositionToHL( anchor->object_pos, localHL );
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m_pObjEnd->LocalToWorld( worldPositionEnd, localHL );
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}
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}
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void CPhysicsSpring::SetSpringConstant( float flSpringConstant )
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{
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if ( m_pSpring )
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{
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float currentConstant = m_pSpring->get_constant();
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if ( currentConstant != flSpringConstant )
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{
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m_pSpring->set_constant(flSpringConstant);
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}
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}
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}
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void CPhysicsSpring::SetSpringDamping( float flSpringDamping )
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{
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if ( m_pSpring )
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{
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m_pSpring->set_damp(flSpringDamping);
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}
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}
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void CPhysicsSpring::SetSpringLength( float flSpringLength )
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{
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if ( m_pSpring )
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{
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float currentLengthIVP = m_pSpring->get_spring_length_zero_force();
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float desiredLengthIVP = ConvertDistanceToIVP(flSpringLength);
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// must change enough, or skip to keep objects sleeping
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const float SPRING_LENGTH_EPSILON = 1e-3f;
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if ( fabs(desiredLengthIVP-currentLengthIVP) < ConvertDistanceToIVP(SPRING_LENGTH_EPSILON) )
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return;
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m_pSpring->set_len( desiredLengthIVP );
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}
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}
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void CPhysicsSpring::WriteToTemplate( vphysics_save_cphysicsspring_t ¶ms )
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{
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if ( !m_pSpring )
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{
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memset(¶ms, 0, sizeof(params));
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return;
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}
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params.constant = m_pSpring->get_constant();
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params.naturalLength = ConvertDistanceToHL( m_pSpring->get_spring_length_zero_force() );
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params.damping = m_pSpring->get_damp_factor();
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params.relativeDamping = m_pSpring->get_rel_pos_damp();
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const IVP_Anchor *anchor0 = m_pSpring->get_actuator_anchor(0);
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ConvertPositionToHL( anchor0->object_pos, params.startPosition );
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const IVP_Anchor *anchor1 = m_pSpring->get_actuator_anchor(1);
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ConvertPositionToHL( anchor1->object_pos, params.endPosition );
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params.useLocalPositions = true;
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params.onlyStretch = m_pSpring->get_only_stretch() ? true : false;
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params.pObjStart = m_pObjStart;
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params.pObjEnd = m_pObjEnd;
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}
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IPhysicsSpring *CreateSpring( IVP_Environment *pEnvironment, CPhysicsObject *pObjectStart, CPhysicsObject *pObjectEnd, springparams_t *pParams )
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{
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// fill in template
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IVP_Template_Spring spring_template;
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spring_template.spring_values_are_relative=IVP_FALSE;
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spring_template.spring_constant = pParams->constant;
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spring_template.spring_len = ConvertDistanceToIVP( pParams->naturalLength );
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spring_template.spring_damp = pParams->damping;
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spring_template.rel_pos_damp = pParams->relativeDamping;
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spring_template.spring_force_only_on_stretch = pParams->onlyStretch ? IVP_TRUE : IVP_FALSE;
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// Create anchors for the objects
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IVP_Template_Anchor anchorTemplateObjectStart, anchorTemplateObjectEnd;
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// create spring
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IVP_U_Float_Point ivpPosStart;
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IVP_U_Float_Point ivpPosEnd;
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if ( !pParams->useLocalPositions )
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{
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Vector local;
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pObjectStart->WorldToLocal( &local, pParams->startPosition );
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ConvertPositionToIVP( local, ivpPosStart );
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pObjectEnd->WorldToLocal( &local, pParams->endPosition );
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ConvertPositionToIVP( local, ivpPosEnd );
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}
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else
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{
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ConvertPositionToIVP( pParams->startPosition, ivpPosStart );
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ConvertPositionToIVP( pParams->endPosition, ivpPosEnd );
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}
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anchorTemplateObjectStart.set_anchor_position_os( pObjectStart->GetObject(), &ivpPosStart );
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anchorTemplateObjectEnd.set_anchor_position_os( pObjectEnd->GetObject(), &ivpPosEnd );
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spring_template.anchors[0] = &anchorTemplateObjectStart;
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spring_template.anchors[1] = &anchorTemplateObjectEnd;
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IVP_Actuator_Spring *pSpring = pEnvironment->create_spring( &spring_template );
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return new CPhysicsSpring( pObjectStart, pObjectEnd, pSpring );
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}
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bool SavePhysicsSpring( const physsaveparams_t ¶ms, CPhysicsSpring *pSpring )
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{
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vphysics_save_cphysicsspring_t springTemplate;
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memset( &springTemplate, 0, sizeof(springTemplate) );
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pSpring->WriteToTemplate( springTemplate );
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params.pSave->WriteAll( &springTemplate );
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return true;
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}
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bool RestorePhysicsSpring( const physrestoreparams_t ¶ms, CPhysicsSpring **ppSpring )
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{
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vphysics_save_cphysicsspring_t springTemplate;
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memset( &springTemplate, 0, sizeof(springTemplate) );
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params.pRestore->ReadAll( &springTemplate );
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CPhysicsEnvironment *pEnvironment = (CPhysicsEnvironment *)params.pEnvironment;
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if ( springTemplate.pObjStart && springTemplate.pObjEnd )
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{
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*ppSpring = (CPhysicsSpring *)pEnvironment->CreateSpring( springTemplate.pObjStart, springTemplate.pObjEnd, &springTemplate );
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}
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else
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{
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DevMsg( "Failed to restore spring enpoints\n");
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*ppSpring = NULL;
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}
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return true;
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}
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