particle.c

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class Particle : ParticleBase
{
    protected   int     m_ParticleID;
    protected   float   m_Lifetime;
    protected   bool    m_IsRepeat;
    private     bool    m_MarkedForDeletion;
    
    bool                m_WiggleProcessing;
    bool                m_ForceOrientationRelativeToWorld;
    vector              m_DefaultOri;
    vector              m_DefaultPos;
    vector              m_DefaultWorldOri;
    vector              m_DefaultWorldPos;
    
    float               m_MaxOriWiggle;
    float               m_MaxOriInterval;
    ref Timer           m_RandomizeOri;
    
    protected Object    m_ParentObject;
    protected Object    m_ParticleEffect;
    
    protected int       m_PreviousFrame;
    private vector      m_GlobalPosPreviousFrame;
    static private const int MAX_EMITORS = 30;
    
    
    void Particle()
    {
        ParticleInit();
    }
    
    protected void ParticleInit()
    {
        SetFlags(EntityFlags.VISIBLE, true);
        SetEventMask(EntityEvent.INIT);
        SetEventMask(EntityEvent.FRAME);
    }   
    
    
    static Particle CreateOnObject( int particle_id, Object parent_obj, vector local_pos = "0 0 0", vector local_ori = "0 0 0", bool force_world_rotation = false )
    {
        if (!parent_obj)
            Error("ERROR when creating a particle! Parameter parent_obj is NULL!");
        
        vector global_pos = parent_obj.GetPosition();
        Particle p = CreateInWorld(particle_id, global_pos, Vector(0,0,0), force_world_rotation);
        p.AddAsChild(parent_obj, local_pos, local_ori, force_world_rotation);
        p.m_DefaultOri = local_ori;
        
        return p;
    }
    
    static Particle Create( int particle_id, Object parent_obj, vector local_pos = "0 0 0", vector local_ori = "0 0 0" )
    {
        return CreateOnObject( particle_id, parent_obj, local_pos, local_ori);
    }
    
    static Particle CreateInWorld( int particle_id, vector global_pos, vector global_ori = "0 0 0", bool force_world_rotation = false )
    {
        Particle p = Particle.Cast( GetGame().CreateObjectEx("Particle", global_pos, ECE_LOCAL) );
        p.SetSource(particle_id);
        p.SetOrientation(global_ori);
        p.m_ForceOrientationRelativeToWorld = force_world_rotation;
        return p;
    }
    
    static Particle Create( int particle_id, vector global_pos, vector global_ori = "0 0 0" )
    {
        return CreateInWorld( particle_id, global_pos, global_ori );
    }
    
    
    
    
    
    static Particle PlayOnObject( int particle_id, Object parent_obj, vector local_pos = "0 0 0", vector local_ori = "0 0 0", bool force_world_rotation = false )
    {
        Particle p = CreateOnObject(particle_id, parent_obj, local_pos, local_ori, force_world_rotation);
        p.PlayParticle();
        
        return p;
    }
    
    static Particle Play( int particle_id, Object parent_obj, vector local_pos = "0 0 0", vector local_ori = "0 0 0" )
    {
        return PlayOnObject( particle_id, parent_obj, local_pos, local_ori);
    }
    
    static Particle PlayInWorld( int particle_id, vector global_pos)
    {
        Particle p = CreateInWorld(particle_id, global_pos);
        p.PlayParticle();
        
        return p;
    }
 
    static Particle Play( int particle_id, vector global_pos)
    {
        return PlayInWorld( particle_id, global_pos);
    }
    
    
    
    
    
    override void PlayParticle(int particle_id = -1)
    {
        PlayParticleEx(particle_id, 0);
    }
    
    override bool PlayParticleEx(int particle_id = -1, int flags = 0)
    {
        if ( particle_id > -1 )
        {
            SetSource(particle_id);
        }
        
        OnParticleStart();
 
        UpdateState();
        
        return true;
    }
    
    void Play(int particle_id = -1)
    {
        PlayParticle(particle_id);
    }
    
    override bool StopParticle(int flags = 0)
    {
        OnParticleStop();       
        
        // Without the following we might get an error when a particle parent is despawned client-side.
        Object parent = Object.Cast( GetParent() );
        if ( parent && !ToDelete())
        {
            vector world_pos = GetPosition();
            parent.RemoveChild(this);
            SetPosition(world_pos);
        }
        
        UpdateState();
        
        return true;
    }
    
    void Stop()
    {
        StopParticle();
    }
    
    
    
    
    
    void SetSource(int particle_id)
    {
        m_ParticleID = particle_id;
    }
    
    int GetParticleID()
    {
        return m_ParticleID;
    }
    
    Object GetDirectParticleEffect()
    {
        return m_ParticleEffect;
    }
    
    Object GetParticleParent()
    {
        return m_ParentObject;
    }
    
    bool HasActiveParticle()
    {
        if (m_ParticleEffect)
        {
            return ParticleHasActive(m_ParticleEffect);
        }
        
        return false;
    }
    
    int GetParticleCount()
    {
        if (m_ParticleEffect)
        {
            return ParticleGetCount(m_ParticleEffect);
        }
        
        return 0;
    }
    
    bool IsRepeat()
    {
        if (m_ParticleEffect)
        {
            bool repeat = false;
            
            int emitors = GetParticleEmitorCount(m_ParticleEffect);
            
            for (int i = 0; i < emitors; ++i)
            {
                GetParticleParm(m_ParticleEffect, i, EmitorParam.REPEAT, repeat);
                
                if (repeat)
                {
                    return true;
                }
            }
        }
        
        return false;
    }
    
    float GetMaxLifetime()
    {
        float lifetime_return = 0;
        
        if (m_ParticleEffect)
        {
            float lifetime_min = 0;
            float lifetime_random = 0;          
            float effect_time = 0;
            
            float lifetime_sum = 0;
            
            int emitors = GetParticleEmitorCount(m_ParticleEffect);
            
            for (int i = 0; i < emitors; ++i)
            {
                GetParticleParm(m_ParticleEffect, i, EmitorParam.LIFETIME, lifetime_min);
                GetParticleParm(m_ParticleEffect, i, EmitorParam.LIFETIME_RND, lifetime_random);
                GetParticleParm(m_ParticleEffect, i, EmitorParam.EFFECT_TIME, effect_time);
                
                lifetime_sum = lifetime_min + lifetime_random + effect_time;
                
                if ( lifetime_sum > lifetime_return )
                {
                    lifetime_return = lifetime_sum;
                }
            }
        }
        
        return lifetime_return;
    }
    
    
    
    
    
    protected void UpdateState()
    {
        if ( m_IsPlaying == false && m_ParticleEffect)
        {
            DestroyParticleEffect();
        }
        else if ( m_IsPlaying == true && m_ParticleEffect == null )
        {
            CreateParticleEffect();
        }
    }
    
    private void CreateParticleEffect()
    {
        if ( !GetGame().IsServer() || !GetGame().IsMultiplayer() )
        {
            string fullPath = ParticleList.GetParticleFullPath(m_ParticleID);
            if (fullPath == "")
            {
                ErrorEx("Could not play Particle as there is no valid particle id assigned.");
                m_IsPlaying = false;
                return;
            }
            
            if ( m_ParticleEffect == null )
            {
                m_ParticleEffect = GetGame().CreateObjectEx("#particlesourceenf", vector.Zero, ECE_LOCAL); // particle source must be lowercase!
            }
            
            AddChild(m_ParticleEffect, -1, m_ForceOrientationRelativeToWorld);
            
            vobject vobj = GetObject( fullPath );           
            m_ParticleEffect.SetObject(vobj, "");
            ReleaseObject(vobj);
            
            m_IsRepeat = IsRepeat();
            m_Lifetime = GetMaxLifetime();
        }
    }
    
    private void DestroyParticleEffect()
    {
        if ( m_ParticleEffect && GetGame() )
        {
            SetParameter(-1, EmitorParam.LIFETIME, 0);
            SetParameter(-1, EmitorParam.LIFETIME_RND, 0);
            SetParameter(-1, EmitorParam.REPEAT, 0);
            
            m_IsRepeat = false;
        }
    }
    
    override void EOnFrame(IEntity other, float timeSlice)
    {       
        m_Lifetime -= timeSlice;
        OnCheckAutoDelete();
    }
    
    void OnCheckAutoDelete()
    {
        if (m_Lifetime <= 0)
        {
            if (!m_MarkedForDeletion)
            {
                m_IsRepeat = IsRepeat(); // It is possible that the REPEAT flag was changed during lifetime, so it needs to be checked again.
                
                if ( m_IsRepeat )
                {
                    m_Lifetime = GetMaxLifetime();
                }
                else
                {
                    OnParticleStop();
                    
                    if ( GetParticleCount() == 0 )
                    {
                        m_MarkedForDeletion = true;
                        OnToDelete();
                        OnParticleEnd();
                    }
                }
            }
            else
            {
                if ( m_MarkedForDeletion )
                {
                    if (m_ParticleEffect)
                    {
                        m_ParticleEffect.Delete();
                        m_ParticleEffect = null;
                    }
                    
                    Delete();
                }
            }
        }
    }
    
    private void OnToDelete()
    {
 
    }
    
    
    
    
    
    void AddAsChild(Object parent, vector local_pos = "0 0 0", vector local_ori = "0 0 0", bool force_rotation_to_world = false)
    {
        if (ToDelete())
            return;
        
        if (parent)
        {
            // AddAsChild method is sometimes called from a timer.
            // Due to that it is necesarry to use ToDelete() here to check if the parent object is flagged for deletion or not on client,
            // because sometimes this code is executed before the parent's destructor from where this would normally be handled.
            if (!parent.ToDelete())
            {
                SetPosition(local_pos);
                SetOrientation(local_ori);
                m_ParentObject = parent;
                m_DefaultPos = local_pos;
                m_ForceOrientationRelativeToWorld = force_rotation_to_world;
                
                if (m_ParticleEffect)
                    AddChild(m_ParticleEffect, -1, m_ForceOrientationRelativeToWorld);
                
                parent.AddChild(this, -1, false);
            }
        }
        else
        {
            if (m_ParentObject && !m_ParentObject.ToDelete())
            {
                m_ParentObject.RemoveChild(this, true);
                m_ParentObject = null;
            }
        }
    }
    
    
    
    
    
    void SetParticleParam(int parameter_id, float value )
    {
        if (!m_ParticleEffect)
            return;
        
        SetParticleParm(m_ParticleEffect, -1, parameter_id, value);
    }
    
    void SetParameter(int emitter, int parameter, float value)
    {
        if (!m_ParticleEffect)
            return;
        
        SetParticleParm(m_ParticleEffect, emitter, parameter, value);
    }
    
    void GetParameter(int emitter, int parameter, out float value)
    {
        if (!m_ParticleEffect)
            return;
        
        GetParticleParm(m_ParticleEffect, emitter, parameter, value);
    }
    
    float GetParameterEx(int emitter, int parameter)
    {
        if (!m_ParticleEffect)
            return 0;
        
        float value;
        GetParticleParm(m_ParticleEffect, emitter, parameter, value);
        return value;
    }
    
    void ScaleParticleParamFromOriginal(int parameter_id, float coef )
    {
        if (!m_ParticleEffect)
            return;
        
        int emitors = GetParticleEmitorCount(m_ParticleEffect);         
        for (int i = 0; i < emitors; ++i)
        {
            float value;
            GetParticleParmOriginal(m_ParticleEffect, i, parameter_id, value);
            SetParticleParm(m_ParticleEffect, i, parameter_id, value * coef);
        }
    }
    
    void ScaleParticleParam(int parameter_id, float coef )
    {
        if (!m_ParticleEffect)
            return;
        
        int emitors = GetParticleEmitorCount(m_ParticleEffect); 
        for (int i = 0; i < emitors; ++i)
        {
            float value;
            GetParticleParm(m_ParticleEffect, i, parameter_id, value);
            SetParticleParm(m_ParticleEffect, i, parameter_id, value * coef);
        }
    }
    
    void IncrementParticleParamFromOriginal(int parameter_id, float value )
    {
        if (!m_ParticleEffect)
            return;
        
        int emitors = GetParticleEmitorCount(m_ParticleEffect); 
        for (int i = 0; i < emitors; ++i)
        {
            float param;
            GetParticleParmOriginal(m_ParticleEffect, i, parameter_id, param);
            SetParticleParm(m_ParticleEffect, i, parameter_id, param + value);
        }
    }
    
    void IncrementParticleParam(int parameter_id, float value )
    {
        if (!m_ParticleEffect)
            return;
        
        int emitors = GetParticleEmitorCount(m_ParticleEffect); 
        for (int i = 0; i < emitors; ++i)
        {
            float param;
            GetParticleParm(m_ParticleEffect, i, parameter_id, param);
            SetParticleParm(m_ParticleEffect, i, parameter_id, param + value);
        }
    }
    
    
    
    
    
    bool IsWiggling()
    {
        return m_RandomizeOri && m_RandomizeOri.IsRunning();
    }
    
    void SetWiggle(float random_angle, float random_interval)
    {   
        if ( random_angle != 0 || random_interval != 0 )
        {   
            m_MaxOriWiggle = random_angle;
            m_MaxOriInterval = random_interval;
            
            if ( !m_RandomizeOri )
                m_RandomizeOri = new Timer( CALL_CATEGORY_GAMEPLAY );
            
            if ( !m_RandomizeOri.IsRunning() ) // Makes sure the timer is NOT running already
                m_RandomizeOri.Run( Math.RandomFloat(0, m_MaxOriInterval) , this, "RandomizeOrientation", null, false);
        }
        else
        {
            StopWiggle();
        }
    }
    
    void StopWiggle()
    {           
        if ( m_RandomizeOri )
        {
            m_RandomizeOri.Stop();
        }
        
        m_MaxOriWiggle = 0;
        m_MaxOriInterval = 0;
    }
    
    void RandomizeOrientation()
    {
        m_WiggleProcessing = true;
        
        if (m_ParentObject)
        {
            if ( !m_RandomizeOri.IsRunning() )
            {
                m_RandomizeOri.Run( Math.RandomFloat(0, m_MaxOriInterval) , this, "RandomizeOrientation", NULL, false);
            }
            
            Object old_parent = m_ParentObject;
            AddAsChild( null );
            AddAsChild( old_parent, m_DefaultPos, m_DefaultOri + RandWiggleVector() );
        }
        
        m_WiggleProcessing = false;
    }
    
    protected vector RandWiggleVector()
    {
        return Vector( RandWiggleFloat(), RandWiggleFloat(), RandWiggleFloat() );
    }
    
    protected float RandWiggleFloat()
    {
        return Math.RandomFloatInclusive(-m_MaxOriWiggle, m_MaxOriWiggle);
    }
    
}