DebrisBuildingEntity.c

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[EntityEditorProps(category: "GameScripted/Debris", description: "Entity used to represent a large piece of debris from a collapsing building.", dynamicBox: true)]
class SCR_DebrisBuildingEntityClass: GenericEntityClass
{
};
 
//------------------------------------------------------------------------------------------------
class SCR_DebrisBuildingEntity : GenericEntity
{
    const static float RANDOM_INITIAL_LINEAR_VELOCITY_XZ = 0.5;
    const static float RANDOM_INITIAL_LINEAR_VELOCITY_Y = 1;
    const static float RANDOM_INITIAL_ANGULAR_VELOCITY = 3;
    const static float RANDOM_BUMP_DELAY_MIN = 0.5;
    const static float RANDOM_BUMP_DELAY_MAX = 2;
    const static float RANDOM_BUMP_HEIGHT_MAX = 15;
    const static float ANGULAR_VELOCITY_MAX = 30;
    
    protected SCR_BuildingSetup m_ParentBuildingSetup;
    protected int m_iBuildingRegion = 0;
    protected vector m_vLinearVelocity = vector.Zero;
    protected vector m_vAngularVelocity = vector.Zero;
    protected vector m_vCenter = vector.Zero;
    protected float m_fImpactPosY = 0;
    protected float m_fDebrisPosY = 0;
    protected float m_fDelayDeleteTime = 0;
    protected float m_fRandomBumpDelay = 0;
    protected bool m_bSpawnedDebris = false;
    
    //------------------------------------------------------------------------------------------------
    static SCR_DebrisBuildingEntity SpawnBuildingDebris(vector mat[4], SCR_BuildingSetup buildingSetup, int buildingRegion, IEntity ignoreEnt, string remap = "")
    {
        if (!buildingSetup)
            return null;
        
        ResourceName model = buildingSetup.GetDamagedRegionModel(buildingRegion);
        
        // Check if model is valid
        if (model == string.Empty)
            return null;
        
        Resource resource = Resource.Load(model);
        
        // Check if resource is valid
        if (!resource.IsValid())
            return null;
        
        SCR_DebrisBuildingEntity entity = SCR_DebrisBuildingEntity.Cast(GetGame().SpawnEntity(SCR_DebrisBuildingEntity));
        if (!entity)
            return null;
        
        entity.SetParentBuilding(buildingSetup);
        entity.SetTransform(mat);
        VObject obj = resource.GetResource().ToVObject();
        entity.SetObject(obj, remap);
        entity.m_vLinearVelocity = Vector(Math.RandomFloat(-RANDOM_INITIAL_LINEAR_VELOCITY_XZ, RANDOM_INITIAL_LINEAR_VELOCITY_XZ), Math.RandomFloat(-RANDOM_INITIAL_LINEAR_VELOCITY_Y, RANDOM_INITIAL_LINEAR_VELOCITY_Y), Math.RandomFloat(-RANDOM_INITIAL_LINEAR_VELOCITY_XZ, RANDOM_INITIAL_LINEAR_VELOCITY_XZ));
        entity.m_vAngularVelocity = Vector(Math.RandomFloat(-1, 1), Math.RandomFloat(-1, 1), Math.RandomFloat(-1, 1)) * RANDOM_INITIAL_ANGULAR_VELOCITY;
        entity.SetBuildingRegion(buildingRegion);
        
        vector mins, maxs;
        entity.GetBounds(mins, maxs);
        
        float regionVerticalSize = 3;
        
        entity.m_vCenter = (maxs - mins) * 0.5 + mins;
        regionVerticalSize = maxs[1] - mins[1];
        
        // Trace downward and find the impact pos
        vector center = entity.CoordToParent(entity.m_vCenter);
        autoptr TraceParam param = new TraceParam;
        param.Exclude = ignoreEnt;
        param.Start = center;
        param.End = param.Start - Vector(0, buildingSetup.m_fLargeDebrisDropMax, 0);
        param.Flags = TraceFlags.ENTS | TraceFlags.WORLD;
        entity.m_fImpactPosY = param.End[1] - regionVerticalSize;
        entity.m_fDebrisPosY = entity.m_fImpactPosY;
        
        float traced = entity.GetWorld().TraceMove(param, null);
        if (traced < 1)
        {
            entity.m_fDebrisPosY = (param.End[1] - param.Start[1]) * traced + param.Start[1];
            entity.m_fImpactPosY = entity.m_fDebrisPosY - regionVerticalSize;
        }
        
        return entity;
    }
    
    //------------------------------------------------------------------------------------------------
    void SetParentBuilding(SCR_BuildingSetup buildingSetup)
    {
        m_ParentBuildingSetup = buildingSetup;
    }
    
    //------------------------------------------------------------------------------------------------
    vector GetLinearVelocity()
    {
        return m_vLinearVelocity;
    }
    
    //------------------------------------------------------------------------------------------------
    vector GetAngularVelocity()
    {
        return m_vAngularVelocity;
    }
    
    //------------------------------------------------------------------------------------------------
    void SetLinearVelocity(vector vel)
    {
        m_vLinearVelocity = vel;
    }
    
    //------------------------------------------------------------------------------------------------
    void SetAngularVelocity(vector vel)
    {
        m_vAngularVelocity = vel;
    }
    
    //------------------------------------------------------------------------------------------------
    protected void SetBuildingRegion(int buildingRegion)
    {
        m_iBuildingRegion = buildingRegion;
    }
    
    //------------------------------------------------------------------------------------------------
    override protected void EOnFrame(IEntity owner, float timeSlice) //EntityEvent.FRAME
    {
        #ifdef BUILDING_DESTRUCTION_DEBUG
            if (Debug.KeyState(KeyCode.KC_SUBTRACT))
                timeSlice *= 0.1;
        #endif
        
        vector curMat[4];
        GetTransform(curMat);
        
        vector rotMat[3];
        Math3D.AnglesToMatrix(m_vAngularVelocity * timeSlice, rotMat);
        
        vector newMat[4];
        Math3D.MatrixMultiply3(curMat, rotMat, newMat);
        newMat[3] = curMat[3] + m_vLinearVelocity * timeSlice;
        
        SetTransform(newMat);
        vector center = CoordToParent(m_vCenter);
        
        float height = center[1];
        float heightAboveImpact = height - m_fImpactPosY;
        
        float gravityMult = 1;
        if (heightAboveImpact < RANDOM_BUMP_HEIGHT_MAX)
            gravityMult = 0.5;
        
        // Add gravity to fall
        m_vLinearVelocity += PhysicsWorld.GetGravity(GetGame().GetWorldEntity()) * timeSlice * gravityMult;
        
        // Add angular velocity, but don't increase if at maximum
        if (m_vAngularVelocity.LengthSq() < Math.Pow(ANGULAR_VELOCITY_MAX, 2))
            m_vAngularVelocity += m_vAngularVelocity * timeSlice;
        
        // Handle random "bumping", so simulate bouncing off surroundings
        m_fRandomBumpDelay -= timeSlice;
        if (m_fRandomBumpDelay <= 0 && heightAboveImpact > RANDOM_BUMP_HEIGHT_MAX)
        {
            m_fRandomBumpDelay = Math.RandomFloat(RANDOM_BUMP_DELAY_MIN, RANDOM_BUMP_DELAY_MAX);
            const float rndPosXZ = 1;
            const float rndPosYPctMin = 0.3;
            const float rndPosYPctMax = 0.9;
            const float rndAng = 2;
            m_vLinearVelocity += Vector(Math.RandomFloat(-rndPosXZ, rndPosXZ), Math.RandomFloat(rndPosYPctMin, rndPosYPctMax) * -m_vLinearVelocity[1], Math.RandomFloat(-rndPosXZ, rndPosXZ));
            m_vAngularVelocity += Vector(Math.RandomFloat(-rndAng, rndAng), Math.RandomFloat(-rndAng, rndAng), Math.RandomFloat(-rndAng, rndAng));
        }
        
        if (!m_bSpawnedDebris && height < m_fDebrisPosY)
        {
            m_bSpawnedDebris = true;
            if (m_ParentBuildingSetup)
                m_ParentBuildingSetup.SpawnDebrisForRegion(this, m_iBuildingRegion, m_vLinearVelocity, m_vAngularVelocity);
        }
        
        if (height > m_fImpactPosY)
            return;
        
        delete this;
    }
    
    //------------------------------------------------------------------------------------------------
    void SCR_DebrisBuildingEntity(IEntitySource src, IEntity parent)
    {
        SetEventMask(EntityEvent.INIT | EntityEvent.FRAME);
        SetFlags(EntityFlags.ACTIVE, true);
        
        m_fRandomBumpDelay = Math.RandomFloat(RANDOM_BUMP_DELAY_MIN, RANDOM_BUMP_DELAY_MAX);
    }
    
    //------------------------------------------------------------------------------------------------
    void ~SCR_DebrisBuildingEntity()
    {
        IEntity child = GetChildren();
        while (child)
        {
            delete child;
            child = GetChildren();
        }
    }
};