SCR_PrefabsSpawner.c

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[BaseContainerProps()]
class SCR_PrefabsSpawner
{
    [Attribute("0", UIWidgets.EditComboBox, "Defines which spawner uses this Spawn Point", "", ParamEnumArray.FromEnum(EPrefabSpawnType))]
    protected EPrefabSpawnType m_eType;
    
    [Attribute("0", uiwidget: UIWidgets.Flags, "Game Flags required to spawn contained prefabs.", "", ParamEnumArray.FromEnum(EGameFlags))]
    protected EGameFlags m_eRequiredGameFlags;
    
    [Attribute("50", UIWidgets.Slider, "Percentage of how many prefabs to spawn based on how many SCR_PrefabSpawnPoints(with defined type) exists in Mission.", "0 100")]
    protected int m_iTotalPrefabs;
    
    [Attribute("", UIWidgets.Object, "Add categories of prefabs and/or specific prefabs to spawn.")]
    protected ref array<ref SCR_BasePrefabCategory> m_aPrefabsCategories;

    protected ref array<SCR_PrefabSpawnPoint> m_aPrefabSpawnPoints;
    
    //------------------------------------------------------------------------------------------------
    EPrefabSpawnType GetType()
    {
        return m_eType;
    }
    
    //------------------------------------------------------------------------------------------------
    void Spawn(array<SCR_PrefabSpawnPoint> prefabSpawnPoints)
    {
        if (m_eRequiredGameFlags != 0 && !GetGame().AreGameFlagsSet(m_eRequiredGameFlags))
            return;
        
        if (prefabSpawnPoints == null)
        {
            Debug.Error("Can't spawn items of type: " + m_eType.ToString() + " because no spawn points are available.");
            return;
        }
        
        m_aPrefabSpawnPoints = prefabSpawnPoints;
        
        int numberOfPrefabsToSpawn = m_aPrefabSpawnPoints.Count() * m_iTotalPrefabs * 0.01;
        SpawnPrefabsCategories(numberOfPrefabsToSpawn, m_aPrefabsCategories);
    }
    
    //------------------------------------------------------------------------------------------------
    void SpawnPrefabsCategories(int numberOfPrefabsToSpawn, array<ref SCR_BasePrefabCategory> prefabsCategories)
    {
        int totalRatio = GetTotalRatio(prefabsCategories);
        
        if (totalRatio == 0)
            return;
        
        foreach (SCR_BasePrefabCategory prefabCategory : prefabsCategories)
        {
            prefabCategory.Spawn(numberOfPrefabsToSpawn * prefabCategory.GetRatio() / totalRatio, this);
        }
    }
    
    //------------------------------------------------------------------------------------------------
    void SpawnPrefabCategory(int totalprefabs, ResourceName prefab)
    {
        if (totalprefabs <= 0 || m_aPrefabSpawnPoints == null)
            return;
        
        for (int i = 0; i < totalprefabs; i++)
        {
            SCR_PrefabSpawnPoint prefabSpawnPoint = m_aPrefabSpawnPoints.GetRandomElement();
            m_aPrefabSpawnPoints.RemoveItem(prefabSpawnPoint);
            
            vector mat[4];
            prefabSpawnPoint.GetWorldTransform(mat);
            
            if (prefabSpawnPoint.ShouldSnapToGround())
            {
                vector position = mat[3];
                position[1] = prefabSpawnPoint.GetWorld().GetSurfaceY(position[0], position[2]);
                mat[3] = position;
            }
                
            EntitySpawnParams spawnParams = new EntitySpawnParams();
            spawnParams.TransformMode = ETransformMode.WORLD;
            spawnParams.Transform = mat;
            
            Resource resource = Resource.Load(prefab);
            if (resource.IsValid())
                GetGame().SpawnEntityPrefab(resource, null, spawnParams);
        }
    }
    
    //------------------------------------------------------------------------------------------------
    protected int GetTotalRatio(array<ref SCR_BasePrefabCategory> prefabsCategories)
    {
        int totalWeight = 0;
        foreach (SCR_BasePrefabCategory prefabCategory : prefabsCategories)
        {
            totalWeight += prefabCategory.GetRatio();
        }
        
        return totalWeight;
    }
}