AnchoredEntitiesCollection.cs

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using System.Collections.Generic;
using Microsoft.Xna.Framework;
 
namespace Terraria.DataStructures;
 
public class AnchoredEntitiesCollection
{
    private struct IndexPointPair
    {
        public int index;
 
        public Point coords;
    }
 
    private List<IndexPointPair> _anchoredNPCs;
 
    private List<IndexPointPair> _anchoredPlayers;
 
    public int AnchoredPlayersAmount => _anchoredPlayers.Count;
 
    public AnchoredEntitiesCollection()
    {
        _anchoredNPCs = new List<IndexPointPair>();
        _anchoredPlayers = new List<IndexPointPair>();
    }
 
    public void ClearNPCAnchors()
    {
        _anchoredNPCs.Clear();
    }
 
    public void ClearPlayerAnchors()
    {
        _anchoredPlayers.Clear();
    }
 
    public void AddNPC(int npcIndex, Point coords)
    {
        _anchoredNPCs.Add(new IndexPointPair
        {
            index = npcIndex,
            coords = coords
        });
    }
 
    public int GetNextPlayerStackIndexInCoords(Point coords)
    {
        return GetEntitiesInCoords(coords);
    }
 
    public void AddPlayerAndGetItsStackedIndexInCoords(int playerIndex, Point coords, out int stackedIndexInCoords)
    {
        stackedIndexInCoords = GetEntitiesInCoords(coords);
        _anchoredPlayers.Add(new IndexPointPair
        {
            index = playerIndex,
            coords = coords
        });
    }
 
    private int GetEntitiesInCoords(Point coords)
    {
        int num = 0;
        for (int i = 0; i < _anchoredNPCs.Count; i++)
        {
            if (_anchoredNPCs[i].coords == coords)
            {
                num++;
            }
        }
        for (int j = 0; j < _anchoredPlayers.Count; j++)
        {
            if (_anchoredPlayers[j].coords == coords)
            {
                num++;
            }
        }
        return num;
    }
}