SpelunkerProjectileHelper.cs

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using System.Collections.Generic;
using Microsoft.Xna.Framework;
 
namespace Terraria.GameContent;
 
public class SpelunkerProjectileHelper
{
    private HashSet<Vector2> _positionsChecked = new HashSet<Vector2>();
 
    private HashSet<Point> _tilesChecked = new HashSet<Point>();
 
    private Rectangle _clampBox;
 
    private int _frameCounter;
 
    public void OnPreUpdateAllProjectiles()
    {
        _clampBox = new Rectangle(2, 2, Main.maxTilesX - 2, Main.maxTilesY - 2);
        if (++_frameCounter >= 10)
        {
            _frameCounter = 0;
            _tilesChecked.Clear();
            _positionsChecked.Clear();
        }
    }
 
    public void AddSpotToCheck(Vector2 spot)
    {
        if (_positionsChecked.Add(spot))
        {
            CheckSpot(spot);
        }
    }
 
    private void CheckSpot(Vector2 Center)
    {
        int num = (int)Center.X / 16;
        int num2 = (int)Center.Y / 16;
        int num3 = Utils.Clamp(num - 30, _clampBox.Left, _clampBox.Right);
        int num4 = Utils.Clamp(num + 30, _clampBox.Left, _clampBox.Right);
        int num5 = Utils.Clamp(num2 - 30, _clampBox.Top, _clampBox.Bottom);
        int num6 = Utils.Clamp(num2 + 30, _clampBox.Top, _clampBox.Bottom);
        Point item = default(Point);
        Vector2 position = default(Vector2);
        for (int i = num3; i <= num4; i++)
        {
            for (int j = num5; j <= num6; j++)
            {
                Tile tile = Main.tile[i, j];
                if (tile != null && tile.active() && Main.IsTileSpelunkable(tile) && !(new Vector2(num - i, num2 - j).Length() > 30f))
                {
                    item.X = i;
                    item.Y = j;
                    if (_tilesChecked.Add(item) && Main.rand.Next(4) == 0)
                    {
                        position.X = i * 16;
                        position.Y = j * 16;
                        Dust dust = Dust.NewDustDirect(position, 16, 16, 204, 0f, 0f, 150, default(Color), 0.3f);
                        dust.fadeIn = 0.75f;
                        dust.velocity *= 0.1f;
                        dust.noLight = true;
                    }
                }
            }
        }
    }
}