DesertBiome.cs

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using Microsoft.Xna.Framework;
using Newtonsoft.Json;
using Terraria.GameContent.Biomes.Desert;
using Terraria.WorldBuilding;
 
namespace Terraria.GameContent.Biomes;
 
public class DesertBiome : MicroBiome
{
    [JsonProperty("ChanceOfEntrance")]
    public double ChanceOfEntrance = 0.3333;
 
    public override bool Place(Point origin, StructureMap structures)
    {
        DesertDescription desertDescription = DesertDescription.CreateFromPlacement(origin);
        if (!desertDescription.IsValid)
        {
            return false;
        }
        ExportDescriptionToEngine(desertDescription);
        SandMound.Place(desertDescription);
        desertDescription.UpdateSurfaceMap();
        if (!Main.tenthAnniversaryWorld && GenBase._random.NextDouble() <= ChanceOfEntrance)
        {
            switch (GenBase._random.Next(4))
            {
            case 0:
                ChambersEntrance.Place(desertDescription);
                break;
            case 1:
                AnthillEntrance.Place(desertDescription);
                break;
            case 2:
                LarvaHoleEntrance.Place(desertDescription);
                break;
            case 3:
                PitEntrance.Place(desertDescription);
                break;
            }
        }
        DesertHive.Place(desertDescription);
        CleanupArea(desertDescription.Hive);
        Rectangle area = new Rectangle(desertDescription.CombinedArea.X, 50, desertDescription.CombinedArea.Width, desertDescription.CombinedArea.Bottom - 20);
        structures.AddStructure(area, 10);
        return true;
    }
 
    private static void ExportDescriptionToEngine(DesertDescription description)
    {
        GenVars.UndergroundDesertLocation = description.CombinedArea;
        GenVars.UndergroundDesertLocation.Inflate(10, 10);
        GenVars.UndergroundDesertHiveLocation = description.Hive;
    }
 
    private static void CleanupArea(Rectangle area)
    {
        for (int i = -20 + area.Left; i < area.Right + 20; i++)
        {
            for (int j = -20 + area.Top; j < area.Bottom + 20; j++)
            {
                if (i > 0 && i < Main.maxTilesX - 1 && j > 0 && j < Main.maxTilesY - 1)
                {
                    WorldGen.SquareWallFrame(i, j);
                    WorldUtils.TileFrame(i, j, frameNeighbors: true);
                }
            }
        }
    }
}