ModShapes.cs

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using Microsoft.Xna.Framework;
using Terraria.DataStructures;
 
namespace Terraria.WorldBuilding;
 
public static class ModShapes
{
    public class All : GenModShape
    {
        public All(ShapeData data)
            : base(data)
        {
        }
 
        public override bool Perform(Point origin, GenAction action)
        {
            foreach (Point16 datum in _data.GetData())
            {
                if (!UnitApply(action, origin, datum.X + origin.X, datum.Y + origin.Y) && _quitOnFail)
                {
                    return false;
                }
            }
            return true;
        }
    }
 
    public class OuterOutline : GenModShape
    {
        private static readonly int[] POINT_OFFSETS = new int[16]
        {
            1, 0, -1, 0, 0, 1, 0, -1, 1, 1,
            1, -1, -1, 1, -1, -1
        };
 
        private bool _useDiagonals;
 
        private bool _useInterior;
 
        public OuterOutline(ShapeData data, bool useDiagonals = true, bool useInterior = false)
            : base(data)
        {
            _useDiagonals = useDiagonals;
            _useInterior = useInterior;
        }
 
        public override bool Perform(Point origin, GenAction action)
        {
            int num = (_useDiagonals ? 16 : 8);
            foreach (Point16 datum in _data.GetData())
            {
                if (_useInterior && !UnitApply(action, origin, datum.X + origin.X, datum.Y + origin.Y) && _quitOnFail)
                {
                    return false;
                }
                for (int i = 0; i < num; i += 2)
                {
                    if (!_data.Contains(datum.X + POINT_OFFSETS[i], datum.Y + POINT_OFFSETS[i + 1]) && !UnitApply(action, origin, origin.X + datum.X + POINT_OFFSETS[i], origin.Y + datum.Y + POINT_OFFSETS[i + 1]) && _quitOnFail)
                    {
                        return false;
                    }
                }
            }
            return true;
        }
    }
 
    public class InnerOutline : GenModShape
    {
        private static readonly int[] POINT_OFFSETS = new int[16]
        {
            1, 0, -1, 0, 0, 1, 0, -1, 1, 1,
            1, -1, -1, 1, -1, -1
        };
 
        private bool _useDiagonals;
 
        public InnerOutline(ShapeData data, bool useDiagonals = true)
            : base(data)
        {
            _useDiagonals = useDiagonals;
        }
 
        public override bool Perform(Point origin, GenAction action)
        {
            int num = (_useDiagonals ? 16 : 8);
            foreach (Point16 datum in _data.GetData())
            {
                bool flag = false;
                for (int i = 0; i < num; i += 2)
                {
                    if (!_data.Contains(datum.X + POINT_OFFSETS[i], datum.Y + POINT_OFFSETS[i + 1]))
                    {
                        flag = true;
                        break;
                    }
                }
                if (flag && !UnitApply(action, origin, datum.X + origin.X, datum.Y + origin.Y) && _quitOnFail)
                {
                    return false;
                }
            }
            return true;
        }
    }
}