MarchingSquares.cs

using System.Numerics;
using Raylib_cs;
using static Raylib_cs.Raylib;

namespace MarchingSquares;

static class MarchingSquares {
    // Run the marching squares algorithm on the given list
    public static List<Tuple<Vector2, Vector2>> Run(Point[,] Points, int X1, int Y1, int X2, int Y2) {
        var LineSegments = new List<Tuple<Vector2, Vector2>>();

        for (int x = X1; x < X2 - 1; x++) {
            for (int y = Y1; y < Y2 - 1; y++) {
                var A = new Vector2(x + 0.5f, y);
                var B = new Vector2(x + 1, y + 0.5f);
                var C = new Vector2(x + 0.5f, y + 1);
                var D = new Vector2(x, y + 0.5f);

                var State = GetState(
                    Points[x, y].Value,
                    Points[x + 1, y].Value,
                    Points[x + 1, y + 1].Value,
                    Points[x, y + 1].Value
                );

                switch (State) {
                    case 1:
                        LineSegments.Add(new Tuple<Vector2, Vector2>(D, C));
                        break;
                    case 2:
                        LineSegments.Add(new Tuple<Vector2, Vector2>(C, B));
                        break;
                    case 3:
                        LineSegments.Add(new Tuple<Vector2, Vector2>(D, B));
                        break;
                    case 4:
                        LineSegments.Add(new Tuple<Vector2, Vector2>(B, A));
                        break;
                    case 5:
                        LineSegments.Add(new Tuple<Vector2, Vector2>(D, A));
                        LineSegments.Add(new Tuple<Vector2, Vector2>(C, B));
                        break;
                    case 6:
                        LineSegments.Add(new Tuple<Vector2, Vector2>(C, A));
                        break;
                    case 7:
                        LineSegments.Add(new Tuple<Vector2, Vector2>(D, A));
                        break;
                    case 8:
                        LineSegments.Add(new Tuple<Vector2, Vector2>(A, D));
                        break;
                    case 9:
                        LineSegments.Add(new Tuple<Vector2, Vector2>(A, C));
                        break;
                    case 10:
                        LineSegments.Add(new Tuple<Vector2, Vector2>(D, C));
                        LineSegments.Add(new Tuple<Vector2, Vector2>(A, B));
                        break;
                    case 11:
                        LineSegments.Add(new Tuple<Vector2, Vector2>(A, B));
                        break;
                    case 12:
                        LineSegments.Add(new Tuple<Vector2, Vector2>(B, D));
                        break;
                    case 13:
                        LineSegments.Add(new Tuple<Vector2, Vector2>(B, C));
                        break;
                    case 14:
                        LineSegments.Add(new Tuple<Vector2, Vector2>(C, D));
                        break;
                    case 15:
                        break;
                }
            }
        }

        return LineSegments;
    }

    // Get the base 10 state of a cell based on the binary values given
    private static int GetState(int A, int B, int C, int D) {
        var Binary = $"{A}{B}{C}{D}";
        return Convert.ToInt32(Binary, 2);
    }
}