SurfaceMap.cs

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using System;
 
namespace Terraria.GameContent.Biomes.Desert;
 
public class SurfaceMap
{
    public readonly double Average;
 
    public readonly int Bottom;
 
    public readonly int Top;
 
    public readonly int X;
 
    private readonly short[] _heights;
 
    public int Width => _heights.Length;
 
    public short this[int absoluteX] => _heights[absoluteX - X];
 
    private SurfaceMap(short[] heights, int x)
    {
        _heights = heights;
        X = x;
        int num = 0;
        int num2 = int.MaxValue;
        int num3 = 0;
        for (int i = 0; i < heights.Length; i++)
        {
            num3 += heights[i];
            num = Math.Max(num, heights[i]);
            num2 = Math.Min(num2, heights[i]);
        }
        if ((double)num > Main.worldSurface - 10.0)
        {
            num = (int)Main.worldSurface - 10;
        }
        Bottom = num;
        Top = num2;
        Average = (double)num3 / (double)_heights.Length;
    }
 
    public static SurfaceMap FromArea(int startX, int width)
    {
        int num = Main.maxTilesY / 2;
        short[] array = new short[width];
        for (int i = startX; i < startX + width; i++)
        {
            bool flag = false;
            int num2 = 0;
            for (int j = 50; j < 50 + num; j++)
            {
                if (Main.tile[i, j].active())
                {
                    if (Main.tile[i, j].type == 189 || Main.tile[i, j].type == 196 || Main.tile[i, j].type == 460)
                    {
                        flag = false;
                    }
                    else if (!flag)
                    {
                        num2 = j;
                        flag = true;
                    }
                }
                if (!flag)
                {
                    num2 = num + 50;
                }
            }
            array[i - startX] = (short)num2;
        }
        return new SurfaceMap(array, startX);
    }
}