AdventOfCode23/Day22/Brick.cs

namespace Day22;

public class Brick
{
    private static int _count = 0;
    
    public Vec Start { get; private set; }
    public Vec End { get; private set; }
    public Vec Axis { get; }
    public long Size { get; }
    public char Label { get; }
    public long MinZ { get; private set; }
    
    public Brick(Vec start, Vec end)
    {
        Start = start;
        End = end;
        Label = (char)('A' + _count % 26);
        _count++;

        Axis = End.Subtract(Start);
        Size = Axis.Magnitude();
        MinZ = Math.Min(Start.Z, End.Z);
    }

    public IEnumerable<Vec> Points()
    {
        var p = Start;
        var v = Axis.Normalize();
        for (var i = 0; i <= Size; i++)
        {
            yield return p;
            p = p.Add(v);
        }
    }

    public void MoveDown(long count)
    {
        Start = Start.Add(Vec.Down.Multiply(count));
        End = End.Add(Vec.Down.Multiply(count));
        MinZ = Math.Min(Start.Z, End.Z);
    }
}