Adv2018/D6.Bonus/Program.cs

using System;
using System.Collections.Generic;
using System.Drawing;
using System.IO;
using System.Linq;

namespace D6.Bonus
{
    class Program
    {
        static void Main(string[] args)
        {
            if (args.Length < 2) return;
            if (File.Exists(args[0]) == false) return;
            if (int.TryParse(args[1], out int ceil) == false) return;

            var coordinates = new List<((uint x, uint y) coord, bool isInfinite)>();
            var file = File.OpenText(args[0]);

            uint minXY = int.MaxValue;
            uint maxXY = 0;

            do
            {
                var line = file.ReadLine();
                if (line == null) break;

                var cl = line.Split(", ");
                (uint x, uint y) xy = (uint.Parse(cl[0]), uint.Parse(cl[1]));

                if (xy.x < minXY) minXY = xy.x;
                if (xy.y < minXY) minXY = xy.y;
                if (xy.x > maxXY) maxXY = xy.x;
                if (xy.y > maxXY) maxXY = xy.y;

                coordinates.Add((xy, false));
            } while (true);

            uint size = minXY + maxXY;

            var area = new (int closest, int total)[size, size];

            FillMapArea(size, coordinates, area);

            FlagPointOnEdges(size, coordinates);

            GenerateBitMap(ceil, coordinates, size, area);
        }

        private static void GenerateBitMap(int ceil, List<((uint x, uint y) coord, bool isInfinite)> coordinates, uint size, (int closest, int total)[,] area)
        {
            var bmp = new Bitmap((int)size, (int)size);
            Random r = new Random();
            Dictionary<int, Color> Colors = new Dictionary<int, Color>();

            for (var x = 0; x < size; x++)
            {
                for (var y = 0; y < size; y++)
                {
                    var id = area[x, y].closest;
                    var total = area[x, y].total;

                    if (Colors.ContainsKey(id) == false)
                        Colors.Add(id, Color.FromArgb(coordinates.ElementAt(id).isInfinite ? 20 : 255, r.Next(0, 256), r.Next(0, 256), r.Next(0, 256)));

                    if (coordinates.ElementAt(id).isInfinite && (x + y % 3) % 3 > 0) continue;

                    bmp.SetPixel(x, y, Colors[id]);

                    var c = bmp.GetPixel(x, y);
                    if (total < ceil) bmp.SetPixel(x, y, Color.FromArgb((int)((c.R + 127) / 1.5), (int)((c.G + 127) / 1.5), (int)((c.B + 127) / 1.5)));
                }
            }

            foreach (var coord in coordinates)
            {
                int x = (int)coord.coord.x;
                int y = (int)coord.coord.y;
                bmp.SetPixel(x, y, Color.Red);
                bmp.SetPixel(x - 1, y, Color.Red);
                bmp.SetPixel(x + 1, y, Color.Red);
                bmp.SetPixel(x, y - 1, Color.Red);
                bmp.SetPixel(x, y + 1, Color.Red);

                bmp.SetPixel(x - 1, y - 1, Color.DarkRed);
                bmp.SetPixel(x + 1, y - 1, Color.DarkRed);
                bmp.SetPixel(x - 1, y + 1, Color.DarkRed);
                bmp.SetPixel(x + 1, y + 1, Color.DarkRed);
            }

            bmp = new Bitmap(bmp, new Size((int)(size * 2), (int)(size * 2)));

            bmp.Save("result.bmp");
        }

        private static void FlagPointOnEdges(uint size, List<((uint x, uint y) coord, bool isInfinite)> coordinates)
        {
            for (uint i = 0; i < size; ++i)
            {
#pragma warning disable IDE0042 // Deconstruct variable declaration

                var x0yi = GetClosest(coordinates, (0, i));
                MarkInfinite(coordinates, x0yi.closest);

                var xiy0 = GetClosest(coordinates, (i, 0));
                MarkInfinite(coordinates, xiy0.closest);

                var xsizeyi = GetClosest(coordinates, (size, i));
                MarkInfinite(coordinates, xsizeyi.closest);

                var xiysize = GetClosest(coordinates, (i, size));
                MarkInfinite(coordinates, xiysize.closest);

#pragma warning restore IDE0042 // Deconstruct variable declaration
            }
        }

        private static void FillMapArea(uint size, List<((uint x, uint y) coord, bool isInfinite)> coordinates, (int closest, int total)[,] area)
        {
            for (uint x = 0; x < size; x++)
            {
                for (uint y = 0; y < size; y++)
                {
                    var closest = GetClosest(coordinates, (x, y));
                    area[x,y] = closest;
                }
            }
        }

        private static (int closest, int total) GetClosest(List<((uint x, uint y) coord, bool isInfinite)> coordinates, (uint x, uint y) point)
        {
            int total = 0;
            int lowest = int.MaxValue;
            int lowestId = 0;
            for (int i = 0; i < coordinates.Count; i++)
            {
                var (x, y) = coordinates[i].coord;
                var manhattan = Math.Abs((int)point.x - (int)x) + Math.Abs((int)point.y - (int)y);
                if (manhattan < lowest)
                {
                    lowest = manhattan;
                    lowestId = i;
                }
                total += manhattan;
            }
            return (lowestId, total);
        }

        private static void MarkInfinite(List<((uint x, uint y) coord, bool isInfinite)> coordinates, int id)
        {
            var coord = coordinates[id];
            coord.isInfinite = true;
            coordinates[id] = coord;
        }
    }
}