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src/Program.cs

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+using System;
+using System.Threading;
+using System.Threading.Tasks;
+
+namespace SharpRain
+{
+	class Program
+	{
+		static void Main(string[] args)
+		{
+			Console.CursorVisible = false;
+			Console.Clear();
+
+			while (true)
+			{
+				new RainDrop(Console.BufferWidth, Console.BufferHeight);
+				Thread.Sleep(500);
+			}
+		}
+	}
+
+	class RainDrop
+	{
+		char[] chars = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ1234567890^&$%#@!*?;:".ToCharArray();
+		char GetNewChar() 
+		{
+			return chars[new Random().Next(chars.Length)];
+		}
+
+		int rainSize = 0;
+		int max = 7;
+
+		int col = 0;
+		int row = 0;
+
+		int termW, termH;
+
+		static int lastCol;
+
+		public RainDrop(int _w, int _h)
+		{
+			termW = _w;
+			termH = _h;
+
+			var rand = new Random().Next(termW);
+			while (rand == lastCol)
+            {
+				rand = new Random().Next(termW);
+			}
+			col = rand;
+
+			Start();
+		}
+
+		public async void Start()
+		{
+			await Task.Run(() => { StartDropping(); });
+		}
+
+		async void StartDropping()
+		{
+			while (MoveDown())
+			{
+				Thread.Sleep(150);
+			}
+		}
+
+		bool MoveDown()
+		{
+			if (row + rainSize == termH)
+			{
+				rainSize--;
+				row++;
+
+			}
+			else
+			{
+				if (rainSize < max)
+				{
+					rainSize++;
+				}
+				else
+				{
+					row++;
+				}
+			}
+			if (row > 2)
+			{
+				for (int i = row - 3; i < row; i++)
+				{
+					Utils.WriteAt(col, i, " ", ConsoleColor.Green);
+				}
+
+			}
+			for (int i = 0; i < rainSize; i++)
+			{
+				if (i == rainSize - 1)
+				{
+					Utils.WriteAt(col, row + i, GetNewChar(), ConsoleColor.Cyan);
+				}
+				else
+				{
+					Utils.WriteAt(col, row + i, GetNewChar(), ConsoleColor.Green);
+				}
+			}
+			if (row == termH)
+			{
+				return false;
+			}
+			return true;
+		}
+	}
+
+	class Utils
+	{
+		static char c = (char)27;
+
+		public static void WriteAt(int left, int top, string text, ConsoleColor forecolor)
+		{
+			Console.ForegroundColor = forecolor;
+			Console.Write(c + "[" + top.ToString() + ";" + left.ToString() + "H" + text);
+		}
+
+		public static void WriteAt(int left, int top, char character, ConsoleColor forecolor)
+		{
+			WriteAt(left, top, character.ToString(), forecolor);
+		}
+
+		public static void WriteAt(int left, int top, string text, ConsoleColor forecolor, ConsoleColor backcolor)
+		{
+			Console.BackgroundColor = backcolor;
+			WriteAt(left, top, text, forecolor);
+		}
+
+		public static void WriteAt(int left, int top, char character, ConsoleColor forecolor, ConsoleColor backcolor)
+		{
+			Console.BackgroundColor = backcolor;
+			WriteAt(left, top, character.ToString(), forecolor);
+		}
+	}
+}

src/SharpRain.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <OutputType>Exe</OutputType>
+    <TargetFramework>net5.0</TargetFramework>
+    <Platforms>AnyCPU;x64</Platforms>
+    <StartupObject>SharpRain.Program</StartupObject>
+  </PropertyGroup>
+
+</Project>