Добавьте файлы проекта.

FractalTree/CairoWindow.cs

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+using Gtk;
+using CairoObjective;
+using System.Linq;
+using System.Diagnostics;
+
+namespace FractalTree
+{
+    class CairoWindow : Window
+    {
+        DrawingArea drawing = new DrawingArea();
+        DrawObjects.Grid grid;
+        int Scaler = 50;
+        int offsetX = 0;
+        int offsetY = 0;
+        public CairoWindow(string title) : base(title)
+        {
+            Fullscreen();
+            DeleteEvent += delegate { Application.Quit(); };
+            drawing.Drawn += OnDrawn;
+            KeyPressEvent += CairoWindow_KeyPressEvent;
+            Add(drawing);
+            ShowAll();
+            Line.DefaultSize = 2;
+        }
+
+        private void CairoWindow_KeyPressEvent(object o, KeyPressEventArgs args)
+        {
+            if(args.Event.Key == Gdk.Key.equal)
+            {
+                Trace.WriteLine("+");
+                Scaler++;
+                QueueDraw();
+            }
+            if (args.Event.Key == Gdk.Key.minus && Scaler > 1)
+            {
+                Trace.WriteLine("-");
+                Scaler--;
+                QueueDraw();
+            }
+            if (args.Event.Key == Gdk.Key.a)
+            {
+                Trace.WriteLine("←");
+                offsetX-=10;
+                QueueDraw();
+            }
+            if (args.Event.Key == Gdk.Key.d)
+            {
+                Trace.WriteLine("→");
+                offsetX+=10;
+                QueueDraw();
+            }
+            if (args.Event.Key == Gdk.Key.w)
+            {
+                Trace.WriteLine("↑");
+                offsetY += 10;
+                QueueDraw();
+            }
+            if (args.Event.Key == Gdk.Key.s)
+            {
+                Trace.WriteLine("↓");
+                offsetY -= 10;
+                QueueDraw();
+            }
+        }
+
+        private void OnDrawn(object sender, DrawnArgs args)
+        {
+            MainDrawer();
+        }
+        private void MainDrawer()
+        {
+            grid = new(AllocatedWidth, AllocatedHeight, Scaler, offsetX, offsetY);
+            Set.Context = Gdk.CairoHelper.Create(drawing.GdkWindow);
+            Set.Background(new Cairo.Color(0, 0, 0));
+            foreach(CairoObjective.DrawObjects.Line gridline in grid.LinesHorizontal)
+            {
+                Line.Make(gridline, new Cairo.Color(1,1,1));
+            }
+            foreach (CairoObjective.DrawObjects.Line gridline in grid.LinesVertical)
+            {
+                Line.Make(gridline, new Cairo.Color(1, 1, 1));
+            }
+        }
+    }
+}

FractalTree/DrawObjects/Grid.cs

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+using CairoObjective.DrawObjects;
+using System;
+using System.Diagnostics;
+
+namespace FractalTree.DrawObjects
+{
+    internal class Grid
+    {
+        public Line[] LinesHorizontal;
+        public Line[] LinesVertical;
+        int Scaler;
+        int Width;
+        int Height;
+        int offsetX;
+        int offsetY;
+        /// <summary>
+        /// Make Grid Array of lines
+        /// </summary>
+        /// <param name="Width">Width of Window</param>
+        /// <param name="Height">Height of Window</param>
+        /// <param name="Scaler">Pixels Per Lines</param>
+        public Grid(int Width, int Height, int Scaler, int offsetX, int offsetY)
+        {
+            this.Width = Width;
+            this.Height = Height;
+            this.Scaler = Scaler;
+            this.offsetX = offsetX;
+            this.offsetY = offsetY;
+            LinesHorizontal = new Line[this.Width / Scaler + 1];
+                LinesVertical = new Line[this.Height / Scaler + 1];
+            MakeHorizontal();
+            MakeVertical();
+        }
+        private void MakeHorizontal()
+        {
+            for(int i = 0; i < Width / Scaler + 1; i++)
+            {
+                LinesHorizontal[i] = new Line(i * Scaler + offsetX, 0, i * Scaler, Height);
+            }
+        }
+        private void MakeVertical()
+        {
+            for (int i = 0; i < Height / Scaler + 1; i++)
+            {
+                LinesVertical[i] = new Line(0, i * Scaler, Width, i * Scaler);
+            }
+        }
+    }
+}

FractalTree/FractalTree.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <OutputType>WinExe</OutputType>
+    <TargetFramework>net6.0</TargetFramework>
+    <ImplicitUsings>disable</ImplicitUsings>
+    <Nullable>enable</Nullable>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <PackageReference Include="CairoSharp" Version="3.24.24.38" />
+    <PackageReference Include="GtkSharp" Version="3.24.24.38" />
+  </ItemGroup>
+
+  <ItemGroup>
+    <ProjectReference Include="..\CairoObjective\CairoObjective.csproj" />
+  </ItemGroup>
+
+</Project>

FractalTree/Program.cs

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+using Gtk;
+
+namespace FractalTree
+{
+    internal class Program
+    {
+        static void Main()
+        {
+            Application.Init();
+            //Create the Window
+            new CairoWindow("Window");
+            Application.Run();
+        }
+    }
+}