Update

Models/Grid.cs

@@ -8,6 +8,8 @@ namespace Tetris.Models;
 public class Grid {
     private Color[,] _grid;
 
+    public Color[,] CGrid => (Color[,]) _grid.Clone();
+
     public Point MinGrid => new Point(0,0);
     public Point MaxGrid => new Point(_grid.GetLength(0)-1, _grid.GetLength(1)-1);
 

ViewsModels/GameViewModel.cs

@@ -1,8 +1,13 @@
-using System;
+
+
+using System;
 using System.ComponentModel;
+using System.Drawing;
 using System.Windows.Media;
 using System.Windows.Media.Imaging;
 using System.Windows.Threading;
+using Tetris.Models;
+using Color = System.Drawing.Color;
 
 namespace Tetris.ViewsModels;
 
@@ -15,10 +20,14 @@ public class GameViewModel : INotifyPropertyChanged
     private readonly int _width = 480, _height = 640;
     private readonly WriteableBitmap _writeableBitmap;
 
+    private const int GridWidth = 10;
+    private const int GridHeight = 20;
+    private static readonly Grid Grid = new(new Color[GridWidth, GridHeight]);
+    private readonly Tetrominoe _currentTetrominoe = new(Grid, "J", new Point(10, 10), 0, Color.Aqua);
+
     public GameViewModel()
     {
         _writeableBitmap = BitmapFactory.New(_width, _height);
-        // image.Source = _writeableBitmap;
         
         var dispatcherRenderTimer = new DispatcherTimer
         {
@@ -46,11 +55,33 @@ public class GameViewModel : INotifyPropertyChanged
         _writeableBitmap.Lock();
         _writeableBitmap.Clear(Colors.Black);
 
+        for (var x = 0; x < GridWidth; x++)
+        {
+            for (var y = 0; y < GridHeight; y++)
+            {
+                var color = Grid.CGrid[x, y];
+                _writeableBitmap.SetPixel(x, y, color.R, color.G, color.B);
+            }
+        }
+
+        var tetrominoeWidth = _currentTetrominoe.Shape.GetLength(0);
+        var tetrominoeHeight = _currentTetrominoe.Shape.GetLength(1);
+
+        for (int x = 0; x < tetrominoeWidth; x++)
+        {
+            for (int y = 0; y < tetrominoeHeight; y++)
+            {
+                if (!_currentTetrominoe.Shape[x, y]) continue;
+                var color = _currentTetrominoe.Color;
+                _writeableBitmap.FillRectangle(_currentTetrominoe.Coordinates.X * 10, _currentTetrominoe.Coordinates.Y * 10, _currentTetrominoe.Coordinates.X * 10 + 10, _currentTetrominoe.Coordinates.Y * 10 + 10, color.ToArgb());
+            }
+        }
+
         _writeableBitmap.Unlock();
     }
     
     private void Update(object? sender, EventArgs eventArgs)
     {
-        
+        _currentTetrominoe.GoDown();
     }
 }