Add grid line full, clear line and game hit top functions

Models/Game.cs

@@ -52,6 +52,23 @@ public class Game : INotifyPropertyChanged {
         return !_grid.CanGo(_currentTetrominoe, _currentTetrominoe.Coordinates + new Size(0, 1));
     }
 
+    public bool HitTop() {
+        if (_currentTetrominoe == null)
+            return false;
+        else if (_grid.CanGo(_currentTetrominoe, _currentTetrominoe.Coordinates + new Size(0, 1)))
+            return false;
+
+        return _grid.MinGrid.Y == _currentTetrominoe.Coordinates.Y;
+    }
+
+    public bool LineFull() {
+        return _grid.LineFull();
+    }
+    
+    public void ClearLine() {
+        _grid.ClearLine();
+    }
+
     public void PrintTetrominoe() {
         if (_currentTetrominoe == null)
             return;

Models/Grid.cs

@@ -1,5 +1,7 @@
 using System;
 using System.Drawing;
+using System.Linq;
+using System.Windows.Documents;
 using System.Windows.Media;
 using Pastel;
 using Color = System.Drawing.Color;
@@ -9,7 +11,7 @@ namespace Tetris.Models;
 public class Grid {
     private Color[,] _grid;
 
-    public Color[,] CGrid => (Color[,])_grid.Clone();
+    public Color[,] CGrid => _grid;
 
     public Point MinGrid => new Point(0,0);
     public Point MaxGrid => new Point(_grid.GetLength(0)-1, _grid.GetLength(1)-1);
@@ -36,6 +38,20 @@ public class Grid {
         return true;
     }
     
+    public bool LineFull() {
+        return Enumerable.Range(0, _grid.GetLength(0)).Select(x => _grid[x, MaxGrid.Y]).All(x => x != Color.Empty);
+    }
+
+    public void ClearLine() {
+        for (int x = 0; x <= MaxGrid.X; x++)
+            for (int y = MaxGrid.Y; y > 0; y--) {
+                _grid[x, y] = _grid[x, y - 1];
+            }
+        
+        for (int x = 0; x <= MaxGrid.X; x++)
+            _grid[x,0] = Color.Empty;
+    }
+
     public void PrintTetrominoe(Tetrominoe t) {
         bool[,] shape = t.Shape;