Added Tetris functionality

Assets/Scripts/Grid.cs

@@ -0,0 +1,87 @@
+using System.Collections;
+using System.Collections.Generic;
+using UnityEngine;
+using UnityEngine.UI;
+public class Grid : MonoBehaviour
+{
+    // The grid
+    public static int w = 10;
+    public static int h = 20;
+    public static Transform[,] grid = new Transform[w, h];
+    private static int count = 0;
+
+    // Start is called before the first frame update
+    void Start()
+    {
+
+    }
+
+    // Update is called once per frame
+    void Update()
+    {
+
+    }
+
+    // Round Vector to full numbers
+    public static Vector2 roundVec2(Vector2 v)
+    {
+        return new Vector2(Mathf.Round(v.x), Mathf.Round(v.y));
+    }
+
+    public static bool insideBorder(Vector2 pos)
+    {
+        return ((int)pos.x >= 0 && (int)pos.x < w && (int)pos.y >= 0);
+    }
+    
+    public static void deleteRow(int y)
+    {
+        count++;
+        for (int x = 0; x < w; ++x)
+        {
+            Destroy(grid[x, y].gameObject);
+            grid[x, y] = null;
+        }
+    }
+    
+    public static void decreaseRowsAbove(int y)
+    {
+        for (int i = y; i < h; ++i)
+            decreaseRow(i);
+    }
+   
+    public static void decreaseRow(int y)
+    {
+        for(int x = 0; x < w; ++x)
+        {
+            if(grid[x,y] != null)
+            {
+                grid[x, y - 1] = grid[x, y];
+                grid[x, y] = null;
+
+                grid[x, y - 1].position += new Vector3(0, -1, 0);
+            }
+        }
+    }
+
+    public static bool isRowFull(int y)
+    {
+        for (int x = 0; x < w; ++x)
+            if (grid[x, y] == null)
+                return false;
+        return true;
+    }
+
+    public static void deleteFullRows()
+    {
+        for (int y = 0; y < h; ++y)
+        {
+            if(isRowFull(y))
+            {
+                deleteRow(y);
+                decreaseRowsAbove(y + 1);
+                Group.fallSpeed -= (float)0.025;
+                --y;
+            }
+        }
+    }
+}