added async stone detection thread

field.py

@@ -1,4 +1,5 @@
 #!/usr/bin/python
+from copy import copy
 
 from tetromino import Tetromino
 
@@ -59,7 +60,7 @@ class Field():
     def rotate_state(self):
         self.state = self.rotate_90_degree_anticlckwise(self.state)
         #self.state = self.matrixflip(self.state, 'v')
-        print(self.state)
+        #print(self.state)
 
     def get_line_count(self):
         return self.cleared_rows
@@ -148,6 +149,18 @@ class Field():
         self._line_clear()
         return row
 
+
+
+    def predict_gaps_in_next_rotation(self):
+        tmp_state = copy(self.state)
+        tmp_state = self.rotate_90_degree_anticlckwise(tmp_state)
+        for row in range(int(self.HEIGHT/2)):
+            tmp_state[row] = [' ' for cols in range(Field.WIDTH)]
+        return sum(
+            ["".join([row[col] for row in tmp_state]).lstrip().count(' ')
+             for col in range(Field.WIDTH)])
+
+
     def count_gaps(self):
         """
         Check each column one by one to make sure there are no gaps in the