1 files changed, 33 insertions, 0 deletions
diff --git a/turtetris_master/screen_checker.py b/turtetris_master/screen_checker.py
new file mode 100644
index 0000000..d8ed327
--- /dev/null
+++ b/turtetris_master/screen_checker.py
@@ -0,0 +1,33 @@
+class ScreenChecker:
+    "Simple screen checker showing lines and updates"
+
+    def __init__(self, matrix):
+        "Initialize it for given matrix"
+        if matrix.height >= matrix.width:
+            raise Exception('ScreenChecker doesn\'t support wide matrix.')
+        self.matrix = matrix
+        self.__tick__ = 0
+        self.__pos__ = [[0, 0] for _ in range(matrix.height)]
+        for i in range(0, matrix.height):
+            self.__pos__[i][1] = i
+            for y in range(0, i):
+                matrix.pixel(i, y, 'green')
+
+    def __pos_inc__(self, p):
+        p += 1
+        if p >= self.matrix.width:
+            p = 0
+        return p
+
+    def tick(self):
+        self.__tick__ += 1
+        if self.__tick__ > 60:
+            self.__tick__ = 0
+            for i in range(0, self.matrix.height):
+                self.matrix.pixel(self.__pos__[i][0], i, '000000')
+                self.__pos__[i][0] = self.__pos_inc__(self.__pos__[i][0])
+                self.__pos__[i][1] = self.__pos_inc__(self.__pos__[i][1])
+                self.matrix.pixel(self.__pos__[i][1], i, color='green')
+            return True
+        else:
+            return False