Restructuring, refactoring.

include/animation_functions.h

@@ -0,0 +1,20 @@
+#ifndef ANIMATIONFUNCTIONS_H
+#define ANIMATIONFUNCTIONS_H
+
+#include <Arduino.h>
+
+enum Direction
+{
+    RIGHT,
+    LEFT,
+    UP,
+    DOWN
+};
+
+Direction next_direction(Direction dir, int d);
+int random_snake(bool init, const uint8_t len, const uint32_t color, int numSteps);
+int random_tetris(bool init);
+int draw_spiral(bool init, bool empty, uint8_t size);
+void show_digital_clock(uint8_t hours, uint8_t minutes, uint32_t color);
+
+#endif  /* ANIMATIONFUNCTIONS_H */