fix change direction into itself #7

src/snake.c

@@ -1,6 +1,7 @@
 #include "snake.h"
 #include "game.h"   //for access to global 'game' struct
 
+bool snakeSetDirectionIsAllowed = true;
 
 void snakeInit()
 {
@@ -45,6 +46,8 @@ void snakeMove()
 {   
     int i = game.snake.length - 1;  // counter for snake moving
     
+    snakeSetDirectionIsAllowed = true;   // direction can be changed now
+
     // update head position automatically
     snakeUpdateHeadPos();
 
@@ -63,6 +66,12 @@ void snakeMove()
 
 void snakeSetDir(snakeDirection_t dir)
 {   
+    // if direction mustn changed
+    if(!snakeSetDirectionIsAllowed)
+    {
+        return;
+    }
+
     // check, if snake should be move in opposite direction -> new direction stays old direction
     switch(dir)
     {
@@ -92,6 +101,7 @@ void snakeSetDir(snakeDirection_t dir)
 
     }
     game.snake.direction = dir;
+    snakeSetDirectionIsAllowed = false;     // direction cannot updated until next snakeMove
     return;
 }