Diff: Snek/Snek.cpp

Revision:

15:130900e5c268

Parent:

12:d3eef5ea3f43

Child:

17:2a909f7da973

--- a/Snek/Snek.cpp	Tue May 08 13:15:41 2018 +0000
+++ b/Snek/Snek.cpp	Tue May 08 14:06:47 2018 +0000
@@ -13,17 +13,17 @@
 
 void Snek::init(int x, int y)
 {
-    memset(_x, 0, sizeof(_x));
-    memset(_y, 0, sizeof(_y));
+    memset(_x, 0, sizeof(_x));  //clears the x coordinate array
+    memset(_y, 0, sizeof(_y));  //clears the y coordinate array
     
     //Inital values for variables
     _length = 3;
 
     _oldDirection = 'N';
 
-    for (int i = 0; i < _length; i++) {
-        _x[i] = x;
-        _y[i] = y + i;
+    for (int i = 0; i < _length; i++) { //sets the starting values for the snake coordinates
+        _x[i] = x;                      //all have the same X coordinate
+        _y[i] = y + i;                  //the Y coordinate is incremmented for each tail segment 
     }
 }
 
@@ -34,9 +34,9 @@
         _y[i] =  _y[i-1];
     }
 
-    if (d == N && _oldDirection != 'S') { //checks the current direction so the snake cannot go back on itself
-        _y[0] -= 1;
-        _oldDirection = 'N';
+    if (d == N && _oldDirection != 'S') {   //checks the new direction so the snake cannot go back on itself
+        _y[0] -= 1;                         //changes a coordinate of the snake's head
+        _oldDirection = 'N';                //updates the _oldDirection so the snake will travel in the new direction with no play input
     } else if (d == S && _oldDirection != 'N') {
         _y[0] += 1;
         _oldDirection = 'S';
@@ -46,9 +46,9 @@
     }   else if (d == W && _oldDirection != 'E') {
         _x[0] -= 1;
         _oldDirection = 'W';
-    } else {
-        if (_oldDirection == 'N') {
-            _y[0] -= 1;
+    } else {                                //if there is no player input (new direction)...
+        if (_oldDirection == 'N') {         //checks the old direction...
+            _y[0] -= 1;                     //and changes a coordinate of the snake's head depending on the _oldDirection
         } else if (_oldDirection == 'S') {
             _y[0] += 1;
         } else if (_oldDirection == 'E') {
@@ -76,6 +76,6 @@
 
 void Snek::grow()
 {
-    _length+=1;
+    _length+=1;  //increments the length of the snake
 }