From c4c02c167dcdca92319cbfbda47ce6f7f59ff092 Mon Sep 17 00:00:00 2001
From: Mahdi Dibaiee <mdibaiee@aol.com>
Date: Mon, 14 Dec 2015 21:25:07 +0330
Subject: [PATCH] fix(snake): should not be able to go in reverse direction -
 resolve #2 feat(snake): increase speed over time

---
 build/snake.js | 5 ++++-
 src/snake.js   | 8 +++++++-
 2 files changed, 11 insertions(+), 2 deletions(-)

diff --git a/build/snake.js b/build/snake.js
index 66b3794..60a7d74 100644
--- a/build/snake.js
+++ b/build/snake.js
@@ -57,7 +57,7 @@ function loop() {
     createPart();
     score++;
 
-    FRAME--;
+    FRAME -= 5;
   }
 
   if (head.collides(snake.slice(2))) {
@@ -103,6 +103,7 @@ ui.onKey(function () {
 });
 
 function changeDirection(dir) {
+  if (head.direction === UP && dir === DOWN || head.direction === DOWN && dir === UP || head.direction === LEFT && dir === RIGHT || head.direction === RIGHT && dir === LEFT) return;
   head.direction = dir;
 }
 
@@ -176,6 +177,8 @@ function gameover() {
   ui.cursor.goto(ui.center.x - RETRY.length / 2, ui.center.y + 2);
   ui.write(RETRY);
 
+  FRAME = 100;
+
   stop = true;
 }
 
diff --git a/src/snake.js b/src/snake.js
index cd24aec..1226e8d 100644
--- a/src/snake.js
+++ b/src/snake.js
@@ -43,7 +43,7 @@ function loop() {
     createPart();
     score++;
 
-    FRAME--;
+    FRAME -= 5;
   }
 
   if (head.collides(snake.slice(2))) {
@@ -89,6 +89,10 @@ ui.onKey(() => {
 })
 
 function changeDirection(dir) {
+  if (head.direction === UP && dir === DOWN ||
+      head.direction === DOWN && dir === UP ||
+      head.direction === LEFT && dir === RIGHT ||
+      head.direction === RIGHT && dir === LEFT) return;
   head.direction = dir;
 }
 
@@ -156,6 +160,8 @@ function gameover() {
   ui.cursor.goto(ui.center.x - RETRY.length / 2, ui.center.y + 2);
   ui.write(RETRY);
 
+  FRAME = 100;
+
   stop = true;
 }