Changes made

BlankProjectTemplate/src/Snake_2.o_Demo.py

-#standard set up
+## Author: Usman Irfan, Andy Hameed
+# This module will be used to control snake body movements and gameplay
+
 import pygame
 from random import randint
 
 pygame.init()
 
-#setting width and height of window
-
-screen_x = 500
-screen_y = 500
-win = pygame.display.set_mode((screen_x,screen_y))
+#setting width and size of window to screenSize
+screenSize = 500
+win = pygame.display.set_mode((screenSize,screenSize))
 
 pygame.display.set_caption("My Game")
 
+#Define color constants
 white = (255,255,255)
+red = (255,0,0)
+blue = (0,0,255)
 black = (0,0,0)
 
+#width1, size1 correspond to constant width and size for the food block
+#width and size change over time as the snake consumes food
+
+width, width1 = 20,20 # can replace with size - one number
+size, size1 = 20,20
+size = 20 # One size for all block created for snake
+
 
-width = 20
-height = 20
 vel = 10
 score = 0
-x = randint(0,screen_x - width)
-y = randint(0, screen_y - height)
+x = randint(0,screenSize - size)
+y = randint(0, screenSize - size)
 
 speed = 40
-# 0 - (- direction) , 1 - (+ direction)
+# 0 gives (- direction)
+# 1 gives (+ direction)
 direction = 0
 # 0 - x-axis , 1 - y-axis
 axis = 0
@@ -32,14 +41,14 @@ axis = 0
 
 location = []
 
-food_x = randint(0,screen_x - width)
-food_y = randint(0,screen_y - height)
+food_x = randint(0,screenSize - size)
+food_y = randint(0,screenSize - size)
 location = [food_x, food_y]
 
     
 
-run = True
- 
+#Loop through the events as long as the game is running
+run = True 
 while run:
     pygame.time.delay(speed) #create a delay to prevent any unwanted behaviour
 
@@ -47,6 +56,7 @@ while run:
     #we loop through the list of events that happen by the user's actions
     for event in pygame.event.get():
 
+        #Check if the event is a quit command and quit the game if it is
         if event.type == pygame.QUIT:
             run = False
 
@@ -67,37 +77,49 @@ while run:
     else:
         x += vel*direction
 
-
+    #Boundary conditions for snake hitting window edge
     if x < 0:
         #x = 0
-        x = screen_x - height
-
+        x = screenSize - size
     if y < 0:
         #y = 0
-        y = screen_y - width
-
-    if y > screen_y - width:
-        #y = 500 - width
+        y = screenSize - size
+    if y > screenSize - size:
+        #y = 500 - size
         y = 0
-    if x > screen_x - height:
-        #x = 500 - height
+    if x > screenSize - size:
+        #x = 500 - size
         x = 0
 
-    
-    #all colors are defined in RGB with Pygame
 
+    #all colors are defined in RGB with Pygame
+    #consumption of food block
     if( abs(x - food_x) < 15 and abs(y - food_y) < 15):
         score += 1
-        food_x = randint(0,screen_x - width)
-        food_y = randint(0,screen_y - height)
+        food_x = randint(0,screenSize - size1)
+        food_y = randint(0,screenSize - size1)
         location = [food_x, food_y]
+        
+        ## --------------------------DELETE --------------------------
+        #extend length or size depending on the direction of the snake
+        if (axis):
+            size += 20
+        else:
+            size += 20
+            
         print('score = ', score)
+        ##---------------------------DELETE----------------------------
         
         
     win.fill(white)
-    pygame.draw.rect(win,(0,0,255), (location[0], location[1], width, height))
-    pygame.draw.rect(win,(255,0,0), (x,y,width, height))
-        
+
+    #Draw food item
+    pygame.draw.rect(win,blue, (location[0], location[1], size1, size1))
+
+    #Draw snake
+    pygame.draw.rect(win, red , (x,y,size, size))
+    
+            
     #we have to update the display to see the drawing of our object. Since it does
     #not automatically update
     pygame.display.update()