The snake game using processing :P

snake_game.pyde

SCREEN_SIZE = 600
pla = None
FPS = 12

def round20(x, base=20):
    return int(base * round(float(x)/base))

APPLE_POS = [round20(random(SCREEN_SIZE)), round20(random(SCREEN_SIZE))]

class Snake:
    def __init__(self, headx, heady, sLength, cMotion):
        self.headx = headx
        self.heady = heady
        self.sLength = sLength
        self.bodies = []
        self.cMotion = cMotion
        
    def update(self):
        global APPLE_POS, FPS
        pHead = (self.headx, self.heady)
        if self.cMotion == 'LEFT':
            self.headx += 20
        elif self.cMotion == 'UP':
            self.heady -= 20
        elif self.cMotion == 'DOWN':
            self.heady += 20
        elif self.cMotion == 'RIGHT':
            self.headx -= 20
            
        if self.headx == APPLE_POS[0] and self.heady == APPLE_POS[1]:
            self.sLength += 1
            FPS += 1
            APPLE_POS = [round20(random(SCREEN_SIZE)), round20(random(SCREEN_SIZE))]
            
        self.bodies.append(pHead)
        while len(self.bodies) > self.sLength:
            self.bodies.pop(0)
            
        for b in self.bodies:
            if b[0] == self.headx and b[1] == self.heady:
                print('OW!')
                exit()
            
    def show(self):
        fill(0,255,0)
        noStroke()
        rect(self.headx, self.heady, 20, 20)
        for b in self.bodies:
            rect(b[0], b[1], 20, 20)

def setup():
    global pla
    size(SCREEN_SIZE, SCREEN_SIZE)
    pla = Snake(width/2, height/2, 0, 'LEFT')
    
def draw():
    global pla, FPS
    frameRate(FPS)
    background(255)
    if keyPressed:
        if pla.cMotion == 'DOWN':
            if key == 'd':
                pla.cMotion = 'LEFT'
            if key == 'a':
                pla.cMotion = 'RIGHT'
        if pla.cMotion == 'UP':
            if key == 'd':
                pla.cMotion = 'LEFT'
            if key == 'a':
                pla.cMotion = 'RIGHT'
        if pla.cMotion == 'LEFT':
            if key == 'w':
                pla.cMotion = 'UP'
            if key == 's':
                pla.cMotion = 'DOWN'
        if pla.cMotion == 'RIGHT':
            if key == 'w':
                pla.cMotion = 'UP'
            if key == 's':
                pla.cMotion = 'DOWN'
                
    if pla.headx >= width or pla.headx <= 0 or pla.heady >= height or pla.heady <= 0:
        print('OW!')
        exit()
        
    fill(255,0,0)
    noStroke()
    rect(APPLE_POS[0], APPLE_POS[1], 20, 20)
    pla.update()
    pla.show()