Pygame snake for android

#pylint:disable=W0603
import pygame
import random


COLOR_WHITE = (255,255,255)
COLOR_RED = (255,0,0)
COLOR_GREEN = (0,255,0)
COLOR_BLUE = (0,0,255)
COLOR_BLACK = (0,0,0)
COLOR_MAGENTA = (255,0,255)
SCREEN_W = 640
SCREEN_H = 500
ROOM_W = 900
ROOM_H = 400
VIEW_X = 0
VIEW_Y = 0
BORDER = 35
ABUTTON_XPERC = 75
ABUTTON_YPERC = 75
ABUTTON_W = 20
RIGHT = (1,0)
LEFT = (-1,0)
UP = (0,-1)
DOWN = (0,1)
SPEED = 16



EVENT_KEY_W = pygame.event.Event(pygame.KEYDOWN, unicode="w", key=pygame.K_w, mod=pygame.KMOD_NONE)
#EVENT_KEY_A = pygame.event.Event(pygame.locals.KEYDOWN, unicode="a", key=pygame.locals.K_a, mod=pygame.locals.KMOD_NONE)
#EVENT_KEY_S = pygame.event.Event(pygame.locals.KEYDOWN, unicode="s", key=pygame.locals.K_s, mod=pygame.locals.KMOD_NONE)
#EVENT_KEY_D = pygame.event.Event(pygame.locals.KEYDOWN, unicode="d", key=pygame.locals.K_d, mod=pygame.locals.KMOD_NONE)

#pygame.event.post(EVENT_KEY_A)


def draw_rect(surf,x,y,w,h,color):
    rect = pygame.Rect(x,y,w,h)
    pygame.draw.rect(surf,color,rect)

def percent(n):
    return n * 0.01

def point_in_rect(x,y,rx,ry,rw,rh):
    if x >= rx and y >= ry and x <= (rx+rw) and y <= (ry + rh):
        return True
    return False


class Game:
    def __init__(self):
        self.running = False
        self.mousedown = False
        self.mouse_x = None
        self.mouse_y = None
        self.segments = []
        self.buttons = []
        self.device_w = 100
        self.device_h = 400
        self.next_dir = random.choice([UP,DOWN,LEFT,RIGHT])
        pygame.init()
        width = pygame.display.Info().current_w
        height = pygame.display.Info().current_h
        self.screen = pygame.display.set_mode([SCREEN_W-BORDER,SCREEN_H])
        self.device_w, self.device_h = pygame.display.get_surface().get_size()
        self.device_w = width
        self.device_h = height
        sx = random.randrange(BORDER,SCREEN_W)
        sy = random.randrange(BORDER,SCREEN_H)
        self.snakehead = Segment(sx,sy,self,0,COLOR_BLUE)
        self.button_up = Button(self,100,600,60,60,COLOR_BLUE,COLOR_GREEN,EVENT_KEY_W)


    def start(self):
        self.running = True

    def main(self):
        self.mouse_x = pygame.mouse.get_pos()[0]
        self.mouse_y = pygame.mouse.get_pos()[1]
        self.events()
        self.draw()
        clock.tick(fps)

    def events(self):
        for event in pygame.event.get():
            if event.type == pygame.QUIT:
                self.running = False
            if event.type == pygame.MOUSEBUTTONDOWN:
                mpos = pygame.mouse.get_pos()
                self.mouse_x = mpos[0]
                self.mouse_y = mpos[1]
            if event.type == pygame.KEYDOWN:
                if event.type == pygame.K_w:
                    self.next_dir = UP
                    self.button_up.current_color = COLOR_BLACK

        for segment in self.segments:
            segment.step()
        for button in self.buttons:
            button.check_click(self.mouse_x,self.mouse_y)

    def draw(self):
        self.screen.fill(COLOR_BLACK)
        draw_rect(game.screen,BORDER,BORDER,SCREEN_W,SCREEN_H,COLOR_WHITE)
        for segment in self.segments:
            segment.draw()
        for button in self.buttons:
            button.draw()
        pygame.display.flip()


class Segment:
    def __init__(self,x,y,context,index,color = COLOR_MAGENTA):
        self.x = x
        self.y = y
        self.current_color = color
        self.w = 16
        self.h = 16
        self.left = x
        self.right = x+self.w
        self.top = y
        self.bottom = y+self.h
        context.segments.append(self)
        self.game = context
        self.index = index

    def move(self,direction):
        xoff = direction[0]
        yoff = direction[1]
        self.x = self.x + (xoff*SPEED)
        self.y = self.y + (yoff*SPEED)

    def draw(self):
        draw_rect(game.screen,self.x,self.y,16,16,self.current_color)

    def step(self):
        self.move(game.next_dir)

class Button:
    def __init__(self,context,x,y,w,h,color,color_click,event):
        self.game = context
        self.x = x
        self.y = y
        self.w = w
        self.h = h
        self.event = event
        self.color = color
        self.color_click = color_click
        self.current_color = color
        context.buttons.append(self)

    def check_click(self,x,y):
        if point_in_rect(x,y,self.x,self.y,self.w,self.h):
            self.onclick()

    def draw(self):
        draw_rect(game.screen,self.x,self.y,self.w,self.h,self.current_color)

    def onclick(self):
        self.current_color = self.color_click
        pygame.event.post(self.event)

game = Game()
clock = pygame.time.Clock()
fps = 2
game.start()
while game.running:
    game.main()