5 Batmobile Ignition Instructions

User Manual: Pdf

Open the PDF directly: View PDF .
Page Count: 3

IFB104'GUI'Workshop'Exercise:'Batmobile'Ignition'

In# this# exercise#you# will# use# the# Tkinter# module# to# develop# a# Graphical# User#

Interface# that# uses# radio# buttons# in# two# different# groups# to# control# the# text#

displayed#in#a#label.#

Motivation:# One# of# the# many# memorable# features# of# the# 1966# Batman# television#

series# was# the# elaborate# ignition# sequence# needed#to# start# the#nuclearFpowered#

Batmobile,#which#always#proceeded#as#follows:#

#

Having#strapped#themselves#in,#Robin#reads#out#the#status#of#the#Batmobile’s#atomic#

batteries# and# turbines,# after# which# Batman# starts# the# ignition# and# with# a# roar# of#

flame# the# Batmobile# begins#its# highFspeed# journey# from# the# secret# Batcave# under#

stately#Wayne#Manor#to#Gotham#City.#

In#this#exercise#you#will#duplicate#part#of#the#Batmobile’s#dashboard#display#using#

label#and#radio#button#widgets.##When#complete,#your#program#should#create#a#GUI#

which#initially#looks#as#follows.#

#

This#window#has#a#large#label#at#the#top,#and#four#radio#buttons#at#the#bottom.##In#

addition,# we# have# put# the# radio# buttons# inside# two# “label# frame”# widgets,# but# you#

may#choose#to#omit#this#nicety#at#first.#

#The#radio#buttons#reflect#the#state#of#the#Batmobile’s#atomic#batteries#and#turbines.##

In#the#initial#state#the#ignition#system#is#in#a#“waiting”#mode.##Changing#just#one#of#

the#pairs#of#radio#buttons#has#no#effect#on#the#Batmobile’s#status:#

#### #

Only#when#the#atomic#batteries#are#set#to#‘Power’#and#the#turbines#are#set#to#‘Speed’#

is#the#Batmobile#‘ready#to#move#out’:#

#

To#complete#this#exercise#you’ll#need#to:#

• Use#the#Tk#and#Label#constructors#to#create#the#root#window#and#the#label#

up#the#top,#whose#text#is#initially#‘Waiting...’.#

• Define#two#BooleanVar#variables#to#represent#the#state#of#the#two#pairs#of#

radio#buttons.#

• Use#the#Radiobuttons#constructor#to#create#the#four#radio#buttons.##Each#

pair# of# buttons# should# have# its# variable# parameter# linked# to# one# of# the#

Boolean# variables.##The# value# parameters# associated# with# the# buttons#

should#tell#us#whether#or#not#the#Batmobile’s#atomic#batteries#and#turbines#

are#set#appropriately#for#ignition.#

• Optionally# put# the# radio# buttons# into# separate# LabelFrame#widgets# to#

create#the#neat#layout#shown#above.#

• Define# a# function# which# is# called# whenever#one# of# the# radio#buttons# is#

pressed.# ##This# function# should# ‘get’# the# values# of# the# Boolean# variables#

(which# are# set# by# the# radio# buttons)# and# use# them# to# update# the# label#

widget’s# text# parameter# to# either# ‘Waiting...’# or# ‘Ready!’# as#

appropriate.##(In# our# example# we# have# also# changed# the# foreground# colour#

attribute,#fg.)#

#

#