5 Batmobile Ignition Instructions

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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	
   nuclear-­‐powered	
  
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	
   high-­‐speed	
   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.)	
  
Source Exif Data: 
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File Type Extension             : pdf
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Page Count                      : 3
PDF Version                     : 1.4
Title                           : 5-batmobile_ignition_instructions
Author                          : x
Subject                         : 
Producer                        : Mac OS X 10.7.5 Quartz PDFContext
Creator                         : Word
Create Date                     : 2014:09:08 04:12:14Z
Modify Date                     : 2014:09:08 04:12:14Z
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