[Tutor] Alphabet lookup table

[Alan Gauld]

On 28/01/2022 05:35, Phil wrote:
> I have a 5 x 7 font lookup table class method that returns five hex 
> values for a character. So far I've only created six entries and being 
> basically lazy I'm wondering if something like this has already been 
> created, failing that, is this the correct way to go about it anyway?
>

Assuming this is still part of your LED simulation then yes,
this is a fairly common approach. You might find it easier
to use binary rather than hex though. And I'd put the letter
definitions into a separate module - that way it's easy to
change "fonts" by renaming the files.


alpha_table = {
  'P' : ['0b01111111',
         '0b00001001',
         '0b00001001',
         '0b00001001',
         '0b00000110'],

  'H' : ['0b01111111',
         '0b00000100',
         '0b00000100',
         '0b00000100',
         '0b01111111'],
   I  : [ etc...


> An Internet search didn't reveal such a module.
> 
> class Alphabet:
>      def __init__(self):
>          self.alpha_table = {'P': ['0x7f', '0x09', '0x09', '0x09', '0x06'],
>                                         'H': ['0x7f', '0x08', '0x08', 
> '0x08', '0x7f'],
>                                         'I': ['0x00', '0x41', '0x7f', 
> '0x41', '0x00'],
                                  }
> 
>      def get_char(self, char):
>          return self.alpha_table[char]
> 


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Alan G
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