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Batch File variables for ASCII character animations
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This video discusses the use of variables in Windows Batch File ASCII character animations. In particular, it highlights the advantages of FOR loops to created and access the large numbers of variables needed for rows (e.g. set Row%I=ABC), and the substrings needed for column values (e.g. echo !Variable:~%i%!). This is illustrated in the code below for Matrix-style dripping characters.
rem --- Initialize.
setlocal EnableDelayedExpansion
color 0A
set /A "MaxX = 100"
set /A "MaxY = 50"
set /A "lines=MaxY+2","cols=MaxX+1"
mode con lines=%lines% cols=%cols%
set "CharSetWithSpaces= 01233456789ABCDEFGHIJKLMNOPQRSTUVWXYZ"
:PERPETUAL_LOOP
rem --- Build the top row.
set /A "TopRow = (TopRow + 1) %% (MaxY + 1)"
set "Row_%TopRow%="
for /L %%X in (1,1,%MaxX%) do (
set /A "i = !RANDOM! %% 70"
call set "Row_%%TopRow%%=!Row_%TopRow%!%%CharSetWithSpaces:~!i!,1%%"
)
rem --- Display Screen.
set /A "Top2 = TopRow + 1"
cls
for /L %%Y in (%TopRow%,-1,0) do echo(!Row_%%Y!
for /L %%Y in (%MaxY%,-1,%Top2%) do echo(!Row_%%Y!
goto :PERPETUAL_LOOP
(C) Copyright 2012 Mr Batch Files.
rem --- Initialize.
setlocal EnableDelayedExpansion
color 0A
set /A "MaxX = 100"
set /A "MaxY = 50"
set /A "lines=MaxY+2","cols=MaxX+1"
mode con lines=%lines% cols=%cols%
set "CharSetWithSpaces= 01233456789ABCDEFGHIJKLMNOPQRSTUVWXYZ"
:PERPETUAL_LOOP
rem --- Build the top row.
set /A "TopRow = (TopRow + 1) %% (MaxY + 1)"
set "Row_%TopRow%="
for /L %%X in (1,1,%MaxX%) do (
set /A "i = !RANDOM! %% 70"
call set "Row_%%TopRow%%=!Row_%TopRow%!%%CharSetWithSpaces:~!i!,1%%"
)
rem --- Display Screen.
set /A "Top2 = TopRow + 1"
cls
for /L %%Y in (%TopRow%,-1,0) do echo(!Row_%%Y!
for /L %%Y in (%MaxY%,-1,%Top2%) do echo(!Row_%%Y!
goto :PERPETUAL_LOOP
(C) Copyright 2012 Mr Batch Files.
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