Richard Suchenwirth 2004-04-23 - Yet another tiny fun project, here's how to convert a string of digits and some other characters to a multiline string that in a fixed-pitch font looks like a 7-segment LCD/LED display:
proc num->7seg string {
foreach i {a b c} {set $i " "}
array set 7segment {
0 {{ _ } {| |} {|_|}}
1 {{ } { |} { |}}
2 {{ _ } { _|} {|_ }}
3 {{ _ } { _|} { _|}}
4 {{ } {|_|} { |}}
5 {{ _ } {|_ } { _|}}
6 {{ _ } {|_ } {|_|}}
7 {{ _ } { |} { |}}
8 {{ _ } {|_|} {|_|}}
9 {{ _ } {|_|} { _|}}
- {{ } { _ } { }}
E {{ _ } {|_ } {|_ }}
r {{ } { _ } {| }}
o {{ } { _ } {|_|}}
A {{ _ } {|_|} {| |}}
B {{ } {|_ } {|_|}}
C {{ _ } {| } {|_ }}
D {{ } { _|} {|_|}}
F {{ _ } {|_ } {| }}
}
foreach char [split $string ""] {
if {$char eq "."} {
set c [string replace $c end end .]
} else {
foreach i {a b c} row $7segment($char) {
append $i $row " "
}
}
}
return $a\n$b\n$c
}
% num->7seg 12345.67890-Error
_ _ _ _ _ _ _ _ _
| _| _| |_| |_ |_ | |_| |_| | | _ |_ _ _ _ _
| |_ _| | _|.|_| | |_| _| |_| |_ | | |_| | MPJ : "Drive-by hacking" ... I added A,B,C,D,F so hex displays look right ;-) - RS: Thanks Mike, but that B is indistinguishable from 8, and D from 0... We'd have to use lowercase for these two:
B {{ } {|_ } {|_|}}
D {{ } { _|} {|_|}}
% num->7seg 012345.6789ABCDEF
_ _ _ _ _ _ _ _ _ _ _ _
| | | _| _| |_| |_ |_ | |_| |_| |_| |_ | _| |_ |_
|_| | |_ _| | _|.|_| | |_| _| | | |_| |_ |_| |_ | MPJ: You're right; I just saw that on LCD hexa panel.