drawing a Barcode without a Barcode font

Mike Bonner bonnmike at gmail.com
Fri Jul 20 11:31:43 CEST 2018


Very cool!  Does it actually produce a code that can be scanned?

On Fri, Jul 20, 2018 at 3:25 AM Matthias Rebbe via use-livecode <
use-livecode at lists.runrev.com> wrote:

> Mike
>
> you´re awesome. That is already an almost complete solution to my
> question. Never had expected that. Thank you very much.
> I´ve made some little changes. One among of them is:
> To have all the separate bars of the barcode in a group, i changed the
> lines where the grc is cloned
> to for example        copy grc “narrowB” to grp “barcode2of5”
>
> Here´s now my code to convert the nNnNN…. string to Barcode
>
> local tLast
> on mouseup
>    if there is a grp "barcode2of5" then delete grp "barcode2of5"
>    -- now change the width of the template graphics
>    put "2" into tNarrow
>    put "4" into tWide
>    set the width of grc "narrowC" to tNarrow
>    set the width of grc "narrowB" to tNarrow
>    set the width of grc "wideC" to tWide
>    set the width of grc "wideB" to tWide
>    put "0" into tHorAdjust -- allows to put a gap beween the separate bars.
>    put "60,286" into tBarTopLeft -- defines where the first bar is placed
>    put empty into tLast
>    put fld "2of5" into tChars -- the field with your wNnnW string
>    set the casesensitive to true -- to differentiate case of course
>    create grp "barcode2of5"
>    repeat for each char tChar in tChars
>       switch tChar
>          case "N"
>             -- checks the char, and clones the matching bar.
>             --if its the first time through, places it at astart location
>             -- then uses the id of the most recent bar forplacement
> purposes
>             --clone grc "narrowB"
>             copy grc "narrowB" to grp "barcode2of5"
>             if tLast is empty then
>                set the topleft of the last grc to tBarTopLeft
>             else
>                set the topleft of the last grc to horAdjust(tHorAdjust)
>             end if
>             break
>          case "n"
>             --clone grc "narrowC"
>             copy grc "narrowC" to grp "barcode2of5"
>             if tLast is empty then
>                set the topleft of the last grc to tBarTopLeft
>             else
>                set the topleft of the last grc to horAdjust(tHorAdjust)
>             end if
>             break
>          case "W"
>             --clone grc "wideB"
>             copy grc "wideB" to grp "barcode2of5"
>             if tLast is empty then
>                set the topleft of the last grc to tBarTopLeft
>             else
>                set the topleft of the last grc to horAdjust(tHorAdjust)
>             end if
>             break
>          case "w"
>             --clone grc "widec"
>             copy grc "widec" to grp "barcode2of5"
>             if tLast is empty then
>                set the topleft of the last grc to tBarTopLeft
>             else
>                set the topleft of the last grc to horAdjust(tHorAdjust)
>             end if
>             break
>       end switch
>       put the short id of the last grc into tLast -- the id of the most
> recently placed bar
>    end repeat
>    set the height of grp "barcode2of5" to 69
>    set the width of grp "barcode2of5" to 360
> end mouseup
>
> --This function allows a horizontal adjustment of the single bars.
> function horAdjust tHorAdjust
>    put the topright of grc id tLast into tTMP
>    set the itemdelimiter to ","
>    add tHorAdjust to item 1 of tTMP
>    return tTMP
> end horAdjust
>
> Again, thank you very much for your help.
>
> Regards,
>
> Matthias
>
>
> > Am 20.07.2018 um 01:01 schrieb Mike Bonner via use-livecode <
> use-livecode at lists.runrev.com>:
> >
> > Not sure if it will work for your purpose, but as a test I created for
> > graphic lines, 1 narrow black, 1 wider black, duplicated them and set the
> > blendlevel of the copies so that they're transparent.
> >
> > Grcs are named narrowB, wideB, narrowC and wideC (b for black, c for
> clear)
> >
> > Then used the following code (and your example string from above with the
> > WWnNw stuff) to generate a barcode.
> >
> > on mouseup
> >   put empty into tLast
> >   put field 1 into tChars -- the field with your wNnnW string
> >   set the casesensitive to true -- to differentiate case of course
> >   repeat for each char tChar in tChars
> >      switch tChar
> >         case "N" -- checks the char, and clones the matching bar.
> >                        --if its the first time through, places it at a
> > start location
> >                        -- then uses the id of the most recent bar for
> > placement purposes
> >            clone grc "narrowB"
> >            if tLast is empty then
> >               set the topleft of the last grc to 10,50
> >            else
> >               set the topleft of the last grc to the topright of grc id
> > tLast
> >            end if
> >            break
> >         case "n"
> >            clone grc "narrowC"
> >            if tLast is empty then
> >               set the topleft of the last grc to 10,50
> >            else
> >               set the topleft of the last grc to the topright of grc id
> > tLast
> >            end if
> >            break
> >         case "W"
> >            clone grc "wideB"
> >            if tLast is empty then
> >               set the topleft of the last grc to 10,50
> >            else
> >               set the topleft of the last grc to the topright of grc id
> > tLast
> >            end if
> >            break
> >         case "w"
> >            clone grc "widec"
> >            if tLast is empty then
> >               set the topleft of the last grc to 10,50
> >            else
> >               set the topleft of the last grc to the topright of grc id
> > tLast
> >            end if
> >            break
> >
> >      end switch
> >      put the short id of the last grc into tLast -- the id of the most
> > recently placed bar
> >   end repeat
> > end mouseup
> >
> > Spacing and line size might need to be tweaked, but it seems like this
> > would be relatively straight forward.
> >
> > On Thu, Jul 19, 2018 at 4:30 PM Bob Sneidar via use-livecode <
> > use-livecode at lists.runrev.com> wrote:
> >
> >> I think the trick will be drawing large graphics one at a time and
> >> properly spaced at several times their finished size, perhaps off
> screen,
> >> then getting a snapshot of the result and scaling it down. Not sure how
> >> picky the readers will be.
> >>
> >> Bob S
> >>
> >>
> >>> On Jul 19, 2018, at 15:06 , Matthias Rebbe via use-livecode <
> >> use-livecode at lists.runrev.com> wrote:
> >>>
> >>> Currently i am using a special 2of5i barcode font. The font .has only
> >> four characters (bars) in its set.
> >>> The code displays a
> >>> narrow space (blank) bar when the character is n
> >>> narrow black bar when N
> >>> wide space when w
> >>> wide black bar when W
> >>
> >>
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