On 5/31/05, John H. Robinson, IV <[EMAIL PROTECTED]> wrote:
> John H. Robinson, IV wrote:
> > m ike wrote:
> > > this
> > >
> > > convert -draw "line 10,10,20,20" text.jpg out.jpg
> > >
> > > draws a line on the image from 10,10 to 20,20
> > >
> > > so does this:
> > >
> > > g="line 10,10,20,20"
> > > convert -draw "$g" text.jpg out.jpg
> > >
> > > but this chokes:
> > >
> > > g='-draw "line 10,10,20,20"'
> > > echo $g
> > > convert $g text.jpg out.jpg
> > >
> > > appearantly convert is seeing "line 10,10,20,20" as two
> > > arguments, divided at the space.
> > >
> > > I'm at a loss. any ideas?
> >
> > Use a better shell:
> >
> > in zsh:
> >
> > % g=(-draw "line 10,10,20,20"); convert -fill black $g mushroom.jpg X:-
> >
> > That makes a pretty diagonal line, just as you expect.
>
> However, if you *insist* upon using bash:
>
> $ typeset -a g
> $ g=(-draw "line 10,10,20,20")
> $ convert -fill black "[EMAIL PROTECTED]" mushroom.jpg X:-
>
> Note the arcane syntax for the expansion of the environmental variable
> g. You must use the quotes, otherwise it does not work as desired.
>
> > -john
Maybe what you need to do is step back from the problem and write your
own "little language" interpreter that does nothing but take in
line-drawing specifications and turn them into properly formatted
input for "convert". That way you don't have to fit the input
language to a pre-existing interpreter (shell).
See various books by Brian Kernighan with discussion of "little languages".
carl
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