[Jprogramming] sysdata in the isigraph char event

[Jimmy Miller]

Thanks for the reply.  I got to the point where I could test for
individual letter keys, but I'm still having trouble with the arrows.
If I try to test for the characters that correspond to the arrow keys,
like ┤:

test_pic_char =: 3 : 0
if. sysdata = '┤' do.
wd 'setxywh pic 0 0 150 150'
end.
)

I get a 'length error' when the program runs.  Any ideas?

On 6/3/07, Chris Burke <cburke at jsoftware.com> wrote:
> Jimmy Miller wrote:
> > I've been trying to get an isigraph to move to a certain location when
> > the user presses the up arrow key.  I figured out how to get it to
> > move based on any key:
> >
> > test_pic_char =: 3 : 0
> > wd 'setxywh pic 0 0 150 150'
> > )
> >
> > But I'm unsure how to detect the up key.  Based on the isigraph events
> > page (http://www.jsoftware.com/help/user/isigraph_events.htm), I
> > figured sysdata would be 21 when the user presses the up key:
>
> The datatype of sysdata is always character. The numbers shown are the
> indices of the character values in a. (alphabet).
>
> You can just press a key, observe the value of sysdata, and then program
> for that value.
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> For information about J forums see http://www.jsoftware.com/forums.htm
>


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