>
> To subscribers of the xforms list from "John Prinos" <t47851@perf2.dehavilland.ca> :
>
>
> Let's say that I have a form with an arbitrary number of xyplots. If I wanted
> to detect a mouse click and determine which xyplot was clicked on, would I use:
>
> Or, is there some way to determine which xyplot on the form was clicked on and
> then act?
>
I have a number of applications with the same requirement. When I want
complex interaction (cursor readout, click to set cursors, shift click
for postscript dump ....) I use a pre/posthandler to do this. See the
DEMOS for an example xyplot posthandler.
However if you simply want to click to select a plot I use a hidden
button over the xyplot, which returns a code identifying the xyplot to
a common callback routine . This is easy to set up and works perfectly
well. I name the xyplots xyp[0], xyp[1] ... and set the argument to
the button callback to the corresponding index. The button callback
then looks like:
void hb_cb(FL_OBJECT *ob, long i)
{
FD_gui *fd = ob->form->fdui;
if(fd->xyp[i] == NULL) return;
... do whats needed to fd->xyp[i] ..
}
Ivan
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___ ___/ _ __ / Ivan Powis TEL: +44-115-951-3467 |
/ / / Department of Chemistry FAX: +44-115-951-3562 |
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/ ___/ Nottingham NG7 2RD |
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