I tested this, and found setting positioner->bw = 0
makes everything all right. I think in your
test code, you might've used fl_set_object_bw(ob, 0),
which unfortunately does not work as that function
ignores 0 border width request.
On Dec 25, 11:25am, Steve Lamont wrote:
> Subject: Re: XForms: aligning positioner to xyplot
> To subscribers of the xforms list from spl@szechuan.ucsd.edu (Steve Lamont) :
>
> > From "T.C. Zhao" <zhao@bloch.phys.uwm.edu> :
> >
> > > To subscribers of the xforms list from "GERALD POLLACK"
> > >
> > > getting the bounds of the plotted data, using fl_get_xyplot_xbounds
> > > and fl_get_xyplot_ybounds;
> > > converting these bounds to screen coords with fl_xyplot_w2s;
> > > using the screen coords to set up the positioner's geometry with
> > > fl_set_object_geometry;
> > >
> > > But, the positioner ended up too small; the cursor cannot be placed
> > > over the extreme left, right, top or bottom portions of the plot.
> >
> > I haven't tried, but I think if you set positioner_obj->bw = 0,
> > the alignment should be better. I think the library should do
> > this automatically.
>
> I tested this and there's still a small but signifcant discrepency
> between the value calculated by the positioner and the value you get
> if you use fl_get_form_mouse() and fl_xyplot_s2w(), where the latter
> value is closer to being correct.
>
> Another thing I noted in experimenting with this is that if you resize
> the Window, the crosshairs do not intersect at the same point relative
> to the underlying plot in the resized window. I don't know if this is
> relevant to the problem above but it is indicative of some sort of
> scaling issue.
>
> spl
>
>
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>-- End of excerpt from Steve Lamont
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