Am 26.02.2010 10:34, Albrecht Schlosser wrote:
> Am 26.02.2010 10:20, Matthew Lai wrote:
>> Is there a way to make a Fl_Chart have transparent background?
>
> Maybe
>
> chart2->box(FL_NO_BOX);
>
> or any frame box type.
>
> I didn't try this, though. It may not work.
At least there is a small drawback: whenever you change the contents
of *any* chart, you must assure that both charts will be drawn (and
chart #1 before chart #2). The easiest way would IMHO be to put both
charts in an Fl_Group like this:
Fl_Group *chart_group = new Fl_Group(...);
Fl_Chart *chart1 = new Fl_Chart(...); // assuming solid background
Fl_Chart *chart2 = new Fl_Chart(...);
chart2->box(FL_NO_BOX); // transparent
chart_group->end();
Whenever you change any chart, call either chart_group->redraw()
directly or call for instance chart2->parent()->redraw().
Of course the x/y/w/h values of both charts should be the same,
or chart1 should overlap chart2 completely.
That said, FLTK doesn't officially support overlapping widgets, but
I think that you wouldn't get problems with this approach.
Other than that, you would probably have to create your own chart
widget (maybe derived from Fl_Chart).
Albrecht
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