> I'm confused with the way fl_line works.
> In my own widget I redefined the draw method as follow:
>
> void MyWidget::draw()
> {
> Fl_Group::draw();
> fl_color(FL_BLACK);
> fl_line_style( FL_DOT, 1);
>
> fl_push_clip(x(), y(), w(), h());
>
> fl_line(20, 50, 20, 100);
>
> fl_pop_clip();
> }
>
> In that case the line drawn is 50px and not 100px, so I guess that
> the line actually starts at the top of the widget
> so the proper way to get a 100px line should be:
This is fltk-1 I think?
Probably you are caught out because drawing takes palce relative to the
parent window in fltk-1, *not* relative to the widget origin. (There are
complex reasons about why this is or is not a good idea, but moving
on...)
So, you maybe need to do like this:
void MyWidget::draw()
{
int xo = x();
int yo = y();
Fl_Group::draw();
fl_color(FL_BLACK);
fl_line_style( FL_DOT, 1);
fl_push_clip(x(), y(), w(), h());
fl_line(xo + 20, yo + 50, xo + 20, yo + 100);
fl_pop_clip();
}
As an alternative, you can probably use fl_translate() to shift the
drawing origin to your widget co-ordinates once you have pushed the
clip...
void MyWidget::draw()
{
int xo = x();
int yo = y();
Fl_Group::draw();
fl_color(FL_BLACK);
fl_line_style( FL_DOT, 1);
fl_push_clip(x(), y(), w(), h());
fl_push_matrix();
fl_translate(xo, yo);
fl_line(20, 50, 20, 100);
fl_pop_matrix();
fl_pop_clip();
}
Something like that, anyway.
NOTE: I just typed this up without checking the docs, so this may not
work - but the idea is right, so hopefully it will show you how to
proceed...
--
Ian
SELEX Sensors and Airborne Systems Limited
Registered Office: Sigma House, Christopher Martin Road, Basildon, Essex SS14
3EL
A company registered in England & Wales. Company no. 02426132
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