> Jos Dreesen wrote:
> > This works, i get a more or less usable display.
> > But at the expected cost of some flicker.
>
> As Ian mentioned, use an Fl_Double_Window instead of
> Fl_Window. That should prevent seeing drawing operations
> as they run.
The flickering was caused by me calling the draw directly, instead of just
setting the damage bits. (A timer called the redraw 10 times a second).
>
> >> Or, don't do that and just make sure the widget you're deriving
> >> from has a solid box() type type of some kind, likebox(FL_FLAT_BOX).
> >> This way when the widget redraws, it won't leave the old image behind.
> >
> > This does not work.
>
> Hmm, would have to see your code to know why that doesn't work.
> Maybe your draw() function isn't calling the underlying widget's
> draw() first, short circuiting the widget's ability to draw itself.
This was indeed the case. Thanks, this now works OK ( new to FLTK...)
My redraw routine is now as follows :
----------------------------------------------------------
void draw() {
int x, dmg;
dmg=damage();
if (dmg & DmgDsp) /* update Lilith display, redraws Fl_Bitmap */
{ Fl_Box::color(BackCol);
Fl_Box::draw(); /* redraw background */
fl_color(FrontCol);
ldsp-> draw(border, border+border/2); /* redraw bitmap */
}
if (dmg & DmgGui) /* redraw ornamental boxes */
{ x=DspSplit+10;
fl_color(FL_BLUE);
if (SimDspBrdr)
{ dbox(" Lilith display ",border/2, border, 480,
LilDspWidth+border, LilDspHeight+border );
dbox(" Disk ", x-border/2, yd-border/2, 20, 312, 80 ); /*
disk box */
dbox(" Speed ", x-border/2, ys-border/2, 20, 312, 42 ); /*
speed box */
dbox(" Message box ", x-border/2, yt-border/2, 20, 312,
TxtBoxH+border ); /* message box */
}
logo-> draw(DspSplit, border/2);
}
}
-----------------------------------------------------------------
One last question : is there a better way the handle the colors as just setting
background and foreground them each time I redraw the "ldsp" bitmap ? ( the
colors can switch between blackonwhite and whiteblack )
Jos
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