Re: strange behavior...

[Roland Bock <box2OO6 eudoxos de>]

Hi Zeev,

what auto_rescale does:

It takes the extrema of your values, adds a margin of x percent and 
calls set_total_limits.

Now, if your values represent a horizontal or vertical line, this leads 
to zero height or zero width. Thus, if you call auto_rescale while your 
data is one-dimensional, you will see that warning.

It seems to be a good idea to modify the auto_rescale function so that 
this effect does not occur anymore. I think I will do that in the next 
release.

This is what it probably will look like (not yet tested, though):

--------------------------
[...]
   if (extrema_success)
      return extrema_success;
   else
   {
      gfloat width = max_x - min_x;
      gfloat height = max_y - min_y;

      if (width == 0) width = max_x;
      if (height == 0) height = max_y;

      min_x -= border * width;
      max_x += border * width;
      min_y -= border * height;
      max_y += border * height;
   }
[...]
--------------------------

You may want to replace the original code in the gtkdatabox.c file.


Regards,

Roland

z pekar gmail com wrote:
> Hi Roland,
>
> I probably didn't understand you right, but it still doesn't work:
> just after the creation of the databox widget I set:
> gtk_databox_set_total_limits (GTK_DATABOX
> (s->getGui()->simulationPage.dataBoxThermosensor), -20, 20, -45, 45);
> without zeros (before there were, you are right)
> later during main loop iterations I put graphs (which are lines during
> first iterations) to the widget and autorescale it - they are displyed
> nicely, but unfortunately  with the error message in terminal:
> CRITICAL **: gtk_databox_set_total_limits: assertion `left != right &&
> top != bottom' failed.
>
> is there smth. to do about it?
> thank you
> Zeev
>
>
> On Fri, May 9, 2008 at 9:34 PM, Roland Bock <box2OO6 eudoxos de> wrote:
> > Hi Zeev,
> >
> > the message is given, if the vertical or horizontal latitude of your the
> > limits you set is zero. In such a case, the widget cannot reasonably
> > derive pixel coordinates from data values (maybe it could perform an
> > educated guess, but that is not implemented today).
> >
> > Thus, if you start with a line, you should use
> > gtk_databox_set_total_limits instead of ...auto_rescale.
> >
> > Regards,
> >
> > Roland
> >
> > z pekar gmail com wrote:
> > > Hi All,
> > > I have recently integrated gtkdatabox into my application and have
> > > following error message as long as the graph that I draw is a line (it
> > > is also not displayed):
> > > CRITICAL **: gtk_databox_set_total_limits: assertion `left != right &&
> > > top != bottom' failed
> > > only after it becomes a curve it starts being displayed and the error
> > > disappears. ( I use following code to display the graphs):
> > >
> > >                       graph = gtk_databox_lines_new (recordsNum,
> > >                                                                                       s->getParameters()->getThermosensor(i)->getTimeArray(),
> > >                                                                                       s->getParameters()->getThermosensor(i)->getTemperatureArray(),
> > >                                                                                       &color, 1);
> > >                       gtk_databox_graph_add (GTK_DATABOX
> > > (s->getGui()->simulationPage.dataBoxThermosensor), graph);
> > >                       gtk_databox_auto_rescale (GTK_DATABOX
> > > (s->getGui()->simulationPage.dataBoxThermosensor), 1);
> > >
> > > furthermore : gtk_databox_graph_remove_all doesn't seem to always work...
> > > I run a heavy computation in a separate thread(all the changes to gui
> > > happen in main thread using g_idle_add and a callback function) that
> > > uses 100% of CPU - could this fact cause the above mentioned problems?
> > >
> > > thank you in advance
> > > Zeev Pekar
> > > _______________________________________________
> > > gtkdatabox-list mailing list
> > > gtkdatabox-list gnome org
> > > http://mail.gnome.org/mailman/listinfo/gtkdatabox-list
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> > gtkdatabox-list gnome org
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