Re: 3D axis labels orientation

[Jean Bréfort <jean brefort normalesup org>]

Le jeudi 07 août 2008 à 11:22 +0200, Emmanuel Pacaud a écrit :
> Le dimanche 03 août 2008 à 10:44 +0200, Jean Bréfort a écrit :
> > Le samedi 02 août 2008 à 22:07 +0200, Mariusz Adamski a écrit :
> > > Hi,
> > >
> > > I had some issues with labels padding, but i think i solved them
> > > finally. Now the axes are drawn horizontally when the axis angle <45
> > > degrees and vertically when it's >45 degrees. It's symmetric now, but
> > > maybe e.g. 90 +/- 10 would be a better choice. You can also substitute
> > >
> > >   style->text_layout.angle = (angle > 45. && angle < 135.)? 90. : 0.;
> > >
> > > with
> > >
> > >   style->text_layout.angle = (angle < 90)? angle : angle + 180;
> > >
> > > which draws labels parallel to the axis.
> >
> > Jody, Emmanuel, and all others: any comment or idea?
>
> I'm not sure to understand. Does that mean the user lost the control of
> the label angle ?

Not at all, just the automatic behaviour depends upon the axis
direction. If the user changes the angle, the angle he sets is used
whatever the axis direction.

> Some screenshots showing the difference between each solution would
> help.
>
> > Looks like we now have a decent support for surface plots in goffice :-)
>
> Very nice work indeed.
>
> I have some comments though.
>
> - I'm not sure we really need the 3D-box object. Perhaps the
> corresponding control could be moved in the 3d plot panel, while the 3d
> view parameters could be stored in the GogChart object (which would be
> similar to what's done for the plot area position/size properties).

I thought preferable to not add a lot of members to GogChart. Of course
we can change that.

> - It would be nice if the plot could be updated when changing the
> parameters.

The plot is updated only after the mouse button has been released
because we met some performance issues. It might be enough to just drop
duplicate events. 

> - The advanced and the rotation tabs could be merged. That would help to
> understand which axis psi, theta and phi refer to.

I feel that Euler's angles are not simple enough for most users. We
might at least display the field of view value in the rotation tab.

> - An isometric view would be great.

As well as other projection modes. At least excel and OOcalc behaviors
should be implemented.

> - The z axis should not be a discrete axis.

Do you have a sample where the z axis is discrete? With the samples I
have, it is not discrete.

> - I would have choosen another approach for the graph layout, where the
> user defines the depth of the plot area.

The field of view is used instead.

>  At least, it should be possible
> to set the z axis length.

TAs well as the y/x lengths ratio, IMHO.

Cheers,
Jean