Hi Rene,
I looked into it a bit further. Basically my question can be explained
by looking at the examples tornado.C and shapes.C in the tutorial.
In shapes.C I create some shapes attach them to a a node. And than draw
the top node. On the canvas (I don't mean the X3D view) I can rotate the
view anywhere in the canvas. If I turn on 'event status', I see that this
is because TView is always selected if not one of the shapes is 'near'.
This is what I mean with TView beging on the 'background', and it is the
effect I want to have.
No if I execute tornado.C I get something different. I can only rotate if
my mouse is near the tornado. If I am away from the tornado the canvas is
selected and NOT the TView.
My question is: Why is in the case of tornado not TView 'on the
background'?
Cheers,
Rutger
On Sat, 26 Feb 2000, Rene Brun wrote:
> Hi Rutger,
> The way you create TView is OK. I have to know a bit more about
> what your Track class is (how you draw it?) to come with a diagnostic.
> Look at $ROOTSYS/tutorials/tornado.C for a simple example.
> Did you derive your class from TAtt3D ?
> At least one 3-d object must be in the pad to get the view cursor.
>
> Rene Brun
>
>
> On Fri, 25 Feb 2000, Rutger van der Eijk wrote:
>
> > Hi,
> >
> > I want to be able to rotate a track which I draw on a canvas by using a
> > TView.
> >
> > I have some geometry description with the ROOT geometry classes. If I draw
> > the geometry on a canvas I am able to rotate it. The rotation is provided
> > by TView. I always get the rotation symbol if the TView is 'selected'
> > (i.e. shortest distanceToPrimitive; turning on 'Event Status' in canvas
> > tells me).
> >
> > I want to be able to do the same thing (rotate from a TView) with a track
> > that I paint. So as done in TNode::Draw() (which is called by
> > TGeometry::Draw()) I create a TView:
> >
> > if (!gPad) {
> > if (!gROOT->GetMakeDefCanvas()) return;
> > (gROOT->GetMakeDefCanvas())();
> > }
> > gPad->Clear();
> >
> > TView *view = gPad->GetView();
> > if (!view) {
> > view = new TView(1);
> > view->SetRange(-100, -250, 300, 100, 250, 1000);
> > // where the range is the range where the track can be present
> > }
> >
> > and after that draw by track
> >
> > The track is correctly painted, but I am not able to rotate the track
> > because TView is never 'selected'. Instead of TView the created canvas
> > (c1) is selected.
> >
> > Why doesn't this work? Or better why is TView selected after a geometry
> > draw, and in my simple case not?
> >
> > (I know I can use a TMarker3DBox to get a box which helps me rotate, but I
> > want to rotate without having to refer to the TMarker3DBox edges. Which
> > works with TView on the 'background', i.e. always 'selected' if no other
> > object is.)
> >
> > I have the feeling I am missing something trivial. But I seem not to be
> > able to figure out what. Can anyone show me the light?
> >
> > Thanks,
> >
> > Rutger
> >
> >
>
>
This archive was generated by hypermail 2b29 : Tue Jan 02 2001 - 11:50:20 MET