I think it's not so complicated,
You just have to add the displayListener only ONE time (the first).
If you had it two times, you will have two event, and so on...
"From: Bill Hibbard " wrote:
>
> Hi Tolga,
>
> I am about to leave for 2 weeks travel so won't be able
> to look into this for a while. However, if it really is
> true (i.e., do you really get 12 messages on the 12th new
> grid?) then a test program would be useful to help us
> recreate the problem.
>
> Cheers,
> Bill
> ----------------------------------------------------------
> Bill Hibbard, SSEC, 1225 W. Dayton St., Madison, WI 53706
> hibbard@xxxxxxxxxxxxxxxxx 608-263-4427 fax: 608-263-6738
> http://www.ssec.wisc.edu/~billh/vis.html
>
> On Sun, 24 Jun 2001, Tolga Sakman wrote:
>
> > Dear Don, Curtis and ALL,
> >
> > Thanks to Don's on and off line help, I was able to get the new grid to
> > show on the display. What I had to do was to do:
> >
> > display.removeAllReferences(); //display is a DisplayImplJ2D
> > display.clearMaps();
> > before attempting to display the new grid. However, I realized the
> > following -rather interesting- behavior: In the system.out of the following:
> >
> > display.addDisplayListener(new DisplayListener() {
> > public void displayChanged(DisplayEvent e) {
> > if(e.getId() == DisplayEvent.MOUSE_PRESSED_CENTER) { //
> > click left-right mouse buttons simultaneously.
> > xval = (float)displayRenderer.getDirectAxisValue(row);
> > yval =
> > (float)displayRenderer.getDirectAxisValue(column);
> > System.out.println( "> " + "X : " + xval + "\t\tY: " +
> > yval );
> > }
> > }
> > });
> >
> > I get one line with the initial grid, however, I get 2 lines (same line)
> > with the second grid read, 3 lines with the third grid read, so on and so
> > forth. So a click with the second grid gives:
> >
> > > X : 1.1516435 Y: -0.0683177
> > > X : 1.1516435 Y: -0.0683177
> >
> > as if all the displays are somehow on different layers, and the event is
> > caught by all of them, although they all have the ScalarMap range of the
> > last one read.
> >
> > Can you give some pointers as to what may be going on?
> >
> > Thanks,
> >
> > Tolga
> >
> >
> >
> >
> > ----- Original Message -----
> > From: Don Murray
> > To: Tolga Sakman
> > Cc: visad-list@xxxxxxxxxxxxx
> > Sent: Friday, June 22, 2001 10:48 AM
> > Subject: Re: Refreshing DisplayImplJ2D after loading a new file
> >
> >
> > Hi Tolga-
> >
> > > Tolga Sakman wrote:
> > > My application creates a DisplayImplJ2D, reads a simple grid from a
> > > default file and displays it. What it is is basically a square with
> > > axes labeled "X" and "Y", used as a placeholder for the grid that will
> > > be loaded.
> > >
> > > Then I use my custom container's (a swing gui) controls to select a
> > > file and feed it into my visaddisplay. What I want is the old display
> > > to disappear, and the new one show up. Apparently, just changing the
> > > dataset won't cut it; there are complications. Here's a stack trace:
> > >
> > > It gives a "visad.TypeException: ScalarType: name already used"
> > > stemming from ScalarType.java:186. Apparently it did not like the fact
> > > that I am trying to use the same row and column with the same names
> > > such as:
> > > row = new RealType("X", SI.meter, null);
> > > column = new RealType("Y", SI.meter, null);
> > > I presume the name "X" is where it cracks.
> >
> > RealTypes must be unique in VisAD. If you try to create a new RealType
> > of the same name, you will get the exception. One way around this is to
> > use the static RealType.getRealType() method which will return the
> > existing RealType or create a new one if there is not one yet defined.
> > If your data will always end up with RealTypes of row and column, then
> > you only need to create them once in the constructor as you did.
> >
> > > Then I try to "null"ify these objects if they != null, it does not
> > > work.
> > >
> > > Then I take these into the initial constructor so that they are not
> > > called when a new file is loaded. This does not throw exceptions, but
> > > does not display my new grid either. row and column still have their
> > > old ways, so does myDisplay (the DisplayImplJ2D reference).
> > >
> > > I try to myDisplay.destroy() if myDisplay != null, but it apparently
> > > never reaches there.
> >
> > How are you setting the data? You should just be able to call the
> > setData method on your DataReference with the new Data object. In this
> > case, the display should automatically update.
> >
> > > So after spending 4 hours of my night and bulk of this morning on
> > > this, my question is: How do you clear the display and show new data
> > > without killing the reference within the GUI and constructing a new
> > > one with the new chosen file?
> >
> > When you select the file, read it in and create a VisAD Data object and
> > then call setData with that object on your DataReference. The new data
> > should automatically appear in the display.
> >
> > Don
> > *************************************************************
> > Don Murray UCAR Unidata Program
> > dmurray@xxxxxxxxxxxxxxxx P.O. Box 3000
> > (303) 497-8628 Boulder, CO 80307
> > http://www.unidata.ucar.edu/staff/donm
> > *************************************************************
> >
