Hi Mathias,
This NullPointerException comes from deep inside Java3D and is probably
a Java3D problem. Line 662 of DisplayRendererJ3D.java is not a call to
draw() in the current VisAD, but there may be a line numbering difference
in your JVM.
I was however able to get direct manipulation in the SpreadSheet by
temporarily editting the BasicSSCell.setMaps() method, changing:
VDisplay.addReference(dr[i], cmaps[i]);
to:
VDisplay.addReferences(new DirectManipulationRendererJ3D(), dr[i], cmaps[i]);
Note this causes Exception messages in the 3-D window if the data's
MathType is not compatible with DirectManipulationRendererJ3D, but I
was able to drag the data for data with a RealType.
Changing the BasicSSCell.addReferenceImpl() method did not have any
affect for me.
Cheers,
Bill
> A few weeks ago I asked if there is a possibility to add data to a SSCell
> with an alternativ DataRenderer especially a
> DirectManipulationRendererJ3D. Curtis told me to extend FancySSCell. Now I
> found the time to do this and got some problems. Below are the two
> methods that extend the FancySSCell to allow the addition of a DataReference
> with an alternative renderer:
>
> public String addReference(DataReferenceImpl ref, DataRenderer renderer,
> ConstantMap[] cmaps)
> throws VisADException, java.rmi.RemoteException {
> SSCellData cellData;
> synchronized (CellData) {
> cellData = addReferenceImpl(0, ref, cmaps, "", DIRECT_SOURCE, true,
> true, renderer);
> }
> return cellData.getVariableName();
> }
>
> protected SSCellData addReferenceImpl(int id, DataReferenceImpl ref,
> ConstantMap[] cmaps, String source, int type, boolean notify,
> boolean checkErrors, DataRenderer renderer)
> throws VisADException, java.rmi.RemoteException {
> if (id == 0) id = getFirstFreeId();
> if (ref == null) ref = new DataReferenceImpl(Name);
> if (notify) sendMessage(ADD_DATA, source, ref.getData());
> SSCellData cellData
> new SSCellData(id, this, ref, cmaps, source, type, checkErrors);
> CellData.add(cellData);
> if (!IsRemote) {
> if (HasMappings) VDisplay.addReferences(renderer, ref, cmaps);
> synchronized (Servers) {
> RemoteDataReferenceImpl remoteRef
> (RemoteDataReferenceImpl) cellData.getRemoteReference();
> int len = Servers.size();
> for (int i=0; i<len; i++) {
> RemoteServerImpl rs = (RemoteServerImpl) Servers.elementAt(i);
> rs.addDataReference(remoteRef);
> }
> }
> }
> return cellData;
> }
>
> The addition (with a DirectManipulationRendererJ3D) of the data works without
> problems. But if I try to move my datapoints with the right
> mouse button I get this exception:
>
> Exception occurred during Canvas3D callback:
> java.lang.NullPointerException: null component
> at sun.awt.windows.WDrawingSurfaceInfo.lock(Native Method)
> at
> javax.media.j3d.DrawingSurfaceObjectDSI.renderLock(DrawingSurfaceObjectDSI.java:60)
> at javax.media.j3d.GraphicsContext3D.doDraw(GraphicsContext3D.java:1821)
> at javax.media.j3d.GraphicsContext3D.draw(GraphicsContext3D.java:2059)
> at
> visad.java3d.DisplayRendererJ3D.drawCursorStringVector(DisplayRendererJ3D.java:662)
> at visad.java3d.VisADCanvasJ3D.renderField(VisADCanvasJ3D.java:76)
> at javax.media.j3d.Renderer.doWork(Renderer.java:940)
> at javax.media.j3d.J3dThread.run(J3dThread.java:256)
> I was not able to locate the error. I'm not sure if I forget anything to
> implement in my methods. Perhaps I should extend the SSCellData-class
> too. But then I would lose all the compatibility to any other SSCell. Are
> there any ideas what to do?
>
> Thanks in advance, Mathias
--
----------------------------------------------------------
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
