exception cannot call getImage() from Thread: AWT-EventQueue-1

[ncubukcu]

Thanks Curtis
I think I got it working now.  You are right that my 
com.app.lt.CreateImage throws me an image using getImage(). I don't know 
any other way of creating an image in  visad.   Is there a shorter way 
to add scalar maps to an image other than what I use below? 
.
.
    contMap = new ScalarMap( field, Display.IsoContour );
    colMap = new ScalarMap( longitude, Display.XAxis );
    rowMap = new ScalarMap( latitude,    Display.YAxis );
    pixMap = new ScalarMap( field,  Display.RGB );
    DisplayImplJ2D display = new DisplayImplJ2D(" ", 700, 500);
 
    GraphicsModeControl dispGMC = (GraphicsModeControl) 
display.getGraphicsModeControl();
    dispGMC.setScaleEnable(true);

    // Add maps to display
    display.addMap( colMap );
    display.addMap( rowMap );
    display.addMap( pixMap );
    display.addMap( contMap );
   // Create a data reference and set the FlatField as our data
    DataReferenceImpl data_ref = new DataReferenceImpl("data_ref");
    data_ref.setData( mapField );
    // Add reference to display
    display.addReference( data_ref ); 
    return display.getImage(); 


Thanks again for your help
nihat



Curtis Rueden wrote:

> Hi Nihat,
>
> There are restrictions on calling DisplayImpl.getImage from the AWT 
> event thread, because doing so generally results in thread deadlock. 
> Instead, try calling getImage from a completely separate thread. E.g.:
>
> private void jButton1ActionPerformed(java.awt.event.ActionEvent evt) {
>    new Thread() {
>        public void run() {
>            com.app.lt.CreateImage imagePr = new com.app.lt.CreateImage();
>            try {
>                BufferedImage myImage =imagePr.plotImage();
>            } catch (RemoteException ex) {
>                ex.printStackTrace();
>            } catch (VisADException ex) {
>                ex.printStackTrace();
>            }
>        }
>    }.start();
>    ...
> }
>
> Also, I'm not certain what com.app.lt.CreateImage.plotImage does, but 
> from its name, it sounds like it builds or updates a display with 
> DataReferenceImpl.setData and such -- is there a reason such a method 
> would need to call getImage? If you can avoid the getImage call, you 
> can continue using the AWT event thread, if you wish.
>
> -Curtis
>
> ncubukcu wrote:
>
>> Hi
>> I am pretty new to visad and currently exploring its usage for my 
>> applications. So far I was able to write some simple applications.
>>
>> I have run into a problem when I tried to call a visad application 
>> through and applet's "submit" button on a web site  as in the 
>> following format:
>>
>> private void jButton1ActionPerformed(java.awt.event.ActionEvent evt) 
>> {                                                  
>> Util.invoke(false,false, new Runnable() {
>>            public void run() {
>>            com.app.lt.CreateImage imagePr = new 
>> com.app.lt.CreateImage();
>>                try {
>>                    BufferedImage myImage =imagePr.plotImage();
>>                } catch (RemoteException ex) {
>>                    ex.printStackTrace();
>>                } catch (VisADException ex) {
>>                    ex.printStackTrace();
>>                }
>>            }
>>        });
>> .
>> .
>>
>> the exception I get is;
>>
>> Exception in thread "AWT-EventQueue-1" visad.VisADError: cannot call 
>> getImage() from Thread: AWT-EventQueue-1
>>        at visad.DisplayImpl.getImage(DisplayImpl.java:2630)
>>        at visad.DisplayImpl.getImage(DisplayImpl.java:2614)
>>        at com.app.lt.CreateImage.plotImage(CreateImage.java:94)
>>
>> where line 94 has the following code;
>> return display.getImage();
>>
>> and display object is;
>> DisplayImplJ2D display = new DisplayImplJ2D(" ", 700, 500);
>>
>> I looked through old e.mails and it seems like this  works for 
>> everybody else. It works fine if I run the application by itself. 
>> Like I said I am  a new user and there maybe much easier way to do 
>> this but I just don't know yet.  any help is greatly appreciated... 
>> thanks in advance..
>> nihat
>
>
>
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