Thank you!
That was the trouble!
Thanks again.
Luigi
Edward A. Lee wrote:
>
> The only possibility that occurs to me is that the method
> plot.export(out_image) is getting executed before the last
> plot.addPoint() is executed. To test this theory,
> try placing at least plot.export(out_image) in the event
> thread, using code like this:
>
> Runnable doExport = new Runnable() {
> public void run() {
> plot.export(out_image);
> }
> };
> try {
> SwingUtilities.invokeLater(doExport);
> } catch (InterruptedException ex) {
> // Ignore InterruptedException.
> // Other exceptions should not occur.
> }
>
> To do this, out_image will have to be declared "final".
>
> The reason for this is that add_point's action is deferred to
> execute in the event thread. It is arguable that probably export()
> should be as well...
>
> Edward
>
>
> At 12:23 PM 7/1/2002 +0200, Luigi Paioro wrote:
>
>> Hello to everybody!
>>
>> I'm using the PtPlot classes to plot some dynamic charts that are
>> elaborated by a Java Servlet. I don't know why, but if I plot more
>> time the same dataset (and also not the same!), my Plot losts some
>> points... but not always the same number... it seems that the
>> addPoint(...) method fails over a random number of points added.
>>
>> My plot cames from a POST method on my servlet that make a query on a
>> database and plot the result adding the values of the two columns
>> selected:
>>
>> Plot plot = new Plot();
>>
>> plot.setButtons(false);
>> plot.setConnected(false);
>> plot.setImpulses(false);
>> plot.setBars(false);
>> plot.setMarksStyle("various");
>> plot.setBackground(Color.white);
>>
>> Statement stmt = null;
>> ResultSet result = null;
>>
>> stmt = Cnn.createStatement();
>> result = stmt.executeQuery(sql);
>>
>> while (result.next()) {
>> int i = result.findColumn(fieldx1);
>> int j = result.findColumn(fieldy1);
>> String sx = result.getString(i);
>> String sy = result.getString(j);
>> double x = (Double.valueOf(sx)).doubleValue();
>> double y = (Double.valueOf(sy)).doubleValue();
>> plot.addPoint(0, x, y, false);
>> }
>>
>> fieldx1 and fieldy1 come from the HTML form... they are just the
>> column name, and the sql string is the SQL statement.
>>
>> In the end I send an EPS to the browser OutputStream:
>>
>> OutputStream out_image = response.getOutputStream();
>> response.setContentType("application/postscript");
>> plot.export(out_image);
>>
>> It's a simple code, but if I run it more times, it losts some
>> points... it seems that the servlet cannot plot more points than a
>> break point that variates each time. Note that it is not a SQL
>> trouble: the query works fine!
>>
>> What about this?
>>
>> Thank, Luigi.
>>
>> --
>>
>> Dr. Luigi Paioro
>>
>> C.N.R. - I.A.S.F.
>>
>> Consiglio Nazionale delle Ricerche
>>
>> Istituto di Astrofisica Spaziale e
>> Fisica Cosmica "G.P.S. Occhialini"
>>
>> via Bassini 15, I-20133 Milano, Italy
>>
>> e.mail: [EMAIL PROTECTED]
>> phone: +39 02 23699349
>> fax: +39 02 2666017
>>
>>
>> ----------------------------------------------------------------------------
>>
>> Posted to the ptolemy-hackers mailing list. Please send administrative
>> mail for this list to: [EMAIL PROTECTED]
>
>
> ------------
> Edward A. Lee, Professor
> 518 Cory Hall, UC Berkeley, Berkeley, CA 94720
> phone: 510-642-0455, fax: 510-642-2739
> [EMAIL PROTECTED], http://ptolemy.eecs.berkeley.edu/~eal
>
--
Dr. Luigi Paioro
C.N.R. - I.A.S.F.
Consiglio Nazionale delle Ricerche
Istituto di Astrofisica Spaziale e
Fisica Cosmica "G.P.S. Occhialini"
via Bassini 15, I-20133 Milano, Italy
e.mail: [EMAIL PROTECTED]
phone: +39 02 23699349
fax: +39 02 2666017
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