gmane.comp.graphics.qwt.general

Re: Overloaded QwtPlotPicker::trackerText but no text near mousepointer

Giuseppe Calà — 2008-07-04T08:51:36

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Re: Overloaded QwtPlotPicker::trackerText but no text near mousepointer

Giuseppe Calà — 2008-07-03T10:30:20

I'm using QT 4.4 Bye On Thursday 03 July 2008 12:22:51 Joey Mukherjee wrote: ------------------------------------------------------------------------- Sponsored by: SourceForge.net Community Choice Awards: VOTE NOW! Studies have shown that voting for your favorite open source project, along with a healthy diet, reduces your potential for chronic lameness and boredom. Vote Now at http://www.sourceforge.net/community/cca08 _______________________________________________ qwt-interest mailing list qwt-interest< at >lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/qwt-interest

Re: Overloaded QwtPlotPicker::trackerText but no text near mousepointer

Joey Mukherjee — 2008-07-03T10:22:51

Re: Overloaded QwtPlotPicker::trackerText but no text near mousepointer

Giuseppe Calà — 2008-07-03T09:13:44

Re: Overloaded QwtPlotPicker::trackerText but no text near mousepointer

Uwe Rathmann — 2008-07-03T06:21:09

Your code also works in the spectrogram example of qwt-svn. Uwe ------------------------------------------------------------------------- Sponsored by: SourceForge.net Community Choice Awards: VOTE NOW! Studies have shown that voting for your favorite open source project, along with a healthy diet, reduces your potential for chronic lameness and boredom. Vote Now at http://www.sourceforge.net/community/cca08 _______________________________________________ qwt-interest mailing list qwt-interest< at >lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/qwt-interest

Re: Overloaded QwtPlotPicker::trackerText but no text near mousepointer

Giuseppe Calà — 2008-07-02T20:00:08

RE: QwtPlot->print on QPrinter

David Stranz — 2008-07-02T18:10:51

Hi Uwe, Ah, here's a difference: In bode.cpp, MainWin::exportSVG(), you call "d_plot->print(generator);" this produces a correct SVG file. If you replace this with "d_plot->render(&generator);" then the SVG is incorrect, with multiple etc. That is what I am doing in my EMF output. I will check to see if I get correct output if I print instead of render. Regards, David _______________________________________________________________ David Stranz, Ph.D.david_stranz< at >MassSpec.com Sierra Analytics, Inc. 5815 Stoddard Road, Suite 601 Modesto, CA 95356 Tel: (209) 545-8508 http://www.massspec.com _______________________________________________________________ ------------------------------------------------------------------------- Sponsored by: SourceForge.net Community Choice Awards: VOTE NOW! Studies have shown that voting for your favorite open source project, along with a healthy diet, reduces your potential for chronic lameness and boredom. Vote Now at http://www.sourceforge.net/c

Re: Overloaded QwtPlotPicker::trackerText but no text near mousepointer

Uwe Rathmann — 2008-07-02T18:11:11

I checked this code in the spectrogram example with Qwt 5.1 and Qt 4.4.0 on Linux/X11 without any problems. Uwe PS1: If you want to convert a number better use QString. F.e: QString yValue; yValue.setNum(pos.y()); PS2: If you want to convert a double to an int use qRound() or simple cast it. ------------------------------------------------------------------------- Sponsored by: SourceForge.net Community Choice Awards: VOTE NOW! Studies have shown that voting for your favorite open source project, along with a healthy diet, reduces your potential for chronic lameness and boredom. Vote Now at http://www.sourceforge.net/community/cca08 _______________________________________________ qwt-interest mailing list qwt-interest< at >lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/qwt-interest

Re: QwtPlot->print on QPrinter

Uwe Rathmann — 2008-07-02T17:57:43

QwtPlotCanvas uses an internal pixmap cache, but QwtPlot::print paints straight to the output device without any buffering. Could you try to catch one of the questionable situations in the debugger and post the stack ? Uwe ------------------------------------------------------------------------- Sponsored by: SourceForge.net Community Choice Awards: VOTE NOW! Studies have shown that voting for your favorite open source project, along with a healthy diet, reduces your potential for chronic lameness and boredom. Vote Now at http://www.sourceforge.net/community/cca08

Re: QwtPlot->print on QPrinter

Uwe Rathmann — 2008-07-02T17:51:23

I tried the bode example on Linux/X11 with Qt 4.4.0: there are no multiple and

RE: QwtPlot->print on QPrinter

David Stranz — 2008-07-02T15:21:09

Uwe, the contents of the QwtPlot canvas are being drawn to a pixmap before being copied to the output device. For example, if I draw ellipses as QwtPlotItems, I never see corresponding calls to my QPaintEngine::drawEllipse() method. I only see calls to primitives for the axes and labels. The canvas is drawn using a single QPaintEngine::drawPixmap() call. Is there any way to override this behavior without modifying the QwtPlot code? When painting to a metafile, I would like to output actual graphics primitives so scaling works better when the metafile is pasted into a document. Thanks, David _______________________________________________________________ David Stranz, Ph.D.david_stranz< at >MassSpec.com Sierra Analytics, Inc. 5815 Stoddard Road, Suite 601 Modesto, CA 95356 Tel: (209) 545-8508 http://www.massspec.com _______________________________________________________________ ------------------------------------------------------------------------- Sponsored by: SourceForge.net Community C

RE: QwtPlot->print on QPrinter

David Stranz — 2008-07-02T14:55:23

Hello Uwe, You can demonstrate the problem with just a bare naked QwtPlot. The output from this is an SVG file named "foo.svg". The multiple and

Overloaded QwtPlotPicker::trackerText but no text near mouse pointer

Giuseppe Calà — 2008-07-02T13:51:14

Re: QwtPlot->print on QPrinter

Uwe Rathmann — 2008-07-02T06:34:10

I checked the bode example with Qt 4.4.0 on X11, what seems to work. In earlier Qt 4 versions I had several effects, where the PDF output was broken, depending on the content of the plot. I guess you have such a problem here too. 1) What happens if you print to postscript ? 2) If I were in your shoes I would try identify which paint operations makes Qt to fail. For this I would print one plot only and to strip down its content. In the next step you can do the same paint operations without Qwt and send them as small demo to TrollTech. I know finding Qt bugs this way is very cumbersome, but a small demo is the only way you can submit a bug report, that has a chance to get fixed. Uwe ------------------------------------------------------------------------- Sponsored by: SourceForge.net Community Choice Awards: VOTE NOW! Studies have shown that voting for your favorite open source project, along with a healthy diet, reduces your potential for chronic lameness and boredom. Vote Now at http://www.so

Re: QwtPlot->print on QPrinter

Uwe Rathmann — 2008-07-02T06:22:38

There might be additional painters for different paint devices ( f.e. for temporary pixmaps ), but I'm not aware that it is possible to have more than painter for the same device. Of course the different devices might use the same engine ( like QWidget and QPixmap on X11 ). What combination is the reason for the problems ? Uwe ------------------------------------------------------------------------- Sponsored by: SourceForge.net Community Choice Awards: VOTE NOW! Studies have shown that voting for your favorite open source project, along with a healthy diet, reduces your potential for chronic lameness and boredom. Vote Now at http://www.sourceforge.net/community/cca08

RE: QwtPlot->print on QPrinter

David Stranz — 2008-07-01T20:02:43

Uwe and Christian, I don't know if this is related, but I have recently implemented a Windows Enhanced Metafile paint engine / paint device to create EMF files for copy / paste. I discovered that when trying to output a QwtPlot, there are multiple instances of QPainter created as different sub-items within the QwtPlot are rendered. This results in multiple calls to QPaintEngine::begin() and end(). If code to initialize and terminate output are put into these methods (as is usual), then the multiple invocations will result in an incorrect metafile (it will have multiple EMR_HEADER and EMR_EOF records, which is not correct). I discovered the same thing happens with Qt's QSVGGenerator when trying to render a QwtPlot. The result is an invalid SVG file that has multiple and

Re: QwtPlot->print on QPrinter

Christian Lackas — 2008-07-01T19:38:32

* Uwe Rathmann tigertal.de> [080701 21:19]: Hi Uwe, thanks for your quick reply. the intended 4.3.2 plots show four parts, consisting of a black ellipse with colored smaller circles (theoretical and real orbits), and the first and last also lines between points; all these object are QwtPlotCurves I attach to a QwtPlot object. However, using Qt 4.4.0, I only get red lines between points. All other objects are no longer shown. In the on screen version, everything looks OK, and also if I print the QwtPlot into a QImage. It is just the printing to a QPrinter in Qt 4.4.0 which seems to suppress some QwtPlotCurve objects. The obvious difference is that bitmaps work, vector graphics don't. Christian

Re: QwtPlot->print on QPrinter

Uwe Rathmann — 2008-07-01T19:19:45

Those are different but to me the 4.3.2 one looks more like something intended. What exactly is wrong with them - maybe upload the printed image to compare. Uwe ------------------------------------------------------------------------- Sponsored by: SourceForge.net Community Choice Awards: VOTE NOW! Studies have shown that voting for your favorite open source project, along with a healthy diet, reduces your potential for chronic lameness and boredom. Vote Now at http://www.sourceforge.net/community/cca08

QwtPlot->print on QPrinter

Christian Lackas — 2008-07-01T14:51:59

Hi Everybody, I have a problem when trying to print a QwtPlot onto a QPrinter to get a nice PDF. It works if I use an QImage as paint device and then print that, though. My code looks like this: QPrinter printer; printer.setOrientation(QPrinter::Portrait); printer.setOutputFormat(QPrinter::PdfFormat); printer.setOutputFileName(filename); printer.setPageSize(QPrinter::A4); QPainter painter(&printer); QRect page = printer.pageRect(); int w = page.width()-page.x(); QRect rect(page.x(), page.y(), w, w/60*80); for (int i=0; iprint(&painter, rect); if (i+1

Re: make legend background transparent

Uwe Rathmann — 2008-06-24T05:29:56

QwtLegend contains a QScrollArea. It's viewport contains a widget (QwtLegend::contentsWidget()) with the QwtLegendItems. Play around with the palette of these widgets to see what is goind wrong in your environment. Uwe ------------------------------------------------------------------------- Check out the new SourceForge.net Marketplace. It's the best place to buy or sell services for just about anything Open Source. http://sourceforge.net/services/buy/index.php

RE: Spectrogram help

David Stranz — 2008-06-24T01:14:04

Sebastiaan, Your questions aren't stupid - anyone who has faced the problem of plotting a 2-D data array using a spectrogram has had to deal with them. In the example, it's a nice continuous mathematical function with an infinite resolution raster. A z-value can be computed for every point using the equation. If you have discrete raster data (and you do - you don't have a continuous mathematical function, you have an array of discrete Z values on an X-Y grid), you have to do more work than the spectrogram example. Matthias Pospiech posted a solution (with source code) a week or so ago - look in the list archives on SourceForge. Basically, you have to create a function that maps from your real data space onto the pixel space of the screen. Your data has 401 x 501 points. What happens if you want to show this in a QwtPlot that is 600 x 750 pixels? The pixels don't line up with the matrix points. All those gaps have to be filled with some z value that is interpolated between your actual data point