changing intervals

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win32/MSVC Qwt Polar installation

We are trying to install qwtpolar per the documentation on some Win7 development machines and have run into
a few problems.  I've read the qwtpolar INSTALL as well its pointer to
http://doc.qt.nokia.com/4.7/qmake-advanced-usage.html#adding-new-configuration-features
(and several older forum posts).

But unless I've missed something, I think there are a few small changes to qwtpolar 1.0.0 that are necessary
for it to build/install out of the box using Windows/MSVC.  We're using Qt 4.7.3, qwt 6.0.1, MSVC 9.0 (VS
2008).  We installed qwt 6.0.1 (nmake, nmake install).  I've edited qwtpolarconfig.pri to just build the
core library (no plugins or examples).  I didn't see much else to change in any of the qwtpolar .pro/pri files.

After some effort, I got qmake to find qwt.prf, but building still fails (either from the command line or
within qtcreator):

C:\qwtpolar-1.0.0>nmake
<snip>
qwt_polar_item.cpp
.\qwt_polar_item.cpp(346) : error C2027: use of undefined type 'QwtScaleDiv'
        c:\qwtpolar-1.0.0\src\qwt_polar_item.h(23) : see declaration of 'QwtScaleDiv'
<snip>
qwt_polar_curve.cpp
.\qwt_polar_curve.cpp(11) : fatal error C1083: Cannot open include file: 'qwt_polar.h': No such file or directory
<snip>
qwt_polar_layout.cpp
.\qwt_polar_layout.cpp(352) : warning C4146: unary minus operator applied to unsigned type, result
still unsigned
.\qwt_polar_layout.cpp(352) : warning C4146: unary minus operator applied to unsigned type, result
still unsigned

I'm not sure if the last warning is a concern or not, but can be fixed by being more verbose: -1.0*d_data->margin.

The first (QwtScaleDiv undefined) I believe is MSVC being more finicky about when forward declarations
are sufficient.  If I add a #include <qwt_scale_div.h> to qwt_polar_item.cpp, that error goes away.

A little more perplexing is the second issue:  it appears to have something to do with the fact that MSVC
creates separate debug/release subdirs and the compilers working dir.  If I change the offending
#include in qwt_polar_curve.cpp to <../qwt_polar.h>, everything builds successfully (subject to fix
above).  What bothers me is I have no idea why that particular header and that particular source file is the
only one that is a problem!  And clearly my "fix" for this isn't right--I'm not sure what the right
cross-platform tweak is the correct one.

I hope this is helpful.  Uwe, I didn't bother with an official diff/patch submission since the changes are so
simple, assuming you think the changes are acceptable for 1.0.x inclusion.  Thanks,

Ed

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Problems with performance - Qwt - Xorg with 4 or 6 screens

Hi to all.

In our organization, Elettra - Synchrotron Radiation Facility, Trieste,
Italy, we have used Qwt since many years now...

After introducing four and six screen computers, working with large
control panel applications with plots displaying data at a refresh rate
of 10Hz has become painful... Two or three of such applications can hang
the whole machine. This is not an issue if the same scenario takes place
in a "traditional" computer with one or at most two screens.

Xorg process is the one that takes 100% of the CPU usage in 4/6 monitor
machines, things getting even worse when the application window (i.e.
the plot inside it) grows in size.

Reading the past messages in the mailing list, there seems to be no way
of using the hardware acceleration to draw Qwt plots.
Nonetheless, we need to find a way to speed up the Xorg drawing process
in order to make our workstations usable even in the case of computers
connected to four or six screens.

In conclusion: is there any hint to optimize Xorg or Qwt paint process
in order to make our applications run smoothly?

In machines with 4 and 6 screens Xorg is slow and takes 100% of CPU also
when other applications require fast repaint of an area, such as a web
page being scrolled...

Thanks for any help 

---
Hardware configuration:

Intel(R) Core(TM)2 Quad CPU Q9550 @ 2.83GHz

4GB RAM

nVidia NVS 450
4 * 20" displays 1600x1200 (DVI-I)
2 * Full HD TVs @ 1920x1080 (DVI-I/HDMI)

Ubuntu 10.04 + KDE 3.5.12 + Qt 4.6.2 + qwt 5.2.0

Thanks, Giacomo.

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QwtPlotMagnifier: Scaling canvas by click-and-drag on the axis

Hello,

My app should have yLeft and yRight axes. For plot navigation simplification I would like to make have
QwtPlotMagnifiers for yLeft and yRight axes only. And I would like to activate them by click and drag on the
appropriate QwtScaleWidget. What is the best way to do it?

I tried the following and failed:

   QwtScaleWidget *yLeftMagnifier=new QwtPlotMagnifier(canvas());
   canvas()->removeEventFilter(yLeftMagnifier);   
   axisWidget(yLeft)->installEventFilter(yLeftMagnifier);

But this don't work as I expected because there's condition in qwt_magnifier.cpp:
bool QwtMagnifier::eventFilter( QObject *object, QEvent *event )
{
    if ( object && object == parent() )
      { ... processing event  } 
}

So event filter is only processed if object == parent(). What's the reason of limiting event filter to
process only parent's events? Probably this be removed in future versions of qwt.

Other question: How to make scaling xBottom and xTop axes with click and drag mouse in _horizontal_
direction? Should I subclass QwtMagnifier and QwtPlotMagnifier to achieve this?

--
with best regards,
Sergey P.

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mouse release event in example:event_filter

Hi,

   I am trying to write a App similar to event_filter example in Qwt5,
but with PyQwt5. I followed the cavanspicker class. However my
"select" and "move" works well, but the selected point did not get a
changes to be released. I defined the  add an extra handle in
eventFilter for "MouseRelease", to clear selected curve and point
index. In this way it works but the key board control does not work
any more, because the "select" with mouse now has reset the curve and
point index in MouseRelease before I move to control with keyboard.

  My question is. In the C++ version, where is the trick to "release"
the selected moving point ?

Thanks.

Best regards,
Forest.

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Aw: qwt 6.0.2 on osx

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qwt 6.0.2 on osx

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Implement selection of multiple points on QwtPlotCurve

Hello readers!

For my qwt-based application I need to implement selection of points. I
would like to implement most common used way of selection.
1) single LMB (Left mouse button) click drops selection of all
previously selected points and selects nearest point (like in
event_filter example

2) Ctrl+LMB click adds nearest point of the currently selected curve to
the selection or removes selection of point was selected previously. If
no points were selected previously then it should act as LMB without
Ctrl

3) Shift+LMB click selects interval of points on the current selected
curve. If no current curve selected then act in 1)

Can anyone suggest best way to do it?
Now I think that I should implement my QwtPickerMachine subclass and
make signal-slot communications inside QwtPlot subclass that will
handle selections. Probably there's easier ways, I don't know.

--

-- 
Sergey Popov
B. Verkin Institute for Low Temperature Physics and Engineering
Kharkov, Ukraine

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Issues with QtHelp and Debug Builds - Under Windows [SEC=UNCLASSIFIED]

UNCLASSIFIED

Hi All,

This is not a Qwt issue, but can effect anyone who uses the QtHelp
system with their application and also compile in debug. It seeks that
Nokia have released Qt 4.8.0 (specifically
qt-win-opensource-4.8.0-mingw.exe) where the QtHelpd4.dll (the debug
build) is dependent on QtCore4.dll, QtCLucene4.dll and QtGui4.dll (the
release versions). As most of you know, you can mix the debug and
release builds of Qt and have your application work properly or run at
all.

So if your are using Qt 4.8.0 and can't figure out why your application
won't run in debug mode, check to see if your application is using the
Qt Help System.

Note: I have not checked to see if this issue also occurs in the Visual
Studio versions or the Linux versions. I have however check all the
other Qt debug DLLs and they are all okay.

Regards,

Shane Hill

Shane D. Hill (B.E. Aero. Hons.)
Science Team Leader: Aircraft Flight Dynamics, Modelling & Simulation
Aircraft Vehicles Division Defence Science & Technology Organisation
506 Lorimer St, Fishermans Bend, Vic. 3207 AUSTRALIA
Shane.Hill <at> dsto.defence.gov.au
http://maps.google.com/maps?q=-37.822904,144.911385+(DSTO+Melbourne)

IMPORTANT: This email remains the property of the Department of Defence
and is subject to the jurisdiction of section 70 of the Crimes Act 1914.
If you have received this email in error, you are requested to contact
the sender and delete the email.

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Correct use of QwtSeriesData and QwtPlotCurve::setData

Hello!

I took a second try to use Qwt library for building scientific plot
application with Qt. My app gets data from network, stores it in 
QVector<QVector<double> > ARRAY, and it should display it on the
plot.

I implemented class SeriesData : public QwtSeriesData<QPointF> which
has pointer to the ARRAY, and implemented size(), sample() and
boundingRect() functions. And I faced few issues:

1) I had to return ARRAY->at(0).size()-1;
instead of
return ARRAY->at(0).size();

Otherwise it caused segfault. That was strange.

2) But the second strange thing is that my app now segfaults on exit.
....
class Plot : public QwtPlot
....
class SeriesData : public QwtSeriesData<QPointF>
...

code from mainwindow.cpp:
    plot=new Plot(this);
    plotCurve=new QwtPlotCurve("1");
    series=new SeriesData(data->getDataTable(),1,3);
//If following line is commented than app closes normally.
//If it's not commented then I get "Segmentation fault" message
//    plotCurve->setData(series);
 plotCurve->attach(plot);

Valgrind shows me some errors when plotCurve->setData(series) is not
commented out:
==3536== Invalid read of size 8
==3536==    at 0x4EC204F:
QwtPlotSeriesItem<QPointF>::~QwtPlotSeriesItem()
(in /usr/lib/libqwt.so.6) ==3536==    by 0x4EBF52C:
QwtPlotCurve::~QwtPlotCurve() (in /usr/lib/libqwt.so.6) ==3536==    by
0x4099F3: MainWindow::~MainWindow() (mainwindow.cpp:53) ==3536==    by
0x408919: main (main.cpp:10) ==3536==  Address 0x152fe7e0 is 0 bytes
inside a block of size 56 free'd ==3536==    at 0x4C26DCF: operator
delete(void*) (vg_replace_malloc.c:387) ==3536==    by 0x412F95:
SeriesData::~SeriesData() (seriesdata.h:7) ==3536==    by 0x4099C7:
MainWindow::~MainWindow() (mainwindow.cpp:52) ==3536==    by 0x408919:
main (main.cpp:10) ==3536== ==3536== Invalid write of size 8
==3536==    at 0x412F06: QwtSeriesData<QPointF>::~QwtSeriesData()
(qwt_series_data.h:171) ==3536==    by 0x4EC2054:
QwtPlotSeriesItem<QPointF>::~QwtPlotSeriesItem()
(in /usr/lib/libqwt.so.6) ==3536==    by 0x4EBF52C:
QwtPlotCurve::~QwtPlotCurve() (in /usr/lib/libqwt.so.6) ==3536==    by
0x4099F3: MainWindow::~MainWindow() (mainwindow.cpp:53) ==3536==    by
0x408919: main (main.cpp:10) ==3536==  Address 0x152fe7e0 is 0 bytes
inside a block of size 56 free'd ==3536==    at 0x4C26DCF: operator
delete(void*) (vg_replace_malloc.c:387) ==3536==    by 0x412F95:
SeriesData::~SeriesData() (seriesdata.h:7) ==3536==    by 0x4099C7:
MainWindow::~MainWindow() (mainwindow.cpp:52) ==3536==    by 0x408919:
main (main.cpp:10) ==3536== ==3536== Invalid free() / delete / delete[]
==3536==    at 0x4C26DCF: operator delete(void*)
(vg_replace_malloc.c:387) ==3536==    by 0x412F21:
QwtSeriesData<QPointF>::~QwtSeriesData() (qwt_series_data.h:170)
==3536==    by 0x4EC2054:
QwtPlotSeriesItem<QPointF>::~QwtPlotSeriesItem()
(in /usr/lib/libqwt.so.6) ==3536==    by 0x4EBF52C:
QwtPlotCurve::~QwtPlotCurve() (in /usr/lib/libqwt.so.6) ==3536==    by
0x4099F3: MainWindow::~MainWindow() (mainwindow.cpp:53) ==3536==    by
0x408919: main (main.cpp:10) ==3536==  Address 0x152fe7e0 is 0 bytes
inside a block of size 56 free'd ==3536==    at 0x4C26DCF: operator
delete(void*) (vg_replace_malloc.c:387) ==3536==    by 0x412F95:
SeriesData::~SeriesData() (seriesdata.h:7) ==3536==    by 0x4099C7:
MainWindow::~MainWindow() (mainwindow.cpp:52) ==3536==    by 0x408919:
main (main.cpp:10)

Suggestions? What do I do wrong? Where can I see correct example of
using Qwt library and subclassing it's members?

--

-- 
Sergey Popov
B. Verkin Institute for Low Temperature Physics and Engineering
Kharkov, Ukraine

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qwt debug version not working with Qt-4.8.0

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