Is matplotlib compatible whith PyQt4 ?

Thank you very much.

What I would like is example for embedding_in_qt.py but whith qt4

when I tried :

import PyQt4
from PyQt4.QtCore import *
from PyQt4.QtGui import *

from matplotlib.backends.backend_qtagg import FigureCanvasQTAgg as
FigureCanvas
from matplotlib.figure import Figure

but I have :

Traceback (most recent call last):
  File "embedding_in_qt.py", line 26, in ?
    from matplotlib.backends.backend_qtagg import FigureCanvasQTAgg as
FigureCanvas
  File
"/usr/lib/python2.4/site-packages/matplotlib/backends/backend_qtagg.py",
line 12, in ?
    from backend_qt import qt, FigureManagerQT, FigureCanvasQT,\
  File
"/usr/lib/python2.4/site-packages/matplotlib/backends/backend_qt.py",
line 18, in ?
    import qt
RuntimeError: the qt and PyQt4.QtCore modules both wrap the QObject class

I have a debian sid machine and the package python-matplotlib depends on
python-qt3. But the package python-qt4 exists.
Any ideas what to do ?

Samuel

You should be doing this instead:

from matplotlib.backends.backend_qt4agg import FigureCanvasQTAgg as FigureCanvas

Darren

···

On Tuesday 15 August 2006 16:05, sgarcia@...839... wrote:

Thank you very much.

What I would like is example for embedding_in_qt.py but whith qt4

when I tried :

import PyQt4
from PyQt4.QtCore import *
from PyQt4.QtGui import *

from matplotlib.backends.backend_qtagg import FigureCanvasQTAgg as
FigureCanvas
from matplotlib.figure import Figure

but I have :

Traceback (most recent call last):

Thank you,

Sorry I did known the existence of matplotlib.backends.backend_qt4agg.
It is more easy than I thought.

but I still have a problem. This is my code :

import sys

from PyQt4.QtCore import *

from PyQt4.QtGui import *

from matplotlib.backends.backend_qt4agg import FigureCanvasQTAgg as
FigureCanvas

from matplotlib.figure import Figure

···

sgarcia@…839…http://sel.as-us.falkag.net/sel?cmd=lnk&kid=120709&bid=263057&dat=121642Matplotlib-users@lists.sourceforge.nethttps://lists.sourceforge.net/lists/listinfo/matplotlib-users

You may not be doing anything wrong. The qt4 backend is new and hasn't seen
much use. I think you are the first to try to embed in your own qt4
application. If you feel up to it, maybe you could try to track down the
problem.

Darren

···

On Wednesday 16 August 2006 04:54, Samuel GARCIA wrote:

I still have a problem. This is my code :

import sys

from PyQt4.QtCore import *
from PyQt4.QtGui import *

from matplotlib.backends.backend_qt4agg import FigureCanvasQTAgg as
FigureCanvas
from matplotlib.figure import Figure

#--------------------------------------------------------------------------
---- class MyWidget(QWidget):
    def __init__(self, parent=None):
        QWidget.__init__(self, parent)
        self.menuBar = QMenuBar()
        self.fileMenu = QMenu(self.tr("&File"), self)
        self.menuBar.addMenu(self.fileMenu)

        mainLayout = QVBoxLayout()
        mainLayout.setMenuBar(self.menuBar)

        self.setLayout(mainLayout)

#--------------------------------------------------------------------------
---- if __name__ == "__main__":
    app = QApplication(sys.argv)
    dialog = MyWidget()
    dialog.show()
    sys.exit(app.exec_())

and it does not works because the main window is blocking.
But when I comment this line :
#from matplotlib.backends.backend_qt4agg import FigureCanvasQTAgg as
FigureCanvas
it works !
What am I doing wrong ?

I am not good enougth track and solve the problem.

Maybe I can be a beta tester.

I saw in svn that the author of qt4 backend is Charlie Moad.

And it is very young (6 weeks).

So a question for Charlie moad : do you have a example which could work
on my debian unstable station for embedding_in_qt4.py ?

thank you

Samuel

Darren Dale wrote:

···
On Wednesday 16 August 2006 04:54, Samuel GARCIA wrote:

I still have a problem. This is my code :
import sys
from PyQt4.QtCore import *
from PyQt4.QtGui import *
from matplotlib.backends.backend_qt4agg import FigureCanvasQTAgg as
FigureCanvas
from matplotlib.figure import Figure
#--------------------------------------------------------------------------
---- class MyWidget(QWidget):
def __init__(self, parent=None):
QWidget.__init__(self, parent)
self.menuBar = QMenuBar()
self.fileMenu = QMenu(self.tr("&File"), self)
self.menuBar.addMenu(self.fileMenu)
mainLayout = QVBoxLayout()
mainLayout.setMenuBar(self.menuBar)
self.setLayout(mainLayout)
#--------------------------------------------------------------------------
---- if __name__ == "__main__":
app = QApplication(sys.argv)
dialog = MyWidget()
dialog.show()
sys.exit(app.exec_())
and it does not works because the main window is blocking.
But when I comment this line :
#from matplotlib.backends.backend_qt4agg import FigureCanvasQTAgg as
FigureCanvas
it works !
What am I doing wrong ?

You may not be doing anything wrong. The qt4 backend is new and hasn't seen much use. I think you are the first to try to embed in your own qt4 application. If you feel up to it, maybe you could try to track down the problem.
Darren

I am not the author of it. I just may of made the last commits to it.
I am pretty sure Darren wrote the initial implimentatin. The only
example that exists right now is animation_blit_qt4.py.

···

On 8/16/06, Samuel GARCIA <sgarcia@...839...> wrote:

I am not good enougth track and solve the problem.
Maybe I can be a beta tester.

I saw in svn that the author of qt4 backend is Charlie Moad.
And it is very young (6 weeks).

So a question for Charlie moad : do you have a example which could work on
my debian unstable station for embedding_in_qt4.py ?

thank you

Samuel

Darren Dale wrote:
On Wednesday 16 August 2006 04:54, Samuel GARCIA wrote:

I still have a problem. This is my code :

import sys

from PyQt4.QtCore import *
from PyQt4.QtGui import *

from matplotlib.backends.backend_qt4agg import
FigureCanvasQTAgg as
FigureCanvas
from matplotlib.figure import Figure

#--------------------------------------------------------------------------
---- class MyWidget(QWidget):
def __init__(self, parent=None):
QWidget.__init__(self, parent)
self.menuBar = QMenuBar()
self.fileMenu = QMenu(self.tr("&File"), self)
self.menuBar.addMenu(self.fileMenu)

mainLayout = QVBoxLayout()
mainLayout.setMenuBar(self.menuBar)

self.setLayout(mainLayout)

#--------------------------------------------------------------------------
---- if __name__ == "__main__":
app = QApplication(sys.argv)
dialog = MyWidget()
dialog.show()
sys.exit(app.exec_())

and it does not works because the main window is blocking.
But when I comment this line :
#from matplotlib.backends.backend_qt4agg import
FigureCanvasQTAgg as
FigureCanvas
it works !
What am I doing wrong ?

You may not be doing anything wrong. The qt4 backend is new and hasn't seen
much use. I think you are the first to try to embed in your own qt4
application. If you feel up to it, maybe you could try to track down the
problem.

Darren

-------------------------------------------------------------------------
Using Tomcat but need to do more? Need to support web services, security?
Get stuff done quickly with pre-integrated technology to make your job
easier
Download IBM WebSphere Application Server v.1.0.1 based on Apache Geronimo
http://sel.as-us.falkag.net/sel?cmd=lnk&kid=120709&bid=263057&dat=121642

_______________________________________________
Matplotlib-users mailing list
Matplotlib-users@lists.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/matplotlib-users

I think you misread the svn entry. James Amundson ported the qt3 backend to
qt4, but it was not quite finished. I finished the port and committed it.
Charlie added blitting.

···

On Wednesday 16 August 2006 08:49, Samuel GARCIA wrote:

I am not good enougth track and solve the problem.
Maybe I can be a beta tester.

I saw in svn that the author of qt4 backend is Charlie Moad.
And it is very young (6 weeks).

Sorry for the mistake.

Darren Dale wrote:

···
On Wednesday 16 August 2006 08:49, Samuel GARCIA wrote:

I am not good enougth track and solve the problem.
Maybe I can be a beta tester.
I saw in svn that the author of qt4 backend is Charlie Moad.
And it is very young (6 weeks).
I think you misread the svn entry. James Amundson ported the qt3 backend to qt4, but it was not quite finished. I finished the port and committed it. Charlie added blitting.

I'll try to have a look this weekend.

Darren

···

On Wednesday 16 August 2006 04:54, Samuel GARCIA wrote:

Thank you,
Sorry I did known the existence of matplotlib.backends.backend_qt4agg.
It is more easy than I thought.

but I still have a problem. This is my code :

import sys

from PyQt4.QtCore import *
from PyQt4.QtGui import *

from matplotlib.backends.backend_qt4agg import FigureCanvasQTAgg as
FigureCanvas
from matplotlib.figure import Figure

#--------------------------------------------------------------------------
---- class MyWidget(QWidget):
    def __init__(self, parent=None):
        QWidget.__init__(self, parent)
        self.menuBar = QMenuBar()
        self.fileMenu = QMenu(self.tr("&File"), self)
        self.menuBar.addMenu(self.fileMenu)

        mainLayout = QVBoxLayout()
        mainLayout.setMenuBar(self.menuBar)

        self.setLayout(mainLayout)

#--------------------------------------------------------------------------
---- if __name__ == "__main__":
    app = QApplication(sys.argv)
    dialog = MyWidget()
    dialog.show()
    sys.exit(app.exec_())

and it does not works because the main window is blocking.

There is a comment in the embedding_in_qt.py example:

# The QApplication has to be created before backend_qt is imported, otherwise
# it will create one itself.

This goes for qt4 as well, and is the source of the problem. You can have only
one QApplication at a time. (Ted, John, do you think the QApplication really
needs to be created during the module import? show() is the only function
that looks for the QApplication, maybe the qApp should be created there
instead. Any reason against?)

I added an example, embedding_in_qt4.py, to the svn repository. It is closely
based on embedding_in_qt.py.

Darren

···

On Friday 18 August 2006 08:27, Darren Dale wrote:

On Wednesday 16 August 2006 04:54, Samuel GARCIA wrote:
> Thank you,
> Sorry I did known the existence of matplotlib.backends.backend_qt4agg.
> It is more easy than I thought.
>
> but I still have a problem. This is my code :
>
> import sys
>
> from PyQt4.QtCore import *
> from PyQt4.QtGui import *
>
> from matplotlib.backends.backend_qt4agg import FigureCanvasQTAgg as
> FigureCanvas
> from matplotlib.figure import Figure
>
> #------------------------------------------------------------------------
>-- ---- class MyWidget(QWidget):
> def __init__(self, parent=None):
> QWidget.__init__(self, parent)
> self.menuBar = QMenuBar()
> self.fileMenu = QMenu(self.tr("&File"), self)
> self.menuBar.addMenu(self.fileMenu)
>
> mainLayout = QVBoxLayout()
> mainLayout.setMenuBar(self.menuBar)
>
> self.setLayout(mainLayout)
>
> #------------------------------------------------------------------------
>-- ---- if __name__ == "__main__":
> app = QApplication(sys.argv)
> dialog = MyWidget()
> dialog.show()
> sys.exit(app.exec_())
>
> and it does not works because the main window is blocking.

- Charlie

···

On 8/19/06, Darren Dale <dd55@...163...> wrote:

On Friday 18 August 2006 08:27, Darren Dale wrote:
> On Wednesday 16 August 2006 04:54, Samuel GARCIA wrote:
> > Thank you,
> > Sorry I did known the existence of matplotlib.backends.backend_qt4agg.
> > It is more easy than I thought.
> >
> > but I still have a problem. This is my code :
> >
> > import sys
> >
> > from PyQt4.QtCore import *
> > from PyQt4.QtGui import *
> >
> > from matplotlib.backends.backend_qt4agg import FigureCanvasQTAgg as
> > FigureCanvas
> > from matplotlib.figure import Figure
> >
> > #------------------------------------------------------------------------
> >-- ---- class MyWidget(QWidget):
> > def __init__(self, parent=None):
> > QWidget.__init__(self, parent)
> > self.menuBar = QMenuBar()
> > self.fileMenu = QMenu(self.tr("&File"), self)
> > self.menuBar.addMenu(self.fileMenu)
> >
> > mainLayout = QVBoxLayout()
> > mainLayout.setMenuBar(self.menuBar)
> >
> > self.setLayout(mainLayout)
> >
> > #------------------------------------------------------------------------
> >-- ---- if __name__ == "__main__":
> > app = QApplication(sys.argv)
> > dialog = MyWidget()
> > dialog.show()
> > sys.exit(app.exec_())
> >
> > and it does not works because the main window is blocking.

There is a comment in the embedding_in_qt.py example:

# The QApplication has to be created before backend_qt is imported, otherwise
# it will create one itself.

This goes for qt4 as well, and is the source of the problem. You can have only
one QApplication at a time. (Ted, John, do you think the QApplication really
needs to be created during the module import? show() is the only function
that looks for the QApplication, maybe the qApp should be created there
instead. Any reason against?)

I added an example, embedding_in_qt4.py, to the svn repository. It is closely
based on embedding_in_qt.py.

From what I saw, creating QApp in show makes more sense.

I changed the qt backends to create a QApplication in show() rather than at
the time of module import. I also updated the embedding_in_qt* examples.
Samuel, as of svn 2711, you are free to create your QApplication *after* you
import backend_qt(4).

Darren

P.S.- For anyone who is interested, I'd recommend "C++ GUI Programming with Qt
4" (available at Amazon). I'm not an experienced C++ programmer, but the book
has an excellent (and brief) introduction to C++ in the appendix, and is easy
enough to understand for anyone who wants to work with PyQt4.

···

On Saturday 19 August 2006 12:47, Charlie Moad wrote:

On 8/19/06, Darren Dale <dd55@...163...> wrote:
> On Friday 18 August 2006 08:27, Darren Dale wrote:
> > On Wednesday 16 August 2006 04:54, Samuel GARCIA wrote:
> > > Thank you,
> > > Sorry I did known the existence of
> > > matplotlib.backends.backend_qt4agg. It is more easy than I thought.
> > >
> > > but I still have a problem. This is my code :
> > >
> > > import sys
> > >
> > > from PyQt4.QtCore import *
> > > from PyQt4.QtGui import *
> > >
> > > from matplotlib.backends.backend_qt4agg import FigureCanvasQTAgg as
> > > FigureCanvas
> > > from matplotlib.figure import Figure
> > >
> > > #--------------------------------------------------------------------
> > >---- -- ---- class MyWidget(QWidget):
> > > def __init__(self, parent=None):
> > > QWidget.__init__(self, parent)
> > > self.menuBar = QMenuBar()
> > > self.fileMenu = QMenu(self.tr("&File"), self)
> > > self.menuBar.addMenu(self.fileMenu)
> > >
> > > mainLayout = QVBoxLayout()
> > > mainLayout.setMenuBar(self.menuBar)
> > >
> > > self.setLayout(mainLayout)
> > >
> > > #--------------------------------------------------------------------
> > >---- -- ---- if __name__ == "__main__":
> > > app = QApplication(sys.argv)
> > > dialog = MyWidget()
> > > dialog.show()
> > > sys.exit(app.exec_())
> > >
> > > and it does not works because the main window is blocking.
>
> There is a comment in the embedding_in_qt.py example:
>
> # The QApplication has to be created before backend_qt is imported,
> otherwise # it will create one itself.
>
> This goes for qt4 as well, and is the source of the problem. You can have
> only one QApplication at a time. (Ted, John, do you think the
> QApplication really needs to be created during the module import? show()
> is the only function that looks for the QApplication, maybe the qApp
> should be created there instead. Any reason against?)
>
> I added an example, embedding_in_qt4.py, to the svn repository. It is
> closely based on embedding_in_qt.py.

From what I saw, creating QApp in show makes more sense.

Darren Dale wrote:


Thank you,
Sorry I did known the existence of
matplotlib.backends.backend_qt4agg. It is more easy than I thought.
but I still have a problem. This is my code :
import sys
from PyQt4.QtCore import *
from PyQt4.QtGui import *
from matplotlib.backends.backend_qt4agg import FigureCanvasQTAgg as
FigureCanvas
from matplotlib.figure import Figure
#--------------------------------------------------------------------
---- -- ---- class MyWidget(QWidget):
def __init__(self, parent=None):
QWidget.__init__(self, parent)
self.menuBar = QMenuBar()
self.fileMenu = QMenu(self.tr("&File"), self)
self.menuBar.addMenu(self.fileMenu)
mainLayout = QVBoxLayout()
mainLayout.setMenuBar(self.menuBar)
self.setLayout(mainLayout)
#--------------------------------------------------------------------
---- -- ---- if __name__ == "__main__":
app = QApplication(sys.argv)
dialog = MyWidget()
dialog.show()
sys.exit(app.exec_())
and it does not works because the main window is blocking.

There is a comment in the embedding_in_qt.py example:
# The QApplication has to be created before backend_qt is imported,
otherwise # it will create one itself.
This goes for qt4 as well, and is the source of the problem. You can have
only one QApplication at a time. (Ted, John, do you think the
QApplication really needs to be created during the module import? show()
is the only function that looks for the QApplication, maybe the qApp
should be created there instead. Any reason against?)
I added an example, embedding_in_qt4.py, to the svn repository. It is
closely based on embedding_in_qt.py.
From what I saw, creating QApp in show makes more sense.

I changed the qt backends to create a QApplication in show() rather than at the time of module import. I also updated the embedding_in_qt* examples. Samuel, as of svn 2711, you are free to create your QApplication *after* you import backend_qt(4).
Darren
P.S.- For anyone who is interested, I'd recommend "C++ GUI Programming with Qt 4" (available at Amazon). I'm not an experienced C++ programmer, but the book has an excellent (and brief) introduction to C++ in the appendix, and is easy enough to understand for anyone who wants to work with PyQt4.than you

Thank you,

for the moment It is not a problem for me te create the QApplication
before.

I have just 1 week to finish my project. And I use the debian package.
So I don’t have time to install svn version for the moment.

I will try it in 2 or 3 weeks.

Programming wyth PyQt4 and matplotlib is really great. You can create
little but good loocking application in a very short time.

Thany you for every people involved in these projects.

Samuel

···

<dd55@…163…>