Re: [Matplotlib-users] Colorbar embedding in qt4
Hi, thanks for having a look at this.
Problem is that a scatter plot doesn't seem to have the option to actually
update the data, or at least I couldn't find it.
Is there maybe a way?
On Thu, Jan 7, 2010 at 2:58 AM, Laurent Dufrechou
laurent.dufrec...@gmail.com wrote:
Hi alexander,
I tryed yesterday to play a little with your script.
I suspect that in fact each time you draw a figure, it is added to a pool
of figure to be rendered.
Thus it goes slower and slower.
What I do in my scritpt is either update the datas or if the drawing is a
completely new one (like a polar ionstaed of log previously) I delete the
figure.
To update data use:
1/self._plot, = axe.plot(x, y, 'b', animated=self._animated)
Later:
Loop:
2/self._plot.set_ydata(self._value)
If you need to delete your figure (that is not your case, but who knows for
the future):
axe = fig.add_axes(self.getPosition())
…
self._fig.delaxes(self._axe)
To go even faster(x10) you have the blitting method, but set_ydata should
be sufficent.
Laurent
*De :* Alexander Hupfer [mailto:son...@gmail.com]
*Envoyé :* jeudi 7 janvier 2010 03:36
*C**c :* matplotlib-users@lists.sourceforge.net
*Objet :* Re: [Matplotlib-users] Colorbar embedding in qt4
I isolated the problem a bit more. For some reason drawing gets slower and
slower with each plot drawn.
from os import sys
from time import time
from PyQt4 import QtGui, QtCore
import matplotlib
matplotlib.use('QT4Agg')
from matplotlib.backends.backend_qt4agg import FigureCanvasQTAgg as
FigureCanvas
from matplotlib.figure import Figure
class MyMplCanvas(FigureCanvas):
Ultimately, this is a QWidget (as well as a FigureCanvasAgg,
etc.).
def __init__(self, parent=None, width=5, height=4, dpi=100):
fig = Figure(figsize=(width, height), dpi=dpi)
self.axes = fig.add_subplot(111)
# We want the axes cleared every time plot() is called
self.axes.hold(False)
self.compute_initial_figure()
#
FigureCanvas.__init__(self, fig)
self.setParent(parent)
FigureCanvas.setSizePolicy(self,
QtGui.QSizePolicy.Expanding,
QtGui.QSizePolicy.Expanding)
FigureCanvas.updateGeometry(self)
def compute_initial_figure(self):
pass
class MyDynamicMplCanvas(MyMplCanvas):
A canvas that updates itself every second with a new plot.
def __init__(self, *args, **kwargs):
MyMplCanvas.__init__(self, *args, **kwargs)
timer = QtCore.QTimer(self)
QtCore.QObject.connect(timer, QtCore.SIGNAL(timeout()),
self.update_figure)
timer.start(0)
self.firstrun = True
self.colorbar = None
self.time = time()
self.p = None
def compute_initial_figure(self):
pass
def update_figure(self):
self.p = self.axes.scatter([1,2,3],[4,5,6], c = range(3),
animated=True)
self.axes.set_xlabel('psi')
self.axes.set_ylabel('delta')
if self.firstrun == True:
self.colorbar = self.axes.figure.colorbar(self.p)
self.firstrun = False
self.colorbar.set_clim(vmin=0,vmax=2)
self.colorbar.draw_all()
self.colorbar.set_label('time [abtr. ]')
self.draw()
newtime = time()
print newtime - self.time
self.time = newtime
class ApplicationWindow(QtGui.QMainWindow):
def __init__(self):
QtGui.QMainWindow.__init__(self)
self.setAttribute(QtCore.Qt.WA_DeleteOnClose)
self.main_widget = QtGui.QWidget(self)
l = QtGui.QVBoxLayout(self.main_widget)
dc = MyDynamicMplCanvas(self.main_widget, width=5, height=4,
dpi=100)
l.addWidget(dc)
self.main_widget.setFocus()
self.setCentralWidget(self.main_widget)
qApp = QtGui.QApplication(sys.argv)
aw = ApplicationWindow()
aw.setWindowTitle(%s % Slow!)
aw.setGeometry(100,100,800,600)
aw.show()
sys.exit(qApp.exec_())
On Mon, Jan 4, 2010 at 3:36 PM, Alexander Hupfer son...@gmail.com wrote:
Ok, here is the code as a whole. I think it's still short enough to
ilustrate the problem. Just start it with the datafile elips as an
argument
http://dl.dropbox.com/u/226980/elipsometry.tar.gz
The timer shows how long each render cycle takes. The time seems to grow
with number of cycles rendered even when no more points are added (the
points are calculated with a continous rate in a background thread and are
about 300 total).
On Sun, Jan 3, 2010 at 8:16 PM, John Hunter jdh2...@gmail.com wrote:
On Sun, Jan 3, 2010 at 7:02 PM, Alexander Hupfer son...@gmail.com wrote:
Thanks I got it fixed.
This leads to the follow up question:
What is the right way to keep an application responsive while the graph
is
drawn?
Drawing a scatter plot with 300 points seems to take a while. I guess I
need
Re: [Matplotlib-users] Colorbar embedding in qt4
Ok, here is the code as a whole. I think it's still short enough to ilustrate the problem. Just start it with the datafile elips as an argument http://dl.dropbox.com/u/226980/elipsometry.tar.gz The timer shows how long each render cycle takes. The time seems to grow with number of cycles rendered even when no more points are added (the points are calculated with a continous rate in a background thread and are about 300 total). On Sun, Jan 3, 2010 at 8:16 PM, John Hunter jdh2...@gmail.com wrote: On Sun, Jan 3, 2010 at 7:02 PM, Alexander Hupfer son...@gmail.com wrote: Thanks I got it fixed. This leads to the follow up question: What is the right way to keep an application responsive while the graph is drawn? Drawing a scatter plot with 300 points seems to take a while. I guess I need to launch the drawing in another thread but don't know exactly how to do this and only find examples of doing calculations in the background and not actual widget interaction. You posted some real code and a traceback, which helped move the ball forward. What we really need to see to help you though is a complete, free-standing example, that we can run on our machines, which exposes the problem. JDH -- This SF.Net email is sponsored by the Verizon Developer Community Take advantage of Verizon's best-in-class app development support A streamlined, 14 day to market process makes app distribution fast and easy Join now and get one step closer to millions of Verizon customers http://p.sf.net/sfu/verizon-dev2dev ___ Matplotlib-users mailing list Matplotlib-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/matplotlib-users
[Matplotlib-users] Colorbar embedding in qt4
Hi, I have a scatter plot embedded in qt4 according to http://matplotlib.sourceforge.net/examples/user_interfaces/embedding_in_qt4.htmlwhat works fine However if I try to add a colorbar to it by simply calling p = scatter() colorbar(p) I get an error that says that something is outside the drawable area. - sonium -- This SF.Net email is sponsored by the Verizon Developer Community Take advantage of Verizon's best-in-class app development support A streamlined, 14 day to market process makes app distribution fast and easy Join now and get one step closer to millions of Verizon customers http://p.sf.net/sfu/verizon-dev2dev ___ Matplotlib-users mailing list Matplotlib-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/matplotlib-users
Re: [Matplotlib-users] Colorbar embedding in qt4
Thanks I got it fixed. This leads to the follow up question: What is the right way to keep an application responsive while the graph is drawn? Drawing a scatter plot with 300 points seems to take a while. I guess I need to launch the drawing in another thread but don't know exactly how to do this and only find examples of doing calculations in the background and not actual widget interaction. - Alex On Sun, Jan 3, 2010 at 3:37 PM, Darren Dale dsdal...@gmail.com wrote: On Sun, Jan 3, 2010 at 5:26 PM, Alexander Hupfer son...@gmail.com wrote: Ok, that at least fixed the tkinter error, but I still don't get a colorbar attached to my plot. (which worked fine when I didn't embedd it in a Qt application) If you are importing from pylab or pyplot in your program, don't. These modules are not compatible with embedding. Darren -- This SF.Net email is sponsored by the Verizon Developer Community Take advantage of Verizon's best-in-class app development support A streamlined, 14 day to market process makes app distribution fast and easy Join now and get one step closer to millions of Verizon customers http://p.sf.net/sfu/verizon-dev2dev ___ Matplotlib-users mailing list Matplotlib-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/matplotlib-users
[Matplotlib-users] update plot in regular intervals while catching mouse/keyb events
Hi, I want to capture mouse and keyboard events on a plot while updating it in regular intervals. I succeeded doing both tasks independently however not in combination. For the updating I use a subthread to analyze the data while the main thread redraws the plot in a loop. However while redrawing it doesn't capture any other events. When I put a simple sleep in the redrawing thread it shows the same behavior. Is there a way to fix this? -- This SF.Net email is sponsored by the Verizon Developer Community Take advantage of Verizon's best-in-class app development support A streamlined, 14 day to market process makes app distribution fast and easy Join now and get one step closer to millions of Verizon customers http://p.sf.net/sfu/verizon-dev2dev ___ Matplotlib-users mailing list Matplotlib-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/matplotlib-users
