Re: [Matplotlib-users] Clear Figure
Hi Jae-Joon Lee,
I tried it but unfortunately it didn't work too. After the Figure is
cleared I cannot plot again.
I've attached the whole code that I'm trying to do this, I hope it could
help a little bit. I modified the original example just to test this
feature.
Thanks!
Bernardo M. Rocha
Jae-Joon Lee wrote:
I guess you need to put draw() after plot()
self.canvas.figure.clf()
self.canvas.axes.plot([1.,2.,4.])
self.canvas.draw()
Let us know if it does not help.
-JJ
On Sat, Oct 4, 2008 at 7:17 PM, rocha [EMAIL PROTECTED] wrote:
Hi Guys,
I need to clear the Figure after the user has clicked the some button in
PyQt, but when I try to plot the graphics again nothing appear. In
ipython it works, but when I try it inside my application it does not
work. What am I missing?
Inside my MplCanvas class (actually it is a QWidget - see
embedding_in_qt4.py in matplotlib examples file - user_interface) I have
this code:
self.fig = Figure(figsize=(self.width, self.height), dpi=dpi)
And then in my main application I'm trying to do:
self.canvas.figure.clf()
self.canvas.draw()
self.canvas.axes.plot([1.,2.,4.])
and nothing is plotted. The Figure is totally gray. I tried to do the
same thing in embedding_in_qt4.py example, modifying some parts, but it
didn't work too.
Do you have any suggestions?
Thanks!
Best regards,
Bernardo M. Rocha
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#!/usr/bin/env python
# embedding_in_qt4.py --- Simple Qt4 application embedding matplotlib canvases
#
# Copyright (C) 2005 Florent Rougon
# 2006 Darren Dale
#
# This file is an example program for matplotlib. It may be used and
# modified with no restriction; raw copies as well as modified versions
# may be distributed without limitation.
import sys, os, random
from PyQt4 import QtGui, QtCore
from numpy import arange, sin, pi
from matplotlib.backends.backend_qt4agg import FigureCanvasQTAgg as FigureCanvas
from matplotlib.figure import Figure
progname = os.path.basename(sys.argv[0])
progversion = 0.1
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 MyStaticMplCanvas(MyMplCanvas):
Simple canvas with a sine plot.
def compute_initial_figure(self):
t = arange(0.0, 3.0, 0.01)
s = sin(2*pi*t)
self.axes.plot(t, s)
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(1000)
def compute_initial_figure(self):
self.axes.plot([0, 1, 2, 3], [1, 2, 0, 4], 'r')
def update_figure(self):
# Build a list of 4 random integers between 0 and 10 (both inclusive)
l = [ random.randint(0, 10) for i in xrange(4) ]
self.axes.plot([0, 1, 2, 3], l, 'r')
self.draw()
def limpa(self):
self.figure.clf()
self.draw()
class ApplicationWindow(QtGui.QMainWindow):
def __init__(self):
QtGui.QMainWindow.__init__(self)
self.setAttribute(QtCore.Qt.WA_DeleteOnClose)
self.setWindowTitle(application main window)
self.file_menu = QtGui.QMenu('File', self)
self.file_menu.addAction('Quit', self.fileQuit,
QtCore.Qt.CTRL + QtCore.Qt.Key_Q)
self.menuBar().addMenu(self.file_menu)
self.help_menu = QtGui.QMenu('Help', self)
self.menuBar().addSeparator()
self.menuBar().addMenu(self.help_menu)
self.help_menu.addAction('About', self.teste)
self.main_widget = QtGui.QWidget(self)
l = QtGui.QVBoxLayout(self.main_widget)
sc =
Re: [Matplotlib-users] Problem in afm.py with 0.98.3
[EMAIL PROTECTED] (Berthold
Höllmann) writes:
(Pdb) print self._header
{'Notice': 'Copyright (c) 1999 Ministry of Education, Taipei, Taiwan. All
Rights Reserved.', 'Ascender': 880.0, 'FontBBox': [-123, -250, 1000, 880],
'Weight': 'Regular', 'Descender': -250.0, 'CharacterSet': 'Adobe-CNS1-0',
'IsFixedPitch': False, 'FontName': 'MOEKai-Regular', 'StartFontMetrics':
4.0996, 'CapHeight': 880.0, 'Version': '1.000',
'UnderlinePosition': -100, 'Characters': 13699, 'UnderlineThickness': 50,
'ItalicAngle': 0.0, 'StartCharMetrics': 13699}
That AFM file doesn't include a family name or a full name for the font
it describes. It seems that both are in fact optional attributes. I have
committed a change (on the trunk, and in the maintenance branch) that
should fix this, but since I don't have any AFM files like this, I can't
check that it works. Can you check out either the trunk or the
maintenance branch from Subversion, or apply the following patch and try
again?
--
Jouni K. Seppänen
http://www.iki.fi/jks
Index: lib/matplotlib/afm.py
===
--- lib/matplotlib/afm.py (revision 6149)
+++ lib/matplotlib/afm.py (revision 6150)
@@ -34,7 +34,7 @@
John D. Hunter [EMAIL PROTECTED]
-import sys, os
+import sys, os, re
from _mathtext_data import uni2type1
#Convert string the a python type
@@ -433,12 +433,22 @@
def get_fullname(self):
Return the font full name, eg, 'Times-Roman'
-return self._header['FullName']
+name = self._header.get('FullName')
+if name is None: # use FontName as a substitute
+name = self._header['FontName']
+return name
def get_familyname(self):
Return the font family name, eg, 'Times'
-return self._header['FamilyName']
+name = self._header.get('FamilyName')
+if name is not None:
+return name
+# FamilyName not specified so we'll make a guess
+name = self.get_fullname()
+extras = r'(?i)([ -](regular|plain|italic|oblique|bold|semibold|light|ultralight|extra|condensed))+$'
+return re.sub(extras, '', name)
+
def get_weight(self):
Return the font weight, eg, 'Bold' or 'Roman'
return self._header['Weight']
-
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[Matplotlib-users] Problems plotting/closing figures within a thread
I am writing a GUI application in wxPython and using MPL that plots figures,
saves them to image files, and then closes them all from within a thread to
keep the GUI responsive. Using the Enthought 2.3 install I would
sporatically have crashes that were hard to reproduce, but now that I've
upgrade to Enthought 2.5 (Python 2.5 and MPL 0.91.2.0001) it started
throwing exceptions when attempting to close a figure that I don't
understand. I've created an example script that excites the exception. I'm
not sure if the syptoms are a combination of problems caused by my use of
threads but this problem does not occur if threading is removed from the
script. I've read of others experiencing memory leaks and such when closing
figures, but no situations quite like this.
I am working from a desktop in Windows XP and I use the WXAgg backend.
Does anyone have any ideas, or any feedback on my use of threads? Thanks,
Josh
---
#!/usr/bin/python
import wx
import time
from threading import Thread
import matplotlib
matplotlib.interactive(False)
matplotlib.use('WXAgg')
import matplotlib.pylab
class TestThread(Thread):
def __init__(self, notify_window):
Thread.__init__(self)
def run(self):
while True: # Continuous loop that plots and destroys a figure
matplotlib.pylab.figure(1)
matplotlib.pylab.plot(range(0,5), range(0,5))
matplotlib.pylab.show()
time.sleep(1)
matplotlib.pylab.close(1) ### ERROR OCCURS HERE
class MainPanel(wx.Panel):
def __init__(self, *args, **kwargs):
wx.Panel.__init__(self, *args, **kwargs)
self.test_thread = None
# GUI objects and bindings
self.run_test_button = wx.Button(self, -1, Run)
self.top_sizer = wx.BoxSizer(wx.VERTICAL)
self.top_sizer.Add(self.run_test_button, 0, wx.EXPAND|wx.ALL,
border=2)
self.SetSizer(self.top_sizer)
self.Bind(wx.EVT_BUTTON, self.run_test_button_bind, id =
self.run_test_button.GetId())
### Binding Methods
def run_test_button_bind(self, event):
self.test_thread = TestThread(self)
self.test_thread.start()
#self.test_thread.run()
class MainFrame(wx.Frame):
def __init__(self, *args, **kwargs):
mFrame = wx.Frame.__init__(self, *args, **kwargs)
self.mPanel = MainPanel(self, -1)
class mainApp(wx.App):
def OnInit(self):
self.frame = MainFrame(None, title=Test, size=wx.Size(100, 100))
self.frame.Show()
self.SetTopWindow(self.frame)
return True
if __name__ == __main__:
app = mainApp()
app.MainLoop()
--
Exception in thread Thread-1:
Traceback (most recent call last):
File C:\Python25\lib\threading.py, line 486, in __bootstrap_inner
self.run()
File .\test.py, line 22, in run
matplotlib.pylab.close(1) ### ERROR OCCURS HERE
File
C:\python25\lib\site-packages\matplotlib-0.91.2.0001-py2.5-win32.egg\matplotlib\pyplot.py,
line 245, in close
_pylab_helpers.Gcf.destroy(arg)
File
C:\python25\lib\site-packages\matplotlib-0.91.2.0001-py2.5-win32.egg\matplotlib\_pylab_helpers.py,
line 28, in destroy
figManager.destroy()
File
C:\python25\lib\site-packages\matplotlib-0.91.2.0001-py2.5-win32.egg\matplotlib\backends\backend_wx.py,
line 1406, in destroy
self.frame.Destroy()
File
C:\python25\lib\site-packages\matplotlib-0.91.2.0001-py2.5-win32.egg\matplotlib\backends\backend_wx.py,
line 1365, in Destroy
wxapp.Yield()
File
C:\python25\lib\site-packages\wxpython-2.8.4.0.0003_s-py2.5-win32.egg\wx\_core.py,
line 7119, in Yield
return _core_.PyApp_Yield(*args, **kwargs)
PyAssertionError: C++ assertion wxThread::IsMain() failed at
..\..\src\msw\evtloop.cpp(244) in wxEventLoop::Dispatch(): only the main
thread can process Windows messages
--
View this message in context:
http://www.nabble.com/Problems-plotting-closing-figures-within-a-thread-tp19789227p19789227.html
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Re: [Matplotlib-users] Clear Figure
On Sun, Oct 5, 2008 at 3:50 AM, rocha [EMAIL PROTECTED] wrote: self.canvas.figure.clf() self.canvas.draw() self.canvas.axes.plot([1.,2.,4.]) and nothing is plotted. The Figure is totally gray. I tried to do the same thing in embedding_in_qt4.py example, modifying some parts, but it didn't work too. Do you have any suggestions? The problem appears to be that you have kept a copy of your old axes around (self.canvas.axes is not a mpl construct, so it looks like you have attached an axes instance to your canvas instance). You will want to either not clear your figure and clear your axes instead ax.cla() ax.plot([1,2,3]) canvas.draw() or clear your figure, create a new axes, plot and then draw fig.clf() ax = fig.add_subplot(111) ax.plot([1,2,3]) ax.draw() Be careful with the name axes to refer to a single axes instance attached to your canvas. In the mpl scheme, axes is a list of Axes instance and is attached to the Figure instance. See for example http://matplotlib.sourceforge.net/doc/html/users/artists.html JDH - This SF.Net email is sponsored by the Moblin Your Move Developer's challenge Build the coolest Linux based applications with Moblin SDK win great prizes Grand prize is a trip for two to an Open Source event anywhere in the world http://moblin-contest.org/redirect.php?banner_id=100url=/ ___ Matplotlib-users mailing list Matplotlib-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/matplotlib-users
[Matplotlib-users] Installation on Fedora2 etc.
Hi all, I'm trying to install the latest matplotlib on a couple of machines. They both run the same OS (an old custom version between Fedora 2 and 3) but the rest of the setup are rather different. For the curious, one is an MR scanner and the other is a developmental machine for compiling pulse-sequences etc. I have root permissions on both, but would rather not disturb the installed directory tree. What is the best/recommended way of going about it? 1. Is it possible to install matplotlib ( and its requirements ) in the developmental machine in a separate root directory, export it and mount from the other machine? The idea is to install once and use those from both. Would this work? What backends would work on this setup? 2. This is to be used for dynamically plotting the data coming out of the scanner. I'm also thinking of embedding it in an UI. Can all the UI backends handle the rate of about 10 FPS with each data ~5K short-ints? Thanks for your time, Venkat. - This SF.Net email is sponsored by the Moblin Your Move Developer's challenge Build the coolest Linux based applications with Moblin SDK win great prizes Grand prize is a trip for two to an Open Source event anywhere in the world http://moblin-contest.org/redirect.php?banner_id=100url=/ ___ Matplotlib-users mailing list Matplotlib-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/matplotlib-users
Re: [Matplotlib-users] vertical padding in legend
Done, except that it just raises a warning, and still works with the old kwarg. The new kwarg is borderpad; it is used if pad==0, which is the new rc default. I set the default borderpad=0.5. There is still too much other positioning in legend that is based on axes units. I briefly tried to start changing others, again with additional kwargs, and things quickly fell apart. Legend needs considerable reworking to take full advantage of the transforms framework (and maybe other mpl improvements since the original legend) and to put all positioning kwargs and code in sensible units. It is amazing that the present code works as well as it does. The way to make a transition may be via a separate version for a while. There could be a single interface, with a kwarg to choose the version. Thanks Eric. I would like to help reworking on the legend class. I once tried to incorporate the FancyBox into the legend but the result is not satisfactory because the legend bounding box is defined as axes units in the current implementation (see the attached screenshot). And I guess it would be better do things in the display coordinate. Also, in the current implementation, the vertical spacing between each legend varies according to the height of the legend text. For example, in the attached screenshot, the spacings between ac, ag, lg are all different and this is because their text heights are different. I think it is better if we have a fixed spacing, or have a minimum spacing as the text height of lg. And use the baseline-alignment if possible. Regards, -JJ attachment: t.png- This SF.Net email is sponsored by the Moblin Your Move Developer's challenge Build the coolest Linux based applications with Moblin SDK win great prizes Grand prize is a trip for two to an Open Source event anywhere in the world http://moblin-contest.org/redirect.php?banner_id=100url=/___ Matplotlib-users mailing list Matplotlib-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/matplotlib-users
Re: [Matplotlib-users] Problems plotting/closing figures within a thread
On dimanche 05 octobre 2008, jcarnes wrote: I am writing a GUI application in wxPython and using MPL that plots figures, saves them to image files, and then closes them all from within a thread to keep the GUI responsive. Normally only the main thread should alter the graphics - you'll have crashes if you try to do it otherwise. If you want to perform calculations in a separate thread to keep the GUI responsive, you have to send an event from the working thread to the main thread, so that the main thread does the GUI update. http://docs.wxwidgets.org/stable/wx_wxthreadoverview.html#wxthreadoverview Well, at least that's the story from my C++ wx knowledge, but it is probably still valid in Python. Another interesting read from the samples page: http://docs.wxwidgets.org/trunk/page_samples.html#page_samples_thread Maybe simply using wxMutexGUIEnter() / wxMutexGUILeave() will sort your problems, but I've not tried this method. Vincent -- Vincent Favre-Nicolin CEA Grenoble/INAC/SP2M http://inac.cea.fr Univ. Joseph Fourier (Grenoble) http://www.ujf-grenoble.fr ObjCryst Fox http://objcryst.sf.net/Fox - This SF.Net email is sponsored by the Moblin Your Move Developer's challenge Build the coolest Linux based applications with Moblin SDK win great prizes Grand prize is a trip for two to an Open Source event anywhere in the world http://moblin-contest.org/redirect.php?banner_id=100url=/ ___ Matplotlib-users mailing list Matplotlib-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/matplotlib-users
[Matplotlib-users] Colorbar values
Hi all, I'm trying to plot a colour bar for a scatter plot, and set the maximum value of the plot to something arbitrary. At the moment it always comes up as 255. How can I change this? ax = plt.gca() pts = ax.scatter(coords[:,0], coords[:,1], c=np.linspace(0,1,n_pts), s=16, edgecolors='k', linewidth=1) Also, there seem to be many different ways to make colorbars associate with certain objects like the colorbar keyword to scatter perhaps, but the simplest/only way to create a colorbar that I can get to work is: ax.figure.colorbar(ax.images[0]) Is there a better way to do this so the vmin and vmax attributes of the scatter plot get used in the colorbar? Thanks, Angus. -- AJC McMorland Post-doctoral research fellow Neurobiology, University of Pittsburgh - This SF.Net email is sponsored by the Moblin Your Move Developer's challenge Build the coolest Linux based applications with Moblin SDK win great prizes Grand prize is a trip for two to an Open Source event anywhere in the world http://moblin-contest.org/redirect.php?banner_id=100url=/ ___ Matplotlib-users mailing list Matplotlib-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/matplotlib-users
[Matplotlib-users] luminocity plot on hammer projection
Hi, I've done some poking an I can't find a way to use imshow() to plot a luminosity map on a hammer projection. (looking to generate a plot like http://en.wikipedia.org/wiki/Image:WMAP_2008.png). Just setting the projection in a call to subplot gives some axes and an off-center retangular image of my array. Bearing in mind that I am completely new to matplotlib, does anyone have an idea of how to get this sort of plot? Thanks, Kris (PS. Apologies if this shows up in two places, I'm not used to using mailing lists) -- View this message in context: http://www.nabble.com/luminocity-plot-on-hammer-projection-tp19829899p19829899.html Sent from the matplotlib - users mailing list archive at Nabble.com. - This SF.Net email is sponsored by the Moblin Your Move Developer's challenge Build the coolest Linux based applications with Moblin SDK win great prizes Grand prize is a trip for two to an Open Source event anywhere in the world http://moblin-contest.org/redirect.php?banner_id=100url=/ ___ Matplotlib-users mailing list Matplotlib-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/matplotlib-users
Re: [Matplotlib-users] luminocity plot on hammer projection
dasratsel wrote: Hi, I've done some poking an I can't find a way to use imshow() to plot a luminosity map on a hammer projection. (looking to generate a plot like http://en.wikipedia.org/wiki/Image:WMAP_2008.png). Just setting the projection in a call to subplot gives some axes and an off-center retangular image of my array. Bearing in mind that I am completely new to matplotlib, does anyone have an idea of how to get this sort of plot? Thanks, Kris (PS. Apologies if this shows up in two places, I'm not used to using mailing lists) Kris, For any sort of mapping like this, you will probably want to use basemap matplotlib toolkit, except that I don't see hammer among the supported projections. With straight mpl, imshow does not support projections. You could use pcolor (very slow) or pcolormesh. In neither case will you get interpolation; you will be specifying colored quadrilaterals. Eric - This SF.Net email is sponsored by the Moblin Your Move Developer's challenge Build the coolest Linux based applications with Moblin SDK win great prizes Grand prize is a trip for two to an Open Source event anywhere in the world http://moblin-contest.org/redirect.php?banner_id=100url=/ ___ Matplotlib-users mailing list Matplotlib-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/matplotlib-users
