[Matplotlib-users] Line2D on multiple plots?
Hi, I want to show the same data on multiple plots. Is it possible to re-use the Line2D object for that? t.m., line = axes1.plot(xdata, ydata, ...) ... axes2.lines.append(line) Or is a Line2D bound to a certain axes instance? Best regards Ole -- Let Crystal Reports handle the reporting - Free Crystal Reports 2008 30-Day trial. Simplify your report design, integration and deployment - and focus on what you do best, core application coding. Discover what's new with Crystal Reports now. http://p.sf.net/sfu/bobj-july ___ Matplotlib-users mailing list Matplotlib-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/matplotlib-users
Re: [Matplotlib-users] Resize error with Qt4 backend
Hi Brian, I have also some layout problems with the Qt4 backend. The worst one is a SegFault when adjusting the width. Brian Zambrano bri...@gmail.com writes: vbox = QVBoxLayout() vbox.addWidget(self.canvas) self.setLayout(vbox) Could you just try to add a second canvas to the layout? vbox = QVBoxLayout() vbox.addWidget(self.canvas1) vbox.addWidget(self.canvas2) self.setLayout(vbox) and then try to adjust the size by moving the separator between the central and right widget? In my code, I can reproduce a crash here on Linux. Also, depending on the speed (content) of the canvases, the width is not always ajusted correctly. I am still not sure whether this is fault of Qt, PyQt, or matplotlib. Thanks Ole -- ___ Matplotlib-users mailing list Matplotlib-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/matplotlib-users
Re: [Matplotlib-users] Resize error with Qt4 backend
Hello Darren,
Darren Dale dsdal...@gmail.com writes:
I can't produce a segfault with the attached script. I have Qt-4.5.2,
PyQt-4.5.1, and a checkout of the matplotlib trunk.
OK, in this context it seems to work.
I attach a script that shows the problem.
Run it, move the second diagram below the first, adjust their sizes so
that they take roughly the same size:
+---+---+
| Diagram 1 | |
| | |
| | Hello |
+---+ World |
| Diagram 2 | |
| | |
| | |
+---+---+
(you will see that the Diagram 2 will not alway update properly :-( [*] )
and then move the slider between the diagrams and the Hello World
label. There is a good chance that the program will segfault. If it does
not, increase the number of points in the diagrams.
BTW,could you reproduce my last example with diagram and scrollbar? It
still remains unsolved (and is reproduced here [*]).
Versions (all 64 bit):
openSUSE 11.1:
Qt Open Source Edition 4.4.3
PyQt 4.4.3
Matplotlib 0.98.5.2
Kubuntu 9.04:
Qt Open Source Edition 4.5.0
PyQt 4.4.4
Matplotlib 0.98.5.2
Best regards
Ole
import random
import sys
from PyQt4 import QtGui, QtCore
from matplotlib.backends.backend_qt4agg import FigureCanvasQTAgg as FigureCanvas
from matplotlib.figure import Figure,SubplotParams
class AppForm(QtGui.QMainWindow):
def __init__(self, parent=None):
QtGui.QMainWindow.__init__(self, parent)
self.create_dock_widgets()
self.resize(700, 600)
def create_dock_widgets(self):
self.setDockNestingEnabled(True)
w1 = QtGui.QDockWidget('Diagram 1', self)
self.addDockWidget(QtCore.Qt.TopDockWidgetArea, w1)
w1.setWidget(InnerDiagramWidget(self))
w2 = QtGui.QDockWidget('Diagram 2', self)
self.addDockWidget(QtCore.Qt.TopDockWidgetArea, w2)
w2.setWidget(InnerDiagramWidget(self))
w3 = QtGui.QDockWidget('Label', self)
self.addDockWidget(QtCore.Qt.TopDockWidgetArea, w3)
w3.setWidget(QtGui.QLabel('Hello World'))
class InnerDiagramWidget(FigureCanvas):
def __init__(self, parent):
fig = Figure()
self.axes = fig.add_subplot(111)
# Increase this number to rise your chances for a segfault.
range = xrange(1000)
l = [ random.randint(-5, 5) for i in range ]
self.axes.plot(range, l, drawstyle='steps')
FigureCanvas.__init__(self, fig)
self.setParent(parent)
FigureCanvas.setSizePolicy(self,
QtGui.QSizePolicy.Expanding,
QtGui.QSizePolicy.Expanding)
FigureCanvas.updateGeometry(self)
a = QtGui.QApplication(sys.argv)
w = AppForm()
w.show()
a.exec_()
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Re: [Matplotlib-users] Resize error with Qt4 backend
Hello Darren,
Darren Dale dsdal...@gmail.com writes:
I can't produce a segfault with the attached script. I have Qt-4.5.2,
PyQt-4.5.1, and a checkout of the matplotlib trunk.
OK, in this context it seems to work.
I attach a script that shows the problem.
Run it, move the second diagram below the first, adjust their sizes so
that they take roughly the same size:
+---+---+
| Diagram 1 | |
| | |
| | Hello |
+---+ World |
| Diagram 2 | |
| | |
| | |
+---+---+
(you will see that the Diagram 2 will not always update properly :-( [*] )
and then move the slider between the diagrams and the Hello World
label. There is a good chance that the program will segfault. If it does
not, increase the number of points in the diagrams.
BTW, could you reproduce my last example with diagram and scrollbar? It
still remains unsolved (and is reproduced here [*]).
Versions (all 64 bit):
openSUSE 11.1:
Qt Open Source Edition 4.4.3
PyQt 4.4.3
Matplotlib 0.98.5.2
Kubuntu 9.04:
Qt Open Source Edition 4.5.0
PyQt 4.4.4
Matplotlib 0.98.5.2
Best regards
Ole
8---
import random
import sys
from PyQt4 import QtGui, QtCore
from matplotlib.backends.backend_qt4agg import FigureCanvasQTAgg as FigureCanvas
from matplotlib.figure import Figure,SubplotParams
class AppForm(QtGui.QMainWindow):
def __init__(self, parent=None):
QtGui.QMainWindow.__init__(self, parent)
self.create_dock_widgets()
self.resize(700, 600)
def create_dock_widgets(self):
self.setDockNestingEnabled(True)
w1 = QtGui.QDockWidget('Diagram 1', self)
self.addDockWidget(QtCore.Qt.TopDockWidgetArea, w1)
w1.setWidget(InnerDiagramWidget(self))
w2 = QtGui.QDockWidget('Diagram 2', self)
self.addDockWidget(QtCore.Qt.TopDockWidgetArea, w2)
w2.setWidget(InnerDiagramWidget(self))
w3 = QtGui.QDockWidget('Label', self)
self.addDockWidget(QtCore.Qt.TopDockWidgetArea, w3)
w3.setWidget(QtGui.QLabel('Hello World'))
class InnerDiagramWidget(FigureCanvas):
def __init__(self, parent):
fig = Figure()
self.axes = fig.add_subplot(111)
# Increase this number to rise your chances for a segfault.
range = xrange(1000)
l = [ random.randint(-5, 5) for i in range ]
self.axes.plot(range, l, drawstyle='steps')
FigureCanvas.__init__(self, fig)
self.setParent(parent)
FigureCanvas.setSizePolicy(self,
QtGui.QSizePolicy.Expanding,
QtGui.QSizePolicy.Expanding)
FigureCanvas.updateGeometry(self)
a = QtGui.QApplication(sys.argv)
w = AppForm()
w.show()
a.exec_()
8---
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Re: [Matplotlib-users] Strange resize behaviour for qt backend
Hi, could anyone reproduce this problem and/or has a solution for it? Is there anything wrong with my code? Best regards Ole Ole Streicher ole-usenet-s...@gmx.net writes: Hi Darren, Darren Dale dsdal...@gmail.com writes: I am really busy with other things, and can't offer suggestions unless you post a short, simple, standalone script that demonstrates the problem. Sure: 8- import random import sys from PyQt4 import QtGui, QtCore from matplotlib.backends.backend_qt4agg import FigureCanvasQTAgg as FigureCanvas from matplotlib.figure import Figure,SubplotParams class DiagramWidget(QtGui.QWidget): def __init__(self, parent): QtGui.QWidget.__init__(self, parent) layout = QtGui.QVBoxLayout(self) self.setLayout(layout) self.diagram = InnerDiagramWidget(self) self.scrollbar = QtGui.QScrollBar(QtCore.Qt.Horizontal, self) layout.addWidget(self.diagram) layout.addWidget(self.scrollbar) def resizeEvent(self, event): print 'figure resize to', event.size() QtGui.QWidget.resizeEvent(self, event) class InnerDiagramWidget(FigureCanvas): def __init__(self, parent): fig = Figure() self.axes = fig.add_subplot(111) range = xrange(1) l = [ random.randint(-5, 5) for i in range ] self.axes.plot(range, l, drawstyle='steps') FigureCanvas.__init__(self, fig) self.setParent(parent) FigureCanvas.setSizePolicy(self, QtGui.QSizePolicy.Expanding, QtGui.QSizePolicy.Expanding) FigureCanvas.updateGeometry(self) def resizeEvent(self, event): print 'scroll resize to', event.size() FigureCanvas.resizeEvent(self, event) a = QtGui.QApplication(sys.argv) w = QtGui.QMainWindow() w.setCentralWidget(DiagramWidget(w)) w.show() a.exec_() 8- To see the problem undisturbed, you may remove the resizeEvent() functions. Best regards Ole -- Are you an open source citizen? Join us for the Open Source Bridge conference! Portland, OR, June 17-19. Two days of sessions, one day of unconference: $250. Need another reason to go? 24-hour hacker lounge. Register today! http://ad.doubleclick.net/clk;215844324;13503038;v?http://opensourcebridge.org ___ Matplotlib-users mailing list Matplotlib-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/matplotlib-users
[Matplotlib-users] updating changed diagram?
Hi, I want to change the value of a line in an axes. What I tried is myline = axes.plot(...) xdata, ydata = myline.get_data() for i in range(ydata.__len__()): ydata[i] += 50 to shift all y values up by 50. But I dont see the change I made, even after a show(). How can I force the diagram to show the changed value? Regards Ole -- Crystal Reports - New Free Runtime and 30 Day Trial Check out the new simplified licensing option that enables unlimited royalty-free distribution of the report engine for externally facing server and web deployment. http://p.sf.net/sfu/businessobjects ___ Matplotlib-users mailing list Matplotlib-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/matplotlib-users
Re: [Matplotlib-users] updating changed diagram?
Hi Mathias, Matthias Michler matthiasmich...@gmx.net writes: you can reset the ydata using: ydata = myline.get_ydata() ydata += 50 myline.set_ydata(ydata) # pass new data to line object Does this work for you? Yes. Altough I dont understand why I have to set it again (the ydata still belong to the curve) Thanks, Ole -- Crystal Reports - New Free Runtime and 30 Day Trial Check out the new simplified licensing option that enables unlimited royalty-free distribution of the report engine for externally facing server and web deployment. http://p.sf.net/sfu/businessobjects ___ Matplotlib-users mailing list Matplotlib-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/matplotlib-users
[Matplotlib-users] Removing picked line
Hi again, when right-clicking on one or more lines in a plot, I want to present the user a context menu where he can select to remove these lines. Preferrably I want to do this not with a 'pick_event' connection but with the (Qt) backend methods since the context menu should contain more options (which shall be shown also when right-clicking on the diagram background). Unfortunately, I have no idea, how to do this. At first, I found only the pick_event() which responds to a left mouse click. Is there a way to get the Line2D instances that would be picked by specifying the mouse position? At second, if I have a Line2D instance: how can I remove it from the axes? Best regards Ole -- Crystal Reports - New Free Runtime and 30 Day Trial Check out the new simplified licensing option that enables unlimited royalty-free distribution of the report engine for externally facing server and web deployment. http://p.sf.net/sfu/businessobjects ___ Matplotlib-users mailing list Matplotlib-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/matplotlib-users
Re: [Matplotlib-users] Removing picked line
Hi John,
John Hunter jdh2...@gmail.com writes:
If for some reason the built in pick_event is unsuitable, you can
create your own matplotlib.backend_bases.MouseEvent and call
line.contains(event) for each line you want to hit test.
Thank you, that works for me. But for some reason, the y coordinate is
inversed in Qt and matplotlib? I have to specify
def get_lines_at_point(self, point):
mpl_event = MouseEvent('button_press_event', self,
point.x(), self.height() - point.y())
#
ret = [ ]
for line in self.axes.get_lines():
picked, details = line.contains(mpl_event)
if picked:
ret.append(line)
return ret
The other question that now remains is: how can I remove a line from an
axes?
Best regards
Ole
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Re: [Matplotlib-users] Removing picked line
Hi John, John Hunter jdh2...@gmail.com writes: On Wed, Jun 10, 2009 at 9:11 AM, John Hunterjdh2...@gmail.com wrote: ax.lines.remove(someline) fig.canvas.draw() See also http://matplotlib.sourceforge.net/users/artists.html Thank you very much, this helped a lot. (the manpages to artists and axes are a bit complicated to use since they are far too long) Best regards Ole -- Crystal Reports - New Free Runtime and 30 Day Trial Check out the new simplified licensing option that enables unlimited royalty-free distribution of the report engine for externally facing server and web deployment. http://p.sf.net/sfu/businessobjects ___ Matplotlib-users mailing list Matplotlib-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/matplotlib-users
[Matplotlib-users] qt4: Transforming to display coordinates
Hi,
I want to implement a cursor on a diagram using native Qt routines. For
this, I would need to transform data (axis) coordinates to display
coordinates.
The manual of matplotlib, API axes just jays that there are some
public attributes 'transData' and 'transAxis', but without an
explanation.
So, if I have something like
class DiagramWidget(FigureCanvas):
def __init__(self, parent):
fig = Figure()
self.axes = fig.add_subplot(111)
self.xlimits = (0, 4000)
FigureCanvas.__init__(self, fig)
self.setParent(parent)
self.mpl_connect('motion_notify_event', self.on_move)
def on_move(self, event)
mouse_pos_diag_x = ???(event.xdata)
mouse_pos_diag_y = ???(event.ydata)
lower_limit_diag_y = ???
upper_limit_diag_y = ???
...
where I would need to replace the ??? with some transformation from
event.xdata, event.ydata, and the min and max of the y axis. How could I
do that?
Cheers
Ole
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[Matplotlib-users] Get coordinates at moouse position
Hi again, when I scroll or zoom with the mouse wheel, the scaling of the x and y axes are changed within the event. I would need now the new value of these to update the status bar. How can I get them without waiting for a new mouse event? Cheers Ole -- OpenSolaris 2009.06 is a cutting edge operating system for enterprises looking to deploy the next generation of Solaris that includes the latest innovations from Sun and the OpenSource community. Download a copy and enjoy capabilities such as Networking, Storage and Virtualization. Go to: http://p.sf.net/sfu/opensolaris-get ___ Matplotlib-users mailing list Matplotlib-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/matplotlib-users
Re: [Matplotlib-users] qt4: Transforming to display coordinates
Hi John, thank you four your helpful answer. John Hunter jdh2...@gmail.com writes: On Thu, Jun 4, 2009 at 8:49 AM, Ole Streicher ole-usenet-s...@gmx.net wrote: def on_move(self, event) mouse_pos_diag_x = ???(event.xdata) mouse_pos_diag_y = ???(event.ydata) where I would need to replace the ??? with some transformation from event.xdata, event.ydata, and the min and max of the y axis. How could I do that? The mouse event object already has display coords attached in the event.x and event.y attributes. My example was a bit simplified. What I want to do is to connect several diagrams to show the same cursor. For the diagram with the mouse in it, I can get ofcourse pixel coordinates, too. But for all other diagrams I need to convert the cursor position to pixel coordinates. But to answer your question about matplotlib transforms. You could do ax = event.inaxes # the axes the event occurred in x, y = ax.transData.transform_point((event.xdata, event.ydata)) This is exactly what I need. Does the reverse transformation also exist? Cheers Ole -- OpenSolaris 2009.06 is a cutting edge operating system for enterprises looking to deploy the next generation of Solaris that includes the latest innovations from Sun and the OpenSource community. Download a copy and enjoy capabilities such as Networking, Storage and Virtualization. Go to: http://p.sf.net/sfu/opensolaris-get ___ Matplotlib-users mailing list Matplotlib-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/matplotlib-users
Re: [Matplotlib-users] Get coordinates at moouse position
Hi John, John Hunter jdh2...@gmail.com writes: On Thu, Jun 4, 2009 at 9:00 AM, Ole Streicher ole-usenet-s...@gmx.net wrote: when I scroll or zoom with the mouse wheel, the scaling of the x and y axes are changed within the event. I would need now the new value of these to update the status bar. How can I get them without waiting for a new mouse event? Not sure I understand the question... Could you be more specific, maybe post a code sample? The point is that there may occure changes in the diagram axes that are not connected to a mouse event. Example: I use the Qt backend, and defined an QAction zoom in connected to the Ctrl-+ key. At the same time, the status bar of my application shows the position of the mouse in the diagram. Usually, the updates of the position is connected to the motion_notify_event which returns the mouse position on change. When the mouse is not moved, but the zoom in action is triggered (via hotkey in this example), I would need to update the status bar so that it shows the coordinated that are under the mouse cursor *after* the zoom was applied. Does this make my problem better understandable? Cheers Ole -- OpenSolaris 2009.06 is a cutting edge operating system for enterprises looking to deploy the next generation of Solaris that includes the latest innovations from Sun and the OpenSource community. Download a copy and enjoy capabilities such as Networking, Storage and Virtualization. Go to: http://p.sf.net/sfu/opensolaris-get ___ Matplotlib-users mailing list Matplotlib-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/matplotlib-users
[Matplotlib-users] button_press_event: Key presses not recognized?
Hi again,
I have another problem: I try to connect Control + mouse drag to some
zoom event. On mouse press, I need to check whether the Ctrol key is
pressed:
8
import random
import sys
from PyQt4 import QtGui, QtCore
from matplotlib.backends.backend_qt4agg import FigureCanvasQTAgg as FigureCanvas
from matplotlib.figure import Figure,SubplotParams
class InnerDiagramWidget(FigureCanvas):
def __init__(self, parent):
fig = Figure()
fig.add_subplot(111)
FigureCanvas.__init__(self, fig)
self.setParent(parent)
self.mpl_connect('button_press_event', self.on_button_press)
def on_button_press(self, event):
print event.key, event.button, event.xdata
if event.key == 'control':
print 'This should start the zoom but never happens'
a = QtGui.QApplication(sys.argv)
w = QtGui.QMainWindow()
w.setCentralWidget(InnerDiagramWidget(w))
w.show()
a.exec_()
8
The key returned here is always None. Why??? The API
(matplotlib.backend_bases.MouseEvent) says that it should return
control?
$ uname -a
Linux myos 2.6.27.21-0.1-default #1 SMP 2009-03-31 14:50:44 +0200 x86_64 x86_64
x86_64 GNU/Linux
$ python -c import matplotlib; print matplotlib.__version__
0.98.5.2
I guess this is a bug in matplotlib? Can one confirm that?
Best regards
Ole
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Re: [Matplotlib-users] Strange resize behaviour for qt backend
Hallo Theodore, Drain, Theodore R theodore.r.dr...@jpl.nasa.gov writes: Remember, this is not a multi-threaded system. You can't receive a second repaint event while the drawing code is happening because the event loop is not in a separate thread. This is not my choice. If the user resizes the window, the events are created in that manner. And I cannot prevent the user from resizing the window. Best regards Ole -- Register Now for Creativity and Technology (CaT), June 3rd, NYC. CaT is a gathering of tech-side developers brand creativity professionals. Meet the minds behind Google Creative Lab, Visual Complexity, Processing, iPhoneDevCamp as they present alongside digital heavyweights like Barbarian Group, R/GA, Big Spaceship. http://p.sf.net/sfu/creativitycat-com ___ Matplotlib-users mailing list Matplotlib-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/matplotlib-users
[Matplotlib-users] Strange resize behaviour for qt backend
Hi,
I am using matplotlib for some data vizualization. To ensure a
consistent user interface among the whole application, I do the
scrolling/zooming stuff myself. So, for a diagram, a horizontal
scrollbar is displayed below the diagram that enabled to shift along the
x axis. This is (part of) the code:
8---
from PyQt4 import QtGui, QtCore
from matplotlib.figure import Figure,SubplotParams
class DiagramWidget(QtGui.QWidget):
def __init__(self, parent):
QtGui.QWidget.__init__(self, parent)
layout = QtGui.QVBoxLayout(self)
self.diagram = InnerDiagramWidget(self)
self.scrollbar = QtGui.QScrollBar(QtCore.Qt.Horizontal, self)
self.connect(self.scrollbar, QtCore.SIGNAL('valueChanged(int)'),
self.diagram.scroll_event)
layout.addWidget(self.diagram)
layout.addWidget(self.scrollbar)
# ...
class InnerDiagramWidget(FigureCanvas):
def __init__(self, parent):
fig = Figure(facecolor = 'w',
subplotpars = SubplotParams(left = 0.08, right=0.96,
bottom = 0.1, top=0.98))
self.axes = fig.add_subplot(111)
FigureCanvas.__init__(self, fig)
FigureCanvas.setParent(self, parent)
FigureCanvas.setSizePolicy(self,
QtGui.QSizePolicy.Expanding,
QtGui.QSizePolicy.Expanding)
FigureCanvas.updateGeometry(self)
def scroll_event(self, x):
pass # here is real code ofcourse
# ...
8---
However, when I put this DiagramWidget into a window and try to resize
it vertically by mouse (with some data ... about 4000 points), the
scrollbar is not alwas shown correctly.
One can see that the diagram widget size does not change with every mouse
move, and the scrollbar sometimes goes out of the visible window, where
it is unusable.
The similar occurres in the horizontal direction: sometimes the
scrollbar gets not updated properly. This is the case when the Figure
canvas takes a long time for update.
If I put the scrollbar on top of the widget, everything is fine, except
that is the wrong place for a scrollbar :-)
Is this a bug in FigureCanvas, in Qt or in my code? How can I debug and
solve this?
Best regards
Ole
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