Re: [PyQt] PyQt Digest, Vol 101, Issue 21
This seems to work (but I don't think its thread safe). You probably need to
use a mutex or semaphore somewhere.
This demo demonstrates how to embed a matplotlib (mpl) plot
into a PyQt4 GUI application, including:
* Using the navigation toolbar
* Adding data to the plot
* Dynamically modifying the plot's properties
* Processing mpl events
* Saving the plot to a file from a menu
The main goal is to serve as a basis for developing rich PyQt GUI
applications featuring mpl plots (using the mpl OO API).
Eli Bendersky (eli...@gmail.com)
License: this code is in the public domain
Last modified: 19.01.2009
import sys, os, random
import time
from PyQt4.QtCore import *
from PyQt4.QtGui import *
#from PyQt4.QtCore import QThread
import matplotlib
from matplotlib.backends.backend_qt4agg import FigureCanvasQTAgg as
FigureCanvas
from matplotlib.backends.backend_qt4agg import NavigationToolbar2QTAgg as
NavigationToolbar
from matplotlib.figure import Figure
class AppForm(QMainWindow):
def __init__(self, parent=None):
QMainWindow.__init__(self, parent)
self.setWindowTitle('Demo: PyQt with matplotlib')
self.create_menu()
self.create_main_frame()
self.create_status_bar()
self.textbox.setText('1 2 3 4')
self.on_draw()
def save_plot(self):
file_choices = PNG (*.png)|*.png
path = unicode(QFileDialog.getSaveFileName(self,
'Save file', '',
file_choices))
if path:
self.canvas.print_figure(path, dpi=self.dpi)
self.statusBar().showMessage('Saved to %s' % path, 2000)
def on_about(self):
msg = A demo of using PyQt with matplotlib:
* Use the matplotlib navigation bar
* Add values to the text box and press Enter (or click Draw)
* Show or hide the grid
* Drag the slider to modify the width of the bars
* Save the plot to a file using the File menu
* Click on a bar to receive an informative message
QMessageBox.about(self, About the demo, msg.strip())
def on_pick(self, event):
# The event received here is of the type
# matplotlib.backend_bases.PickEvent
#
# It carries lots of information, of which we're using
# only a small amount here.
#
box_points = event.artist.get_bbox().get_points()
msg = You've clicked on a bar with coords:\n %s % box_points
QMessageBox.information(self, Click!, msg)
def on_draw(self):
Redraws the figure
str = unicode(self.textbox.text())
self.data = map(int, str.split())
x = range(len(self.data))
# clear the axes and redraw the plot anew
#
self.axes.clear()
self.axes.grid(self.grid_cb.isChecked())
self.axes.bar(
left=x,
height=self.data,
width=self.slider.value() / 100.0,
align='center',
alpha=0.44,
picker=5)
self.canvas.draw()
def create_main_frame(self):
self.main_frame = QWidget()
# Create the mpl Figure and FigCanvas objects.
# 5x4 inches, 100 dots-per-inch
#
self.dpi = 100
self.fig = Figure((5.0, 4.0), dpi=self.dpi)
self.canvas = FigureCanvas(self.fig)
self.canvas.setParent(self.main_frame)
# Since we have only one plot, we can use add_axes
# instead of add_subplot, but then the subplot
# configuration tool in the navigation toolbar wouldn't
# work.
#
self.axes = self.fig.add_subplot(111)
# Bind the 'pick' event for clicking on one of the bars
#
self.canvas.mpl_connect('pick_event', self.on_pick)
# Create the navigation toolbar, tied to the canvas
#
self.mpl_toolbar = NavigationToolbar(self.canvas, self.main_frame)
# Other GUI controls
#
self.textbox = QLineEdit()
self.textbox.setMinimumWidth(200)
self.connect(self.textbox, SIGNAL('editingFinished ()'),
self.on_draw)
self.draw_button = QPushButton(Draw)
self.connect(self.draw_button, SIGNAL('clicked()'), self.on_draw)
self.grid_cb = QCheckBox(Show Grid)
self.grid_cb.setChecked(False)
self.connect(self.grid_cb, SIGNAL('stateChanged(int)'),
self.on_draw)
slider_label = QLabel('Bar width (%):')
self.slider = QSlider(Qt.Horizontal)
self.slider.setRange(1, 100)
self.slider.setValue(20)
self.slider.setTracking(True)
self.slider.setTickPosition(QSlider.TicksBothSides)
self.connect(self.slider, SIGNAL('valueChanged(int)'), self.on_draw)
#
# Layout with box sizers
#
hbox =
[PyQt] Error when compiling Py in Eric4
I received this reply to a bug I reported to the Eric 4 guys. When I add the
QtPlot widget in Qt to a Mainwindow dialog box it causes their Dialog
Compiler to crash.
Hi,
this is a PyQt4 issue. You should report it (together with a minimal
example) on the PyQt4 mailing list.
Regards,
Detlev
On Samstag, 5. Juni 2010, you wrote:
This error is apparently caused by the addition of a QtPlot widget.
When I removed it the error went away. Version Numbers:
Python 2.6.4
Qt 4.5.2
PyQt4 4.5.4
sip 4.8.2
QScintilla 2.4
eric4 4.4.4a (r3717)
Platform: win32
2.6.4 (r264:75708, Oct 26 2009, 08:23:19) [MSC v.1500 32 bit (Intel)]
Plugins Version Numbers:
PluginAbout 4.4.0
PluginEricapi 4.4.0
PluginEricdoc 4.4.0
PluginProjectPylons 1.0.0
PluginProjectWxPython 1.0.3
PluginSyntaxChecker 4.4.0
PluginTabnanny 4.4.0
PluginVcsPySvn 4.4.0
PluginVcsSubversion 4.4.0
PluginVmListspace 4.4.0
PluginVmMdiArea 4.4.0
PluginVmTabview 4.4.0
PluginVmWorkspace 4.4.0
PluginWizardPyRegExp 4.4.0
PluginWizardQColorDialog 4.4.0
PluginWizardQFileDialog 4.4.0
PluginWizardQFontDialog 4.4.0
PluginWizardQInputDialog 4.4.0
PluginWizardQMessageBox 4.4.0
PluginWizardQRegExp 4.4.0
CONTENTS OF ERROR LOG HERE v
2010-06-06, 01:48:30
type 'exceptions.TypeError':
'set' object does not support indexing
File C:\Python26\Lib\site-packages\eric4\Project\ProjectFormsBrowser.py,
line 815, in __generateDialogCode
dlg = CreateDialogCodeDialog(fn, self.project, self)
File
C:\Python26\Lib\site-packages\eric4\Project\CreateDialogCodeDialog.py,
line 99, in __init__
self.__updateSlotsModel()
File
C:\Python26\Lib\site-packages\eric4\Project\CreateDialogCodeDialog.py,
line 170, in __updateSlotsModel
dlg = uic.loadUi(self.formFile)
File C:\Python26\lib\site-packages\PyQt4\uic\__init__.py, line 112, in
loadUi
return DynamicUILoader().loadUi(uifile, baseinstance)
File C:\Python26\lib\site-packages\PyQt4\uic\Loader\loader.py, line 21,
in loadUi
return self.parse(filename)
File C:\Python26\lib\site-packages\PyQt4\uic\uiparser.py, line 768, in
parse
actor(elem)
File C:\Python26\lib\site-packages\PyQt4\uic\uiparser.py, line 616, in
createUserInterface
self.traverseWidgetTree(elem)
File C:\Python26\lib\site-packages\PyQt4\uic\uiparser.py, line 594, in
traverseWidgetTree
handler(self, child)
File C:\Python26\lib\site-packages\PyQt4\uic\uiparser.py, line 168, in
createWidget
self.traverseWidgetTree(elem)
File C:\Python26\lib\site-packages\PyQt4\uic\uiparser.py, line 594, in
traverseWidgetTree
handler(self, child)
File C:\Python26\lib\site-packages\PyQt4\uic\uiparser.py, line 162, in
createWidget
self.stack.push(self.setupObject(widgetClass(elem), parent, elem))
File C:\Python26\lib\site-packages\PyQt4\uic\uiparser.py, line 134, in
setupObject
obj = self.factory.createQObject(clsname, name, args, is_attribute)
File C:\Python26\lib\site-packages\PyQt4\uic\objcreator.py, line 57, in
createQObject
classType = self.findQObjectType(classname)
File C:\Python26\lib\site-packages\PyQt4\uic\objcreator.py, line 67, in
findQObjectType
w = module.search(classname)
File C:\Python26\lib\site-packages\PyQt4\uic\Loader\qobjectcreator.py,
line 24, in search
self._module = __import__(self._moduleName, {}, {}, self._classes)
Version Numbers:
Python 2.6.4
Qt 4.5.2
PyQt4 4.5.4
sip 4.8.2
QScintilla 2.4
eric4 4.4.4a (r3717)
Platform: win32
2.6.4 (r264:75708, Oct 26 2009, 08:23:19) [MSC v.1500 32 bit (Intel)]
Plugins Version Numbers:
PluginAbout 4.4.0
PluginEricapi 4.4.0
PluginEricdoc 4.4.0
PluginProjectPylons 1.0.0
PluginProjectWxPython 1.0.3
PluginSyntaxChecker 4.4.0
PluginTabnanny 4.4.0
PluginVcsPySvn 4.4.0
PluginVcsSubversion 4.4.0
PluginVmListspace 4.4.0
PluginVmMdiArea 4.4.0
PluginVmTabview 4.4.0
PluginVmWorkspace 4.4.0
PluginWizardPyRegExp 4.4.0
PluginWizardQColorDialog 4.4.0
PluginWizardQFileDialog 4.4.0
PluginWizardQFontDialog 4.4.0
PluginWizardQInputDialog 4.4.0
PluginWizardQMessageBox 4.4.0
PluginWizardQRegExp 4.4.0
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