Hi all,
I'm posting to report two bugs in 'backend_qt4.py' with the latest PyQt
release:
(see eventually the attached test script)
(1) in class 'NavigationToolbar2QT' l. 285-300 : I had to replace '.svg'
by '.png' for all the icons to be displayed correctly on the navigation
toolbar (only one was already loaded in the right file format).
(2) I still experience slow performance of pan/zoom feature with the
latest PyQt release (the last release for which I had no problem is the
4.3.3 release). You'll find attached a simple test script: with PyQt
4.3.3 pan/zoom is real-time, and with PyQt 4.4.3 it's really slower (in
fact, zooming and panning are happening at the right speed but after a
short delay from the mouse click)
Regards,
Pierre Raybaut
#!/usr/bin/env python
import sys, os
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
from matplotlib.backends.backend_qt4 import NavigationToolbar2QT
from matplotlib.backend_bases import NavigationToolbar2
class MplCanvas(FigureCanvas):
def __init__(self, parent=None, width=5, height=4, dpi=100):
fig = Figure(figsize=(width, height), dpi=dpi)
self.axes = fig.add_subplot(111)
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):
t = arange(0.0, 3.0, 0.01)
self.axes.plot(t, sin(2*pi*t))
class Toolbar(NavigationToolbar2QT) :
def __init__(self , parent , canvas, coordinates=True) :
self.canvas = canvas
self.coordinates = coordinates
QtGui.QWidget.__init__( self, parent )
NavigationToolbar2.__init__( self, canvas )
NavigationToolbar2.pan(self)
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)
sc = MplCanvas(self.main_widget, width=5, height=4, dpi=100)
l.addWidget(sc)
l.addWidget(Toolbar(sc , sc))
self.main_widget.setFocus()
self.setCentralWidget(self.main_widget)
qApp = QtGui.QApplication(sys.argv)
aw = ApplicationWindow()
aw.show()
sys.exit(qApp.exec_())-------------------------------------------------------------------------
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