Hello list,
A couple months ago, I spent quite a bit of time trying to figure out how
to use Qt designer create a GUI with an embedded MPL window. Unfortunately,
the Scipy cookbook page (
http://wiki.scipy.org/Cookbook/Matplotlib/Qt_with_IPython_and_Designer) is
very outdated. A recent post (
http://matplotlib.1069221.n5.nabble.com/Re-Keep-list-of-figures-or-plots-and-flip-through-list-using-UI-td44961.html)
brought up some questions about a use case very similar to mine, so I redid
my example and was going to write a quick tutorial for the docs.
Unfortunately, I'm not a Qt guru, so I thought that I would ask on the list
for some advice. The OP and I were both interested in being able to have a
list of figures that you could select from to change the plot window. The
embedding examples in the docs create subclasses of FigureClass* and embed
the plotting figure/axes/etc. This works but gets tricky, though, when
trying to switch plots. Also, for interactive IPython work, I didn't like
that the plotting objects were mixed in with all the QtGui.QWidget
attributes, which makes introspective searching painful. My solution was to
create a dictionary of matplotlib.figure.Figure objects that had all of the
plotting stuff defined. Then when I select a new plot from the list, the
old one is removed and a new FigureClass object is created using the
selected Figure object. Has anyone else successfully done something like
this? Is there a better way? Also, it seems if I zoom the current plot,
change to a new plot, and change back, the zoom region is retained. Anyone
know how to reset the zoom region?
Attached is my example: "window.py" is the Designer-created main window and
"custommpl.py" is the subclass of the main window that I wrote. It's about
as short as I could make it.
Thanks
Ryan
# -*- coding: utf-8 -*-
# Form implementation generated from reading ui file 'test2.ui'
#
# Created: Wed Feb 18 18:20:27 2015
# by: PyQt4 UI code generator 4.11.3
#
# WARNING! All changes made in this file will be lost!
from PyQt4 import QtCore, QtGui
try:
_fromUtf8 = QtCore.QString.fromUtf8
except AttributeError:
def _fromUtf8(s):
return s
try:
_encoding = QtGui.QApplication.UnicodeUTF8
def _translate(context, text, disambig):
return QtGui.QApplication.translate(context, text, disambig, _encoding)
except AttributeError:
def _translate(context, text, disambig):
return QtGui.QApplication.translate(context, text, disambig)
class Ui_MainWindow(object):
def setupUi(self, MainWindow):
MainWindow.setObjectName(_fromUtf8("MainWindow"))
MainWindow.resize(800, 600)
self.centralwidget = QtGui.QWidget(MainWindow)
self.centralwidget.setObjectName(_fromUtf8("centralwidget"))
self.gridLayout = QtGui.QGridLayout(self.centralwidget)
self.gridLayout.setObjectName(_fromUtf8("gridLayout"))
self.mplfigs = QtGui.QListWidget(self.centralwidget)
sizePolicy = QtGui.QSizePolicy(QtGui.QSizePolicy.Minimum, QtGui.QSizePolicy.Expanding)
sizePolicy.setHorizontalStretch(0)
sizePolicy.setVerticalStretch(0)
sizePolicy.setHeightForWidth(self.mplfigs.sizePolicy().hasHeightForWidth())
self.mplfigs.setSizePolicy(sizePolicy)
self.mplfigs.setMaximumSize(QtCore.QSize(200, 16777215))
self.mplfigs.setObjectName(_fromUtf8("mplfigs"))
self.gridLayout.addWidget(self.mplfigs, 0, 1, 1, 1)
self.mplwindow = QtGui.QWidget(self.centralwidget)
sizePolicy = QtGui.QSizePolicy(QtGui.QSizePolicy.Preferred, QtGui.QSizePolicy.Preferred)
sizePolicy.setHorizontalStretch(0)
sizePolicy.setVerticalStretch(0)
sizePolicy.setHeightForWidth(self.mplwindow.sizePolicy().hasHeightForWidth())
self.mplwindow.setSizePolicy(sizePolicy)
self.mplwindow.setObjectName(_fromUtf8("mplwindow"))
self.gridLayout.addWidget(self.mplwindow, 0, 0, 1, 1)
MainWindow.setCentralWidget(self.centralwidget)
self.retranslateUi(MainWindow)
QtCore.QMetaObject.connectSlotsByName(MainWindow)
def retranslateUi(self, MainWindow):
MainWindow.setWindowTitle(_translate("MainWindow", "MainWindow", None))
import sys
from PyQt4 import QtGui
import numpy as np
from matplotlib.figure import Figure
from matplotlib.backends.backend_qt4agg import (
FigureCanvasQTAgg as FigureCanvas,
NavigationToolbar2QT as NavigationToolbar)
from window import Ui_MainWindow
class Main(QtGui.QMainWindow, Ui_MainWindow):
def __init__(self, ):
super(Main, self).__init__()
self.setupUi(self)
self.mplvl = QtGui.QVBoxLayout(self.mplwindow)
self.mplfigs.itemClicked.connect(self.changefig)
fig = Figure()
self.addmpl(fig)
def addfigs(self, fig_dict):
self.fig_dict = fig_dict
names = list(fig_dict.keys())
self.mplfigs.addItems(names)
def addmpl(self, fig):
self.canvas = FigureCanvas(fig)
self.mplvl.addWidget(self.canvas)
self.canvas.draw()
self.toolbar = NavigationToolbar(self.canvas,
self, coordinates=True)
self.mplvl.addWidget(self.toolbar)
#self.addToolBar(self.toolbar)
def rmmpl(self,):
self.mplvl.removeWidget(self.canvas)
self.canvas.close()
self.mplvl.removeWidget(self.toolbar)
self.toolbar.close()
def changefig(self, item):
text = item.text()
self.rmmpl()
self.addmpl(self.fig_dict[text])
if __name__ == '__main__':
figs = {}
fig1 = Figure()
ax1f1 = fig1.add_subplot(111)
ax1f1.plot(np.random.rand(5))
figs['One Plot'] = fig1
fig2 = Figure()
ax1f2 = fig2.add_subplot(121)
ax1f2.plot(np.random.rand(5))
ax2f2 = fig2.add_subplot(122)
ax2f2.plot(np.random.rand(10))
figs['Two Plots'] = fig2
app = QtGui.QApplication([])
main = Main()
main.addfigs(figs)
main.show()
sys.exit(app.exec_())
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