#! /usr/bin/env python
# embedding_in_qt.py --- Simple Qt application embedding matplotlib canvases
#
# Copyright (C) 2005 Florent Rougon
#
# 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.
from __future__ import unicode_literals
import sys, os, random
from qt import *
from numpy import arange, sin, pi
from matplotlib.backends.backend_qtagg import FigureCanvasQTAgg as FigureCanvas
from matplotlib.figure import Figure
# This seems to be what PyQt expects, according to the examples shipped in
# its distribution.
TRUE = 1
FALSE = 0
progname = os.path.basename(sys.argv[0])
progversion = "0.1"
# Note: color-intensive applications may require a different color allocation
# strategy.
#QApplication.setColorSpec(QApplication.NormalColor)
app = QApplication(sys.argv)
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):
self.fig = Figure(figsize=(width, height), dpi=dpi)
self.axes = self.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, self.fig)
self.reparent(parent, QPoint(0, 0))
FigureCanvas.setSizePolicy(self,
QSizePolicy.Expanding,
QSizePolicy.Expanding)
FigureCanvas.updateGeometry(self)
def sizeHint(self):
w, h = self.get_width_height()
return QSize(w, h)
def minimumSizeHint(self):
return QSize(10, 10)
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 = QTimer(self, "canvas update timer")
QObject.connect(timer, SIGNAL("timeout()"), self.update_figure)
timer.start(1000, FALSE)
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 range(4) ]
self.axes.plot([0, 1, 2, 3], l, 'r')
self.draw()
class ApplicationWindow(QMainWindow):
def __init__(self):
QMainWindow.__init__(self, None,
"application main window",
Qt.WType_TopLevel | Qt.WDestructiveClose)
self.file_menu = QPopupMenu(self)
self.file_menu.insertItem('&Quit', self.fileQuit, Qt.CTRL + Qt.Key_Q)
self.menuBar().insertItem('&File', self.file_menu)
self.help_menu = QPopupMenu(self)
self.menuBar().insertSeparator()
self.menuBar().insertItem('&Help', self.help_menu)
self.help_menu.insertItem('&About', self.about)
self.main_widget = QWidget(self, "Main widget")
l = QVBoxLayout(self.main_widget)
sc = MyStaticMplCanvas(self.main_widget, width=5, height=4, dpi=100)
dc = MyDynamicMplCanvas(self.main_widget, width=5, height=4, dpi=100)
l.addWidget(sc)
l.addWidget(dc)
self.main_widget.setFocus()
self.setCentralWidget(self.main_widget)
self.statusBar().message("All hail matplotlib!", 2000)
def fileQuit(self):
qApp.exit(0)
def closeEvent(self, ce):
self.fileQuit()
def about(self):
QMessageBox.about(self, "About %s" % progname,
"""%(prog)s version %(version)s
Copyright \N{COPYRIGHT SIGN} 2005 Florent Rougon
This program is a simple example of a Qt application embedding matplotlib
canvases.
It may be used and modified with no restriction; raw copies as well as
modified versions may be distributed without limitation."""
% {"prog": progname, "version": progversion})
aw = ApplicationWindow()
aw.setCaption("%s" % progname)
qApp.setMainWidget(aw)
aw.show()
sys.exit(qApp.exec_loop())
Keywords: python, matplotlib, pylab, example, codex (see Search examples)