def __init__(self, parent=None):
QMainWindow.__init__(self, parent)
self.setWindowTitle('Audio Spectral Analyzer')
self.create_menu()
self.create_main_frame()
self.create_status_bar()
self.capture = Capture(fs=44100)
self.timer = QTimer()
self.timer.connect(self.timer, SIGNAL("timeout()"), self.on_draw)
self.timer.start(20)
class AppForm(QMainWindow):
def __init__(self, parent=None):
QMainWindow.__init__(self, parent)
self.setWindowTitle('Audio Spectral Analyzer')
self.create_menu()
self.create_main_frame()
self.create_status_bar()
self.capture = Capture(fs=44100)
self.timer = QTimer()
self.timer.connect(self.timer, SIGNAL("timeout()"), self.on_draw)
self.timer.start(20)
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 = """Use fft from numpy and matplotlib for plotting:
"""
QMessageBox.about(self, "About the Audio Spectral Analyzer",
msg.strip())
def on_draw(self):
""" Redraws the figure
"""
# clear the axes and redraw the plot anew
#
self.axes.clear()
freq, amplitude = FFT(data=self.capture.get()).calculate()
if freq.size > 10:
self.axes.plot(freq, amplitude)
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)
# Create the navigation toolbar, tied to the canvas
#
self.mpl_toolbar = NavigationToolbar(self.canvas, self.main_frame)
#
# Layout with box sizers
#
vbox = QVBoxLayout()
vbox.addWidget(self.canvas)
vbox.addWidget(self.mpl_toolbar)
self.main_frame.setLayout(vbox)
self.setCentralWidget(self.main_frame)
def create_status_bar(self):
self.status_text = QLabel("Audio Spectral Analyzer")
self.statusBar().addWidget(self.status_text, 1)
def create_menu(self):
self.file_menu = self.menuBar().addMenu("&File")
load_file_action = self.create_action("&Save plot",
shortcut="Ctrl+S", slot=self.save_plot,
tip="Save the plot")
quit_action = self.create_action("&Quit", slot=self.close,
shortcut="Ctrl+Q", tip="Close the application")
self.add_actions(self.file_menu,
(load_file_action, None, quit_action))
self.help_menu = self.menuBar().addMenu("&Help")
about_action = self.create_action("&About",
shortcut='F1', slot=self.on_about,
tip='About the demo')
self.add_actions(self.help_menu, (about_action,))
def add_actions(self, target, actions):
for action in actions:
if action is None:
target.addSeparator()
else:
target.addAction(action)
def create_action( self, text, slot=None, shortcut=None,
icon=None, tip=None, checkable=False,
signal="triggered()"):
action = QAction(text, self)
if icon is not None:
action.setIcon(QIcon(":/%s.png" % icon))
if shortcut is not None:
action.setShortcut(shortcut)
if tip is not None:
action.setToolTip(tip)
action.setStatusTip(tip)
if slot is not None:
self.connect(action, SIGNAL(signal), slot)
if checkable:
action.setCheckable(True)
return action