class Myplot(QWidget):
# incoming, connected in sender widget (locally connected to self.process_sig_rx() )
sig_rx = pyqtSignal(object)
def __init__(self, parent):
super(Myplot, self).__init__(parent)
self.needs_calc = True # flag whether plot needs to be recalculated
self.needs_redraw = True # flag whether plot needs to be redrawn
self.tool_tip = "My first pyfda plot widget"
self.tab_label = "xxx"
class My_Input_Widget(QWidget):
"""
Template for user widget
"""
sig_rx = pyqtSignal(object) # incoming signals from input_tab_widgets
sig_tx = pyqtSignal(object) # outgoing signals to input_tab_widgets
def __init__(self, parent):
super(My_Input_Widget, self).__init__(parent)
self.tab_label = 'MyWdg'
self.tool_tip = ("<span>This is my first pyFDA widget!</span>")
self._construct_UI()
self.load_dict()
def process_sig_rx(self, dict_sig=None):
"""
Process signals coming from sig_rx
"""
logger.debug("Processing {0}: {1}".format(
type(dict_sig).__name__, dict_sig))
if 'data_changed' in dict_sig or 'view_changed' in dict_sig or 'specs_changed' in dict_sig:
self.load_dict()
def _construct_UI(self):
"""
Intitialize the widget, consisting of:
- Checkboxes for selecting the info to be displayed
- A large text window for displaying infos about the filter design
algorithm
"""
bfont = QFont()
bfont.setBold(True)
# ============== UI Layout =====================================
# widget / subwindow for filter infos
self.chkFiltDict = QCheckBox("FiltDict", self)
self.chkFiltDict.setToolTip("Show filter dictionary for debugging.")
self.layHChkBoxes = QHBoxLayout()
self.layHChkBoxes.addWidget(self.chkFiltDict)
self.layHChkBoxes.addStretch(1)
self.frmMain = QFrame(self)
self.frmMain.setLayout(self.layHChkBoxes)
self.txtFiltDict = QTextBrowser(self)
layVMain = QVBoxLayout()
layVMain.addWidget(self.frmMain)
layVMain.addWidget(self.txtFiltDict)
layVMain.setContentsMargins(*params['wdg_margins'])
self.setLayout(layVMain)
#----------------------------------------------------------------------
# GLOBAL SIGNALS & SLOTs
#----------------------------------------------------------------------
self.sig_rx.connect(self.process_sig_rx)
#----------------------------------------------------------------------
# LOCAL SIGNALS & SLOTs
#----------------------------------------------------------------------
self.chkFiltDict.clicked.connect(self._show_filt_dict)
#------------------------------------------------------------------------------
def load_dict(self):
"""
update docs and filter performance
"""
self._show_filt_dict()
#------------------------------------------------------------------------------
def _show_filt_dict(self):
"""
Print filter dict for debugging
"""
self.txtFiltDict.setVisible(self.chkFiltDict.isChecked())
fb_sorted = [
str(key) + ' : ' + str(fb.fil[0][key])
for key in sorted(fb.fil[0].keys())
]
dictstr = pprint.pformat(fb_sorted)
self.txtFiltDict.setText(dictstr)
class Plot_FFT_win(QMainWindow):
"""
Create a pop-up widget for displaying time and frequency view of an FFT
window.
Data is passed via the dictionary `win_dict` that is passed during construction.
"""
# incoming
sig_rx = pyqtSignal(object)
# outgoing
sig_tx = pyqtSignal(object)
def __init__(self, parent, win_dict_name="win_fft", sym=True):
super(Plot_FFT_win, self).__init__(parent)
self.needs_calc = True
self.needs_draw = True
self.bottom_f = -80 # min. value for dB display
self.bottom_t = -60
self.N = 128 # initial number of data points
self.pad = 8 # amount of zero padding
self.win_dict = fb.fil[0][win_dict_name]
self.sym = sym
self.setAttribute(Qt.WA_DeleteOnClose)
self.setWindowTitle('pyFDA Window Viewer')
self._construct_UI()
qwindow_stay_on_top(self, True)
#------------------------------------------------------------------------------
def closeEvent(self, event):
"""
Catch closeEvent (user has tried to close the window) and send a
signal to parent where window closing is registered before actually
closing the window.
"""
self.sig_tx.emit({'sender': __name__, 'closeEvent': ''})
event.accept()
#------------------------------------------------------------------------------
def process_sig_rx(self, dict_sig=None):
"""
Process signals coming from the navigation toolbar and from sig_rx
"""
logger.debug("Processing {0} | visible = {1}"\
.format(dict_sig, self.isVisible()))
if self.isVisible():
if 'data_changed' in dict_sig or 'home' in dict_sig or self.needs_calc:
self.draw()
self.needs_calc = False
self.needs_draw = False
elif 'view_changed' in dict_sig or self.needs_draw:
self.update_view()
self.needs_draw = False
elif ('ui_changed' in dict_sig and dict_sig['ui_changed'] == 'resized')\
or self.needs_redraw:
self.redraw()
else:
if 'data_changed' in dict_sig:
self.needs_calc = True
elif 'view_changed' in dict_sig:
self.needs_draw = True
elif 'ui_changed' in dict_sig and dict_sig[
'ui_changed'] == 'resized':
self.needs_redraw = True
def _construct_UI(self):
"""
Intitialize the widget, consisting of:
- Matplotlib widget with NavigationToolbar
- Frame with control elements
"""
self.chk_auto_N = QCheckBox(self)
self.chk_auto_N.setChecked(False)
self.chk_auto_N.setToolTip(
"Use number of points from calling routine.")
self.lbl_auto_N = QLabel("Auto " + to_html("N", frmt='i'))
self.led_N = QLineEdit(self)
self.led_N.setText(str(self.N))
self.led_N.setMaximumWidth(70)
self.led_N.setToolTip("<span>Number of window data points.</span>")
self.chk_log_t = QCheckBox("Log", self)
self.chk_log_t.setChecked(False)
self.chk_log_t.setToolTip("Display in dB")
self.led_log_bottom_t = QLineEdit(self)
self.led_log_bottom_t.setText(str(self.bottom_t))
self.led_log_bottom_t.setMaximumWidth(50)
self.led_log_bottom_t.setEnabled(self.chk_log_t.isChecked())
self.led_log_bottom_t.setToolTip(
"<span>Minimum display value for log. scale.</span>")
self.lbl_log_bottom_t = QLabel("dB", self)
self.lbl_log_bottom_t.setEnabled(self.chk_log_t.isChecked())
self.chk_norm_f = QCheckBox("Norm", self)
self.chk_norm_f.setChecked(True)
self.chk_norm_f.setToolTip(
"Normalize window spectrum for a maximum of 1.")
self.chk_half_f = QCheckBox("Half", self)
self.chk_half_f.setChecked(True)
self.chk_half_f.setToolTip(
"Display window spectrum in the range 0 ... 0.5 f_S.")
self.chk_log_f = QCheckBox("Log", self)
self.chk_log_f.setChecked(True)
self.chk_log_f.setToolTip("Display in dB")
self.led_log_bottom_f = QLineEdit(self)
self.led_log_bottom_f.setText(str(self.bottom_f))
self.led_log_bottom_f.setMaximumWidth(50)
self.led_log_bottom_f.setEnabled(self.chk_log_f.isChecked())
self.led_log_bottom_f.setToolTip(
"<span>Minimum display value for log. scale.</span>")
self.lbl_log_bottom_f = QLabel("dB", self)
self.lbl_log_bottom_f.setEnabled(self.chk_log_f.isChecked())
layHControls = QHBoxLayout()
layHControls.addWidget(self.chk_auto_N)
layHControls.addWidget(self.lbl_auto_N)
layHControls.addWidget(self.led_N)
layHControls.addStretch(1)
layHControls.addWidget(self.chk_log_t)
layHControls.addWidget(self.led_log_bottom_t)
layHControls.addWidget(self.lbl_log_bottom_t)
layHControls.addStretch(10)
layHControls.addWidget(self.chk_norm_f)
layHControls.addStretch(1)
layHControls.addWidget(self.chk_half_f)
layHControls.addStretch(1)
layHControls.addWidget(self.chk_log_f)
layHControls.addWidget(self.led_log_bottom_f)
layHControls.addWidget(self.lbl_log_bottom_f)
# self.tblFiltPerf = QTableWidget(self)
# self.tblFiltPerf.setAlternatingRowColors(True)
# # self.tblFiltPerf.verticalHeader().setVisible(False)
# self.tblFiltPerf.horizontalHeader().setHighlightSections(False)
# self.tblFiltPerf.horizontalHeader().setFont(bfont)
# self.tblFiltPerf.verticalHeader().setHighlightSections(False)
# self.tblFiltPerf.verticalHeader().setFont(bfont)
self.txtInfoBox = QTextBrowser(self)
#----------------------------------------------------------------------
# ### frmControls ###
#
# This widget encompasses all control subwidgets
#----------------------------------------------------------------------
self.frmControls = QFrame(self)
self.frmControls.setObjectName("frmControls")
self.frmControls.setLayout(layHControls)
#----------------------------------------------------------------------
# ### mplwidget ###
#
# main widget: Layout layVMainMpl (VBox) is defined with MplWidget,
# additional widgets can be added (like self.frmControls)
# The widget encompasses all other widgets.
#----------------------------------------------------------------------
self.mplwidget = MplWidget(self)
self.mplwidget.layVMainMpl.addWidget(self.frmControls)
self.mplwidget.layVMainMpl.setContentsMargins(*params['wdg_margins'])
#----------------------------------------------------------------------
# ### splitter ###
#
# This widget encompasses all control subwidgets
#----------------------------------------------------------------------
splitter = QSplitter(self)
splitter.setOrientation(Qt.Vertical)
splitter.addWidget(self.mplwidget)
splitter.addWidget(self.txtInfoBox)
# setSizes uses absolute pixel values, but can be "misused" by specifying values
# that are way too large: in this case, the space is distributed according
# to the _ratio_ of the values:
splitter.setSizes([3000, 1000])
self.setCentralWidget(splitter)
#self.setCentralWidget(self.mplwidget)
#----------------------------------------------------------------------
# Set subplots
#
self.ax = self.mplwidget.fig.subplots(nrows=1, ncols=2)
self.ax_t = self.ax[0]
self.ax_f = self.ax[1]
self.draw() # initial drawing
#----------------------------------------------------------------------
# GLOBAL SIGNALS & SLOTs
#----------------------------------------------------------------------
self.sig_rx.connect(self.process_sig_rx)
#----------------------------------------------------------------------
# LOCAL SIGNALS & SLOTs
#----------------------------------------------------------------------
self.chk_log_f.clicked.connect(self.update_view)
self.chk_log_t.clicked.connect(self.update_view)
self.led_log_bottom_t.editingFinished.connect(self.update_bottom)
self.led_log_bottom_f.editingFinished.connect(self.update_bottom)
self.chk_auto_N.clicked.connect(self.draw)
self.led_N.editingFinished.connect(self.draw)
self.chk_norm_f.clicked.connect(self.draw)
self.chk_half_f.clicked.connect(self.update_view)
self.mplwidget.mplToolbar.sig_tx.connect(self.process_sig_rx)
#------------------------------------------------------------------------------
def update_bottom(self):
"""
Update log bottom settings
"""
self.bottom_t = safe_eval(self.led_log_bottom_t.text(),
self.bottom_t,
sign='neg',
return_type='float')
self.led_log_bottom_t.setText(str(self.bottom_t))
self.bottom_f = safe_eval(self.led_log_bottom_f.text(),
self.bottom_f,
sign='neg',
return_type='float')
self.led_log_bottom_f.setText(str(self.bottom_f))
self.update_view()
#------------------------------------------------------------------------------
def calc_win(self):
"""
(Re-)Calculate the window and its FFT
"""
self.led_N.setEnabled(not self.chk_auto_N.isChecked())
if self.chk_auto_N.isChecked():
self.N = self.win_dict['win_len']
self.led_N.setText(str(self.N))
else:
self.N = safe_eval(self.led_N.text(),
self.N,
sign='pos',
return_type='int')
self.n = np.arange(self.N)
self.win = calc_window_function(self.win_dict,
self.win_dict['name'],
self.N,
sym=self.sym)
self.nenbw = self.N * np.sum(np.square(self.win)) / (np.square(
np.sum(self.win)))
self.scale = self.N / np.sum(self.win)
self.F = fftfreq(self.N * self.pad,
d=1. / fb.fil[0]['f_S']) # use zero padding
self.Win = np.abs(fft(self.win, self.N * self.pad))
if self.chk_norm_f.isChecked():
self.Win /= (self.N / self.scale
) # correct gain for periodic signals (coherent gain)
#------------------------------------------------------------------------------
def draw(self):
"""
Main entry point:
Re-calculate \|H(f)\| and draw the figure
"""
self.calc_win()
self.update_view()
self.update_info()
#------------------------------------------------------------------------------
def update_view(self):
"""
Draw the figure with new limits, scale etc without recalculating H(f)
"""
self.ax_t.cla()
self.ax_f.cla()
self.ax_t.set_xlabel(fb.fil[0]['plt_tLabel'])
self.ax_t.set_ylabel(r'$w[n] \; \rightarrow$')
self.ax_f.set_xlabel(fb.fil[0]['plt_fLabel'])
self.ax_f.set_ylabel(r'$W(f) \; \rightarrow$')
if self.chk_log_t.isChecked():
self.ax_t.plot(
self.n,
np.maximum(20 * np.log10(np.abs(self.win)), self.bottom_t))
else:
self.ax_t.plot(self.n, self.win)
if self.chk_half_f.isChecked():
F = self.F[:len(self.F * self.pad) // 2]
Win = self.Win[:len(self.F * self.pad) // 2]
else:
F = fftshift(self.F)
Win = fftshift(self.Win)
if self.chk_log_f.isChecked():
self.ax_f.plot(
F, np.maximum(20 * np.log10(np.abs(Win)), self.bottom_f))
nenbw = 10 * np.log10(self.nenbw)
unit_nenbw = "dB"
else:
self.ax_f.plot(F, Win)
nenbw = self.nenbw
unit_nenbw = "bins"
self.led_log_bottom_t.setEnabled(self.chk_log_t.isChecked())
self.lbl_log_bottom_t.setEnabled(self.chk_log_t.isChecked())
self.led_log_bottom_f.setEnabled(self.chk_log_f.isChecked())
self.lbl_log_bottom_f.setEnabled(self.chk_log_f.isChecked())
window_name = self.win_dict['name']
param_txt = ""
if self.win_dict['n_par'] > 0:
param_txt = " (" + self.win_dict['par'][1][
0] + " = {0:.3g})".format(self.win_dict['par'][2][0])
if self.win_dict['n_par'] > 1:
param_txt = param_txt[:-1]\
+ ", {0:s} = {1:.3g})".format(self.win_dict['par'][1][1], self.win_dict['par'][2][1])
self.mplwidget.fig.suptitle(r'{0} Window'.format(window_name) +
param_txt)
# create two empty patches
handles = [
mpl_patches.Rectangle(
(0, 0), 1, 1, fc="white", ec="white", lw=0, alpha=0)
] * 2
labels = []
labels.append("$NENBW$ = {0:.4g} {1}".format(nenbw, unit_nenbw))
labels.append("$CGAIN$ = {0:.4g}".format(self.scale))
self.ax_f.legend(handles,
labels,
loc='best',
fontsize='small',
fancybox=True,
framealpha=0.7,
handlelength=0,
handletextpad=0)
self.redraw()
#------------------------------------------------------------------------------
def update_info(self):
"""
Update the text info box for the window
"""
if 'info' in self.win_dict:
self.txtInfoBox.setText(self.win_dict['info'])
#------------------------------------------------------------------------------
def redraw(self):
"""
Redraw the canvas when e.g. the canvas size has changed
"""
self.mplwidget.redraw()
