# Copyright 2012 Free Software Foundation, Inc.
#
# This file is part of GNU Radio
#
# SPDX-License-Identifier: GPL-3.0-or-later
#
#

import sys
import os
import re
import csv
import copy
import warnings
from optparse import OptionParser

from gnuradio import filter, fft

try:
    import numpy as np
except ImportError:
    raise SystemExit('Please install NumPy to run this script (https://www.np.org/)')

try:
    import numpy.fft as fft_detail
except ImportError:
    raise SystemExit('Could not import fft implementation of numpy')
    
try:
    from numpy import poly1d
except ImportError:
    raise SystemExit('Please install NumPy to run this script (https://www.np.org)')

try:
    from scipy import signal
except ImportError:
    raise SystemExit('Please install SciPy to run this script (https://www.scipy.org)')

try:
    from PyQt5 import Qt, QtCore, QtWidgets
except ImportError:
    raise SystemExit('Please install PyQt5 to run this script (https://www.riverbankcomputing.com/software/pyqt/download5)')

try:
    import pyqtgraph as pg
except ImportError:
    raise SystemExit('Please install pyqtgraph to run this script (http://www.pyqtgraph.org)')


try:
    from gnuradio.filter.pyqt_filter_stacked import Ui_MainWindow
except ImportError:
    raise SystemExit('Could not import from pyqt_filter_stacked. Please build with "pyuic5 pyqt_filter_stacked.ui -o pyqt_filter_stacked.py"')

try:
    from gnuradio.filter.banditems import *
except ImportError:
    raise SystemExit('Could not import from banditems. Please check whether banditems.py is in the library path')

try:
    from gnuradio.filter.polezero_plot import *
except ImportError:
    raise SystemExit('Could not import from polezero_plot. Please check whether polezero_plot.py is in the library path')

# Behavior is not quite working on 3.8 - TODO
# try:
#     from gnuradio.filter.idealbanditems import *
# except ImportError:
#     raise SystemExit('Could not import from idealbanditems. Please check whether idealbanditems.py is in the library path')

try:
    from gnuradio.filter.api_object import *
except ImportError:
    raise SystemExit('Could not import from api_object. Please check whether api_object.py is in the library path')

try:
    from gnuradio.filter.fir_design import *
except ImportError:
    raise SystemExit('Could not import from fir_design. Please check whether fir_design.py is in the library path')

try:
    _fromUtf8 = QtCore.QString.fromUtf8
except AttributeError:
    def _fromUtf8(s): return s

# Gnuradio Filter design tool main window
class gr_plot_filter(QtGui.QMainWindow):
    def __init__(self, options, callback=None, restype=""):
        QtGui.QWidget.__init__(self, None)
        self.gui = Ui_MainWindow()
        self.callback = callback

        # Set Global pyqtgraph options
        pg.setConfigOption('foreground', 'k')   # Default foreground color for text, lines, axes, etc.
        pg.setConfigOption('background', None)  # Default background for GraphicsView.
        pg.setConfigOptions(antialias=True)     # Draw lines with smooth edges at the cost of reduced performance.

        self.gui.setupUi(self)

        # Remove other filter combobox entry if some restriction is specified.
        if restype == "iir":
            ind = self.gui.fselectComboBox.findText("FIR")
            if ind != -1:
                self.gui.fselectComboBox.removeItem(ind)
        elif restype == "fir":
            ind = self.gui.fselectComboBox.findText("IIR(scipy)")
            if ind != -1:
                self.gui.fselectComboBox.removeItem(ind)

        self.gui.action_save.triggered.connect(self.action_save_dialog)
        self.gui.action_save.setEnabled(False)
        self.gui.action_open.triggered.connect(self.action_open_dialog)

        self.gui.filterTypeComboBox.currentIndexChanged['const QString&'].connect(self.changed_filter_type)
        self.gui.iirfilterBandComboBox.currentIndexChanged['const QString&'].connect(self.changed_iirfilter_band)
        self.gui.filterDesignTypeComboBox.currentIndexChanged['const QString&'].connect(self.changed_filter_design_type)
        self.gui.fselectComboBox.currentIndexChanged['const QString&'].connect(self.changed_fselect)
        self.gui.iirfilterTypeComboBox.currentIndexChanged['const QString&'].connect(self.set_order)

        self.gui.designButton.released.connect(self.design)

#        self.gui.tabGroup.currentChanged['int'].connect(self.tab_changed)

        self.gui.nfftEdit.textEdited['QString'].connect(self.nfft_edit_changed)

        self.gui.actionQuick_Access.triggered.connect(self.action_quick_access)

        self.gui.actionSpec_Widget.triggered.connect(self.action_spec_widget)

        self.gui.actionResponse_Widget.triggered.connect(self.action_response_widget)

        self.gui.actionDesign_Widget.triggered.connect(self.action_design_widget)

        self.gui.actionMagnitude_Response.triggered.connect(self.set_actmagresponse)

        self.gui.actionGrid_2.triggered.connect(self.set_actgrid)

        self.gui.actionPhase_Respone.triggered.connect(self.set_actphase)

        self.gui.actionGroup_Delay.triggered.connect(self.set_actgdelay)

        self.gui.actionFilter_Coefficients.triggered.connect(self.set_actfcoeff)

        self.gui.actionBand_Diagram.triggered.connect(self.set_actband)

        # self.gui.actionIdeal_Band.triggered.connect(self.set_drawideal)

        self.gui.actionPole_Zero_Plot_2.triggered.connect(self.set_actpzplot)

        self.gui.actionGridview.triggered.connect(self.set_switchview)

        self.gui.actionPlot_select.triggered.connect(self.set_plotselect)

        self.gui.actionPhase_Delay.triggered.connect(self.set_actpdelay)

        self.gui.actionImpulse_Response.triggered.connect(self.set_actimpres)

        self.gui.actionStep_Response.triggered.connect(self.set_actstepres)

        self.gui.mfmagPush.released.connect(self.set_mfmagresponse)

        self.gui.mfphasePush.released.connect(self.set_mfphaseresponse)

        self.gui.mfgpdlyPush.released.connect(self.set_mfgroupdelay)

        self.gui.mfphdlyPush.released.connect(self.set_mfphasedelay)

        self.gui.mfoverlayPush.clicked.connect(self.set_mfoverlay)

        self.gui.conjPush.clicked.connect(self.set_conj)

        self.gui.mconjPush.clicked.connect(self.set_mconj)

        self.gui.addzeroPush.clicked.connect(self.set_zeroadd)

        self.gui.maddzeroPush.clicked.connect(self.set_mzeroadd)

        self.gui.addpolePush.clicked.connect(self.set_poleadd)

        self.gui.maddpolePush.clicked.connect(self.set_mpoleadd)

        self.gui.delPush.clicked.connect(self.set_delpz)

        self.gui.mdelPush.clicked.connect(self.set_mdelpz)

        self.gui.mttapsPush.clicked.connect(self.set_mttaps)

        self.gui.mtstepPush.clicked.connect(self.set_mtstep)

        self.gui.mtimpPush.clicked.connect(self.set_mtimpulse)

        self.gui.checkKeepcur.stateChanged['int'].connect(self.set_bufferplots)

        self.gui.checkGrid.stateChanged['int'].connect(self.set_grid)

        self.gui.checkMagres.stateChanged['int'].connect(self.set_magresponse)

        self.gui.checkGdelay.stateChanged['int'].connect(self.set_gdelay)

        self.gui.checkPhase.stateChanged['int'].connect(self.set_phase)

        self.gui.checkFcoeff.stateChanged['int'].connect(self.set_fcoeff)

        self.gui.checkBand.stateChanged['int'].connect(self.set_band)

        self.gui.checkPzplot.stateChanged['int'].connect(self.set_pzplot)

        self.gui.checkPdelay.stateChanged['int'].connect(self.set_pdelay)

        self.gui.checkImpulse.stateChanged['int'].connect(self.set_impres)

        self.gui.checkStep.stateChanged['int'].connect(self.set_stepres)

        self.gridenable = False
        self.mfoverlay  = False
        self.mtoverlay  = False
        self.iir        = False

        self.mfmagresponse = True
        self.mfphaseresponse = False
        self.mfgroupdelay = False
        self.mfphasedelay = False

        self.mttaps = True
        self.mtstep = False
        self.mtimpulse = False

        
        self.gui.designButton.setShortcut(QtCore.Qt.Key_Return)

        self.taps = []
        self.a = []
        self.b = []
        self.fftdB = []
        self.fftDeg = []
        self.groupDelay = []
        self.phaseDelay = []
        self.gridview = 0
        self.params = []
        self.nfftpts = int(10000)
        self.gui.nfftEdit.setText(str(self.nfftpts))

        self.firFilters = ("Low Pass", "Band Pass", "Complex Band Pass", "Band Notch",
                           "High Pass", "Root Raised Cosine", "Gaussian", "Half Band")
        self.optFilters = ("Low Pass", "Band Pass", "Complex Band Pass",
                           "Band Notch", "High Pass", "Half Band")

        self.set_windowed()

        # Initialize to LPF.
        self.gui.filterTypeWidget.setCurrentWidget(self.gui.firlpfPage)
        self.gui.iirfilterTypeComboBox.hide()
        self.gui.iirfilterBandComboBox.hide()
        self.gui.adComboBox.hide()
        self.gui.addpolePush.setEnabled(False)
        self.gui.maddpolePush.setEnabled(False)

        # Create plots.
        self.plots = {'FREQ': None, 'TIME': None, 'PHASE': None, 'GROUP': None,
                      'IMPRES': None, 'STEPRES': None, 'PDELAY': None}
        self.mplots = {'mFREQ': None, 'mTIME': None}

        self.plots['FREQ'] = self.gui.freqPlot
        self.plots['TIME'] = self.gui.timePlot
        self.plots['PHASE'] = self.gui.phasePlot
        self.plots['GROUP'] = self.gui.groupPlot
        self.plots['IMPRES'] = self.gui.impresPlot
        self.plots['STEPRES'] = self.gui.stepresPlot
        self.plots['PDELAY'] = self.gui.pdelayPlot

        # for i in self.plots:
            # self.plots[i] = pg.PlotWidget(enableMenu=False, viewBox=CustomViewBox())
            # self.plots[i].plotItem.vb = CustomViewBox()
        
        self.mplots['mFREQ'] = self.gui.mfreqPlot
        self.mplots['mTIME'] = self.gui.mtimePlot


        # for i in self.mplots:
        #     self.mplots[i] = pg.PlotWidget(enableMenu=False, viewBox=CustomViewBox())

        # # Add plots to layouts.
        # self.gui.freqTab.layout().addWidget(self.plots['FREQ'])
        # self.gui.timeTab.layout().addWidget(self.plots['TIME'])
        # self.gui.phaseTab.layout().addWidget(self.plots['PHASE'])
        # self.gui.groupTab.layout().addWidget(self.plots['GROUP'])
        # self.gui.impresTab.layout().addWidget(self.plots['IMPRES'])
        # self.gui.stepresTab.layout().addWidget(self.plots['STEPRES'])
        # self.gui.pdelayTab.layout().addWidget(self.plots['PDELAY'])
        # self.gui.mfreqTab.layout().addWidget(self.mplots['mFREQ'])
        # self.gui.mtimeTab.layout().addWidget(self.mplots['mTIME'])

        # Set Axis Labels.
        self.labelstyle11b = {'font-family': 'Helvetica', 'font-size': '11pt', 'font-weight': 'bold'}

        self.plots['FREQ'].setLabel('bottom', 'Frequency', units='Hz', **self.labelstyle11b)
        self.plots['FREQ'].setLabel('left', 'Magnitude', units='dB', **self.labelstyle11b)

        self.plots['TIME'].setLabel('bottom', 'Tap number', **self.labelstyle11b)
        self.plots['TIME'].setLabel('left', 'Amplitude', **self.labelstyle11b)

        self.plots['PHASE'].setLabel('bottom', 'Frequency', units='Hz', **self.labelstyle11b)
        self.plots['PHASE'].setLabel('left', 'Phase', units='Radians', **self.labelstyle11b)

        self.plots['GROUP'].setLabel('bottom', 'Frequency', units='Hz', **self.labelstyle11b)
        self.plots['GROUP'].setLabel('left', 'Delay', units='seconds', **self.labelstyle11b)

        self.plots['IMPRES'].setLabel('bottom', 'n', units='Samples', **self.labelstyle11b)
        self.plots['IMPRES'].setLabel('left', 'Amplitude', **self.labelstyle11b)

        self.plots['STEPRES'].setLabel('bottom', 'n', units='Samples', **self.labelstyle11b)
        self.plots['STEPRES'].setLabel('left', 'Amplitude', **self.labelstyle11b)

        self.plots['PDELAY'].setLabel('bottom', 'Frequency', units='Hz', **self.labelstyle11b)
        self.plots['PDELAY'].setLabel('left', 'Phase Delay', units='Radians', **self.labelstyle11b)

        self.labelstyle9b = {'font-family': 'Helvetica', 'font-size': '9pt', 'font-weight': 'bold'}

        self.mplots['mTIME'].setLabel('bottom', 'n', units='Samples/taps', **self.labelstyle9b)
        self.mplots['mTIME'].setLabel('left', 'Amplitude', **self.labelstyle9b)

        # Set up axes.
        for i in self.plots:
            axis = self.plots[i].getAxis('bottom')
            axis.setStyle(tickLength=-10)
            axis = self.plots[i].getAxis('left')
            axis.setStyle(tickLength=-10)

        for i in self.mplots:
            axis = self.mplots[i].getAxis('bottom')
            axis.setStyle(tickLength=-10)
            axis = self.mplots[i].getAxis('left')
            axis.setStyle(tickLength=-10)

        # Set up plot curves.
        self.rcurve = self.plots['TIME'].plot(title="Real")
        self.icurve = self.plots['TIME'].plot(title="Imag")
        self.mtimecurve = self.mplots['mTIME'].plot(title="PSD")
        self.mtimecurve_stems = self.mplots['mTIME'].plot(connect='pairs', name='Stems')
        self.mtimecurve_i_stems = self.mplots['mTIME'].plot(connect='pairs', name='Stems')
        self.mtimecurve_i = self.mplots['mTIME'].plot(title="Impulse Response Imag")

        self.plots['FREQ'].enableAutoRange(enable=True)
        self.freqcurve = self.plots['FREQ'].plot(title="PSD")

        # For the frequency view, set up linked x axes
        self.primary_freq_overlay = self.mplots['mFREQ']
        self.mfreqcurve = self.primary_freq_overlay.plot(title="PSD")
        self.secondary_freq_overlay_vb = CustomViewBox()
        self.primary_freq_overlay.scene().addItem(self.secondary_freq_overlay_vb)
        self.primary_freq_overlay.getAxis('right').linkToView(self.secondary_freq_overlay_vb)
        self.mfreqcurve2 = pg.PlotCurveItem()
        # self.secondary_freq_overlay_vb.setGeometry(self.primary_freq_overlay.plotItem.vb.sceneBoundingRect())
        self.secondary_freq_overlay_vb.setXLink(self.primary_freq_overlay)
        self.secondary_freq_overlay_vb.addItem(self.mfreqcurve2)
        self.primary_freq_overlay.plotItem.vb.sigResized.connect(self.updateViews)

        self.phasecurve = self.plots['PHASE'].plot(title="Phase")

        self.groupcurve = self.plots['GROUP'].plot(title="Group Delay")

        self.imprescurve_stems = self.plots['IMPRES'].plot(connect='pairs', name='Stems')

        self.imprescurve = self.plots['IMPRES'].plot(title="Impulse Response")

        self.imprescurve_i_stems = self.plots['IMPRES'].plot(connect='pairs', name='Stems')

        self.imprescurve_i = self.plots['IMPRES'].plot(title="Impulse Response Imag")

        self.steprescurve_stems = self.plots['STEPRES'].plot(connect='pairs', name='Stems')

        self.steprescurve = self.plots['STEPRES'].plot(title="Step Response")

        self.steprescurve_i_stems = self.plots['STEPRES'].plot(connect='pairs', name='Stems')

        self.steprescurve_i = self.plots['STEPRES'].plot(title="Step Response Imag")

        self.pdelaycurve = self.plots['PDELAY'].plot(title="Phase Delay")

        # Disable Ideal Band for now
        # self.idbanditems = IdealBandItems()
        

        self.set_defaultpen()

        # Assigning items.
        self.lpfitems = lpfItems
        self.hpfitems = hpfItems
        self.bpfitems = bpfItems
        self.bnfitems = bnfItems

        # Connect signals.
        self.lpfitems[0].attenChanged.connect(self.set_fatten)
        self.hpfitems[0].attenChanged.connect(self.set_fatten)
        self.bpfitems[0].attenChanged.connect(self.set_fatten)
        self.bnfitems[0].attenChanged.connect(self.set_fatten)

        # Populate the Band-diagram scene.
        self.scene = QtGui.QGraphicsScene()
        self.scene.setSceneRect(0,0,250,250)
        lightback = QtGui.qRgb(0xf8, 0xf8, 0xff)
        backbrush = Qt.QBrush(Qt.QColor(lightback))
        self.scene.setBackgroundBrush(backbrush)
        self.gui.bandView.setScene(self.scene)
        self.gui.mbandView.setScene(self.scene)

        # Install Canvas picker for pz-plot.
        self.cpicker = CanvasPicker(self.gui.pzPlot)
        self.cpicker.curveChanged.connect(self.set_curvetaps)
        self.cpicker.mouseposChanged.connect(self.set_statusbar)

        self.cpicker2 = CanvasPicker(self.gui.mpzPlot)
        self.cpicker2.curveChanged.connect(self.set_mcurvetaps)
        self.cpicker2.mouseposChanged.connect(self.set_mstatusbar)
        # Edit boxes for band-diagrams (Not required todate so may be remove?).
        """
        self.lpfpassEdit = QtGui.QLineEdit()
        self.lpfpassEdit.setMaximumSize(QtCore.QSize(75,20))
        self.lpfpassEdit.setText('Not set')
        self.lpfstartproxy = QtGui.QGraphicsProxyWidget()
        self.lpfstartproxy.setWidget(self.lpfpassEdit)
        self.lpfstartproxy.setPos(400,30)

        self.lpfstopEdit = QtGui.QLineEdit()
        self.lpfstopEdit.setMaximumSize(QtCore.QSize(75,20))
        self.lpfstopEdit.setText('Not set')
        self.lpfstopproxy = QtGui.QGraphicsProxyWidget()
        self.lpfstopproxy.setWidget(self.lpfstopEdit)
        self.lpfstopproxy.setPos(400,50)
        self.lpfitems.append(self.lpfstartproxy)
        self.lpfitems.append(self.lpfstopproxy)
        """
        self.populate_bandview(self.lpfitems)

        # Set up validators for edit boxes.
        self.intVal = Qt.QIntValidator(None)
        self.dblVal = Qt.QDoubleValidator(None)
        self.gui.nfftEdit.setValidator(self.intVal)
        self.gui.sampleRateEdit.setValidator(self.dblVal)
        self.gui.filterGainEdit.setValidator(self.dblVal)
        self.gui.endofLpfPassBandEdit.setValidator(self.dblVal)
        self.gui.startofLpfStopBandEdit.setValidator(self.dblVal)
        self.gui.lpfStopBandAttenEdit.setValidator(self.dblVal)
        self.gui.lpfPassBandRippleEdit.setValidator(self.dblVal)
        self.gui.startofBpfPassBandEdit.setValidator(self.dblVal)
        self.gui.endofBpfPassBandEdit.setValidator(self.dblVal)
        self.gui.bpfTransitionEdit.setValidator(self.dblVal)
        self.gui.bpfStopBandAttenEdit.setValidator(self.dblVal)
        self.gui.bpfPassBandRippleEdit.setValidator(self.dblVal)
        self.gui.startofBnfStopBandEdit.setValidator(self.dblVal)
        self.gui.endofBnfStopBandEdit.setValidator(self.dblVal)
        self.gui.bnfTransitionEdit.setValidator(self.dblVal)
        self.gui.bnfStopBandAttenEdit.setValidator(self.dblVal)
        self.gui.bnfPassBandRippleEdit.setValidator(self.dblVal)
        self.gui.endofHpfStopBandEdit.setValidator(self.dblVal)
        self.gui.startofHpfPassBandEdit.setValidator(self.dblVal)
        self.gui.hpfStopBandAttenEdit.setValidator(self.dblVal)
        self.gui.hpfPassBandRippleEdit.setValidator(self.dblVal)
        self.gui.rrcSymbolRateEdit.setValidator(self.dblVal)
        self.gui.rrcAlphaEdit.setValidator(self.dblVal)
        self.gui.rrcNumTapsEdit.setValidator(self.dblVal)
        self.gui.gausSymbolRateEdit.setValidator(self.dblVal)
        self.gui.gausBTEdit.setValidator(self.dblVal)
        self.gui.gausNumTapsEdit.setValidator(self.dblVal)
        self.gui.iirendofLpfPassBandEdit.setValidator(self.dblVal)
        self.gui.iirstartofLpfStopBandEdit.setValidator(self.dblVal)
        self.gui.iirLpfPassBandAttenEdit.setValidator(self.dblVal)
        self.gui.iirLpfStopBandRippleEdit.setValidator(self.dblVal)
        self.gui.iirstartofHpfPassBandEdit.setValidator(self.dblVal)
        self.gui.iirendofHpfStopBandEdit.setValidator(self.dblVal)
        self.gui.iirHpfPassBandAttenEdit.setValidator(self.dblVal)
        self.gui.iirHpfStopBandRippleEdit.setValidator(self.dblVal)
        self.gui.iirstartofBpfPassBandEdit.setValidator(self.dblVal)
        self.gui.iirendofBpfPassBandEdit.setValidator(self.dblVal)
        self.gui.iirendofBpfStopBandEdit1.setValidator(self.dblVal)
        self.gui.iirstartofBpfStopBandEdit2.setValidator(self.dblVal)
        self.gui.iirBpfPassBandAttenEdit.setValidator(self.dblVal)
        self.gui.iirBpfStopBandRippleEdit.setValidator(self.dblVal)
        self.gui.iirendofBsfPassBandEdit1.setValidator(self.dblVal)
        self.gui.iirstartofBsfPassBandEdit2.setValidator(self.dblVal)
        self.gui.iirstartofBsfStopBandEdit.setValidator(self.dblVal)
        self.gui.iirendofBsfStopBandEdit.setValidator(self.dblVal)
        self.gui.iirBsfPassBandAttenEdit.setValidator(self.dblVal)
        self.gui.iirBsfStopBandRippleEdit.setValidator(self.dblVal)
        self.gui.besselordEdit.setValidator(self.intVal)
        self.gui.iirbesselcritEdit1.setValidator(self.dblVal)
        self.gui.iirbesselcritEdit2.setValidator(self.dblVal)

        self.gui.nTapsEdit.setText("0")

        self.filterWindows = {"Hamming Window" : fft.window.WIN_HAMMING,
                              "Hann Window" : fft.window.WIN_HANN,
                              "Blackman Window" : fft.window.WIN_BLACKMAN,
                              "Rectangular Window" : fft.window.WIN_RECTANGULAR,
                              "Kaiser Window" : fft.window.WIN_KAISER,
                              "Blackman-harris Window" : fft.window.WIN_BLACKMAN_hARRIS}
        self.EQUIRIPPLE_FILT = 6 # const for equiripple filter window types.



        # Disable functionality that is not quite working in 3.8
        self.gui.checkKeepcur.setEnabled(False)
        self.gui.actionIdeal_Band.setEnabled(False)

        self.show()

    def updateViews(self):
        # for linking overlay graphs on GridView freq plots
        self.secondary_freq_overlay_vb.setGeometry(self.primary_freq_overlay.plotItem.vb.sceneBoundingRect())

    # Set up curve pens, lines, and symbols.
    def set_defaultpen(self):
        blue = QtGui.qRgb(0x00, 0x00, 0xFF)
        blueBrush = Qt.QBrush(Qt.QColor(blue))
        red = QtGui.qRgb(0xFF, 0x00, 0x00)
        redBrush = Qt.QBrush(Qt.QColor(red))

        self.freqcurve.setPen(pg.mkPen('b', width=1.5))

        self.rcurve.setPen(None)
        self.rcurve.setSymbol('o')
        self.rcurve.setSymbolPen('b')
        self.rcurve.setSymbolBrush(Qt.QBrush(Qt.Qt.gray))
        self.rcurve.setSymbolSize(8)

        self.icurve.setPen(None)
        self.icurve.setSymbol('o')
        self.icurve.setSymbolPen('r')
        self.icurve.setSymbolBrush(Qt.QBrush(Qt.Qt.gray))
        self.icurve.setSymbolSize(8)

        self.imprescurve_stems.setPen(pg.mkPen('b', width=1.5))

        self.imprescurve.setPen(None)
        self.imprescurve.setSymbol('o')
        self.imprescurve.setSymbolPen('b')
        self.imprescurve.setSymbolBrush(Qt.QBrush(Qt.Qt.gray))
        self.imprescurve.setSymbolSize(8)

        self.imprescurve_i_stems.setPen(pg.mkPen('b', width=1.5))

        self.imprescurve_i.setPen(None)
        self.imprescurve_i.setSymbol('o')
        self.imprescurve_i.setSymbolPen('r')
        self.imprescurve_i.setSymbolBrush(Qt.QBrush(Qt.Qt.gray))
        self.imprescurve_i.setSymbolSize(8)

        self.steprescurve_stems.setPen(pg.mkPen('b', width=1.5))

        self.steprescurve.setPen(None)
        self.steprescurve.setSymbol('o')
        self.steprescurve.setSymbolPen('b')
        self.steprescurve.setSymbolBrush(Qt.QBrush(Qt.Qt.gray))
        self.steprescurve.setSymbolSize(8)

        self.steprescurve_i_stems.setPen(pg.mkPen('b', width=1.5))

        self.steprescurve_i.setPen(None)
        self.steprescurve_i.setSymbol('o')
        self.steprescurve_i.setSymbolPen('r')
        self.steprescurve_i.setSymbolBrush(Qt.QBrush(Qt.Qt.gray))
        self.steprescurve_i.setSymbolSize(8)

        self.phasecurve.setPen(pg.mkPen('b', width=1.5))
        self.groupcurve.setPen(pg.mkPen('b', width=1.5))
        self.pdelaycurve.setPen(pg.mkPen('b', width=1.5))
        # self.idbanditems.setLinetype()

        self.mfreqcurve.setPen(pg.mkPen('b', width=1.5))
        self.mfreqcurve2.setPen(pg.mkPen('r', width=1.5))

        self.mtimecurve.setPen(None)
        self.mtimecurve.setSymbol('o')
        self.mtimecurve.setSymbolPen('b')
        self.mtimecurve.setSymbolBrush(Qt.QBrush(Qt.Qt.gray))
        self.mtimecurve.setSymbolSize(8)

        self.mtimecurve_stems.setPen(pg.mkPen('b', width=1.5))
        self.mtimecurve_i_stems.setPen(pg.mkPen('b', width=1.5))

        self.mtimecurve_i.setPen(None)
        self.mtimecurve_i.setSymbol('o')
        self.mtimecurve_i.setSymbolPen('r')
        self.mtimecurve_i.setSymbolBrush(Qt.QBrush(Qt.Qt.gray))
        self.mtimecurve_i.setSymbolSize(8)


    def changed_fselect(self, ftype):
        if(ftype == "FIR"):
            self.gui.iirfilterTypeComboBox.hide()
            self.gui.iirfilterBandComboBox.hide()
            self.gui.adComboBox.hide()
            self.gui.filterDesignTypeComboBox.show()
            self.gui.globalParamsBox.show()
            self.gui.filterTypeComboBox.show()
            self.gui.filterTypeWidget.setCurrentWidget(self.gui.firlpfPage)
            self.gui.tabGroup.addTab(self.gui.timeTab, _fromUtf8("Filter Taps"))
            self.gui.mttapsPush.setEnabled(True)
            self.gui.addpolePush.setEnabled(False)
            self.gui.maddpolePush.setEnabled(False)
        elif(ftype.startswith("IIR")):
            self.gui.filterDesignTypeComboBox.hide()
            self.gui.globalParamsBox.hide()
            self.gui.filterTypeComboBox.hide()
            self.gui.iirfilterTypeComboBox.show()
            self.gui.adComboBox.show()
            self.gui.iirfilterBandComboBox.show()
            self.gui.filterTypeWidget.setCurrentWidget(self.gui.iirlpfPage)
            self.gui.tabGroup.removeTab(self.gui.tabGroup.indexOf(self.gui.timeTab))
            self.gui.mttapsPush.setEnabled(False)
            self.gui.addpolePush.setEnabled(True)
            self.gui.maddpolePush.setEnabled(True)

#self.design()

    def set_order(self, ftype):
        if(ftype == "Bessel"):
            self.gui.filterTypeWidget.setCurrentWidget(self.gui.iirbesselPage)
            self.changed_iirfilter_band(self.gui.iirfilterBandComboBox.currentText())
        else:
            self.changed_iirfilter_band(self.gui.iirfilterBandComboBox.currentText())

#self.design()

    def changed_iirfilter_band(self, ftype):
        iirftype = self.gui.iirfilterTypeComboBox.currentText()
        if(ftype == "Low Pass"):
            if(iirftype == "Bessel"):
                self.gui.filterTypeWidget.setCurrentWidget(self.gui.iirbesselPage)
                self.gui.iirbesselcritLabel2.hide()
                self.gui.iirbesselcritEdit2.hide()
            else:
                self.gui.filterTypeWidget.setCurrentWidget(self.gui.iirlpfPage)
        elif(ftype == "Band Pass"):
            if(iirftype == "Bessel"):
                self.gui.filterTypeWidget.setCurrentWidget(self.gui.iirbesselPage)
                self.gui.iirbesselcritLabel2.show()
                self.gui.iirbesselcritEdit2.show()
            else:
                self.gui.filterTypeWidget.setCurrentWidget(self.gui.iirbpfPage)
        elif(ftype == "Band Stop"):
            if(iirftype == "Bessel"):
                self.gui.filterTypeWidget.setCurrentWidget(self.gui.iirbesselPage)
                self.gui.iirbesselcritLabel2.show()
                self.gui.iirbesselcritEdit2.show()
            else:
                self.gui.filterTypeWidget.setCurrentWidget(self.gui.iirbsfPage)
        elif(ftype == "High Pass"):
            if(iirftype == "Bessel"):
                self.gui.filterTypeWidget.setCurrentWidget(self.gui.iirbesselPage)
                self.gui.iirbesselcritLabel2.hide()
                self.gui.iirbesselcritEdit2.hide()
            else:
                self.gui.filterTypeWidget.setCurrentWidget(self.gui.iirhpfPage)

#self.design()

    def changed_filter_type(self, ftype):
        if(ftype == "Low Pass"):
            self.gui.filterTypeWidget.setCurrentWidget(self.gui.firlpfPage)
            self.remove_bandview()
            self.populate_bandview(self.lpfitems)
        elif(ftype == "Band Pass"):
            self.gui.filterTypeWidget.setCurrentWidget(self.gui.firbpfPage)
            self.remove_bandview()
            self.populate_bandview(self.bpfitems)
        elif(ftype == "Complex Band Pass"):
            self.gui.filterTypeWidget.setCurrentWidget(self.gui.firbpfPage)
            self.remove_bandview()
            self.populate_bandview(self.bpfitems)
        elif(ftype == "Band Notch"):
            self.gui.filterTypeWidget.setCurrentWidget(self.gui.firbnfPage)
            self.remove_bandview()
            self.populate_bandview(self.bnfitems)
        elif(ftype == "High Pass"):
            self.gui.filterTypeWidget.setCurrentWidget(self.gui.firhpfPage)
            self.remove_bandview()
            self.populate_bandview(self.hpfitems)
        elif(ftype == "Root Raised Cosine"):
            self.gui.filterTypeWidget.setCurrentWidget(self.gui.rrcPage)
        elif(ftype == "Gaussian"):
            self.gui.filterTypeWidget.setCurrentWidget(self.gui.gausPage)
        elif(ftype == "Half Band"):
            self.gui.filterTypeWidget.setCurrentWidget(self.gui.firhbPage)

#self.design()

    def changed_filter_design_type(self, design):
        if(design == "Equiripple"):
            self.set_equiripple()
        else:
            self.set_windowed()

#self.design()

    def set_equiripple(self):
        # Stop sending the signal for this function.
        self.gui.filterTypeComboBox.blockSignals(True)

        self.equiripple = True
        self.gui.lpfPassBandRippleLabel.setVisible(True)
        self.gui.lpfPassBandRippleEdit.setVisible(True)
        self.gui.bpfPassBandRippleLabel.setVisible(True)
        self.gui.bpfPassBandRippleEdit.setVisible(True)
        self.gui.bnfPassBandRippleLabel.setVisible(True)
        self.gui.bnfPassBandRippleEdit.setVisible(True)
        self.gui.hpfPassBandRippleLabel.setVisible(True)
        self.gui.hpfPassBandRippleEdit.setVisible(True)

        # Save current type and repopulate the combo box for
        # filters this window type can handle.
        currenttype = self.gui.filterTypeComboBox.currentText()
        items = self.gui.filterTypeComboBox.count()
        for i in range(items):
            self.gui.filterTypeComboBox.removeItem(0)
        self.gui.filterTypeComboBox.addItems(self.optFilters)

        # If the last filter type was valid for this window type,
        # go back to it; otherwise, reset.
        try:
            index = self.optFilters.index(currenttype)
            self.gui.filterTypeComboBox.setCurrentIndex(index)
        except ValueError:
            pass

        # Tell gui its ok to start sending this signal again.
        self.gui.filterTypeComboBox.blockSignals(False)

    def set_windowed(self):
        # Stop sending the signal for this function.
        self.gui.filterTypeComboBox.blockSignals(True)

        self.equiripple = False
        self.gui.lpfPassBandRippleLabel.setVisible(False)
        self.gui.lpfPassBandRippleEdit.setVisible(False)
        self.gui.bpfPassBandRippleLabel.setVisible(False)
        self.gui.bpfPassBandRippleEdit.setVisible(False)
        self.gui.bnfPassBandRippleLabel.setVisible(False)
        self.gui.bnfPassBandRippleEdit.setVisible(False)
        self.gui.hpfPassBandRippleLabel.setVisible(False)
        self.gui.hpfPassBandRippleEdit.setVisible(False)

        # Save current type and repopulate the combo box for
        # filters this window type can handle.
        currenttype = self.gui.filterTypeComboBox.currentText()
        items = self.gui.filterTypeComboBox.count()
        for i in range(items):
            self.gui.filterTypeComboBox.removeItem(0)
        
        self.gui.filterTypeComboBox.addItems(self.firFilters)

        # If the last filter type was valid for this window type,
        # go back to it; otherwise, reset.
        try:
            index = self.optFilters.index(currenttype)
            self.gui.filterTypeComboBox.setCurrentIndex(index)
        except ValueError:
            pass

        # Tell gui its ok to start sending this signal again.
        self.gui.filterTypeComboBox.blockSignals(False)

    def design(self):
        ret = True
        fs,r = getfloat(self.gui.sampleRateEdit.text())
        ret = r and ret
        gain,r = getfloat(self.gui.filterGainEdit.text())
        ret = r and ret

        winstr = self.gui.filterDesignTypeComboBox.currentText()
        ftype = self.gui.filterTypeComboBox.currentText()
        fsel = self.gui.fselectComboBox.currentText()

        if (fsel == "FIR"):
            self.b, self.a = [],[]
            if(ret):
                self.design_fir(ftype, fs, gain, winstr)
        elif (fsel.startswith("IIR")):
            with warnings.catch_warnings(record=True) as w:
                # Cause all warnings to always be triggered.
                warnings.simplefilter("always")
                self.design_iir()
                if len(w):
                    reply = QtGui.QMessageBox.information(self, "BadCoefficients",
                                                          str(w[-1].message),
                                                          QtGui.QMessageBox.Ok)

    # Do FIR design.
    def design_fir(self, ftype, fs, gain, winstr):
        self.iir = False
        self.cpicker.set_iir(False)
        self.cpicker2.set_iir(False)
        if(winstr == "Equiripple"):
            designer = {"Low Pass" : design_opt_lpf,
                        "Band Pass" : design_opt_bpf,
                        "Complex Band Pass" : design_opt_cbpf,
                        "Band Notch" : design_opt_bnf,
                        "Half Band" : design_opt_hb,
                        "High Pass" :  design_opt_hpf}
            taps,params,r = designer[ftype](fs, gain, self)

        else:
            designer = {"Low Pass" : design_win_lpf,
                        "Band Pass" : design_win_bpf,
                        "Complex Band Pass" : design_win_cbpf,
                        "Band Notch" : design_win_bnf,
                        "High Pass" :  design_win_hpf,
                        "Half Band" : design_win_hb,
                        "Root Raised Cosine" :  design_win_rrc,
                        "Gaussian" :  design_win_gaus}
            wintype = int(self.filterWindows[winstr])
            taps,params,r = designer[ftype](fs, gain, wintype, self)
        if(r):
            if self.gridview:
                self.params = params
                self.update_fft(taps, params)
                self.set_mfmagresponse()
                self.set_mttaps()
                self.gui.nTapsEdit.setText(str(self.taps.size))
            else:
                self.draw_plots(taps,params)
        zeros = self.get_zeros()
        poles = self.get_poles()
        self.gui.pzPlot.insertZeros(zeros)
        self.gui.pzPlot.insertPoles(poles)
        self.gui.mpzPlot.insertZeros(zeros)
        self.gui.mpzPlot.insertPoles(poles)
        self.update_fcoeff()
        self.gui.action_save.setEnabled(True)
        # self.set_drawideal()
        # Return taps if callback is enabled.
        if self.callback:
            retobj = ApiObject()
            retobj.update_all("fir", self.params, self.taps, 1)
            self.callback(retobj)

    # Do IIR design.
    def design_iir(self):
        iirftype = self.gui.iirfilterTypeComboBox.currentText()
        iirbtype = self.gui.iirfilterBandComboBox.currentText()
        atype = self.gui.adComboBox.currentText()
        self.taps = []
        self.iir = True
        ret = True
        params = []
        besselparams = []
        self.cpicker.set_iir(True)
        self.cpicker2.set_iir(True)

        iirft =     {"Elliptic" : 'ellip',
                     "Butterworth" : 'butter',
                     "Chebyshev-1" : 'cheby1',
                     "Chebyshev-2" : 'cheby2',
                     "Bessel" : 'bessel'  }

        sanalog =     {"Analog (rad/second)" : 1,
                       "Digital (normalized 0-1)" : 0  }

        paramtype = { 1 : "analog",
                      0 : "digital" }
        iirabbr = {
            "Low Pass" : "lpf",
            "High Pass" : "hpf",
            "Band Pass" : "bpf",
            "Band Stop" : "bnf"  }

        iirboxes = {"Low Pass" : [float(self.gui.iirendofLpfPassBandEdit.text()),
                                  float(self.gui.iirstartofLpfStopBandEdit.text()),
                                  float(self.gui.iirLpfPassBandAttenEdit.text()),
                                  float(self.gui.iirLpfStopBandRippleEdit.text())],

                    "High Pass" : [float(self.gui.iirstartofHpfPassBandEdit.text()),
                                   float(self.gui.iirendofHpfStopBandEdit.text()),
                                   float(self.gui.iirHpfPassBandAttenEdit.text()),
                                   float(self.gui.iirHpfStopBandRippleEdit.text())],

                    "Band Pass" : [float(self.gui.iirstartofBpfPassBandEdit.text()),
                                   float(self.gui.iirendofBpfPassBandEdit.text()),
                                   float(self.gui.iirendofBpfStopBandEdit1.text()),
                                   float(self.gui.iirstartofBpfStopBandEdit2.text()),
                                   float(self.gui.iirBpfPassBandAttenEdit.text()),
                                   float(self.gui.iirBpfStopBandRippleEdit.text())],

                    "Band Stop" : [float(self.gui.iirendofBsfPassBandEdit1.text()),
                                   float(self.gui.iirstartofBsfPassBandEdit2.text()),
                                   float(self.gui.iirstartofBsfStopBandEdit.text()),
                                   float(self.gui.iirendofBsfStopBandEdit.text()),
                                   float(self.gui.iirBsfPassBandAttenEdit.text()),
                                   float(self.gui.iirBsfStopBandRippleEdit.text())]  }
        # Remove Ideal band-diagrams if IIR.
        # self.set_drawideal()

        for i in range(len(iirboxes[iirbtype])):
            params.append(iirboxes[iirbtype][i])

        if len(iirboxes[iirbtype]) == 6:
            params = [params[:2],params[2:4],params[4],params[5]]

        if(iirftype == "Bessel"):
            if iirbtype == "Low Pass" or iirbtype == "High Pass":
                besselparams.append(float(self.gui.iirbesselcritEdit1.text()))
            else:
                besselparams.append(float(self.gui.iirbesselcritEdit1.text()))
                besselparams.append(float(self.gui.iirbesselcritEdit2.text()))

            order = int(self.gui.besselordEdit.text())

            try:
                (self.b, self.a) = signal.iirfilter(order, besselparams, btype=iirbtype.replace(' ', '').lower(),
                                                    analog=sanalog[atype], ftype=iirft[iirftype], output='ba')
            except Exception as e:
                reply = QtGui.QMessageBox.information(self, "IIR design error", e.args[0],
                                                      QtGui.QMessageBox.Ok)

            (self.z, self.p, self.k) = signal.tf2zpk(self.b, self.a)

            iirparams = {"filttype": iirft[iirftype], "bandtype": iirabbr[iirbtype], "filtord": order,
                         "paramtype": paramtype[sanalog[atype]], "critfreq": besselparams}
        else:
            try:
                (self.b, self.a) = signal.iirdesign(params[0], params[1], params[2], params[3],
                                                    analog=sanalog[atype], ftype=iirft[iirftype], output='ba')
            except Exception as e:
                reply = QtGui.QMessageBox.information(self, "IIR design error", e.args[0],
                                                      QtGui.QMessageBox.Ok)

            (self.z, self.p, self.k) = signal.tf2zpk(self.b, self.a)
            # Create parameters.
            iirparams = {"filttype": iirft[iirftype], "bandtype": iirabbr[iirbtype],
                         "paramtype": paramtype[sanalog[atype]], "pbedge": params[0], "sbedge": params[1],
                         "gpass": params[2], "gstop": params[3]}

        self.gui.pzPlot.insertZeros(self.z)
        self.gui.pzPlot.insertPoles(self.p)
        self.gui.mpzPlot.insertZeros(self.z)
        self.gui.mpzPlot.insertPoles(self.p)
        self.iir_plot_all(self.z, self.p, self.k)
        self.update_fcoeff()
        self.gui.nTapsEdit.setText("-")
        self.params = iirparams
        self.gui.action_save.setEnabled(True)
        # Return api_object if callback is enabled.
        if self.callback:
            retobj = ApiObject()
            retobj.update_all("iir", self.params, (self.b, self.a), 1)
            self.callback(retobj)

    # IIR Filter design plot updates.
    def iir_plot_all(self,z,p,k):
        self.b,self.a = signal.zpk2tf(z,p,k)
        w,h = signal.freqz(self.b,self.a)
        self.fftdB = 20 * np.log10 (abs(h))
        self.freq = w / max(w)
        self.fftDeg = np.unwrap(np.arctan2(np.imag(h),np.real(h)))
        self.groupDelay = -np.diff(self.fftDeg)
        self.phaseDelay = -self.fftDeg[1:] / self.freq[1:]
        if self.gridview:
            self.set_mfmagresponse()
            self.set_mtimpulse()
        else:
            self.update_freq_curves()
            self.update_phase_curves()
            self.update_group_curves()
            self.update_pdelay_curves()
            self.update_step_curves()
            self.update_imp_curves()


    def nfft_edit_changed(self, nfft):
        infft,r = getint(nfft)
        if(r and (infft != self.nfftpts)):
            self.nfftpts = infft
            self.update_freq_curves()

#    def tab_changed(self, tab):
#        if(tab == 0):
#            self.update_freq_curves()
#        if(tab == 1):
#            self.update_time_curves()
#        if(tab == 2):
#            self.update_phase_curves()
#        if(tab == 3):
#            self.update_group_curves()

    def get_fft(self, fs, taps, Npts):
        fftpts = fft_detail.fft(taps, Npts)
        self.freq = np.linspace(start=0, stop=fs, num=Npts, endpoint=False)
        with warnings.catch_warnings(record=True) as w:
            warnings.simplefilter("always")
            self.fftdB = 20.0*np.log10(abs(fftpts))
            if any(self.fftdB == float('-inf')):
                sys.stderr.write('Filter design failed (taking log10 of 0).\n')
                self.fftdB = np.zeros([len(fftpts)])

        self.fftDeg = np.unwrap(np.angle(fftpts))
        self.groupDelay = -np.diff(self.fftDeg)
        self.phaseDelay = -self.fftDeg[1:] / self.freq[1:]

    def update_time_curves(self):
        ntaps = len(self.taps)

        if(ntaps < 1):
            return

        # Set Data.
        if(type(self.taps[0]) == scipy.complex128):
            self.rcurve.setData(np.arange(ntaps), self.taps.real)
            self.icurve.setData(np.arange(ntaps), self.taps.imag)
        else:
            self.rcurve.setData(np.arange(ntaps), self.taps)
            self.icurve.setData([],[]);

        if self.mttaps:
            if(type(self.taps[0]) == scipy.complex128):
                self.mtimecurve_stems.setData(np.repeat(np.arange(ntaps), 2),
                                                np.dstack((np.zeros(self.taps.real.shape[0], dtype=int),
                                                        self.taps.real)).flatten())

                self.mtimecurve.setData(np.arange(ntaps), self.taps.real)


                self.mtimecurve_i_stems.setData(np.repeat(np.arange(ntaps), 2),
                                                np.dstack((np.zeros(self.taps.imag.shape[0], dtype=int),
                                                            self.taps.imag)).flatten())

                self.mtimecurve_i.setData(np.arange(ntaps), self.taps.imag)

            else:
                self.mtimecurve.setData(np.arange(ntaps), self.taps)
                self.mtimecurve_stems.setData(np.repeat(np.arange(ntaps), 2),
                                                np.dstack((np.zeros(self.taps.shape[0], dtype=int),
                                                        self.taps)).flatten())

                self.mtimecurve_i_stems.setData([],[])
                self.mtimecurve_i.setData([],[])



        # Configure plots.
        if self.mtoverlay:
            self.mplots['mTIME'].setMouseEnabled(x=True, y=True)
        else:
            self.mplots['mTIME'].setMouseEnabled(x=False, y=False)
            self.mplots['mTIME'].showAxis('right', False)

        # Set plot limits and reset axis zoom.
        self.plot_auto_limit(self.plots['TIME'], xMin=0, xMax=ntaps)
        self.plot_auto_limit(self.mplots['mTIME'], xMin=0, xMax=ntaps)

    def update_step_curves(self):
        ntaps = len(self.taps)

        if((ntaps < 1) and (not self.iir)):
            return

        # Set Data.
        if self.iir:
            stepres = self.step_response(self.b,self.a)
            ntaps = 50
        else:
            stepres = self.step_response(self.taps)

        if(type(stepres[0]) == np.complex128):
            self.steprescurve_stems.setData(np.repeat(np.arange(ntaps), 2),
                                            np.dstack((np.zeros(stepres.real.shape[0], dtype=int),
                                                       stepres.real)).flatten())

            self.steprescurve.setData(np.arange(ntaps), stepres.real)


            self.steprescurve_i_stems.setData(np.repeat(np.arange(ntaps), 2),
                                              np.dstack((np.zeros(stepres.imag.shape[0], dtype=int),
                                                         stepres.imag)).flatten())

            self.steprescurve_i.setData(np.arange(ntaps), stepres.imag)
        else:
            self.steprescurve_stems.setData(np.repeat(np.arange(ntaps), 2),
                                            np.dstack((np.zeros(stepres.shape[0], dtype=int),
                                                       stepres)).flatten())

            self.steprescurve.setData(np.arange(ntaps), stepres)
            self.steprescurve_i_stems.setData([],[])
            self.steprescurve_i.setData([],[])

        if self.mtstep:
            if(type(stepres[0]) == np.complex128):
                self.mtimecurve_stems.setData(np.repeat(np.arange(ntaps), 2),
                                                np.dstack((np.zeros(stepres.real.shape[0], dtype=int),
                                                        stepres.real)).flatten())

                self.mtimecurve.setData(np.arange(ntaps), stepres.real)


                self.mtimecurve_i_stems.setData(np.repeat(np.arange(ntaps), 2),
                                                np.dstack((np.zeros(stepres.imag.shape[0], dtype=int),
                                                            stepres.imag)).flatten())

                self.mtimecurve_i.setData(np.arange(ntaps), stepres.imag)
            else:
                self.mtimecurve_stems.setData(np.repeat(np.arange(ntaps), 2),
                                                np.dstack((np.zeros(stepres.shape[0], dtype=int),
                                                        stepres)).flatten())

                self.mtimecurve.setData(np.arange(ntaps), stepres)
                self.mtimecurve_i_stems.setData([],[])
                self.mtimecurve_i.setData([],[])

        # Configure plots.
        if self.mtoverlay:
            self.mplots['mTIME'].setMouseEnabled(x=True, y=True)
        else:
            self.mplots['mTIME'].setMouseEnabled(x=False, y=False)
            self.mplots['mTIME'].showAxis('right', False)

        # Set plot limits and reset axis zoom.
        self.plot_auto_limit(self.plots['STEPRES'], xMin=0, xMax=ntaps)
        self.plot_auto_limit(self.mplots['mTIME'], xMin=0, xMax=ntaps)

    def update_imp_curves(self):
        ntaps = len(self.taps)

        if((ntaps < 1) and (not self.iir)):
            return

        # Set Data.
        if self.iir:
            impres = self.impulse_response(self.b, self.a)
            ntaps = 50
        else:
            impres = self.impulse_response(self.taps)

        if(type(impres[0]) == np.complex128):
            self.imprescurve_stems.setData(np.repeat(np.arange(ntaps), 2),
                                           np.dstack((np.zeros(impres.real.shape[0], dtype=int),
                                                      impres.real)).flatten())

            self.imprescurve.setData(np.arange(ntaps), impres.real)


            self.imprescurve_i_stems.setData(np.repeat(np.arange(ntaps), 2),
                                             np.dstack((np.zeros(impres.imag.shape[0], dtype=int),
                                                        impres.imag)).flatten())

            self.imprescurve_i.setData(np.arange(ntaps), impres.imag)
        else:
            self.imprescurve_stems.setData(np.repeat(np.arange(ntaps), 2),
                                           np.dstack((np.zeros(impres.shape[0], dtype=int),
                                                      impres)).flatten())

        if self.mtimpulse:
            if(type(impres[0]) == np.complex128):
                self.mtimecurve_stems.setData(np.repeat(np.arange(ntaps), 2),
                                            np.dstack((np.zeros(impres.real.shape[0], dtype=int),
                                                        impres.real)).flatten())

                self.mtimecurve.setData(np.arange(ntaps), impres.real)


                self.mtimecurve_i_stems.setData(np.repeat(np.arange(ntaps), 2),
                                                np.dstack((np.zeros(impres.imag.shape[0], dtype=int),
                                                            impres.imag)).flatten())

                self.mtimecurve_i.setData(np.arange(ntaps), impres.imag)
            else:
                self.mtimecurve_stems.setData(np.repeat(np.arange(ntaps), 2),
                                            np.dstack((np.zeros(impres.shape[0], dtype=int),
                                                        impres)).flatten())

                self.mtimecurve.setData(np.arange(ntaps), impres)
                self.mtimecurve_i_stems.setData([],[])
                self.mtimecurve_i.setData([],[])

        # Configure plots.
        if self.mtoverlay:
            self.mplots['mTIME'].setMouseEnabled(x=True, y=True)
        else:
            self.mplots['mTIME'].setMouseEnabled(x=False, y=False)
            self.mplots['mTIME'].showAxis('right', False)

        # Set plot limits and reset axis zoom.
        self.plot_auto_limit(self.plots['IMPRES'], xMin=0, xMax=ntaps)
        self.plot_auto_limit(self.mplots['mTIME'], xMin=0, xMax=ntaps)

    def plot_secondary(self):
        if (self.mfoverlay):
            if self.last_mfreq_plot == "freq":
                self.mfmagresponse = True
                self.update_freq_curves(True)
            elif self.last_mfreq_plot == "phase":
                self.mfphaseresponse = True
                self.update_phase_curves(True)
            elif self.last_mfreq_plot == "group":
                self.mfgroupdelay = True
                self.update_group_curves(True)
            elif self.last_mfreq_plot == "pdelay":
                self.mfphasedelay = True
                self.update_pdelay_curves(True)

            self.mplots['mFREQ'].showAxis('right', True)  
        else:
            self.mplots['mFREQ'].setMouseEnabled(x=False, y=False)
            self.mplots['mFREQ'].showAxis('right', False) 
            self.mfreqcurve2.setData([],[])  

    def update_freq_curves(self, secondary=False):
        npts = len(self.fftdB)

        if(npts < 1):
            return

        # Set Data.
        if self.iir:
            self.freqcurve.setData(self.freq[:npts-1], self.fftdB[:npts-1])
        else:
            self.freqcurve.setData(self.freq[:int(npts//2)], self.fftdB[:int(npts//2)])

        if self.mfmagresponse:
            curve = self.mfreqcurve
            if secondary: 
                curve = self.mfreqcurve2

            if self.iir:
                curve.setData(self.freq[:npts-1], self.fftdB[:npts-1])
            else:
                curve.setData(self.freq[:int(npts//2)], self.fftdB[:int(npts//2)])


        # Set axes to new scales.

        # Set plot limits and reset axis zoom.
        if self.iir:
            xmax = self.freq[npts-1]
        else:
            xmax = self.freq[npts//2]

        xmin = self.freq[0]

        self.plot_auto_limit(self.plots['FREQ'], xMin=xmin, xMax=xmax)
        self.plot_auto_limit(self.mplots['mFREQ'], xMin=xmin, xMax=xmax)

        if secondary:
            self.mplots['mFREQ'].setLabel('right', 'Magnitude', units='dB', **self.labelstyle9b)
        else:
            self.mplots['mFREQ'].setLabel('left', 'Magnitude', units='dB', **self.labelstyle9b)

        if not secondary:
            self.plot_secondary()
            self.last_mfreq_plot = 'freq'


    def update_phase_curves(self, secondary=False):
        npts = len(self.fftDeg)

        if(npts < 1):
            return

        # Set Data.
        if self.iir:
            self.phasecurve.setData(self.freq[:npts-1], self.fftDeg[:npts-1])
        else:
            self.phasecurve.setData(self.freq[:int(npts//2)], self.fftDeg[:int(npts//2)])

        if self.mfphaseresponse:
            curve = self.mfreqcurve
            if secondary: 
                curve = self.mfreqcurve2

            if self.iir:
                curve.setData(self.freq[:npts-1], self.fftDeg[:npts-1])
            else:
                curve.setData(self.freq[:int(npts//2)], self.fftDeg[:int(npts//2)])



        # Set plot limits and reset axis zoom.
        if self.iir:
            xmax = self.freq[npts-1]
        else:
            xmax = self.freq[npts//2]

        xmin = self.freq[0]

        self.plot_auto_limit(self.plots['PHASE'], xMin=xmin, xMax=xmax)
        self.plot_auto_limit(self.mplots['mFREQ'], xMin=xmin, xMax=xmax)

        # Set Axis title.
        if secondary:
            self.mplots['mFREQ'].setLabel('right', 'Phase', units='Radians', **self.labelstyle9b)
        else:
            self.mplots['mFREQ'].setLabel('left', 'Phase', units='Radians', **self.labelstyle9b)


        if not secondary:
            self.plot_secondary()
            self.last_mfreq_plot = 'phase'

    def update_group_curves(self, secondary=False):
        npts = len(self.groupDelay)

        if(npts < 1):
            return

        # Set Data.
        if self.iir:
            self.groupcurve.setData(self.freq[:npts-1], self.groupDelay[:npts-1])
        else:
            self.groupcurve.setData(self.freq[:int(npts//2)], self.groupDelay[:int(npts//2)])

        if self.mfgroupdelay:
            curve = self.mfreqcurve
            if secondary: 
                curve = self.mfreqcurve2

            if self.iir:
                curve.setData(self.freq[:npts-1], self.groupDelay[:npts-1])
            else:
                curve.setData(self.freq[:int(npts//2)], self.groupDelay[:int(npts//2)])


        # Configure plots.
        if self.mtoverlay:
            self.mplots['mFREQ'].setMouseEnabled(x=True, y=True)
        else:
            self.mplots['mFREQ'].setMouseEnabled(x=False, y=False)
            self.mplots['mFREQ'].showAxis('right', False)

        # Set plot limits and reset axis zoom.
        if self.iir:
            xmax = self.freq[npts-1]
        else:
            xmax = self.freq[npts//2]

        xmin = self.freq[0]

        self.plot_auto_limit(self.plots['GROUP'], xMin=xmin, xMax=xmax)
        self.plot_auto_limit(self.mplots['mFREQ'], xMin=xmin, xMax=xmax)

        # Set Axis title.
        if secondary:
            self.mplots['mFREQ'].setLabel('right', 'Delay', units='seconds', **self.labelstyle9b)
        else:
            self.mplots['mFREQ'].setLabel('left', 'Delay', units='seconds', **self.labelstyle9b)



        if not secondary:
            self.plot_secondary()
            self.last_mfreq_plot = 'group'

    def update_pdelay_curves(self, secondary=False):
        npts = len(self.phaseDelay)

        if(npts < 1):
            return

        # Set Data.
        if self.iir:
            self.pdelaycurve.setData(self.freq[:npts-1], self.phaseDelay[:npts-1])
        else:
            self.pdelaycurve.setData(self.freq[:int(npts//2)], self.phaseDelay[:int(npts//2)])
        
        if self.mfphasedelay:
            curve = self.mfreqcurve
            if secondary: 
                curve = self.mfreqcurve2
            if self.iir:
                curve.setData(self.freq[:npts-1], self.phaseDelay[:npts-1])
            else:
                curve.setData(self.freq[:int(npts//2)], self.phaseDelay[:int(npts//2)])


        # Set plot limits and reset axis zoom.
        if self.iir:
            xmax = self.freq[npts-1]
        else:
            xmax = self.freq[npts//2]

        xmin = self.freq[0]

        self.plot_auto_limit(self.plots['PDELAY'], xMin=xmin, xMax=xmax)
        self.plot_auto_limit(self.mplots['mFREQ'], xMin=xmin, xMax=xmax)

        # Set Axis title.
        if secondary:
            self.mplots['mFREQ'].setLabel('right', 'Phase Delay', **self.labelstyle9b)
        else:
            self.mplots['mFREQ'].setLabel('left', 'Phase Delay',  **self.labelstyle9b)

        if not secondary:
            self.plot_secondary()
            self.last_mfreq_plot = 'pdelay'

    def plot_auto_limit(self, plot, xMin=None, xMax=None, yMin=None, yMax=None):
        plot.setLimits(xMin=None, xMax=None, yMin=None, yMax=None)
        plot.autoRange()
        view = plot.viewRange()
        xmin = view[0][0] if xMin is None else xMin
        xmax = view[0][1] if xMax is None else xMax
        ymin = view[1][0] if yMin is None else yMin
        ymax = view[1][1] if yMax is None else yMax
        plot.setLimits(xMin=xmin, xMax=xmax, yMin=ymin, yMax=ymax)

    def action_quick_access(self):
        # Hides quick access widget if unselected.
        if (self.gui.quickFrame.isHidden()):
            self.gui.quickFrame.show()
        else:
            self.gui.quickFrame.hide()

    def action_spec_widget(self):
        # Hides spec widget if unselected.
        if (self.gui.filterspecView.isHidden()):
            self.gui.filterspecView.show()
        else:
            self.gui.filterspecView.hide()

    def action_response_widget(self):
        if (self.gui.tabGroup.isHidden()):
            self.gui.tabGroup.show()
        else:
            self.gui.tabGroup.hide()

    def action_design_widget(self):
        # Hides design widget if unselected.
        if (self.gui.filterFrame.isHidden()):
            self.gui.filterFrame.show()
        else:
            self.gui.filterFrame.hide()

    # Saves and attach the plots for comparison.
    def set_bufferplots(self):
        if (self.gui.checkKeepcur.checkState() == 0 ):
            # Detach and delete all plots if unchecked.
            for c in self.bufferplots:
                c.detach()
                self.replot_all()
                self.bufferplots = []
        else:
            self.bufferplots = []
            # Iterate through tabgroup children and copy curves.
            for i in range(self.gui.tabGroup.count()):
                page = self.gui.tabGroup.widget(i)
                for item in page.children():
                    if isinstance(item, Qwt.QwtPlot):
                        # Change colours as both plots overlay.
                        colours = [QtCore.Qt.darkYellow,QtCore.Qt.black]
                        for c in item.itemList():
                            if isinstance(c, Qwt.QwtPlotCurve):
                                dup = Qwt.QwtPlotCurve()
                                dpen = c.pen()
                                dsym = c.symbol()
                                dsym.setPen(Qt.QPen(colours[0]))
                                dsym.setSize(Qt.QSize(6, 6))
                                dpen.setColor(colours[0])
                                del colours[0]
                                dup.setPen(dpen)
                                dup.setSymbol(dsym)
                                dup.setRenderHint(Qwt.QwtPlotItem.RenderAntialiased)
                                dup.setData([c.x(i) for i in range(c.dataSize())],
                                            [c.y(i) for i in range(c.dataSize())])
                                self.bufferplots.append(dup)
                                self.bufferplots[-1].attach(item)

    def set_grid(self):
        if (self.gui.checkGrid.checkState() == 0):
            self.gridenable = False

            for i in self.plots:
                self.plots[i].showGrid(x=False, y=False)

            for i in self.mplots:
                self.mplots[i].showGrid(x=False, y=False)
        else:
            self.gridenable = True
            if self.gridview:
                for i in self.mplots:
                    self.mplots[i].showGrid(x=True, y=True)
            else:
                for i in self.plots:
                    self.plots[i].showGrid(x=True, y=True)

    def set_actgrid(self):
        if (self.gui.actionGrid_2.isChecked() == 0 ):
            self.gridenable = False

            for i in self.plots:
                self.plots[i].showGrid(x=False, y=False)

            for i in self.mplots:
                self.mplots[i].showGrid(x=False, y=False)
        else:
            self.gridenable = True
            if self.gridview:
                for i in self.mplots:
                    self.mplots[i].showGrid(x=True, y=True)
            else:
                for i in self.plots:
                    self.plots[i].showGrid(x=True, y=True)

    def set_magresponse(self):
        if (self.gui.checkMagres.checkState() == 0 ):
            self.magres = False
            self.gui.tabGroup.removeTab(self.gui.tabGroup.indexOf(self.gui.freqTab))
        else:
            self.magres = True
            self.gui.tabGroup.addTab(self.gui.freqTab, _fromUtf8("Magnitude Response"))
            self.update_freq_curves()

    def set_actmagresponse(self):
        if (self.gui.actionMagnitude_Response.isChecked() == 0 ):
            self.gui.tabGroup.removeTab(self.gui.tabGroup.indexOf(self.gui.freqTab))
        else:
            self.gui.tabGroup.addTab(self.gui.freqTab, _fromUtf8("Magnitude Response"))
            self.update_freq_curves()

    def set_switchview(self):
        if (self.gui.actionGridview.isChecked() == 0 ):
            self.gridview = 0
            self.set_defaultpen()
            self.set_actgrid()
            self.gui.stackedWindows.setCurrentIndex(0)
            if self.iir:
                self.iir_plot_all(self.z,self.p,self.k)
            else:
                self.draw_plots(self.taps,self.params)
        else:
            self.gridview = 1
            self.set_actgrid()
            self.gui.stackedWindows.setCurrentIndex(1)
            self.update_freq_curves()
            self.update_time_curves()
            # self.set_drawideal()

    def set_plotselect(self):
        if (self.gui.actionPlot_select.isChecked() == 0 ):
            self.gui.mfgroupBox.hide()
            self.gui.mtgroupBox.hide()
            self.gui.pzgroupBox.hide()
            self.gui.mpzgroupBox.hide()
        else:
            self.gui.mfgroupBox.show()
            self.gui.mtgroupBox.show()
            self.gui.pzgroupBox.show()
            self.gui.mpzgroupBox.show()

    def replot_all(self):
        self.plots['TIME'].replot()
        self.mplots['mTIME'].replot()
        self.plots['FREQ'].replot()
        self.mplots['mFREQ'].replot()
        self.plots['PHASE'].replot()
        self.plots['GROUP'].replot()
        self.plots['IMPRES'].replot()
        self.plots['STEPRES'].replot()
        self.plots['PDELAY'].replot()

    def detach_allgrid(self):
        for i in self.plots:
            i.showGrid(x=False, y=False)

    def set_mfmagresponse(self):
        if self.mfoverlay:
            self.mfmagresponse = True
        else:
            self.mfmagresponse = not(self.mfmagresponse)
        # if not self.mfoverlay:
        self.mfphasedelay = False
        self.mfgroupdelay = False
        self.mfphaseresponse = False


        self.update_freq_curves()

    def set_mfphaseresponse(self):
        if self.mfoverlay:
            self.mfphaseresponse = True
        else:
            self.mfphaseresponse = not(self.mfphaseresponse)
        # if not self.mfoverlay:
        self.mfphasedelay = False
        self.mfgroupdelay = False
        self.mfmagresponse = False

        self.update_phase_curves()

    def set_mfgroupdelay(self):
        if self.mfoverlay:
            self.mfgroupdelay = True
        else:
            self.mfgroupdelay = not(self.mfgroupdelay)
        # if not self.mfoverlay:
        self.mfphasedelay = False
        self.mfphaseresponse = False
        self.mfmagresponse = False

        self.update_group_curves()

    def set_mfphasedelay(self):
        if self.mfoverlay:
            self.mfphasedelay = True
        else:
            self.mfphasedelay = not(self.mfphasedelay)

        # if not self.mfoverlay:
        self.mfgroupdelay = False
        self.mfphaseresponse = False
        self.mfmagresponse = False

        self.update_pdelay_curves()

    def ifinlist(self,a,dlist):
        for d in dlist:
            if self.compare_instances(a,d):
                return True
        return False

    def compare_instances(self,a,b):
        if a is b:
            return True
        else:
            return False

    def detach_firstattached(self, plot):
        items = plot.itemList()
        plot.enableAxis(Qwt.QwtPlot.yRight)
        if len(items) > 2:
            yaxis=items[0].yAxis()
            items[2].setPen(items[0].pen())
            items[2].setYAxis(yaxis)
            items[0].detach()
        else:
            items[1].setYAxis(Qwt.QwtPlot.yRight)
            if plot is self.mplots['mFREQ']:
                items[1].setPen(QtGui.QPen(QtCore.Qt.red, 1, QtCore.Qt.SolidLine))
                self.set_actgrid()


    def update_fft(self, taps, params):
        self.params = params
        self.taps = np.array(taps)
        self.get_fft(self.params["fs"], self.taps, self.nfftpts)

    def set_mfoverlay(self):
        self.mfoverlay = not(self.mfoverlay)

    def set_conj(self):
        self.cpicker.set_conjugate()

    def set_mconj(self):
        self.cpicker2.set_conjugate()

    def set_zeroadd(self):
        self.cpicker.add_zero()

    def set_mzeroadd(self):
        self.cpicker2.add_zero()

    def set_poleadd(self):
        self.cpicker.add_pole()

    def set_mpoleadd(self):
        self.cpicker2.add_pole()

    def set_delpz(self):
        self.cpicker.delete_pz()

    def set_mdelpz(self):
        self.cpicker2.delete_pz()

    def set_mttaps(self):

        self.mttaps = not(self.mttaps)
        if not self.mfoverlay:
            self.mtstep = False
            self.mtimpulse = False

        self.update_time_curves()

    def set_mtstep(self):

        self.mtstep = not(self.mtstep)
        if not self.mfoverlay:
            self.mttaps = False
            self.mtimpulse = False

        self.update_step_curves()

    def set_mtimpulse(self):

        self.mtimpulse = not(self.mtimpulse)
        if not self.mfoverlay:
            self.mttaps = False
            self.mtstep = False


        self.update_imp_curves()
        

    def set_gdelay(self):
        if (self.gui.checkGdelay.checkState() == 0 ):
            self.gui.tabGroup.removeTab(self.gui.tabGroup.indexOf(self.gui.groupTab))
        else:
            self.gui.tabGroup.addTab(self.gui.groupTab, _fromUtf8("Group Delay"))
            self.update_freq_curves()

    def set_actgdelay(self):
        if (self.gui.actionGroup_Delay.isChecked() == 0 ):
            self.gui.tabGroup.removeTab(self.gui.tabGroup.indexOf(self.gui.groupTab))
        else:
            self.gui.tabGroup.addTab(self.gui.groupTab, _fromUtf8("Group Delay"))
            self.update_freq_curves()

    def set_phase(self):
        if (self.gui.checkPhase.checkState() == 0 ):
            self.gui.tabGroup.removeTab(self.gui.tabGroup.indexOf(self.gui.phaseTab))
        else:
            self.gui.tabGroup.addTab(self.gui.phaseTab, _fromUtf8("Phase Response"))
            self.update_freq_curves()

    def set_actphase(self):
        if (self.gui.actionPhase_Respone.isChecked() == 0 ):
            self.gui.tabGroup.removeTab(self.gui.tabGroup.indexOf(self.gui.phaseTab))
        else:
            self.gui.tabGroup.addTab(self.gui.phaseTab, _fromUtf8("Phase Response"))
            self.update_freq_curves()

    def set_fcoeff(self):
        if (self.gui.checkFcoeff.checkState() == 0 ):
            self.gui.tabGroup.removeTab(self.gui.tabGroup.indexOf(self.gui.fcTab))
        else:
            self.gui.tabGroup.addTab(self.gui.fcTab, _fromUtf8("Filter Coefficients"))
            self.update_fcoeff()

    def set_actfcoeff(self):
        if (self.gui.actionFilter_Coefficients.isChecked() == 0 ):
            self.gui.tabGroup.removeTab(self.gui.tabGroup.indexOf(self.gui.fcTab))
        else:
            self.gui.tabGroup.addTab(self.gui.fcTab, _fromUtf8("Filter Coefficients"))
            self.update_fcoeff()

    def set_band(self):
        if (self.gui.checkBand.checkState() == 0 ):
            self.gui.filterspecView.removeTab(self.gui.filterspecView.indexOf(self.gui.bandDiagram))
        else:
            self.gui.filterspecView.addTab(self.gui.bandDiagram, _fromUtf8("Band Diagram"))

    def set_actband(self):
        if (self.gui.actionBand_Diagram.isChecked() == 0 ):
            self.gui.filterspecView.removeTab(self.gui.filterspecView.indexOf(self.gui.bandDiagram))
        else:
            self.gui.filterspecView.addTab(self.gui.bandDiagram, _fromUtf8("Band Diagram"))

    # def set_drawideal(self):
    #     fsel = self.gui.fselectComboBox.currentText()
    #     if self.gridview and not(self.mfoverlay):
    #         plot = self.mplots['mFREQ']
    #     else:
    #         plot = self.plots['FREQ']

    #     if (self.gui.actionIdeal_Band.isChecked() == 0 or fsel == "IIR(scipy)"):
    #         self.idbanditems.detach_allidealcurves(plot)
    #     elif(self.params):
    #         ftype = self.gui.filterTypeComboBox.currentText()
    #         self.idbanditems.attach_allidealcurves(plot)
    #         self.idbanditems.plotIdealCurves(ftype, self.params, plot)
    #         plot.replot()

    def set_pzplot(self):
        if (self.gui.checkPzplot.checkState() == 0 ):
            self.gui.filterspecView.removeTab(self.gui.filterspecView.indexOf(self.gui.poleZero))
        else:
            self.gui.filterspecView.addTab(self.gui.poleZero, _fromUtf8("Pole-Zero Plot"))

    def set_actpzplot(self):
        if (self.gui.actionPole_Zero_Plot_2.isChecked() == 0 ):
            self.gui.filterspecView.removeTab(self.gui.filterspecView.indexOf(self.gui.poleZero))
        else:
            self.gui.filterspecView.addTab(self.gui.poleZero, _fromUtf8("Pole-Zero Plot"))

    def set_pdelay(self):
        if (self.gui.checkPzplot.checkState() == 0 ):
            self.gui.tabGroup.removeTab(self.gui.tabGroup.indexOf(self.gui.pdelayTab))
        else:
            self.gui.tabGroup.addTab(self.gui.pdelayTab, _fromUtf8("Phase Delay"))

    def set_actpdelay(self):
        if (self.gui.actionPhase_Delay.isChecked() == 0 ):
            self.gui.tabGroup.removeTab(self.gui.tabGroup.indexOf(self.gui.pdelayTab))
        else:
            self.gui.tabGroup.addTab(self.gui.pdelayTab, _fromUtf8("Phase Delay"))

    def set_impres(self):
        if (self.gui.checkImpulse.checkState() == 0 ):
            self.gui.tabGroup.removeTab(self.gui.tabGroup.indexOf(self.gui.impresTab))
        else:
            self.gui.tabGroup.addTab(self.gui.impresTab, _fromUtf8("Impulse Response"))

    def set_actimpres(self):
        if (self.gui.actionImpulse_Response.isChecked() == 0 ):
            self.gui.tabGroup.removeTab(self.gui.tabGroup.indexOf(self.gui.impresTab))
        else:
            self.gui.tabGroup.addTab(self.gui.impresTab, _fromUtf8("Impulse Response"))

    def set_stepres(self):
        if (self.gui.checkStep.checkState() == 0 ):
            self.gui.tabGroup.removeTab(self.gui.tabGroup.indexOf(self.gui.stepresTab))
        else:
            self.gui.tabGroup.addTab(self.gui.stepresTab, _fromUtf8("Step Response"))

    def set_actstepres(self):
        if (self.gui.actionStep_Response.isChecked() == 0 ):
            self.gui.tabGroup.removeTab(self.gui.tabGroup.indexOf(self.gui.stepresTab))
        else:
            self.gui.tabGroup.addTab(self.gui.stepresTab, _fromUtf8("Step Response"))

    def populate_bandview(self,fitems):
        for item in fitems:
            if (item.isWidgetType()):
                self.scene.addWidget(item)
            else:
                self.scene.addItem(item)

    def remove_bandview(self):
        for item in list(self.scene.items()):
            self.scene.removeItem(item)

    def set_fatten(self,atten):
        ftype = self.gui.filterTypeComboBox.currentText()
        if (ftype == "Low Pass"):
            boxatten,r = getfloat(self.gui.lpfStopBandAttenEdit.text())
            self.gui.lpfStopBandAttenEdit.setText(str(atten+boxatten))

        if ftype == "High Pass":
            boxatten,r = getfloat(self.gui.hpfStopBandAttenEdit.text())
            self.gui.hpfStopBandAttenEdit.setText(str(atten+boxatten))

        if ftype == "Band Pass":
            boxatten,r = getfloat(self.gui.bpfStopBandAttenEdit.text())
            self.gui.bpfStopBandAttenEdit.setText(str(atten+boxatten))

        if ftype == "Band Notch":
            boxatten,r = getfloat(self.gui.bnfStopBandAttenEdit.text())
            self.gui.bnfStopBandAttenEdit.setText(str(atten+boxatten))

        if ftype == "Complex Band Pass":
            boxatten,r = getfloat(self.gui.bpfStopBandAttenEdit.text())
            self.gui.bpfStopBandAttenEdit.setText(str(atten+boxatten))

    def set_curvetaps(self, zeros_poles):
        zr, pl = zeros_poles
        if self.iir:
            self.z = zr
            self.p = pl
            self.iir_plot_all(self.z,self.p,self.k)
            self.gui.mpzPlot.insertZeros(zr)
            self.gui.mpzPlot.insertPoles(pl)
            self.update_fcoeff()
            if self.callback:
                retobj = ApiObject()
                retobj.update_all("iir", self.params, (self.b, self.a), 1)
                self.callback(retobj)
        else:
            hz = poly1d(zr,r=1)
            # print hz.c.
            self.taps = hz.c*self.taps[0]
            self.draw_plots(self.taps,self.params)
            self.update_fcoeff()
            # update the pzplot in other view.
            zeros = self.get_zeros()
            poles = self.get_poles()
            self.gui.mpzPlot.insertZeros(zeros)
            self.gui.mpzPlot.insertPoles(poles)
            self.gui.nTapsEdit.setText(str(self.taps.size))
            if self.callback:
                retobj = ApiObject()
                retobj.update_all("fir", self.params, self.taps, 1)
                self.callback(retobj)

    def set_mcurvetaps(self, zeros_poles):
        zr, pl = zeros_poles
        if self.iir:
            self.z = zr
            self.p = pl
            self.iir_plot_all(self.z,self.p,self.k)
            self.gui.pzPlot.insertZeros(zr)
            self.gui.pzPlot.insertPoles(pl)
            self.update_fcoeff()
            if self.callback:
                retobj = ApiObject()
                retobj.update_all("iir", self.params, (self.b, self.a), 1)
                self.callback(retobj)
        else:
            hz = poly1d(zr,r=1)
            # print hz.c.
            self.taps = hz.c*self.taps[0]
            if self.gridview:
                self.update_fft(self.taps, self.params)
                self.set_mfmagresponse()
                self.set_mttaps()
            else:
                self.draw_plots(self.taps,self.params)
            self.update_fcoeff()
            # update the pzplot in other view.
            zeros = self.get_zeros()
            poles = self.get_poles()
            self.gui.pzPlot.insertZeros(zeros)
            self.gui.pzPlot.insertPoles(poles)
            self.gui.nTapsEdit.setText(str(self.taps.size))
            if self.callback:
                retobj = ApiObject()
                retobj.update_all("fir", self.params, self.taps, 1)
                self.callback(retobj)

    def set_statusbar(self, point):
        x, y = point
        if x == None:
            self.gui.pzstatusBar.showMessage("")
        else:
            self.gui.pzstatusBar.showMessage("X: "+str(x)+"  Y: "+str(y))

    def set_mstatusbar(self, point):
        x, y = point
        if x == None:
            self.gui.mpzstatusBar.showMessage("")
        else:
            self.gui.mpzstatusBar.showMessage("X: "+str(x)+"  Y: "+str(y))

    def get_zeros(self):
        hz = poly1d(self.taps,r=0)
        return hz.r

    def get_poles(self):
        if len(self.taps):
            hp = zeros(len(self.taps)-1,complex)
            return hp
        else:
            return []

    def impulse_response(self, b, a=1):
        length = len(b)
        if self.iir:
            length = 50
        impulse = np.repeat(0., length)
        impulse[0] = 1.
        x = np.arange(0, length)
        response = signal.lfilter(b, a, impulse)
        return response

    def step_response(self, b, a=1):
        length = len(b)
        if self.iir:
            length = 50
        impulse = np.repeat(0., length)
        impulse[0] = 1.
        x = np.arange(0, length)
        response = signal.lfilter(b, a, impulse)
        step = np.cumsum(response)
        return step

    def update_fcoeff(self):
        fcoeff=""
        if self.iir:
            fcoeff="b = " + ','.join(str(e) for e in self.b) +"\na = " + ','.join(str(e) for e in self.a)
        else:
            fcoeff="taps = " + ','.join(str(e) for e in self.taps)

        self.gui.filterCoeff.setText(fcoeff)
        self.gui.mfilterCoeff.setText(fcoeff)

    def action_save_dialog(self):
        file_dialog_output = QtGui.QFileDialog.getSaveFileName(self, "Save CSV Filter File", ".", "")
        filename = file_dialog_output[0]
        try:
            handle = open(filename, "w")
        except IOError:
            reply = QtGui.QMessageBox.information(self, 'File Name',
                                                  ("Could not save to file: %s" % filename),
                                                  QtGui.QMessageBox.Ok)
            return

        csvhandle = csv.writer(handle, delimiter=",")
        # Indicate FIR/IIR for easy reading.
        if self.iir:
            csvhandle.writerow(["restype","iir"])
        else:
            csvhandle.writerow(["restype","fir"])

        for k in list(self.params.keys()):
            csvhandle.writerow([k, self.params[k]])
        if self.iir:
            csvhandle.writerow(["b",] + list(self.b))
            csvhandle.writerow(["a",] + list(self.a))
        else:
            csvhandle.writerow(["taps",] + list(self.taps))
        handle.close()
        self.gui.action_save.setEnabled(False)
        # Iterate through all plots and delete the curves
        for window in self.plots.values():
            window.drop_plotdata()
        # Clear filter coeffs
        self.gui.filterCoeff.setText("")
        self.gui.mfilterCoeff.setText("")
        # Clear poles and zeros plot
        self.gui.pzPlot.clear()
        self.replot_all()

    def action_open_dialog(self):
        file_dialog_output = QtGui.QFileDialog.getOpenFileName(self, "Open CSV Filter File", ".", "")
        if(len(file_dialog_output) == 0):
            return
        # file_dialog_output returns tuple of (filename, file filter)
        filename = file_dialog_output[0]
        try:
            handle = open(filename, "r")
        except IOError:
            reply = QtGui.QMessageBox.information(self, 'File Name',
                                                  ("Could not open file: %s" % filename),
                                                  QtGui.QMessageBox.Ok)
            return

        csvhandle = csv.reader(handle, delimiter=",")
        b_a={}
        taps = []
        params = {}
        for row in csvhandle:
            if (row[0] == "restype"):
                restype = row[1]
            elif(row[0] == "taps"):
                testcpx = re.findall(r"[+-]?\d+\.*\d*[Ee]?[-+]?\d+j", row[1])
                if(len(testcpx) > 0): # it's a complex
                    taps = [complex(r) for r in row[1:]]
                else:
                    taps = [float(r) for r in row[1:]]
            elif(row[0] == "b" or row[0] == "a"):
                testcpx = re.findall(r"[+-]?\d+\.*\d*[Ee]?[-+]?\d+j", row[1])
                if(len(testcpx) > 0): # it's a complex
                    b_a[row[0]] = [complex(r) for r in row[1:]]
                else:
                    b_a[row[0]]= [float(r) for r in row[1:]]
            else:
                testcpx = re.findall(r"[+-]?\d+\.*\d*[Ee]?[-+]?\d+j", row[1])
                if(len(testcpx) > 0): # it's a complex
                    params[row[0]] = complex(row[1])
                else: # assume it's a float.
                    try: # if it's not a float, its a string.
                        params[row[0]] = float(row[1])
                    except ValueError:
                        params[row[0]] = row[1]

        handle.close()

        if restype == "fir":
            self.iir = False
            self.gui.fselectComboBox.setCurrentIndex(0)
            self.draw_plots(taps, params)
            zeros = self.get_zeros()
            poles = self.get_poles()
            self.gui.pzPlot.insertZeros(zeros)
            self.gui.pzPlot.insertPoles(poles)
            self.gui.mpzPlot.insertZeros(zeros)
            self.gui.mpzPlot.insertPoles(poles)

            self.gui.sampleRateEdit.setText(str(params["fs"]))
            self.gui.filterGainEdit.setText(str(params["gain"]))

            # Set up GUI parameters for each filter type.
            if(params["filttype"] == "lpf"):
                self.gui.filterTypeComboBox.setCurrentIndex(0)
                self.gui.filterDesignTypeComboBox.setCurrentIndex(int(params["wintype"]))

                self.gui.endofLpfPassBandEdit.setText(str(params["pbend"]))
                self.gui.startofLpfStopBandEdit.setText(str(params["sbstart"]))
                self.gui.lpfStopBandAttenEdit.setText(str(params["atten"]))
                if(params["wintype"] == self.EQUIRIPPLE_FILT):
                    self.gui.lpfPassBandRippleEdit.setText(str(params["ripple"]))
            elif(params["filttype"] == "bpf"):
                self.gui.filterTypeComboBox.setCurrentIndex(1)
                self.gui.filterDesignTypeComboBox.setCurrentIndex(int(params["wintype"]))

                self.gui.startofBpfPassBandEdit.setText(str(params["pbstart"]))
                self.gui.endofBpfPassBandEdit.setText(str(params["pbend"]))
                self.gui.bpfTransitionEdit.setText(str(params["tb"]))
                self.gui.bpfStopBandAttenEdit.setText(str(params["atten"]))
                if(params["wintype"] == self.EQUIRIPPLE_FILT):
                    self.gui.bpfPassBandRippleEdit.setText(str(params["ripple"]))
            elif(params["filttype"] == "cbpf"):
                self.gui.filterTypeComboBox.setCurrentIndex(2)
                self.gui.filterDesignTypeComboBox.setCurrentIndex(int(params["wintype"]))

                self.gui.startofBpfPassBandEdit.setText(str(params["pbstart"]))
                self.gui.endofBpfPassBandEdit.setText(str(params["pbend"]))
                self.gui.bpfTransitionEdit.setText(str(params["tb"]))
                self.gui.bpfStopBandAttenEdit.setText(str(params["atten"]))
                if(params["wintype"] == self.EQUIRIPPLE_FILT):
                    self.gui.bpfPassBandRippleEdit.setText(str(params["ripple"]))
            elif(params["filttype"] == "bnf"):
                self.gui.filterTypeComboBox.setCurrentIndex(3)
                self.gui.filterDesignTypeComboBox.setCurrentIndex(int(params["wintype"]))

                self.gui.startofBnfStopBandEdit.setText(str(params["sbstart"]))
                self.gui.endofBnfStopBandEdit.setText(str(params["sbend"]))
                self.gui.bnfTransitionEdit.setText(str(params["tb"]))
                self.gui.bnfStopBandAttenEdit.setText(str(params["atten"]))
                if(params["wintype"] == self.EQUIRIPPLE_FILT):
                    self.gui.bnfPassBandRippleEdit.setText(str(params["ripple"]))
            elif(params["filttype"] == "hpf"):
                self.gui.filterTypeComboBox.setCurrentIndex(4)
                self.gui.filterDesignTypeComboBox.setCurrentIndex(int(params["wintype"]))

                self.gui.endofHpfStopBandEdit.setText(str(params["sbend"]))
                self.gui.startofHpfPassBandEdit.setText(str(params["pbstart"]))
                self.gui.hpfStopBandAttenEdit.setText(str(params["atten"]))
                if(params["wintype"] == self.EQUIRIPPLE_FILT):
                    self.gui.hpfPassBandRippleEdit.setText(str(params["ripple"]))
            elif(params["filttype"] == "rrc"):
                self.gui.filterTypeComboBox.setCurrentIndex(5)
                self.gui.filterDesignTypeComboBox.setCurrentIndex(int(params["wintype"]))

                self.gui.rrcSymbolRateEdit.setText(str(params["srate"]))
                self.gui.rrcAlphaEdit.setText(str(params["alpha"]))
                self.gui.rrcNumTapsEdit.setText(str(params["ntaps"]))
            elif(params["filttype"] == "gaus"):
                self.gui.filterTypeComboBox.setCurrentIndex(6)
                self.gui.filterDesignTypeComboBox.setCurrentIndex(int(params["wintype"]))

                self.gui.gausSymbolRateEdit.setText(str(params["srate"]))
                self.gui.gausBTEdit.setText(str(params["bt"]))
                self.gui.gausNumTapsEdit.setText(str(params["ntaps"]))
        else:
            self.iir = True
            self.b, self.a = b_a["b"],b_a["a"]
            (self.z,self.p,self.k) = signal.tf2zpk(self.b, self.a)
            self.gui.pzPlot.insertZeros(self.z)
            self.gui.pzPlot.insertPoles(self.p)
            self.gui.mpzPlot.insertZeros(self.z)
            self.gui.mpzPlot.insertPoles(self.p)
            self.iir_plot_all(self.z,self.p,self.k)
            self.update_fcoeff()
            self.gui.nTapsEdit.setText("-")
            self.params = params

            # Set GUI for IIR type.
            iirft = 	{  "ellip"  : 0,
                           "butter" : 1,
                           "cheby1" : 2,
                           "cheby2" : 3,
                           "bessel" : 4 }

            paramtype = { "analog"  : 1,
                          "digital" : 0 }
            bandpos = {
                "lpf" : 0,
                "bpf" : 1,
                "bnf" : 2,
                "hpf" : 3}

            iirboxes = {"lpf" : [self.gui.iirendofLpfPassBandEdit,
                                 self.gui.iirstartofLpfStopBandEdit,
                                 self.gui.iirLpfPassBandAttenEdit,
                                 self.gui.iirLpfStopBandRippleEdit],

                        "hpf" : [self.gui.iirstartofHpfPassBandEdit,
                                 self.gui.iirendofHpfStopBandEdit,
                                 self.gui.iirHpfPassBandAttenEdit,
                                 self.gui.iirHpfStopBandRippleEdit],

                        "bpf" : [self.gui.iirstartofBpfPassBandEdit,
                                 self.gui.iirendofBpfPassBandEdit,
                                 self.gui.iirendofBpfStopBandEdit1,
                                 self.gui.iirstartofBpfStopBandEdit2,
                                 self.gui.iirBpfPassBandAttenEdit,
                                 self.gui.iirBpfStopBandRippleEdit],

                        "bnf" : [self.gui.iirendofBsfPassBandEdit1,
                                 self.gui.iirstartofBsfPassBandEdit2,
                                 self.gui.iirstartofBsfStopBandEdit,
                                 self.gui.iirendofBsfStopBandEdit,
                                 self.gui.iirBsfPassBandAttenEdit,
                                 self.gui.iirBsfStopBandRippleEdit] }

            self.gui.fselectComboBox.setCurrentIndex(1)
            self.gui.iirfilterTypeComboBox.setCurrentIndex(iirft[params["filttype"]])
            self.gui.iirfilterBandComboBox.setCurrentIndex(bandpos[params["bandtype"]])
            if params["filttype"] == "bessel":
                critfreq = [float(x) for x in params["critfreq"][1:-1].split(',')]
                self.gui.besselordEdit.setText(str(params["filtord"]))
                self.gui.iirbesselcritEdit1.setText(str(critfreq[0]))
                self.gui.iirbesselcritEdit2.setText(str(critfreq[1]))
            else:
                self.gui.adComboBox.setCurrentIndex(paramtype[params["paramtype"]])
                if len(iirboxes[params["bandtype"]]) == 4:
                    sdata = [params["pbedge"], params["sbedge"], params["gpass"], params["gstop"]]
                else:
                    pbedge = list(map(float, params["pbedge"][1:-1].split(',')))
                    sbedge = list(map(float, params["sbedge"][1:-1].split(',')))
                    sdata = [pbedge[0], pbedge[1], sbedge[0],
                             sbedge[1], params["gpass"], params["gstop"]]

                cboxes = iirboxes[params["bandtype"]]
                for i in range(len(cboxes)):
                    cboxes[i].setText(str(sdata[i]))

    def draw_plots(self, taps, params):
        self.params = params
        self.taps = np.array(taps)
        if self.params:
            self.get_fft(self.params["fs"], self.taps, self.nfftpts)
            self.update_time_curves()
            self.update_freq_curves()
            self.update_phase_curves()
            self.update_group_curves()
            self.update_pdelay_curves()
            self.update_step_curves()
            self.update_imp_curves()

        self.gui.nTapsEdit.setText(str(self.taps.size))


class CustomViewBox(pg.ViewBox):
    def __init__(self, *args, **kwds):
        pg.ViewBox.__init__(self, *args, **kwds)
        self.setMouseMode(self.RectMode)

    # Reimplement right-click to zoom out.
    def mouseClickEvent(self, ev):
        if ev.button() == QtCore.Qt.RightButton:
            self.autoRange()

    def mouseDragEvent(self, ev):
        if ev.button() == QtCore.Qt.RightButton:
            ev.ignore()
        else:
            pg.ViewBox.mouseDragEvent(self, ev)


def setup_options():
    usage="%prog: [options] (input_filename)"
    description = ""

    parser = OptionParser(conflict_handler="resolve",
                          usage=usage, description=description)
    return parser

def launch(args, callback=None, restype=""):
    parser = setup_options()
    (options, args) = parser.parse_args ()

    if callback is None:
        app = Qt.QApplication(args)
        gplt = gr_plot_filter(options, callback, restype)
        app.exec_()
        if gplt.iir:
            retobj = ApiObject()
            retobj.update_all("iir", gplt.params, (gplt.b, gplt.a), 1)
            return retobj
        else:
            retobj = ApiObject()
            retobj.update_all("fir", gplt.params, gplt.taps, 1)
            return retobj
    else:
        gplt = gr_plot_filter(options, callback, restype)
        return gplt

def main(args):
    parser = setup_options()
    (options, args) = parser.parse_args ()

    app = Qt.QApplication(args)
    gplt = gr_plot_filter(options)
    app.exec_()
    app.deleteLater()
    sys.exit()

if __name__ == '__main__':
    main(sys.argv)
