def populate(self):
#Insert new curves
self.cSin = Qwt.QwtPlotCurve("y = sin(x)")
self.cSin.setRenderHint(Qwt.QwtPlotItem.RenderAntialiased)
self.cSin.setLegendAttribute(Qwt.QwtPlotCurve.LegendShowLine, True)
self.cSin.setPen(Qt.red)
self.cSin.attach(self)
self.cCos = Qwt.QwtPlotCurve("y = cos(x)")
self.cCos.setRenderHint(Qwt.QwtPlotItem.RenderAntialiased)
self.cCos.setLegendAttribute(Qwt.QwtPlotCurve.LegendShowLine, True)
self.cCos.setPen(Qt.blue)
self.cCos.attach(self)
#Create sin and cos data
self.s = FunctionData(sin)
self.cSin.setData(self.s)
self.c = FunctionData(cos)
self.cCos.setData(self.c)
#Insert markers
# ...a horizontal line at y = 0...
self.mY = Qwt.QwtPlotMarker()
self.mY.setLabel(Qwt.QwtText("y = 0"))
self.mY.setLabelAlignment(Qt.AlignRight | Qt.AlignTop)
self.mY.setLineStyle(Qwt.QwtPlotMarker.HLine)
self.mY.setYValue(0.0)
self.mY.attach(self)
# ...a vertical line at x = 2 * pi
self.mX = Qwt.QwtPlotMarker()
self.mX.setLabel(Qwt.QwtText("x = 2 pi"))
self.mX.setLabelAlignment(Qt.AlignLeft | Qt.AlignBottom)
self.mX.setLabelOrientation(Qt.Vertical)
self.mX.setLineStyle(Qwt.QwtPlotMarker.VLine)
self.mX.setLinePen(Qt.black, 0, Qt.DashDotLine)
self.mX.setXValue(2.0 * pi)
self.mX.attach(self)
x = 7.7
# an arrow at a specific position
self.mPos = Qwt.QwtPlotMarker("Marker")
self.mPos.setRenderHint(Qwt.QwtPlotItem.RenderAntialiased, True)
self.mPos.setItemAttribute(Qwt.QwtPlotItem.Legend, True)
self.arr = ArrowSymbol()
self.mPos.setSymbol(self.arr)
self.mPos.setValue(QPointF(x, sin(x)))
self.mPos.setLabel(Qwt.QwtText("x = %.1f" % x))
self.mPos.setLabelAlignment(Qt.AlignRight | Qt.AlignBottom)
self.mPos.attach(self)
def __init__(self,parent):
super().__init__(parent)
self.__d_interval = Qwt.QwtInterval( 0.0, 10.0 )
self.__d_timerId = -1
self.__d_directPainter = Qwt.QwtPlotDirectPainter()
self.__d_clock = Qwt.QwtSystemClock()
self.__d_paintedPoints = 0
self.setAutoReplot( False )
self.setCanvas( Canvas() )
self.plotLayout().setAlignCanvasToScales( True )
self.setAxisTitle( Qwt.QwtPlot.xBottom, "Time [s]" )
self.setAxisScale( Qwt.QwtPlot.xBottom, self.__d_interval.minValue(), self.__d_interval.maxValue() )
self.setAxisScale( Qwt.QwtPlot.yLeft, -200.0, 200.0 )
self.grid = Qwt.QwtPlotGrid()
self.grid.setPen( Qt.gray, 0.0, Qt.DotLine )
self.grid.enableX( True )
self.grid.enableXMin( True )
self.grid.enableY( True )
self.grid.enableYMin( False )
self.grid.attach( self )
self.__d_origin = Qwt.QwtPlotMarker()
self.__d_origin.setLineStyle( Qwt.QwtPlotMarker.Cross )
self.__d_origin.setValue( self.__d_interval.minValue() + self.__d_interval.width() / 2.0, 0.0 )
self.__d_origin.setLinePen( Qt.gray, 0.0, Qt.DashLine )
self.__d_origin.attach( self )
self.__d_curve = Qwt.QwtPlotCurve()
self.__d_curve.setStyle( Qwt.QwtPlotCurve.Lines )
self.__d_curve.setPen( self.canvas().palette().color( QPalette.WindowText ) )
self.__d_curve.setRenderHint( Qwt.QwtPlotItem.RenderAntialiased, True )
self.__d_curve.setPaintAttribute( Qwt.QwtPlotCurve.ClipPolygons, False )
self.__cdata = CurveData()
self.__d_curve.setData( self.__cdata )
self.__d_curve.attach( self )
def __init__(self, parent=None):
Qwt.QwtPlot.__init__(self, parent)
self.setAutoReplot(False)
self.setTitle("Frequency Response of a Second-Order System")
canvas = Qwt.QwtPlotCanvas()
canvas.setBorderRadius(10)
self.setCanvas(canvas)
self.setCanvasBackground(QColor("MidnightBlue"))
# legend
legend = Qwt.QwtLegend()
self.insertLegend(legend, Qwt.QwtPlot.BottomLegend)
# grid
grid = Qwt.QwtPlotGrid()
grid.enableXMin(True)
grid.setMajorPen(Qt.white, 0, Qt.DotLine)
grid.setMinorPen(Qt.gray, 0, Qt.DotLine)
grid.attach(self)
# axes
self.enableAxis(Qwt.QwtPlot.yRight)
self.setAxisTitle(Qwt.QwtPlot.xBottom, "Normalized Frequency")
self.setAxisTitle(Qwt.QwtPlot.yLeft, "Amplitude [dB]")
self.setAxisTitle(Qwt.QwtPlot.yRight, "Phase [deg]")
self.setAxisMaxMajor(Qwt.QwtPlot.xBottom, 6)
self.setAxisMaxMinor(Qwt.QwtPlot.xBottom, 9)
self.setAxisScaleEngine(Qwt.QwtPlot.xBottom, Qwt.QwtLogScaleEngine())
# curves
self.d_curve1 = Qwt.QwtPlotCurve("Amplitude")
self.d_curve1.setRenderHint(Qwt.QwtPlotItem.RenderAntialiased)
self.d_curve1.setPen(Qt.yellow)
self.d_curve1.setLegendAttribute(Qwt.QwtPlotCurve.LegendShowLine)
self.d_curve1.setYAxis(Qwt.QwtPlot.yLeft)
self.d_curve1.attach(self)
self.d_curve2 = Qwt.QwtPlotCurve("Phase")
self.d_curve2.setRenderHint(Qwt.QwtPlotItem.RenderAntialiased)
self.d_curve2.setPen(Qt.cyan)
self.d_curve2.setLegendAttribute(Qwt.QwtPlotCurve.LegendShowLine)
self.d_curve2.setYAxis(Qwt.QwtPlot.yRight)
self.d_curve2.attach(self)
# marker
self.d_marker1 = Qwt.QwtPlotMarker()
self.d_marker1.setValue(0.0, 0.0)
self.d_marker1.setLineStyle(Qwt.QwtPlotMarker.VLine)
self.d_marker1.setLabelAlignment(Qt.AlignRight | Qt.AlignBottom)
self.d_marker1.setLinePen(Qt.green, 0, Qt.DashDotLine)
self.d_marker1.attach(self)
self.d_marker2 = Qwt.QwtPlotMarker()
self.d_marker2.setLineStyle(Qwt.QwtPlotMarker.HLine)
self.d_marker2.setLabelAlignment(Qt.AlignRight | Qt.AlignBottom)
self.d_marker2.setLinePen(QColor(200, 150, 0), 0, Qt.DashDotLine)
self.d_marker2.setSymbol(
Qwt.QwtSymbol(Qwt.QwtSymbol.Diamond, QColor(Qt.yellow),
QColor(Qt.green), QSize(8, 8)))
self.d_marker2.attach(self)
self.setDamp(0)
self.setAutoReplot(True)