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 show3dB(self, freq):
label = "-3 dB at f = %.3g" % freq
text = Qwt.QwtText(label)
text.setFont(QFont("Helvetica", 10, QFont.Bold))
text.setColor(Qt.green)
self.d_marker1.setValue(freq, 0.0)
self.d_marker1.setLabel(text)
def showPeak(self, freq, amplitude):
label = "Peak: %.3g dB" % amplitude
text = Qwt.QwtText(label)
text.setFont(QFont("Helvetica", 10, QFont.Bold))
text.setColor(QColor(200, 150, 0))
self.d_marker2.setValue(freq, amplitude)
self.d_marker2.setLabel(text)
def populate(self):
colors = [colours["DarkOrchid"], colours["SteelBlue"], colours["Gold"]]
numSamples = 5
numBars = len(colors)
titles = []
for i in range(numBars):
titles.append(Qwt.QwtText("Bar %d" % i))
self.d_barChartItem.setBarTitles(titles)
self.d_barChartItem.setLegendIconSize(QSize(10, 14))
for i in range(numBars):
symbol = Qwt.QwtColumnSymbol(Qwt.QwtColumnSymbol.Box)
symbol.setLineWidth(2)
symbol.setFrameStyle(Qwt.QwtColumnSymbol.Raised)
symbol.setPalette(QPalette(colors[i]))
self.d_barChartItem.setSymbol(i, symbol)
self.series = []
for i in range(numSamples):
values = []
for j in range(numBars):
values.append(2.0 + random.randint(0, 8) % 8)
self.series.append(values)
print(self.series)
self.d_barChartItem.setSamples(self.series)