def make():
demo = QwtPlot()
demo.setCanvasBackground(Qt.white)
demo.setTitle("Histogram")
grid = QwtPlotGrid()
grid.enableXMin(True)
grid.enableYMin(True)
grid.setMajorPen(QPen(Qt.black, 0, Qt.DotLine))
grid.setMinorPen(QPen(Qt.gray, 0, Qt.DotLine))
grid.attach(demo)
histogram = HistogramItem()
histogram.setColor(Qt.darkCyan)
numValues = 20
samples = []
pos = 0.0
for i in range(numValues):
width = 5 + random.randint(0, 4)
value = random.randint(0, 99)
samples.append(QwtIntervalSample(value, QwtInterval(pos, pos + width)))
pos += width
histogram.setData(QwtIntervalSeriesData(samples))
histogram.attach(demo)
demo.setAxisScale(QwtPlot.yLeft, 0.0, 100.0)
demo.setAxisScale(QwtPlot.xBottom, 0.0, pos)
demo.replot()
demo.resize(600, 400)
demo.show()
return demo
def __init__(self, *args):
QwtPlot.__init__(self, *args)
self.curves = {}
self.data = {}
self.timeData = 1.0 * np.arange(0, HISTORY, 1)
self.MemStat = MemStat()
self.setAutoReplot(False)
self.plotLayout().setAlignCanvasToScales(True)
self.setAxisScale(QwtPlot.xBottom, HISTORY, 0)
self.setAxisScale(QwtPlot.yLeft, 0, 100)
self.setAxisLabelAlignment(QwtPlot.xBottom,
Qt.AlignLeft | Qt.AlignBottom)
grid = QwtPlotGrid()
grid.enableXMin(True)
grid.enableYMin(True)
grid.setMajPen(QPen(Qt.black, 0, Qt.DotLine))
grid.setMinPen(QPen(Qt.gray, 0, Qt.DotLine))
grid.attach(self)
stat = MemStat.statistic()
self.data["MemTotal"] = np.zeros(HISTORY, float)
self.data["MemFree"] = np.zeros(HISTORY, float)
self.data["SwapTotal"] = np.zeros(HISTORY, float)
self.data["SwapFree"] = np.zeros(HISTORY, float)
curve = MemoryCurve("Memory")
curve.setColor(self.colors[0])
curve.attach(self)
self.curves["Memory"] = curve
self.data["Memory"] = np.zeros(HISTORY, float)
curve = MemoryCurve("Swap")
curve.setColor(self.colors[1])
curve.attach(self)
self.curves["Swap"] = curve
self.data["Swap"] = np.zeros(HISTORY, float)
self.startTimer(1000)
self.replot()
class BodePlot(QwtPlot):
def __init__(self, *args):
QwtPlot.__init__(self, *args)
self.setTitle('Frequency Response of a 2<sup>nd</sup>-order System')
self.setCanvasBackground(Qt.darkBlue)
# legend
legend = QwtLegend()
legend.setFrameStyle(QFrame.Box | QFrame.Sunken)
self.insertLegend(legend, QwtPlot.BottomLegend)
# grid
self.grid = QwtPlotGrid()
self.grid.enableXMin(True)
self.grid.attach(self)
# axes
self.enableAxis(QwtPlot.yRight)
self.setAxisTitle(QwtPlot.xBottom, '\u03c9/\u03c9<sub>0</sub>')
self.setAxisTitle(QwtPlot.yLeft, 'Amplitude [dB]')
self.setAxisTitle(QwtPlot.yRight, 'Phase [\u00b0]')
self.setAxisMaxMajor(QwtPlot.xBottom, 6)
self.setAxisMaxMinor(QwtPlot.xBottom, 10)
self.setAxisScaleEngine(QwtPlot.xBottom, QwtLogScaleEngine())
# curves
self.curve1 = QwtPlotCurve('Amplitude')
self.curve1.setRenderHint(QwtPlotItem.RenderAntialiased);
self.curve1.setPen(QPen(Qt.yellow))
self.curve1.setYAxis(QwtPlot.yLeft)
self.curve1.attach(self)
self.curve2 = QwtPlotCurve('Phase')
self.curve2.setRenderHint(QwtPlotItem.RenderAntialiased);
self.curve2.setPen(QPen(Qt.cyan))
self.curve2.setYAxis(QwtPlot.yRight)
self.curve2.attach(self)
# alias
fn = self.fontInfo().family()
# marker
self.dB3Marker = m = QwtPlotMarker()
m.setValue(0.0, 0.0)
m.setLineStyle(QwtPlotMarker.VLine)
m.setLabelAlignment(Qt.AlignRight | Qt.AlignBottom)
m.setLinePen(QPen(Qt.green, 2, Qt.DashDotLine))
text = QwtText('')
text.setColor(Qt.green)
text.setBackgroundBrush(Qt.red)
text.setFont(QFont(fn, 12, QFont.Bold))
m.setLabel(text)
m.attach(self)
self.peakMarker = m = QwtPlotMarker()
m.setLineStyle(QwtPlotMarker.HLine)
m.setLabelAlignment(Qt.AlignRight | Qt.AlignBottom)
m.setLinePen(QPen(Qt.red, 2, Qt.DashDotLine))
text = QwtText('')
text.setColor(Qt.red)
text.setBackgroundBrush(QBrush(self.canvasBackground()))
text.setFont(QFont(fn, 12, QFont.Bold))
m.setLabel(text)
m.setSymbol(QwtSymbol(QwtSymbol.Diamond,
QBrush(Qt.yellow),
QPen(Qt.green),
QSize(7,7)))
m.attach(self)
# text marker
m = QwtPlotMarker()
m.setValue(0.1, -20.0)
m.setLabelAlignment(Qt.AlignRight | Qt.AlignBottom)
text = QwtText(
'[1-(\u03c9/\u03c9<sub>0</sub>)<sup>2</sup>+2j\u03c9/Q]'
'<sup>-1</sup>'
)
text.setFont(QFont(fn, 12, QFont.Bold))
text.setColor(Qt.blue)
text.setBackgroundBrush(QBrush(Qt.yellow))
text.setBorderPen(QPen(Qt.red, 2))
m.setLabel(text)
m.attach(self)
self.setDamp(0.01)
def showData(self, frequency, amplitude, phase):
self.curve1.setData(frequency, amplitude)
self.curve2.setData(frequency, phase)
def showPeak(self, frequency, amplitude):
self.peakMarker.setValue(frequency, amplitude)
label = self.peakMarker.label()
label.setText('Peak: %4g dB' % amplitude)
self.peakMarker.setLabel(label)
def show3dB(self, frequency):
self.dB3Marker.setValue(frequency, 0.0)
label = self.dB3Marker.label()
label.setText('-3dB at f = %4g' % frequency)
self.dB3Marker.setLabel(label)
def setDamp(self, d):
self.damping = d
# Numerical Python: f, g, a and p are NumPy arrays!
f = np.exp(np.log(10.0)*np.arange(-2, 2.02, 0.04))
g = 1.0/(1.0-f*f+2j*self.damping*f)
a = 20.0*np.log10(abs(g))
p = 180*np.arctan2(g.imag, g.real)/np.pi
# for show3dB
i3 = np.argmax(np.where(np.less(a, -3.0), a, -100.0))
f3 = f[i3] - (a[i3]+3.0)*(f[i3]-f[i3-1])/(a[i3]-a[i3-1])
# for showPeak
imax = np.argmax(a)
self.showPeak(f[imax], a[imax])
self.show3dB(f3)
self.showData(f, a, p)
self.replot()
class BodePlot(QwtPlot):
def __init__(self, *args):
QwtPlot.__init__(self, *args)
self.setTitle('Frequency Response of a 2<sup>nd</sup>-order System')
self.setCanvasBackground(Qt.darkBlue)
# legend
legend = QwtLegend()
legend.setFrameStyle(QFrame.Box | QFrame.Sunken)
self.insertLegend(legend, QwtPlot.BottomLegend)
# grid
self.grid = QwtPlotGrid()
self.grid.enableXMin(True)
self.grid.attach(self)
# axes
self.enableAxis(QwtPlot.yRight)
self.setAxisTitle(QwtPlot.xBottom, '\u03c9/\u03c9<sub>0</sub>')
self.setAxisTitle(QwtPlot.yLeft, 'Amplitude [dB]')
self.setAxisTitle(QwtPlot.yRight, 'Phase [\u00b0]')
self.setAxisMaxMajor(QwtPlot.xBottom, 6)
self.setAxisMaxMinor(QwtPlot.xBottom, 10)
self.setAxisScaleEngine(QwtPlot.xBottom, QwtLogScaleEngine())
# curves
self.curve1 = QwtPlotCurve('Amplitude')
self.curve1.setRenderHint(QwtPlotItem.RenderAntialiased)
self.curve1.setPen(QPen(Qt.yellow))
self.curve1.setYAxis(QwtPlot.yLeft)
self.curve1.attach(self)
self.curve2 = QwtPlotCurve('Phase')
self.curve2.setRenderHint(QwtPlotItem.RenderAntialiased)
self.curve2.setPen(QPen(Qt.cyan))
self.curve2.setYAxis(QwtPlot.yRight)
self.curve2.attach(self)
# alias
fn = self.fontInfo().family()
# marker
self.dB3Marker = m = QwtPlotMarker()
m.setValue(0.0, 0.0)
m.setLineStyle(QwtPlotMarker.VLine)
m.setLabelAlignment(Qt.AlignRight | Qt.AlignBottom)
m.setLinePen(QPen(Qt.green, 2, Qt.DashDotLine))
text = QwtText('')
text.setColor(Qt.green)
text.setBackgroundBrush(Qt.red)
text.setFont(QFont(fn, 12, QFont.Bold))
m.setLabel(text)
m.attach(self)
self.peakMarker = m = QwtPlotMarker()
m.setLineStyle(QwtPlotMarker.HLine)
m.setLabelAlignment(Qt.AlignRight | Qt.AlignBottom)
m.setLinePen(QPen(Qt.red, 2, Qt.DashDotLine))
text = QwtText('')
text.setColor(Qt.red)
text.setBackgroundBrush(QBrush(self.canvasBackground()))
text.setFont(QFont(fn, 12, QFont.Bold))
m.setLabel(text)
m.setSymbol(
QwtSymbol(QwtSymbol.Diamond, QBrush(Qt.yellow), QPen(Qt.green),
QSize(7, 7)))
m.attach(self)
# text marker
m = QwtPlotMarker()
m.setValue(0.1, -20.0)
m.setLabelAlignment(Qt.AlignRight | Qt.AlignBottom)
text = QwtText('[1-(\u03c9/\u03c9<sub>0</sub>)<sup>2</sup>+2j\u03c9/Q]'
'<sup>-1</sup>')
text.setFont(QFont(fn, 12, QFont.Bold))
text.setColor(Qt.blue)
text.setBackgroundBrush(QBrush(Qt.yellow))
text.setBorderPen(QPen(Qt.red, 2))
m.setLabel(text)
m.attach(self)
self.setDamp(0.01)
def showData(self, frequency, amplitude, phase):
self.curve1.setData(frequency, amplitude)
self.curve2.setData(frequency, phase)
def showPeak(self, frequency, amplitude):
self.peakMarker.setValue(frequency, amplitude)
label = self.peakMarker.label()
label.setText('Peak: %4g dB' % amplitude)
self.peakMarker.setLabel(label)
def show3dB(self, frequency):
self.dB3Marker.setValue(frequency, 0.0)
label = self.dB3Marker.label()
label.setText('-3dB at f = %4g' % frequency)
self.dB3Marker.setLabel(label)
def setDamp(self, d):
self.damping = d
# Numerical Python: f, g, a and p are NumPy arrays!
f = np.exp(np.log(10.0) * np.arange(-2, 2.02, 0.04))
g = 1.0 / (1.0 - f * f + 2j * self.damping * f)
a = 20.0 * np.log10(abs(g))
p = 180 * np.arctan2(g.imag, g.real) / np.pi
# for show3dB
i3 = np.argmax(np.where(np.less(a, -3.0), a, -100.0))
f3 = f[i3] - (a[i3] + 3.0) * (f[i3] - f[i3 - 1]) / (a[i3] - a[i3 - 1])
# for showPeak
imax = np.argmax(a)
self.showPeak(f[imax], a[imax])
self.show3dB(f3)
self.showData(f, a, p)
self.replot()
