class SpeedPlotPanel(sc.SizedPanel):
'''
classdocs
'''
def __init__(self, parent, maxAgeBuffer, *args, **kwargs):
"""Create the DemoPanel."""
sc.SizedPanel.__init__(self, parent, *args, **kwargs)
#self.parent = parent
self._TimeStamps = []
self._SpeedValuesMotor1 = []
self._SpeedValuesMotor2 = []
self._ExtractPlotData(maxAgeBuffer)
self._InitializePlot()
def _InitializePlot(self):
self._DPI = 100
self._Figure = Figure(dpi=self._DPI)
self._Plot = self._Figure.add_subplot(111)
self._Plot.set_axis_bgcolor('black')
self._Plot.set_title('Speed', size=12)
self._Plot.grid(True, color='gray')
pylab.setp(self._Plot.get_xticklabels(), fontsize=8)
pylab.setp(self._Plot.get_yticklabels(), fontsize=8)
formatter = mpldates.DateFormatter('%M:%S')
self._Plot.xaxis.set_major_formatter(formatter)
# plot the data as a line series, and save the reference
# to the plotted line series
#
self._Traces = []
trace = self._Plot.plot(
self._TimeStamps,
self._SpeedValuesMotor1,
linewidth=1,
color=(1, 0, 0),
)[0]
self._Traces.append(trace)
trace = self._Plot.plot(
self._TimeStamps,
self._SpeedValuesMotor2,
linewidth=1,
color=(0, 1, 0),
)[0]
self._Traces.append(trace)
legend = self._Plot.legend(('Motor 1', 'Motor 2'),
shadow=False,
labelspacing=0.001,
loc='upper left')
for text in legend.get_texts():
text.set_fontsize('x-small') # the legend text fontsize
self._FigureCanvas = FigureCanvas(self, -1, self._Figure)
self._FigureCanvas.SetSizerProps(expand=True, proportion=1)
def Refresh(self, maxAgeBuffer, now):
self._ExtractPlotData(maxAgeBuffer)
self._DrawPlot(maxAgeBuffer, now)
def _ExtractPlotData(self, maxAgeBuffer):
del self._TimeStamps[:]
del self._SpeedValuesMotor1[:]
del self._SpeedValuesMotor2[:]
try:
for timeStampedValue in maxAgeBuffer:
self._TimeStamps.append(timeStampedValue.TimeStamp)
self._SpeedValuesMotor1.append(timeStampedValue.Value[3])
self._SpeedValuesMotor2.append(timeStampedValue.Value[4])
except RuntimeError:
# We iterate over a queue that is filled by another thread. The correct approach would
# be to use synchronization. For simplicity we ignore the error.
# Every so often we get an error of this form:
# RuntimeError: deque mutated during iteration
pass
def _DrawPlot(self, maxAgeBuffer, now):
""" Redraws the plot
"""
#print 'redrawing'
#print self._TimeStamps
#print self._Values1
self._Plot.set_xbound(lower=now - maxAgeBuffer.MaximumAge, upper=now)
self._Plot.set_ybound(lower=-1.1, upper=1.1)
self._Traces[0].set_xdata(self._TimeStamps)
self._Traces[0].set_ydata(self._SpeedValuesMotor1)
self._Traces[1].set_xdata(self._TimeStamps)
self._Traces[1].set_ydata(self._SpeedValuesMotor2)
# self.plot_data.set_xdata(np.arange(len(self.data)))
# self.plot_data.set_ydata(np.array(self.data))
if len(self._TimeStamps) > 0:
self._FigureCanvas.draw()
