def update(self, timestamp, device, channel, data):
'''Update the data for the device (+channel) with the most recent
measurement from the given payload.'''
item = self.getItem(device, channel)
value, unit, mqflags = data
value_str = self.format_value(value)
unit_str = util.format_unit(unit)
mqflags_str = self.format_mqflags(mqflags)
# The display role is a tuple containing the value and the unit/flags.
disp = (value_str, ' '.join([unit_str, mqflags_str]))
item.setData(disp, QtCore.Qt.DisplayRole)
# The samples role is a dictionary that contains the old samples for each unit.
# Should be trimmed periodically, otherwise it grows larger and larger.
if not math.isinf(value) and not math.isnan(value):
sample = (timestamp, value)
traces = item.data(MeasurementDataModel.tracesRole)
# It's not possible to use 'collections.defaultdict' here, because
# PySide doesn't return the original type that was passed in.
if not (unit in traces):
traces[unit] = Trace()
traces[unit].append(sample)
item.setData(traces, MeasurementDataModel.tracesRole)
def update(self, timestamp, device, channel, data):
'''Update the data for the device (+channel) with the most recent
measurement from the given payload.'''
item = self.getItem(device, channel)
value, unit, mqflags = data
value_str = self.format_value(value)
unit_str = util.format_unit(unit)
mqflags_str = self.format_mqflags(mqflags)
# The display role is a tuple containing the value and the unit/flags.
disp = (value_str, ' '.join([unit_str, mqflags_str]))
item.setData(disp, QtCore.Qt.DisplayRole)
# The samples role is a dictionary that contains the old samples for each unit.
# Should be trimmed periodically, otherwise it grows larger and larger.
if not math.isinf(value) and not math.isnan(value):
sample = (timestamp, value)
traces = item.data(MeasurementDataModel.tracesRole)
# It's not possible to use 'collections.defaultdict' here, because
# PySide doesn't return the original type that was passed in.
if not (unit in traces):
traces[unit] = Trace()
traces[unit].append(sample)
item.setData(traces, MeasurementDataModel.tracesRole)
def _getPlot(self, unit):
'''Looks up or creates a new plot for 'unit'.'''
if unit in self._plots:
return self._plots[unit]
# create a new plot for the unit
plot = self.plotwidget.addPlot()
plot.yaxis.setLabel(util.quantity_from_unit(unit), units=util.format_unit(unit))
plot.view.setXRange(-settings.graph.backlog.value(), 0, update=False)
plot.view.setYRange(-1, 1)
plot.view.enableAutoRange(axis=pyqtgraph.ViewBox.YAxis)
# lock to the range calculated by the view using additional padding,
# looks nicer this way
r = plot.view.viewRange()
plot.view.setLimits(xMin=r[0][0], xMax=r[0][1])
self._plots[unit] = plot
return plot
def _getPlot(self, unit):
'''Looks up or creates a new plot for 'unit'.'''
if unit in self._plots:
return self._plots[unit]
# Create a new plot for the unit.
plot = self.plotwidget.addPlot()
plot.yaxis.setLabel(util.quantity_from_unit(unit), units=util.format_unit(unit))
plot.view.setXRange(-settings.graph.backlog.value(), 0, update=False)
plot.view.setYRange(-1, 1)
plot.view.enableAutoRange(axis=pyqtgraph.ViewBox.YAxis)
# Lock to the range calculated by the view using additional padding,
# looks nicer this way.
r = plot.view.viewRange()
plot.view.setLimits(xMin=r[0][0], xMax=r[0][1])
self._plots[unit] = plot
return plot