If you're just wanting a visual reference when a tag was in an alarmed state, I imagine the simplest solution would be to place some value and interval markers on the easy chart.
Example:
• Add a button to the window, and give it two custom properties: alarmPath and journalData
• Perform a journal query from the button's action performed event handler using the easyChart's start and end date as well as the button's alarmPath property to filter the data:
easyChart = event.source.parent.getComponent('Easy Chart')
startDate = easyChart.startDate
endDate = easyChart.endDate
alarmPath = event.source.alarmPath
def getJournalData(start = startDate, end = endDate, alarm = alarmPath):
journalData = system.alarm.queryJournal(journal = 'Journal', startDate = start, endDate = end, path = alarm).dataset
def setJournalData():
event.source.journalData = journalData
system.util.invokeLater(setJournalData)
system.util.invokeAsynchronous(getJournalData)
• Create a couple of custom methods [or library scripts] for adding markers to the chart's plot:
addIntervalMarker custom method
#def addIntervalMarker(self, startDate, endDate):
from org.jfree.chart.plot import IntervalMarker
faultColor = system.gui.color(255, 0, 0, 100)
plot = self.parent.getComponent('Easy Chart').getComponent(0).getComponent(0).chart.plot
plot.addDomainMarker(IntervalMarker(system.date.toMillis(startDate), system.date.toMillis(endDate), faultColor))
addValueMarker custom method
#def addValueMarker(self, date):
from org.jfree.chart.plot import ValueMarker
from java.awt import BasicStroke
chartX = system.date.toMillis(date)
plot = self.parent.getComponent('Easy Chart').getComponent(0).getComponent(0).chart.plot
faultColor = system.gui.color('red')
valueMarker = ValueMarker(chartX)
valueMarker.setStroke(BasicStroke(3))
valueMarker.setPaint(faultColor)
plot.addDomainMarker(valueMarker)
• Finally, add the markers to the chart using the journalData property change event in the propertyChange event handler:
if event.propertyName == 'journalData':
easyChart = event.source.parent.getComponent('Easy Chart')
# Reset existing domain markers
plot = easyChart.getComponent(0).getComponent(0).chart.plot
plot.clearDomainMarkers()
# Locate all the active to not active intervals,
# and put the start and end of each in a list
journalData = event.newValue
intervalList = []
currentStartDate = None
for row in xrange(journalData.rowCount):
eventTime = journalData.getValueAt(row, 'EventTime')
eventState = journalData.getValueAt(row, 'EventState')
if eventState > 1 and not currentStartDate:
currentStartDate = eventTime
elif eventState < 2 and currentStartDate is not None:
intervalList.append([currentStartDate, eventTime])
currentStartDate = None
# If the last entry is alarmed, extend the alarm to the end of the chart
if currentStartDate:
intervalList.append([currentStartDate, easyChart.endDate])
# Iterate through the intervals and mark the chart
for interval in intervalList:
alarmStart, alarmEnd = interval
event.source.addIntervalMarker(alarmStart, alarmEnd)
event.source.addValueMarker(alarmStart)
event.source.addValueMarker(alarmEnd)
Result:
Edit: Improved interval segmenting logic