How calculate integral of history tag

Ignition
8

With the help of one of @pturmel's scripts to find the underlying chart, something like this in the propertyChange script of the Easy Chart.

For testing only. Break some of this out into project scripts for use in production. :wink:

def findJFChart(src): 
    """IA's EasyChart and XYPlot components have their JFreeChart objects at different positions in the Container/Component hierarchy. 
    This helper function scans the hierarchy, given a container or component as a starting point, and returns a tuple containing 
    the parent JFreeChartPanel and the targeted JFreeChart. Note: The hierarchy is searched depth-first! """ 
    try: 
        return (src, src.chart) 
    except: 
        pass 
    try: 
        for x in range(src.componentCount): 
            try: 
                return findJFChart(src.getComponent(x)) 
            except: pass 
    except: 
        pass 
        raise ValueError, "Unable to Find a JFreeChart Instance"
        
if event.propertyName == 'startDate' or event.propertyName == 'endDate':
	component = event.source
	
	src, chart = findJFChart(component)
	
	dataIn = system.dataset.toPyDataSet(chart.getXYPlot().dataset.getDataSetForSeries(0))
	startTime = dataIn[0][0]
	kWseconds = 0.0
	for prevRow, row in zip(dataIn, dataIn[1:]):
		if row[1] == 0:
			break
		b1 = prevRow[1]
		b2 = row[1]
		h = system.date.secondsBetween(prevRow[0], row[0])
		kWseconds += (b1+b2)/2*h	
	totalSeconds = system.date.secondsBetween(startTime, prevRow[0])
	kWh = kWseconds / totalSeconds
	
	# Write value to some other component
	#event.source.parent.getComponent('Label').text = str(kWh)
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