Vision Chart - Category Chart & XTrace

Ignition
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2

So, this post from lrose and this one from Travis were very helpful in getting something working on the chart with only the category bars.

Basic annotation
Basic annotation303×360 7.43 KB

from org.jfree.chart import ChartMouseListener
from org.jfree.chart.annotations import CategoryTextAnnotation
	
chartObject = self
	
class CustomChartMouseListener(ChartMouseListener):
	def chartMouseMoved(self,e):
		pass
	def chartMouseClicked(self,e):
		# Get plot, remove previous annotations
		plot = chart.getPlot()
		plot.clearAnnotations()
		
		# get chart data & create annotation
		if e.getEntity(): 
			# Get dataset(s)
			dataset = chartObject.b_MonthlyWater
			colNames = dataset.getColumnNames()
			ds = system.dataset.toPyDataSet(dataset)
			
			# Wrap in try to prevent error clicking on axis
			try:
				# Get category from entity
				category = e.getEntity().columnKey
				for row in ds:
					if row[0] == category:
						rData = (row[1], row[2])
						y = max(rData)+100 #offset so annotation is above tallest bar
				
				# Add annotation
				annoStr = str(colNames[1])+": "+str(int(rData[0]))+", "+str(colNames[2])+": "+str(int(rData[1]))
				plot.addAnnotation(CategoryTextAnnotation(annoStr, category, y))
			
			except:
				pass
	
# Ensure only 1 listener running
for listener in self.getListeners(ChartMouseListener):
     self.removeChartMouseListener(listener)
	
# Run listener
self.addChartMouseListener(CustomChartMouseListener())

A couple outstanding issues:

  • Adding the xy category overlay breaks the function, and clicking on the chart will not produce annotations.
  • Documentation suggests the annotations will support HTML, but as of yet I've been unable to produce a multi-line entry.

Will update as I progress.