I have several charts, XY "probability" charts, Histograms, etc. How would I add a "spec" line to these charts.
spec is an upper limit or lower limit or both, for a set of data. to denote what is good results and what is bad results, for a set of test data results.
You can use Axis.addMark to add vertical or horizontal mark lines at the position you want, and/or to use Axis.addZone, XYChart.xZoneColor and XYChart.yZoneColor to color specific data range. See:
Some old examples I can find in this forum are as follows (which shows that ChartDirector has been used in Statistical Process Control for a long time):
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Add "spec" line to a chart