I’m interested in finding out how FactoryPMI charts data.
As long term users of GE Fanuc’s iFIX, we had one big bugbear with its charting - it could draw misleading plots of the data. For example, if the chart area on the screen was 1000 pixels wide, the charting algorithm would look up the data to be charted and plot 1000 evenly spaced points. This would have the result of potentially missing momentary peaks and troughs in the data.
We came across another package which had a good solution for this problem. In the above example it would divide the data into 1000 blocks, then return the maximum and minimum values for each block. The chart would then draw a vertical line for each area between the maximum and minimum values. This meant that no matter how far you were zoomed out, you would still get an accurate picture of how the trend had varied.
As far as I know, FactoryPMI does not do this. Does it take another approach, or is this something that could be included for the future?