Chart inconsisten plotting

[Garret Mott]

[apologies for the misspelling in the title - should be "inconsistent"]

Hello -

DF 21 MS SQL DAW Driver. CJ 18.6.0

I've got a line chart (well a bunch, but they all have the same issue). Y axis is numbers & it seems accurate. X axis is time & that's where my issue is. This is a chart that is updated dynamically as a test is run.

We are presetting the X axis to 60 (seconds). The chart is updated roughly every second - though it can vary from .8 seconds to 1.2 or so. This means that the passed X coordinates might be 1.0, 2.1, 3.4, 4.3, etc. The last coordinate passed is always 60.0

I am passing X & Y coordinates to a procedure:

    Procedure SetDataManual String sXVal String sYVal
        tdSeriesPointValues[] ThePointData
        Integer i iSize

        Get ptData of ghoGraphDataLoader to ThePointData 
        Move (SizeOfArray(ThePointData)) to iSize
        Move sXVal to ThePointData[iSize].sXAxisValue
        Move sYVal to ThePointData[iSize].sYAxisValue1
        Set ptData of ghoGraphDataLoader to ThePointData 
        
        Function_Return (SizeOfArray(ThePointData))
    End_Procedure

The above is setting the struct in cSIGCJGridChartControl.pkg:

Struct tdSeriesPointValues
    String sXAxisValue
    String sYAxisValue1
    String sYAxisValue2
    String sYAxisValue3
    String sYAxisValue4
    String sToolTipText
End_Struct

As the line is built we've watched what's passed & as deep as we can get into the control, the #'s match what was originally passed.

The issue is that the chart line "falls behind" & ends early sometimes - varying between 45 & 60 seconds. Here's one that got kinda close:



As we watch it build the line, we can see it falling behind: say the # passed is 30.00, but the chart is only to 28, then 41.2 passed & the chart is at 37, etc.

We have tried passing integer values and numbers up to 4 decimal places - no difference.

Anyone have any thoughts?