Re: Having problems clearing Design time "random" values when starting real timechart

[User (Legacy)]

Michael, 

Thanks for the suggestions.   I'm not sure that "hiding" the 

data values will solve my problem as I need to eventually 

save the chart data to a file and I don't want to include the 

random initial values in the saved data file.  I'm assuming even 

if the data points are hidden, they still exist in the chart's data array. 

I suppose I could hide them and then include an offset when I reference 

the data during a SAVE operation, i.e. -> ValueEx(series, datapoint+20), 

but I'd rather not have to do this. 

    Also, I can't get away with hiding one of the series and having the 

other one visible. 

   The "compressing" I was referring to occurs when I specify a 

a value of 0 for the Number of Values property in the chart's 

Data/Behavior tab.  What seems to be happening is that as I add 

values to the chart in real time using: 

   OpenDataEx COD_VALUES Or COD_ADDPOINTS, 2, 1 

The X axis automatically scales itself and the space between tick 

marks on the X axis shrinks as I add data points.  When I get to 

20 data points the X axis "stablizes" itself and the chart tracks 

smoothly.   Oddly enough, if I include the code below prior to 

starting the chart: 

   frmMain.TempPlot.OpenDataEx COD_VALUES Or COD_REMOVE, 2, 20 

   frmMain.TempPlot.CloseData COD_VALUES 

The chart seems to "know" how to scale the X axis and this automatic 

scaling effect does not occur over the first 20 values.  However, the 

side effect is that my first data point starts out at an X value of "21". 

I think I'm close to solving this but there is still a small peice of the 

puzzle 

I'm missing here :-) 

Gary 

Software Engineering Manager, Sekidnko Inc. 

gkercheck@yahoo.com 

"Michael J. Archambault" wrote: 

> Gary, 

> 

>  hi, you can try looping through the x and y values, setting them to 

> CHART_HIDDEN . This will make the values off the chart, 

> and therefore not show up. This method, however, will leave 1 series 

> present. 

> 

> Alternatively, you can remove the first, (and only upon startup)series, 

> by 

> performing an OpenDataEx-CloseData sequence specifying one less series, in 

> this case, 0. 

> 

> hope that helps! 

> 

> michael 

> 

> ps. what did you mean by the chart "compressing" itself? 

> 

> Gary Kercheck wrote: 

> 

> > Hello, 

> > 

> > I'm using Chart FX98 build 4.0.15.1 with VB 6.0 SP3.  I 

> > have a simple, 2 series strip chart which seems to be running 

> > fine with the exception that upon startup I seem to be unable 

> > to excorcise the "random" values that Chart FX populates 

> > the chart with during design time.  This is a data logging application 

> > where  I can't "throw away" values so I'm using an unlimited style 

> > real time chart.  However, I do set the number of values property 

> > to "20" in the Data/Behavior tab of the chart's design dialog so that 

> > the X axis has a preset width and doesn't automatically "compress" 

> > itself (which it did when I filled in "0" for this setting.) 

> > 

> > I've tried the following code (as well as the line that is commented 

> > out) to get rid of these values but they seem to have no effect: 

> > 

> >    frmMain.TempPlot.OpenDataEx COD_VALUES Or COD_REMOVE, 2, 20 

> >    frmMain.TempPlot.CloseData COD_VALUES 

> >    ' frmMain.TempPlot.ClearData (CD_INIVALUES) 

> > 

> > Any suggestions? 

> > 

> > Gary 

> > gkercheck@yahoo.com