A problem finding bar positions using multiple TBarSeries

[Johan Ingemansson]

Hi,

I have the following problem, I have an application where the user can calculate simple(1 TBarSeries) or grouped bar diagram(More then 1 TBarSeries), if simple then 1 TBarSeries is created and values are inserted. I also calculate a XX% Confidence intervall for each bar/value. I display the XX% CI with using a TBoxSeries, I manually set the median/Q1/Q3 to the value in the TBarSeries, to display the upper/lower limit in the CI, the whiskers in the TBoxSeries are used and given appropiate values. When I add the TBoxSeries, I set the TBoxSeries.Position = 0(for first bar/value), = 1 for second bar/value,.... and this works fine when I have 1 TBarSeries in the Chart.

The problem occurs when I have more then 1 TBarSeries, then the position isnt the same as with 1 TBarSeries(i.e first bar has position 0, and so on). So my question is, does anyone know how I can get the "position" for each of the bars displayed in the TChart when I have more then 1 TBarSeries?

I would really appreciate any ideas regarding this problem, Im hoping its really easy, and its just something I missed

Best Regards,

Johan Ingemansson

[Pep]

Hi Johan,

the BoxPlot Series has not been prepared to be displayed as a "Side" like Bar Series but a trick could be to use the following code to set the position of specific box :

Series4.Position:= XPosition + 2*(Series2.BarWidth / 100);

[Johan Ingemansson]

Hi agin,

Ive used the following to calculate the position of the TBoxSeries

Serie4.Position:=Chart.BottomAxis.CalcPosPoint(Chart.Series[0].CalcXPos(0)+Chart.Series[0] as TBarSeries).BarWidth div 2));

And I thought this worked nicely....but the strangest thing occured, when I have the case with for example 2 BarSeries(grouped) but only 1 value in each serie, then the expression above always returns 0... If anyone has any theory how this problem occurs I would be grateful...

Best Regards,

Johan Ingemansson

[Johan Ingemansson]

Hi again,

The problem mentioned above only happens if the TBoxSeries.Position is 0 before I make the calculation, if I change the position to for example 1 then the expression above doesnt return 0 and the boxseries are positioned corretly! But, the bars arent positioned in the center of the chart i.e its skewed...so I guess the trick is to "unskew" the chart, does anyone have any ideas to do this?

Best Regards,

Johan Ingemansson

[Johan Ingemansson]

Hi !

Ive studied the function CalcPosPoint, in TeEngine, as I see it the following expression : tmp:=tmp*IRange/IAxisSize, will always return 0 in the case when all grouped TBarSeries.Count = 1, since IRange will be 0(maximum=minimum), so to solve this Ive put Maximum = 0.5 and Minimum = -0.5, then It seems to work correclty. I would just like to confirm this hypothesis with anyone, otherwise this monolog will continue forever

Best Regards,

Johan Ingemansson

[Narcís]

Hi Johan,

You're right about what's wrong but we are not sure this is the best solution. I've added this defect (TV52011795) to our bug list to be reviewed for next releases.