Point in time events

[TheRoadrunner]

Hi all,

being a TeeChart newbie, I'm not sure how to solve this one:

I have a Chart with a number of TLineSeries representing data logged at a given interval. The X-axis represents time obviously.
Asynchronus to this logging, some events might happen that should be represented on the same X-axis. The text describing the event could be a hint when the mouse hovers over each point, or even printed next to the points.
I tried adding a TPointSeries, where I can add events at different X-values (times), but this approach has (at least) two backsides:
1) I would like to avoid the events-series to show up in the legend.
2) The Label added with TPointSeries.AddXY(Time, 0, 'Label') is put on the X-axis instead of the date/time info that used to be there.

Any ideas ?

TIA

Søren

[Narcís]

Hi Søren,

1) I would like to avoid the events-series to show up in the legend.

This can be easily solved using this:

Code: Select all

  Series1.ShowInLegend:=false;

2) The Label added with TPointSeries.AddXY(Time, 0, 'Label') is put on the X-axis instead of the date/time info that used to be there.

Try forcing your bottom axis to display series values using this:

Code: Select all

  Chart1.Axes.Bottom.LabelStyle:=talValue;

[TheRoadrunner]

Hi Narcis

Thanks a lot for your quick response, that worked fine.

Do you have a suggestion for showing the label text (which is now showed as a tip) next to the point, or would that be annotations ?

/Søren

[Narcís]

Hi Søren,

Have you tried making series marks visible?

Code: Select all

  Series1.Marks.Visible:=true;

[TheRoadrunner]

Hi Narcis,

Yes, that shows the marks (obviously - stupid me).
But the mark text then hides the point, can i offset it relative to the point?

Best
Søren

[Narcís]

Hi Søren,

Yes, this can be done setting arrow's length:

Code: Select all

  Series1.Marks.ArrowLength:=20; 

Notice that negative values for ArrowLength are also supported.

Or another option is setting custom marks position as shown here.

[TheRoadrunner]

Thank you VERY much Narcis

Kind regards

Søren