Steema Central

Posted: **Wed Jul 29, 2009 2:32 pm**

BUGHi,

Please could someone advise how I might go about the following.

I have a line series to which I add points like so:

Dim series As New Steema.TeeChart.Styles.Line
series.Add(DateTime, Value, Colour)

The result is as shown in image1 below.

: image1; image1.gif (2.02 KiB) Viewed 9252 times

What I'd like to do is not paint a line between points if the time interval between subsequent points is greater than a certain value. See image2 (which was created using an image editor).

: image2; image2.gif (1.97 KiB) Viewed 9253 times

Note that a line is not drawn between the 7th and 8th points because the time difference is greater than x no. of minutes (Note however that both points are visible).

I've had a look at some examples that deal with null values but its not quite the same? The time interval between points can vary and aren't as regular as I've shown in my examples.

I know how to work out the time difference between points as I loop through them and add them to the chart - I'm just not sure on how to customize the connecting line.

Thanks,

Norman

Posted: **Thu Jul 30, 2009 9:16 am**

Hello Norman,

I will suggest 3 possible solutions, for solve your issue.

1.- You could add a new series for each grap that you have.

2.- Added points regularly, and there are some points haven't value, put the point trasparent or null.

3.- Once added data, search where there are graps in series and added one point null in the middle of grap, because to be as you would like.

I hope will helps.

Thanks,

Posted: **Tue Aug 04, 2009 8:42 am**

Hi Sandra,

Thanks for the reply and the suggestions - much appreciated. The first two possibilities aren't really options really because I foresee a lot of problems with introducing additional series (e.g. with legend etc. I also have functionality that is linked to series - like clicking on points etc. and keeping track of all these mini-series would get complicated I'm sure). I can't add points regularly either - as I mentioned there isn't a predeterminable pattern to the points. I may be able to do something with option 3, however, I'm wondering would changing from a line series to some other series (e.g. point?) provide me with other options?

Thanks again,

Norman

Posted: **Tue Aug 04, 2009 3:26 pm**

Hi,

I've noticed something when attempting to do as you describe. The code below will result in a gap between the 3rd and 4th point in the series (where there is a gap of 2 days) as desired. However, if you position the mouse over the points a tooltip will not appear over the 3rd point. Is this a bug or is it by design (althought can't see why as there is 10 non-null points on the chart).

Code: Select all

Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load

   Dim ch As Steema.TeeChart.Chart = WebChart1.Chart
   ch.Aspect.View3D = False

   Dim seriesHotspotTool As New Steema.TeeChart.Tools.SeriesHotspot(ch)
   seriesHotspotTool.HelperScript = Steema.TeeChart.Tools.HotspotHelperScripts.Annotation
   seriesHotspotTool.HotspotCanvasIndex = 499
   seriesHotspotTool.MapAction = Steema.TeeChart.Styles.MapAction.Script
   seriesHotspotTool.MapElements = ""
   AddHandler seriesHotspotTool.GetHTMLMap, AddressOf hotspot_GetHTMLMap

   Dim lineSeries As New Steema.TeeChart.Styles.Line
   lineSeries.Color = Drawing.Color.Black
   lineSeries.ColorEachLine = False
   lineSeries.Pointer.Visible = True
   lineSeries.Pointer.Style = Steema.TeeChart.Styles.PointerStyles.Circle
   lineSeries.Pointer.HorizSize = 2
   lineSeries.Pointer.VertSize = 2

   lineSeries.Add(Now.AddDays(-1), 1)
   lineSeries.Add(Now.AddDays(-2), 2)
   lineSeries.Add(Now.AddDays(-3), 3) ' tooltip will not appear for this point
   lineSeries.Add(Now.AddDays(-5), 5)
   lineSeries.Add(Now.AddDays(-5), vbNull, Drawing.Color.Transparent)
   lineSeries.Add(Now.AddDays(-6), 6)
   lineSeries.Add(Now.AddDays(-7), 7)
   lineSeries.Add(Now.AddDays(-8), 8)
   lineSeries.Add(Now.AddDays(-9), 9)
   lineSeries.Add(Now.AddDays(-10), 10)
   ch.Series.Add(lineSeries)

End Sub

Private Sub hotspot_GetHTMLMap(ByVal sender As Steema.TeeChart.Tools.SeriesHotspot, ByVal e As Steema.TeeChart.Tools.SeriesHotspotEventArgs)

   Dim XVal As String = e.PointPolygon.Title
   XVal = Date.FromOADate(e.Series.XValues.Value(e.PointPolygon.ValueIndex)).ToString("MM/dd/yyyy HH:mm:ss")

   e.PointPolygon.Title = "Date/Time: " & XVal & vbCrLf & _
   "Value: " & e.Series.YValues.Value(e.PointPolygon.ValueIndex).ToString()

End Sub

Thanks,

Norman

Posted: **Wed Aug 05, 2009 11:09 am**

Hello norman,

Is this a bug or is it by design (althought can't see why as there is 10 non-null points on the chart).

I could reproduce your issue, and I think that is a bug for TeeChartFor .Net with WebForms, because in WinForms this not occurs using Mark Tips Tool . I added this, in Bug Report list with numer [TW77014337 ]. We will try to fix it for next versions of TeeChart .NET.

Thanks,

Posted: **Wed Aug 05, 2009 11:14 am**

Many thanks - I look foward to the fix.

Steema Central

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