Customizing Series

[Anthony]

Hi,

Two questions about customizing series:
1) is it possible that not each data point on my series shows up with a pointer, but let's say each 10th data point; the problem is that I have large series of length of 400, so I only see the pointers and no line; is there some increment for pointers ??

2) normally the data points are connected with straight lines; is it possible to present the series as a collection of points; I can realize that by means of the TeeChart Editor, but how to do that in run time ??

Some help would be nice.

Thanks a lot.

Kind regards,
Antoon Koster
WL| Delft Hydraulics
Netherlands

[Marjan]

Hi.

Re #1 : Yes, it can be done. You can use series GetPointerStyle event to filter series pointers. Example

Code: Select all

    private void line1_GetPointerStyle(Steema.TeeChart.Styles.CustomPoint series, Steema.TeeChart.Styles.CustomPoint.GetPointerStyleEventArgs e)
    {
      // Diplay only every 10th pointer
      if (e.ValueIndex % 10 != 0) e.Style = Steema.TeeChart.Styles.PointerStyles.Nothing;
      else e.Style = Steema.TeeChart.Styles.PointerStyles.Circle;
    }

Re #2 : Simply use point series instead of line series. Or hide line series connecting pen by setting lineseries Brush.Visible and LinePen.Visible properties to false:

Code: Select all

line1.Brush.Visible = false;
line1.LinePen.Visible = false;

[Anthony]

Hi,

Thanks for your quick reply.

I just tried your second example, and tried to hide drawing the lines, by means of

line1.Brush.Visible = false;
line1.LinePen.Visible = false;

but TeeChart still draws the lines in between the data points. Strange ..

The complete code looks like this:
Steema.TeeChart.Styles.Line line;
int iSeries=0;
for (int iPar=0;iPar<noPars;iPar++)
{
for (int iLoc=0;iLoc<noLocs;iLoc++)
{
DateTime[] xValues = new DateTime[noTimes];
float[] yValues = new float[noTimes];
line = new Steema.TeeChart.Styles.Line();
line.CustomVertAxis = customAxis[iPar];
// populating series
line.XValues.DateTime = true;
line.Marks.Visible = marksVisible;
line.Pointer.Visible = pointersVisible;
line.Pointer.Style = pointerStyles[iPar];
line.Pointer.VertSize = 3;
line.Color = lineColors[iSeries];
int iWidth = Math.Max(1,iSeries/this.maxColors+1);
line.LinePen.Width = iWidth;
line.Brush.Visible = false;
line.LinePen.Visible = false;
tChart1.Series.Add(line);
DateTime start = new DateTime();
for (int iTime=0;iTime<noTimes;iTime++)
{
xValues[iTime] = dateTimes[iTime];
yValues[iTime] = gsSeries[iPar,iLoc,iTime];
}
tChart1.Series[iSeries].Add(xValues,yValues);
tChart1.Series[iSeries].Title =
gsParameters[iPar] + gsLocations[iLoc];
tChart1.BackColor = Color.White;
iSeries++;
}
}
noSeries = iSeries;

Any idea what's going wrong ??

Thanks,
Antoon Koster
WL|Delft Hydraulics
Netherlands

[Pep]

Hi Antoon,

are you using the latest Build available on our web site (at the private customers download page ) ?
Using the following code works fine here.

Code: Select all

private void Form1_Load(object sender, System.EventArgs e)
{
	Steema.TeeChart.Styles.Line line1 = new Steema.TeeChart.Styles.Line();
	line1.FillSampleValues();
	line1.Pointer.Visible =true;
	line1.LinePen.Visible =false;
	line1.Brush.Visible = false;
	tChart1.Series.Add(line1);
}

[Anthony]

Hi,

Thanks for your hints, but I think I am missing some details.

If I change my series from tChart1.Series into

Steema.TeeChart.Styles.CustomPoint series;

then I see a method GetPointerStyle().

Do I have to add an event, like
series.GetPointerStyle += new <event handler> <line1_GetPointerStyle).

Is that the way to do that ?

And last question, how can I connect that custom series to my chart. With *normal* series I use tChart1.Series, but how does that work for custom series.

Thanks a lot.
Anthony,
Wl|Delft Hydraulics
Netherlands

[Pep]

Hi Anthony,

yes, you can find one example which shows how to use this event in the Demo Features project included with the installation. Do a search for "pointer style event".