Datasources and null points

Ashutosh · Post by **Ashutosh** » Tue Jan 27, 2009 9:48 am

Hi Narcis,
I have some more queries regarding the TeeChart Activex Control v8:
1. How can I add dataset as data source for the Chart.
2. If the series gets empty or null value for a data point, how can we show a gap in the line series.
To make it more clear let's say we have 10 ponits to draw a chart for the points 1 to 4 we have some data and point 5 is blank. in that case how can we show a gap on the line and resume from point 6 onwards. We are using fast line series.

Please help as soon as possible.
Thanks and regards
Ashutosh

Narcís · Post by **Narcís** » Tue Jan 27, 2009 11:05 am

Hi Ashustosh,

1. How can I add dataset as data source for the Chart.

You need to do as shown in Tutorial 8 - ADO Database access. Tutorials can be found at TeeChart's program group.

2. If the series gets empty or null value for a data point, how can we show a gap in the line series.
To make it more clear let's say we have 10 ponits to draw a chart for the points 1 to 4 we have some data and point 5 is blank. in that case how can we show a gap on the line and resume from point 6 onwards. We are using fast line series.

This can be achieved using new TreatNulls property as shown in the What's New?\New in Series\Fast Line TreatNulls example at the features demo, also available at TeeChart's program group.

Ashutosh · Post by **Ashutosh** » Fri Jan 30, 2009 5:05 am

Hi Narcis,

I have uploaded an image file here http://www.steema.net/upload/ which displays a sample chart with gaps for the null values data. How can I achieve the same. Kindly note that the chart in the image is TeeChart Activex control.

Let me know in case of any more clarifications needed.

Thanks and regards
Ashutosh

Post by **Yeray** » Fri Jan 30, 2009 8:18 am

Hi Ashustosh,

Having the property "IgnoreNulls" to false:

Code: Select all

TChart1.Series(0).asFastLine.IgnoreNulls = False

you should set the property "TreatNulls" as you wish. The property:

Code: Select all

TChart1.Series(0).asFastLine.TreatNulls

And the three possible values:

Code: Select all

tnDontPaint
tnSkip
tnIgnore

Ashutosh · Post by **Ashutosh** » Mon Feb 02, 2009 4:45 am

Hi Narcis, Yeray

This is to say you Thanks a lot for your support and suggestions. This has been relly great pleasure to work with such support which you provide.

Thanks and regards
Ashutosh Prasad

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