Some Requests

AIS · Post by **AIS** » Fri Jul 11, 2008 7:40 am

Hello Narcís,

i have two requests for future releases of TChart.

1. The use of the pointstyle series in case with many values is confusing because they overlap each other. Is it possible to draw only points, which have not the same x and y pixel position of the screen? Is there already any way to prevent this issue?

2. The calculation of series (stddev, average or something like that) can occur a overflow of the used variables if there are many big values. Is it possible to give feedback for this case (Double.NaN or null)? Now it only tell its "0", that can confuse some users.

Thanks a lot!

Narcís · Post by **Narcís** » Fri Jul 11, 2008 9:06 am

Hi AIS,

1. The use of the pointstyle series in case with many values is confusing because they overlap each other. Is it possible to draw only points, which have not the same x and y pixel position of the screen? Is there already any way to prevent this issue?

This is already possible using FastLine series and its DrawAllPoints property as can be seen in the All Features\Welcome !\Chart styles\Standard\Fast Line\Fast Line Speed DrawAll example in the features demo, available at TeeChart's program group. I've added to implement the same property for Points series to the wish-list.

An alternative could be using the DownSampling function. You'll find examples at All Features\Welcome !\Functions\Extended\Reducing number of points in the features demo.

2. The calculation of series (stddev, average or something like that) can occur a overflow of the used variables if there are many big values. Is it possible to give feedback for this case (Double.NaN or null)? Now it only tell its "0", that can confuse some users.

Sorry but I don't understand which is the exact problem here. Would you be so kind to send us a simple example project we can run "as-is" to reproduce the problem here? You can either post your files at news://www.steema.net/steema.public.attachments newsgroup or at our upload page.

Thanks in advance.

AIS · Post by **AIS** » Fri Jul 11, 2008 10:11 am

Hi,

1: I already draw my DataSet with FatsLines, but some users want to see points too

The speed in that case i not really the problem, but the look is bad. I will try with DownSampling, but in zoom, the reduced points are not anymore visible.

2. There was a mistake on my part. Sorry.