ChartTrackballBehavior and Data Loading

[Albert K]

Hi,

I have two questions. 

1) I am trying to add a ChartTrackballBehavior but it does not seems to display,  I have only one series.  Is it due to that?  

2) The series that I have consists of datetime and an integer value (the record is stored in SQLite which has a frequency every 5 minutes) .   I am loading the value for 24 hours duration.  It would take around 2-4 seconds for the activity to load.  Is there a way to lazy load?  Thanks.

 mychart = FindViewById<SfChart>(Resource.Id.myChart);

 mychart.Behaviors.Add(new ChartZoomPanBehavior() { ZoomMode= ZoomMode.X});

 mychart.Behaviors.Add(new ChartTrackballBehavior() { ShowLabel = true, ShowLine= true});

[Yuvaraj Palanisamy]

Hi Albert K, 

 

Thanks for contacting Syncfusion support. 

 

Query 1: “Regarding ChartTrackBallBehavior” 

We have prepared a sample for your requirement. You can press and hold to see the TrackBall and then pan to move to the next data points. Please find the sample from the below location. 

 

UG Link: https://help.syncfusion.com/xamarin-android/sfchart/trackball  

 

Sample : http://www.syncfusion.com/downloads/support/forum/125718/ze/ChartSample1158941595  

  

Query 2: “Regarding Data Loading”  

If you are using LineSeries, we suggest you to use FastLineSeries instead of LineSeries for better performance. Also please share the following details which will be helpful for further assistance on this. 

 

#1) Which series are you rendering? 

#2) How many data points to be loaded initially/dynamically? 

 

Please let us know if you have any concerns. 

 

Regards, 

Yuvaraj 

[Albert K]

Hi Albert K, 

 

Thanks for contacting Syncfusion support. 

 

Query 1: “Regarding ChartTrackBallBehavior” 

We have prepared a sample for your requirement. You can press and hold to see the TrackBall and then pan to move to the next data points. Please find the sample from the below location. 

 

UG Link: https://help.syncfusion.com/xamarin-android/sfchart/trackball  

 

Sample : http://www.syncfusion.com/downloads/support/forum/125718/ze/ChartSample1158941595  

  

Query 2: “Regarding Data Loading”  

If you are using LineSeries, we suggest you to use FastLineSeries instead of LineSeries for better performance. Also please share the following details which will be helpful for further assistance on this. 

 

#1) Which series are you rendering? 

#2) How many data points to be loaded initially/dynamically? 

 

Please let us know if you have any concerns. 

 

Regards, 

Yuvaraj 

Query1:  I forget to mention that I am using splineseries as the top chart with DateTimeRangeNavigator, does it make a difference?

Query2: For the 24hrs that I am loading around  288 records initially.  Is there a way to pop  up the chart first then populate it with data.

Thank you.

[Yuvaraj Palanisamy]

Hi Albert K, 

 

We have prepared a sample as per your requirement. Please check and let us know if you are facing the issue with Trackball in this attached sample. If not, we kindly request you to update us the modified sample to reproduce the issue for helping your further. 

 

Sample: http://www.syncfusion.com/downloads/support/forum/125718/ze/ChartSample623232074  

  

Please let us know your if you need any clarifications. 

 

Regards, 

Yuvaraj 

[Albert K]

Hi,

Thanks it works.  Is it possible to reduce the time for the trackball to appear on screen.  I did not know that it took at least a 500ms of holding on the screen for it to appear.  Thank you again.

[Albert K]

Hi, 

After a few hours of trail and error.  I think I might find the cause of the slowdown in loading the activity.  It seems that if i set interval = 5 then it would slowdown the loading of the activity.  Is that a bug?  Thank you.

            DateTimeAxis dateTimeAxis = new DateTimeAxis() { IntervalType = DateTimeIntervalType.Minutes, Interval = 5 };

            dateTimeAxis.Visibility = axisVisibility;

            dateTimeAxis.LabelStyle.LabelFormat = "h:mm"; 

            dateTimeAxis.ShowMajorGridLines = axisVisibility == Visibility.Visible ? true : false;

            chart.PrimaryAxis = dateTimeAxis;

[Yuvaraj Palanisamy]

Hi Albert K,  

 

Query : Regarding Trackball  

 

We have prepared a sample as per your requirement. Please find the sample from the below location. 

 

Query : Regarding DateTimeInterval 

 

We are not able to reproduce your reported issue at our end. Please check and let us know if you are facing the issue with DateTimeInterval in this attached sample. If not, we kindly request you to update us the modified sample to reproduce the issue and Syncfusion Essential Studio version for helping your further. 

 

Sample:  http://www.syncfusion.com/downloads/support/forum/125718/ze/ChartSample-1057940474  

    

Please let us know your if you need any clarifications.  

  

Regards,  

Yuvaraj