Dealing with Nil value in series

[Jeffrey]

I'd like to show a gap in a line and area series. I'm able to assign nil to the y value of a TKChartDataPoint but when generating the chart, I receive a run time error. To get around, I'm simply using 0, however, that significantly changes the chart. I'd rather simply have a gap where the value is nil.

Is this possible with the Telerik iOS controls?

[Adrian]

Hello Jeffrey,

Thank you for contacting us.

Currently TKChart does not support empty values. This is a must have feature and we will implement it one of our upcoming releases. It is logged also in our feedback portal as a feature request. Feel free to vote/comment.
One option to work around the issue is creating 2 line series instead of assigning 0 to the data point y value. Consider the code snippet below:

NSMutableArray *items = [[NSMutableArray alloc] init];
[chart beginUpdates];
for (int i = 0; i < dataPoints.count; i++) {
    TKChartDataPoint *point = (TKChartDataPoint *)dataPoints[i];
    if (point.dataYValue == nil) {
        TKChartLineSeries *series = [[TKChartLineSeries alloc] initWithItems:items];
        [chart addSeries:series];
        items = [[NSMutableArray alloc] init];
    }
    else {
        [items addObject:point];
    }

    if (i == dataPoints.count - 1 && items.count > 0) {
        TKChartLineSeries *series = [[TKChartLineSeries alloc] initWithItems:items];
         [chart addSeries:series];
    }
}
[chart endUpdates];

i hope this helps. If you have further questions I will be glad to assist you.

Regards,
Adrian
Telerik

 

 

[Aravinth]

If I had all the values for a given data set,
it'd look like this:
1----2----3----4----5

 *in case missing the 3rd value
yourSolution:
1----2            4----5
        \           /
         \         /
         
Ideally, what i'm looking for
1----2---------4----5

[Adrian]

Hello Aravinth,

Thank you for contacting us.

To achieve the described scenario you should filter your data points array removing the data points that have nil value for their y value. This can be done easily by using a predicate. Please consider the code snippet below:

NSPredicate *predicate = [NSPredicate predicateWithFormat:@"dataYValue != nil"];
NSArray *items = [dataPoints filteredArrayUsingPredicate:predicate];

TKChartLineSeries *series = [[TKChartLineSeries alloc] initWithItems:items];

I hope this helps. Do not hesitate to contact us in case you need further assistance.

Regards,
Adrian
Telerik