Annotaions for Donut Chart

[Ankit]

Hello,

 

I want to know that which annotation can be best viewed on donut chart.

Also how to display the annotation at the point of tap or point of slice of donut chart.

 

Thanks,

Ankit

[Adrian]

Hi Ankit,

Thank you for contacting us.

The annotations in TKChart are designed to work with cartesian chart and shouldn't be used with pie or donut chart. Instead you should use point labels. To enable point labels for your donut series you should set the textHidden property of TKChartPointLabelStyle to NO. Please consider the code snippet below:

donut.style.pointLabelStyle.textHidden = NO;

If you need to change the text of your label you should implement the chart:textForLabelAtPoint:inSeries:atIndex: method of TKChartDelegate and return the text for the corresponding label:

- (NSString *)chart:(TKChart *)chart textForLabelAtPoint:(id<TKChartData>)dataPoint inSeries:(TKChartSeries *)series atIndex:(NSUInteger)dataIndex
{
    return @"label text";
}

I hope this helps. Should you have further questions do not hesitate to contact us.

Regards,
Adrian
Telerik

 

 

[Enrique]

Hi, if I need to change the Label for a Point label when is selected but I have implemented the LabelForDataPoint method. How can I indicate that only show my custom Text but only when is selected-

[Adrian]

Hi, Enrique,

Currently TKChart does not support editing separate point labels. This is already logged in our feedback portal. You can follow the status of the feature request there.

Regards,
Adrian
Telerik