Pie Chart - Connect Labels

[Roman]

Hello,

I have added a pie-chart to my report.  For each "pie-slice", I have added a label that appears just outside the slice.  This works fine.

However, I am unable to add a "connecting-line" from the pie-slice to its label.  Regardless of what code I add (in chart1_NeedDataSource), no LabelConnector appears.  Is there some problem connecting labels to "pie-slices" or am I doing something wrong?

Here is some of the code I use to make the connecting-line appear but nothing helps:

serie.Appearance.LabelAppearance.Visible = true;
serie.Appearance.LabelAppearance.LabelConnectorStyle.Visible = true;
serie.Appearance.ShowLabels = true;
serie.Appearance.LabelAppearance.LabelConnectorStyle.PenStyle = System.Drawing.Drawing2D.DashStyle.Solid;
serie.Appearance.LabelAppearance.LabelConnectorStyle.Width = 2;

 

Thanks in advance.

[Steve]

Hi Roman,

You need to set the visibility of the connectors in order to show them i.e.:

serie.Appearance.ShowLabelConnectors = true;

All the best,
Steve
the Telerik team

[Zhou]

Hi,I also have the problem!

I'm building a pie chart with 27 Series programmatically and having a few problems getting the labels to show the way I want.

            ChartSeries s = new ChartSeries();
            s.Type = ChartSeriesType.Pie;
            s.DefaultLabelValue = "#Y, (#%{#0.##%})";
            s.Appearance.ShowLabelConnectors = true;             
            s.Appearance.StartAngle = 30;             
            s.Appearance.LabelAppearance.Distance  = 60;
     otherwise the labels collide with each other.
some value is very samll,so the labels collide with each other . which isn't acceptable.
Also I can't get label connectors to work at all.
Am I missing something?

Thanks,
kany

[Steve]

Hi Kany,

Judging by your screenshot your problem is not the same as the label connectors are successfully rendered, but as discussed in other threads, when you have so many small values right next to each other, it is possible to have their labels overlap. Generally you can influence this behavior by setting the chart AutoLayout property to True. It makes sure that no chart elements overlap whenever possible.
Another thing to try is setting the IntelligentLabelsEnabled property to True, which should try to arrange them in a manner that they do not overlap with each other or with the pie.
Other things that you've already set but you can play with are increasing the distance between the pie and the labels (chart1.Series[i].Appearance.LabelAppearance.Distance property) and the StartAngle property (try bigger value so that labels are shared at right and bottom and not only at right of the plot area. In this line of thoughts, you might consider increasing the margin of the plot area in order to increase the space and accommodate all labels.

All the best,
Steve
the Telerik team