How to fix Size Piece of Doughnut?

[Watit]

I have test by simple code
http://dl.dropbox.com/u/50999266/Copy_of_317544_DoghnutChart.rar

            sampleData.Add(new DashboardChart("AGRO", 1, -1.5));
            sampleData.Add(new DashboardChart("CONSUMP", 1, 0.5));
            sampleData.Add(new DashboardChart("FINCIAL", 2, 1.2));
            sampleData.Add(new DashboardChart("INDUS", 2, 0.1));
            sampleData.Add(new DashboardChart("PROPCON", 3, -1.1));
            sampleData.Add(new DashboardChart("RESOURC", 3, 1.4));
            sampleData.Add(new DashboardChart("SERVICE", 4, 0.38));
            sampleData.Add(new DashboardChart("TECH", 4, -0.23));

If value of Price has less as (-) or same value  as 1.4, 1.5 
the dought has same position or same my attach picture

Please help to some solution to fix size of piece 
if value as 12.5 i think the postion is OK

    sampleData.Add(new DashboardChart("AGRO", 1, 12.5));
            sampleData.Add(new DashboardChart("CONSUMP", 1, 12.5));
            sampleData.Add(new DashboardChart("FINCIAL", 2, 12.5));
            sampleData.Add(new DashboardChart("INDUS", 2, 12.5));
            sampleData.Add(new DashboardChart("PROPCON", 3, 12.5));
            sampleData.Add(new DashboardChart("RESOURC", 3, 12.5));
            sampleData.Add(new DashboardChart("SERVICE", 4, 12.5));
            sampleData.Add(new DashboardChart("TECH", 4, 12.5)); 

[Watit]

I'm only Increase Parameter  Everything it's OK ^^

sampleData.Add(new DashboardChart("AGRO", 5, -1.0, 12.5));
sampleData.Add(new DashboardChart("CONSUMP", 6, 0, 12.5));
sampleData.Add(new DashboardChart("FINCIAL", 8, 2.02, 12.5));
sampleData.Add(new DashboardChart("INDUS", 7, 1.06, 12.5));
sampleData.Add(new DashboardChart("PROPCON", 8, 2.01, 12.5));
sampleData.Add(new DashboardChart("RESOURC", 4, -1.20, 12.5));
sampleData.Add(new DashboardChart("SERVICE", 5, -0.29, 12.5));
sampleData.Add(new DashboardChart("TECH", 3, -2.1, 12.5));

//And

m.ItemMappings.Add(new ItemMapping("Fixsize", DataPointMember.YValue));
m.ItemMappings.Add(new ItemMapping("Name", DataPointMember.XCategory));
m.SeriesDefinition.ItemLabelFormat = "#XCAT\n#DATAITEM.PercentChange%";

//Increase Parameter

public class DashboardChart
    {
        public string Name { get; set; }
        public int ID { get; set; }
        public double Fixsize { get; set; }
        public double PercentChange { get; set; }

        public DashboardChart(string name, int id, double percentChange, double fixsize)
        {
            Name = name;
            ID = id;
            Fixsize = fixsize;
            PercentChange = percentChange;

        }
    }

[Nikolay]

Hello Watit,

It appears that the issue you've encountered is caused by setting negative values for slices of the Doughnut chart, which is not supported by the control. If this is not the case and you continue experiencing the problematic behavior it would be very helpful for us if you're able to open a support ticket and send us a sample application demonstrating the issue,so that we can debug it locally and provide a solution.

Kind regards,
Nikolay
the Telerik team

[Watit]

This my test project.
You can Download Link bellow here
http://dl.dropbox.com/u/50999266/317544_DoghnutChart-20120312.rar

[Nikolay]

Hi Watit,

We have tested the attached application and the root cause for the issue from the original screenshot is that the Fixsize property, which you map to YValue has some negative values, this is why some of the slices overlap. When you set it to 12.5 or any other positive value, then the chart would work as expected, however, you cannot map negative values to the YValue of a Doughnut chart, as it is not supported. Setting any value for Fixsize for all data points, be it 12.5 or 1.1 would result in the same data visualization and would work correctly.

Regards,
Nikolay
the Telerik team

[Watit]

NikolayThank you.