public object Convert( object value, Type targetType, object parameter, System.Globalization.CultureInfo culture )
{
double current = (Double.Parse(value.ToString()) / (double)100) * (double)360;
current = current - 90;
current = current * 0.017453292519943295;
double x = 10 + 10 * Math.Cos( current );
double y = 10 + 10 * Math.Sin( current );
return new Point( x, y );
}