/// <summary>
/// When the HasSmallArc DO is set, all labels should be re-arranged.
/// </summary>
private static void HasSmallArcPropertyChanged(DependencyObject obj, DependencyPropertyChangedEventArgs e)
{
PieChartLabelArea labelArea = obj as PieChartLabelArea;
if (labelArea != null)
{
foreach (PieChartLabel label in labelArea.Children.OfType <PieChartLabel>())
{
label.InvalidateArrange();
}
}
}
/// <summary>
/// If at least one arc is small, all labels are displayed connected by a line. Otherwise, they're positioned
/// in the arc midpoint.
/// </summary>
private void PositionAuto()
{
Chart chart = TreeHelper.FindAncestor <Chart>(this);
if (chart != null)
{
PieChartLabelArea labelArea = chart.Template.FindName("LabelArea_PART", chart) as PieChartLabelArea;
if (labelArea != null && labelArea.HasSmallArc)
{
this.PositionConnected();
}
else
{
this.PositionArcMidpoint();
}
}
}