/// <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>
/// <returns>Return the top and left position of the label in the label area panel.</returns>
private void PositionAuto()
{
Chart chart = TreeHelper.FindAncestor <Chart>(this);
if (chart != null)
{
//PieChartLabelArea labelArea = chart.Template.FindName("LabelArea_PART", chart) as PieChartLabelArea;
PieChartLabelArea labelArea = TreeHelper.FindDescendent(chart, "LabelArea_PART") as PieChartLabelArea;
if (labelArea != null && labelArea.HasSmallArc)
{
this.PositionConnected();
}
else
{
this.PositionArcMidpoint();
}
}
}
/// <summary>
/// Adds the labels to each of its PieDataPoints.
/// </summary>
protected override void OnAfterUpdateDataPoints()
{
LabeledPieChart chart = this.SeriesHost as LabeledPieChart;
if (chart != null)
{
Panel labelArea = TreeHelper.FindDescendent(chart, "LabelArea_PART") as Panel;
if (labelArea != null && this.ItemsSource != null)
{
foreach (object dataItem in this.ItemsSource)
{
PieDataPoint pieDataPoint = this.GetDataPoint(dataItem) as PieDataPoint;
if (pieDataPoint != null)
{
this.AddLabelPieDataPoint(pieDataPoint, labelArea);
}
}
}
}
}
private static void IsLabeledPropertyChanged(DependencyObject obj, DependencyPropertyChangedEventArgs e)
{
bool isLabeled = (bool)e.NewValue;
if (isLabeled == true)
{
PieDataPoint pieDataPoint = obj as PieDataPoint;
if (pieDataPoint != null)
{
Chart chart = TreeHelper.FindAncestor <Chart>(pieDataPoint.Parent as DependencyObject);
if (chart != null)
{
//Panel labelArea = chart.Template.FindName("LabelArea_PART", chart) as Panel;
Panel labelArea = TreeHelper.FindDescendent(chart, "LabelArea_PART") as Panel;
if (labelArea != null)
{
AddLabel(pieDataPoint, labelArea);
}
}
}
}
}