private double GetPercentage(PieChartItem item)
{
double sum = EnumerateItems().Sum(i => i.Value);
double value = item.Value;
return((value / sum) * 100);
}
protected override DependencyObject GetContainerForItemOverride()
{
PieChartItem item = new PieChartItem();
if (!String.IsNullOrEmpty(ValuePath))
{
item.SetBinding(PieChartItem.ValueProperty, new Binding()
{
Path = new PropertyPath(ValuePath)
});
}
if (!String.IsNullOrEmpty(ForegroundPath))
{
item.SetBinding(PieChartItem.ForegroundProperty, new Binding()
{
Path = new PropertyPath(ForegroundPath)
});
}
if (!String.IsNullOrEmpty(LabelPath))
{
item.SetBinding(PieChartItem.LabelProperty, new Binding()
{
Path = new PropertyPath(LabelPath)
});
}
return(item);
}
protected override void PrepareContainerForItemOverride(DependencyObject element, object dataItem)
{
PieChartItem item = element as PieChartItem;
if (item != null)
{
item.LabelTemplate = ItemTemplate;
}
}
private IEnumerable <PieChartItem> EnumerateItems()
{
for (int i = 0; i < Items.Count; i++)
{
PieChartItem item = Items[i] as PieChartItem;
if (item == null)
{
item = (PieChartItem)ContainerFromIndex(i);
}
if (item != null)
{
yield return(item);
}
}
}
private static void OnLabelChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
{
PieChartItem item = (PieChartItem)d;
if (item.Label != null && item.LabelTemplate != null)
{
throw new NotSupportedException("PieChartItem, set Label or LabelTemplate, not both.");
}
if (item.Label != null || item.LabelTemplate != null)
{
item.labelPanel.Visibility = Visibility.Visible;
}
else
{
item.labelPanel.Visibility = Visibility.Collapsed;
}
if (item.Label != null)
{
item.label.Content = item.Label;
}
}
private static void OnValueChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
{
PieChartItem pc = (PieChartItem)d;
pc.NotifyUpdate();
}