private void createPieSegments()
{
foreach (var item in this.Children)
{
if (item is PieSegment)
{
var pieSegment = item as PieSegment;
if (pieSegment.DataItem is INotifyPropertyChanged)
((INotifyPropertyChanged)pieSegment.DataItem).PropertyChanged -= PieChartCanvas_PropertyChanged;
}
}
this.Children.Clear();
Items.Clear();
if (ParentPieChartControl.ItemsSource is IEnumerable)
{
var fillColourProvider = ParentPieChartControl.FillBrushProvider;
if (fillColourProvider == null)
fillColourProvider = new DefaultBrushProvider();
var items = (IEnumerable)ParentPieChartControl.ItemsSource;
Double lastAngle = 0;
Double total = 0;
foreach (var obj in items)
{
var value = GetValuePropertyValue(obj);
total += Math.Round(value, 2);
}
var centerPoint = new Point(this.ActualWidth / 2, this.ActualHeight / 2);
var outerRadius = ParentPieChartControl.OuterRadius;
if (outerRadius == 0)
{
if (this.ActualWidth > this.ActualHeight)
outerRadius = this.ActualHeight / 2;
else
outerRadius = this.ActualWidth / 2;
}
var innerRadius = ParentPieChartControl.InnerRadius;
int i = 0;
foreach (var obj in items)
{
var value = Math.Round(GetValuePropertyValue(obj), 2);
var text = GetDisplayTextPropertyValue(obj);
if (value > 0.0)
{
var percentage = value / total;
var angle = percentage * 360;
var brush = fillColourProvider.GetBrush(i, value, angle, obj);
PieDataItem item = new PieDataItem()
{
Value = value,
Percentage = percentage,
Text = text,
DataItem = obj,
FillBrush = brush
};
PieSegment p = new PieSegment()
{
CenterPoint = centerPoint,
Radius = outerRadius,
StartAngle = lastAngle,
EndAngle = lastAngle + angle,
Stroke = ParentPieChartControl.LineBrush,
Fill = brush,
InnerRadius = innerRadius,
StrokeThickness = 0,
ExplosionRadius = 15,
OffsetRadius = 0,
Value = value,
Percentage = percentage,
DataItem = obj,
Text = text
};
p.Tapped += pieSegment_Tapped;
Items.Add(item);
this.Children.Add(p);
if (obj is INotifyPropertyChanged)
((INotifyPropertyChanged)obj).PropertyChanged += PieChartCanvas_PropertyChanged;
lastAngle += angle;
i++;
}
}
}
ParentPieChartControl.setLegendItems(Items);
}
void raiseItemTappedEvent(PieSegment item)
{
var tmpEventHandler = ItemTapped;
if (tmpEventHandler != null)
ItemTapped(this, new ItemTappedEventArgs(item.DataItem));
}
