private void Draw()
{
_pieSlices.Clear();
gridRotateTransform.CenterX = this.RenderSize.Width / 2;
gridRotateTransform.CenterY = this.RenderSize.Height / 2;
var startAngle = 0;
var color = BackgroundColor;
if (Slices != null)
{
foreach (var slice in Slices)
{
var sliceSize = 360 / Slices.Count();
var pieSlice = new PieSlice
{
StartAngle = startAngle,
Angle = sliceSize,
Radius = Size / 2,
BackgroundColor = color,
Label = slice,
ForegroundColor = ForegroundColor,
HideLabel = HideLabels,
};
_pieSlices.Add(pieSlice);
startAngle += sliceSize;
color = color.Lighten();
}
}
}
private void layoutRoot_ManipulationCompleted(object sender, ManipulationCompletedRoutedEventArgs e)
{
var angleFromYAxis = 360 - Angle;
SelectedItem = _pieSlices
.SingleOrDefault(p => p.StartAngle <= angleFromYAxis && (p.StartAngle + p.Angle) > angleFromYAxis);
var finalAngle = SelectedItem.StartAngle + SelectedItem.Angle / 2;
doubleAnimation.From = Angle;
doubleAnimation.To = 360 - finalAngle;
storyBoard.Begin();
Angle = 360 - finalAngle;
}
public RotaryWheel()
{
DataContext = this;
InitializeComponent();
Loaded += (sender, args) =>
{
Draw();
SelectedItem = _pieSlices.FirstOrDefault();
if (SelectedItem != null)
{
Angle = 360 - SelectedItem.Angle / 2;
}
};
_pieSlices.CollectionChanged += (sender, args) =>
{
switch (args.Action)
{
case NotifyCollectionChangedAction.Add:
foreach (PieSlice item in args.NewItems)
{
layoutSpinner.Children.Add(item);
}
break;
case NotifyCollectionChangedAction.Remove:
foreach (PieSlice item in args.OldItems)
{
layoutSpinner.Children.Remove(item);
}
break;
case NotifyCollectionChangedAction.Reset:
layoutSpinner.Children.Clear();
break;
}
};
}