private void DisplayBalloon(Slice slice, Point position) {
balloon.Visibility = Visibility.Visible;
balloon.Measure(new Size(canvasBorder.ActualWidth, canvasBorder.ActualHeight));
double balloonLeft = position.X - balloon.DesiredSize.Width / 2;
if (balloonLeft < 0) {
balloonLeft = position.X;
} else if (balloonLeft + balloon.DesiredSize.Width > canvasBorder.ActualWidth) {
balloonLeft = position.X - balloon.DesiredSize.Width;
}
double balloonTop = position.Y - balloon.DesiredSize.Height - 5;
if (balloonTop < 0) {
balloonTop = position.Y + 17;
}
balloon.SetValue(Canvas.LeftProperty, balloonLeft);
balloon.SetValue(Canvas.TopProperty, balloonTop);
balloon.Text = slice.Title;
}
private void AddSlices() {
for (int i = slices.Count; i < values.Count; i++) {
Slice slice = new Slice();
slice.RenderTransform = new RotateTransform();
slice.RenderTransformOrigin = new Point(0, 0);
slices.Add(slice);
slice.ManipulationStarted += new EventHandler<ManipulationStartedEventArgs>(OnSliceManipulationStarted);
AddSliceToCanvas(slice);
}
}
private void AddSliceToCanvas(Slice slice) {
if (canvas != null && !canvas.Children.Contains(slice)) {
canvas.Children.Add(slice);
}
}
private void RemoveSliceFromCanvas(Slice slice) {
if (canvas != null && canvas.Children.Contains(slice)) {
canvas.Children.Remove(slice);
}
}