/// <summary>
/// Updates the data point's visual representation.
/// </summary>
/// <param name="dataPoint">The data point.</param>
protected override void UpdateDataPoint(DataPoint dataPoint)
{
double maximumDiameter = Math.Min(PlotAreaSize.Width, PlotAreaSize.Height) * MaximumBubbleSizeAsRatioOfSmallestDimension;
BubbleDataPoint bubbleDataPoint = (BubbleDataPoint)dataPoint;
double ratioOfLargestBubble =
(MaxOfDataPointActualSizeValues.HasValue && MaxOfDataPointActualSizeValues.Value != 0.0 && bubbleDataPoint.ActualSize >= 0.0) ? Math.Abs(bubbleDataPoint.ActualSize) / MaxOfDataPointActualSizeValues.Value : 0.0;
bubbleDataPoint.Width = ratioOfLargestBubble * maximumDiameter;
bubbleDataPoint.Height = ratioOfLargestBubble * maximumDiameter;
// Call UpdateLayout to ensure ActualWidth/ActualHeight are correct
if (bubbleDataPoint.ActualWidth == 0.0 || bubbleDataPoint.ActualHeight == 0.0)
{
bubbleDataPoint.UpdateLayout();
}
double left =
(ActualIndependentRangeAxis.GetPlotAreaCoordinate((IComparable)bubbleDataPoint.ActualIndependentValue))
- (bubbleDataPoint.Width / 2.0);
double top =
(PlotAreaSize.Height
- (bubbleDataPoint.Height / 2.0))
- ActualDependentRangeAxis.GetPlotAreaCoordinate((IComparable)bubbleDataPoint.ActualDependentValue);
if (ValueHelper.CanGraph(left) && ValueHelper.CanGraph(top))
{
Canvas.SetLeft(bubbleDataPoint, left);
Canvas.SetTop(bubbleDataPoint, top);
}
}
/// <summary>
/// Prepares a bubble data point by binding the size value binding to
/// the size property.
/// </summary>
/// <param name="dataPoint">The data point to prepare.</param>
/// <param name="dataContext">The data context of the data point.
/// </param>
protected override void PrepareDataPoint(DataPoint dataPoint, object dataContext)
{
base.PrepareDataPoint(dataPoint, dataContext);
BubbleDataPoint bubbleDataPoint = (BubbleDataPoint)dataPoint;
bubbleDataPoint.SetBinding(BubbleDataPoint.SizeProperty, SizeValueBinding ?? DependentValueBinding ?? IndependentValueBinding);
}
/// <summary>
/// Detaches size change and actual size change event handlers from the
/// data point.
/// </summary>
/// <param name="dataPoint">The data point.</param>
protected override void DetachEventHandlersFromDataPoint(DataPoint dataPoint)
{
BubbleDataPoint bubbleDataPoint = (BubbleDataPoint)dataPoint;
bubbleDataPoint.SizePropertyChanged -= new RoutedPropertyChangedEventHandler <double>(BubbleDataPointSizePropertyChanged);
bubbleDataPoint.ActualSizePropertyChanged -= new RoutedPropertyChangedEventHandler <double>(BubbleDataPointActualSizePropertyChanged);
base.DetachEventHandlersFromDataPoint(dataPoint);
}
/// <summary>
/// SizeProperty property changed handler.
/// </summary>
/// <param name="d">BubbleDataPoint that changed its Size.</param>
/// <param name="e">Event arguments.</param>
private static void OnSizePropertyChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
{
BubbleDataPoint source = (BubbleDataPoint)d;
double oldValue = (double)e.OldValue;
double newValue = (double)e.NewValue;
source.OnSizePropertyChanged(oldValue, newValue);
}
/// <summary>
/// Animates the value of the ActualSize property to the size property
/// when it changes.
/// </summary>
/// <param name="sender">The source of the event.</param>
/// <param name="e">Information about the event.</param>
private void BubbleDataPointSizePropertyChanged(object sender, RoutedPropertyChangedEventArgs <double> e)
{
BubbleDataPoint dataPoint = (BubbleDataPoint)sender;
DependencyPropertyAnimationHelper.BeginAnimation(
dataPoint,
BubbleDataPoint.ActualSizeProperty,
"ActualSize",
e.NewValue,
TransitionDuration);
}