private static void OnClipToPlotAreaChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
{
ChartSeries series = d as ChartSeries;
series.InvalidateCore();
}
private static void OnIsSelectedBindingChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
{
ChartSeries series = d as ChartSeries;
series.dataSource.IsSelectedBinding = e.NewValue as DataPointBinding;
}
/// <summary>
/// Gets <see cref="ChartDataContext"/> associated with a gives physical location.
/// </summary>
/// <param name="tapLocation">The relative physical position of the requested data context.</param>
/// <param name="pointDistanceMode">The point distance calculation mode to be used in finding closest point.</param>
/// <returns>Returns <see cref="ChartDataContext"/> object holding information for the requested physical location.</returns>
protected virtual ChartDataContext GetDataContextCore(Point tapLocation, ChartPointDistanceCalculationMode pointDistanceMode)
{
List <DataPointInfo> closestPoints = new List <DataPointInfo>();
double totalMinDistance = double.PositiveInfinity;
DataPointInfo closestPoint = null;
foreach (ChartSeriesModel series in this.chartArea.Series)
{
if (!series.Presenter.IsVisible)
{
continue;
}
DataPointInfo currentClosestDataPoint = null;
double minDistance = double.PositiveInfinity;
ChartSeries visualSeries = series.presenter as ChartSeries;
foreach (DataPoint dataPoint in series.DataPointsInternal)
{
if (dataPoint.isEmpty)
{
continue;
}
double distance;
if (dataPoint.ContainsPosition(tapLocation.X, tapLocation.Y))
{
distance = 0;
}
else
{
distance = visualSeries.GetDistanceToPoint(dataPoint, tapLocation, pointDistanceMode);
}
if (distance < minDistance)
{
minDistance = distance;
if (currentClosestDataPoint == null)
{
currentClosestDataPoint = new DataPointInfo();
}
currentClosestDataPoint.DataPoint = dataPoint;
currentClosestDataPoint.SeriesModel = series;
}
if (distance < totalMinDistance)
{
totalMinDistance = distance;
closestPoint = currentClosestDataPoint;
if (distance == 0)
{
closestPoint.ContainsTouchLocation = true;
}
}
}
if (currentClosestDataPoint != null)
{
closestPoints.Add(currentClosestDataPoint);
}
}
return(new ChartDataContext(closestPoints, closestPoint)
{
TouchLocation = tapLocation
});
}
