private object GetTooltipContext(Point location)
{
ChartDataContext defaultContext = this.GetDataContext(location, true);
this.closestDataPointInfo = defaultContext.ClosestDataPoint;
if (this.closestDataPointInfo != null && this.closestDataPointInfo.DataPoint.Presenter != null)
{
var template = GetContentTemplate(this.closestDataPointInfo.DataPoint.Presenter as ChartSeries);
if (template != null)
{
this.toolTipContent.ContentTemplate = template;
}
if (template == null)
{
template = GetContentTemplate(this);
this.toolTipContent.ContentTemplate = template;
}
if (template == null)
{
this.toolTipContent.ClearValue(ContentControl.ContentTemplateProperty);
}
}
return(this.OnContextNeeded(defaultContext));
}
private void ArrangeIndividualTrackInfos()
{
int index = 0;
Point plotOrigin = this.chart.PlotOrigin;
foreach (ContentPresenter presenter in this.individualTrackInfos)
{
if (presenter.Visibility == Visibility.Collapsed)
{
continue;
}
DataPointInfo info = presenter.Content as DataPointInfo;
RadRect layoutSlot = info.DataPoint.layoutSlot;
Size size = presenter.DesiredSize;
HorizontalAlignment horizontalAlign = index % 2 == 0 ? HorizontalAlignment.Left : HorizontalAlignment.Right;
double x = 0;
switch (horizontalAlign)
{
case HorizontalAlignment.Left:
x = layoutSlot.X - size.Width;
break;
case HorizontalAlignment.Center:
x = layoutSlot.Center.X - size.Width / 2;
break;
case HorizontalAlignment.Right:
x = layoutSlot.Right;
break;
}
double y = layoutSlot.Center.Y - size.Height / 2;
Canvas.SetLeft(presenter, x + plotOrigin.X);
Canvas.SetTop(presenter, y + plotOrigin.Y);
index++;
}
}
internal ChartDataContext(List <DataPointInfo> infos, DataPointInfo closestPoint)
{
this.DataPoints = infos;
this.ClosestDataPoint = closestPoint;
}
/// <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
});
}
