private void BuildIndividualTrackInfos(ChartDataContext context)
{
int index = 0;
List <DataPointInfo> infos = new List <DataPointInfo>(context.DataPoints);
infos.Sort(new DataPointInfoYComparer());
foreach (DataPointInfo info in infos)
{
ContentPresenter presenter;
if (this.individualTrackInfos.Count > index)
{
presenter = this.individualTrackInfos[index];
presenter.Visibility = Visibility.Visible;
}
else
{
presenter = new ContentPresenter();
this.individualTrackInfos.Add(presenter);
this.chart.adornerLayer.Children.Add(presenter);
}
presenter.Content = info;
presenter.ContentTemplate = GetTrackInfoTemplate(info.Series);
index++;
}
while (index < this.individualTrackInfos.Count)
{
this.individualTrackInfos[index].Visibility = Visibility.Collapsed;
index++;
}
}
private void UpdateTrackInfo(ChartDataContext context)
{
if (!this.showInfo)
{
return;
}
// arrange the track content
if (this.lineControl.Line.Points.Count == 0)
{
Debug.Assert(false, "Must have line points initialized.");
return;
}
TrackBallInfoEventArgs args = new TrackBallInfoEventArgs(context);
if (this.TrackInfoUpdated != null)
{
this.TrackInfoUpdated(this, args);
}
if (this.infoMode == TrackInfoMode.Multiple)
{
this.trackInfoControl.Update(args);
}
else
{
this.BuildIndividualTrackInfos(context);
}
}
private void UpdateVisuals()
{
ChartDataContext context = this.GetDataContext(this.position, true);
if (context.ClosestDataPoint != null)
{
var point = context.ClosestDataPoint.DataPoint as CategoricalDataPoint;
if (point != null)
{
List <DataPointInfo> points = null;
if (point.Category == null)
{
points = context.DataPoints.Where(c => c.DataPoint is CategoricalDataPoint &&
((CategoricalDataPoint)c.DataPoint).Category == null).ToList();
}
else
{
// select points only with the same category. TODO: Refactor this.
points = context.DataPoints.Where(c =>
c.DataPoint is CategoricalDataPoint &&
point.Category.Equals(((CategoricalDataPoint)c.DataPoint).Category)
).ToList();
}
context = new ChartDataContext(points, context.ClosestDataPoint);
}
}
this.UpdateLine(context);
this.UpdateIntersectionPoints(context);
this.UpdateTrackInfo(context);
}
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 object OnContextNeeded(ChartDataContext defaultContext)
{
EventHandler <TooltipContextNeededEventArgs> handler = this.ContextNeeded;
if (handler == null)
{
return(defaultContext.ClosestDataPoint);
}
TooltipContextNeededEventArgs args = new TooltipContextNeededEventArgs(defaultContext);
handler(this, args);
return(args.Context != null ? args.Context : defaultContext.ClosestDataPoint);
}
internal ChartDataContext GetDataContext(Point physicalOrigin, ChartPointDistanceCalculationMode pointDistanceMode)
{
// The tool tip location has to be translated because the data points are laid out in a larger layout slot if there is a zoom factor.
// Also, the absolute value of the pan offset is used in the transformation because the pan offset is applied as a negative value to
// the visualization of the plot area in order to simulate pan behavior.
RadRect plotAreaClip = this.PlotAreaClip;
physicalOrigin.X += Math.Abs(plotAreaClip.Width * this.scrollOffsetCache.X);
physicalOrigin.Y += Math.Abs(plotAreaClip.Height * this.scrollOffsetCache.Y);
if (this.lastDataContext != null && this.lastDataContext.TouchLocation == physicalOrigin)
{
return(this.lastDataContext);
}
this.lastDataContext = this.GetDataContextCore(physicalOrigin, pointDistanceMode);
return(this.lastDataContext);
}
private void UpdateIntersectionPoints(ChartDataContext context)
{
if (!this.showIntersectionPoints)
{
return;
}
int index = 0;
Point plotOrigin = this.chart.PlotOrigin;
foreach (ContentPresenter presenter in this.intersectionPoints)
{
presenter.Visibility = Visibility.Collapsed;
}
foreach (DataPointInfo info in context.DataPoints)
{
DataTemplate template = GetIntersectionTemplate(info.Series);
if (template == null)
{
continue;
}
ContentPresenter presenter = this.GetIntersectionPointPresenter(index);
presenter.Visibility = Visibility.Visible;
presenter.Content = info;
presenter.ContentTemplate = template;
presenter.Measure(RadChartBase.InfinitySize);
Point center = info.DataPoint.Center();
Size desiredSize = presenter.DesiredSize;
Canvas.SetLeft(presenter, center.X - Math.Abs(plotOrigin.X) - (desiredSize.Width / 2));
Canvas.SetTop(presenter, center.Y - Math.Abs(plotOrigin.Y) - (desiredSize.Height / 2));
index++;
}
}
/// <summary>
/// Initializes a new instance of the <see cref="TrackBallInfoEventArgs"/> class.
/// </summary>
/// <param name="context">The context.</param>
public TrackBallInfoEventArgs(ChartDataContext context)
{
this.context = context;
}
/// <summary>
/// Initializes a new instance of the TooltipContextNeededEventArgs class.
/// </summary>
/// <param name="defaultContext">The default context which will be used if no new context is provided.</param>
public TooltipContextNeededEventArgs(ChartDataContext defaultContext)
{
this.DefaultContext = defaultContext;
}
private void UpdateLine(ChartDataContext context)
{
this.lineControl.Line.Points.Clear();
Point plotOrigin = this.chart.PlotOrigin;
if (this.snapMode == TrackBallSnapMode.AllClosePoints)
{
Point[] points = new Point[context.DataPoints.Count];
int index = 0;
foreach (DataPointInfo info in context.DataPoints)
{
Point center = info.DataPoint.Center();
center.X += plotOrigin.X;
center.Y += plotOrigin.Y;
points[index++] = center;
}
Array.Sort(points, new PointYComparer());
foreach (Point point in points)
{
this.lineControl.Line.Points.Add(point);
}
}
else if (this.snapMode == TrackBallSnapMode.ClosestPoint && context.ClosestDataPoint != null)
{
Point center = context.ClosestDataPoint.DataPoint.Center();
center.X += plotOrigin.X;
center.Y += plotOrigin.Y;
// Temporary fix for NAN values. Remove when the chart starts to support null values.
if (double.IsNaN(center.X))
{
center.X = 0;
}
if (double.IsNaN(center.Y))
{
center.Y = this.chart.chartArea.plotArea.layoutSlot.Bottom;
}
this.lineControl.Line.Points.Add(center);
}
RadRect plotArea = this.chart.chartArea.plotArea.layoutSlot;
Point topPoint;
Point bottomPoint;
if (this.lineControl.Line.Points.Count > 0)
{
topPoint = new Point(this.lineControl.Line.Points[0].X, plotArea.Y);
bottomPoint = new Point(this.lineControl.Line.Points[this.lineControl.Line.Points.Count - 1].X, plotArea.Bottom);
}
else
{
topPoint = new Point(this.position.X, plotArea.Y);
bottomPoint = new Point(this.position.X, plotArea.Bottom);
}
this.lineControl.Line.Points.Insert(0, topPoint);
this.lineControl.Line.Points.Insert(this.lineControl.Line.Points.Count, bottomPoint);
}