public static IEnumerable <Point> GetSplinePointsConnectingAbsoluteFirstLastDataPoints(IList <DataPoint> dataPoints, double scaleFactor)
{
DataPoint firstPoint = dataPoints[0];
DataPoint lastPoint = dataPoints[dataPoints.Count - 1];
if (firstPoint.isEmpty || double.IsNaN(firstPoint.CenterX()) || double.IsNaN(firstPoint.CenterY()) ||
lastPoint.isEmpty || double.IsNaN(lastPoint.CenterX()) || double.IsNaN(lastPoint.CenterY()))
{
yield break;
}
double tolerance = DefaultTolerance;
if (scaleFactor > 2)
{
tolerance *= (int)scaleFactor / 2;
}
DataPoint previousSignificantPointBeforeAbsoluteLast = FindPreviousNonEmptyPointBeforeAbsoluteLast(dataPoints);
DataPoint nextSignificantPointAfterAbsoluteFirst = FindNextNonEmptyPointAfterAbsoluteFirst(dataPoints);
// return the first point since spline segmentation skips it
yield return(lastPoint.Center());
foreach (Point point in Segment(previousSignificantPointBeforeAbsoluteLast.Center(), lastPoint.Center(), firstPoint.Center(), nextSignificantPointAfterAbsoluteFirst.Center(), tolerance))
{
yield return(point);
}
}
protected virtual void ConnectFirstLastDataPoints()
{
DataPoint firstPoint = this.renderPoints[0];
DataPoint lastPoint = this.renderPoints[this.renderPoints.Count - 1];
if (firstPoint.isEmpty || lastPoint.isEmpty)
{
return;
}
PathFigure figure = new PathFigure();
figure.StartPoint = lastPoint.Center();
PolyLineSegment lineSegment = new PolyLineSegment();
lineSegment.Points.Add(firstPoint.Center());
figure.Segments.Add(lineSegment);
this.shapeGeometry.Figures.Add(figure);
}
internal virtual double GetDistanceToPoint(DataPoint dataPoint, Point tapLocation, ChartPointDistanceCalculationMode pointDistanceMode)
{
var dataPointLocation = dataPoint.Center();
if (pointDistanceMode == ChartPointDistanceCalculationMode.TwoDimensional)
{
////TODO: Math.Sqrt could lead to potential performance issues with lost of points/series.
return(RadMath.GetPointDistance(dataPointLocation.X, tapLocation.X, dataPointLocation.Y, tapLocation.Y));
}
else
{
AxisPlotDirection plotDirection = this.Model.GetTypedValue <AxisPlotDirection>(AxisModel.PlotDirectionPropertyKey, AxisPlotDirection.Vertical);
if (plotDirection == AxisPlotDirection.Vertical)
{
return(Math.Abs(tapLocation.X - dataPointLocation.X));
}
else
{
return(Math.Abs(tapLocation.Y - dataPointLocation.Y));
}
}
}
