private static DataPoint FindNextNonEmptyPoint(IList <DataPoint> dataPoints, DataPointSegment dataSegment, bool isClosedShape)
{
// NOTE: We cannot simply get the first point from the next segment as "segment" is defined at least for two points
// and it is possible that there are single non-empty points in-between segments.
if (dataSegment.EndIndex < dataPoints.Count - 1)
{
for (int i = dataSegment.EndIndex + 1; i < dataPoints.Count; i++)
{
var point = dataPoints[i];
if (!point.isEmpty && !double.IsNaN(point.CenterX()) && !double.IsNaN(point.CenterY()))
{
return(point);
}
}
}
if (isClosedShape)
{
for (int i = 0; i < dataPoints.Count; i++)
{
var point = dataPoints[i];
if (!point.isEmpty && !double.IsNaN(point.CenterX()) && !double.IsNaN(point.CenterY()))
{
return(point);
}
}
}
return(dataPoints[dataSegment.EndIndex]);
}
protected override IEnumerable <Point> GetPoints(DataPointSegment segment)
{
AxisPlotDirection plotDirection = this.model.GetTypedValue <AxisPlotDirection>(AxisModel.PlotDirectionPropertyKey, AxisPlotDirection.Vertical);
ReferenceDictionary <string, Delegate> valueExtractor = plotDirection == AxisPlotDirection.Vertical ? VerticalPlotValueExtractors : HorizontalPlotValueExtractors;
foreach (Point point in StepSeriesHelper.GetPoints(segment, this.model as StepSeriesModel, this.renderPoints, valueExtractor))
{
yield return(point);
}
}
protected override IEnumerable <Point> GetTopPoints(DataPointSegment segment)
{
int pointIndex = segment.StartIndex;
while (pointIndex <= segment.EndIndex)
{
yield return(this.renderPoints[pointIndex].Center());
pointIndex++;
}
}
protected override IEnumerable <Point> GetPoints(DataPointSegment segment)
{
// return the first point since spline segmentation skips it
yield return(this.renderPoints[segment.StartIndex].Center());
IChartView view = this.model.GetChartArea().view;
double scaleFactor = Math.Abs(view.ZoomWidth - view.ZoomHeight) / 2;
foreach (Point point in SplineHelper.GetSplinePoints(this.renderPoints, segment, scaleFactor))
{
yield return(point);
}
}
protected override IEnumerable <Windows.Foundation.Point> GetTopPoints(DataPointSegment segment)
{
AxisPlotDirection plotDirection = this.model.GetTypedValue <AxisPlotDirection>(AxisModel.PlotDirectionPropertyKey, AxisPlotDirection.Vertical);
ReferenceDictionary <string, Delegate> valueExtractor = plotDirection == AxisPlotDirection.Vertical ? VerticalRangePlotValueExtractors : HorizontalRangePlotValueExtractors;
Func <DataPoint, Point> topPointGetter = (Func <DataPoint, Point>)valueExtractor[TopPointGetter];
int pointIndex = segment.StartIndex;
while (pointIndex <= segment.EndIndex)
{
var currentPoint = this.renderPoints[pointIndex];
yield return(topPointGetter(currentPoint));
pointIndex++;
}
}
protected static IEnumerable <DataPointSegment> GetDataSegments(IList <DataPoint> dataPoints)
{
DataPointSegment dataSegment = null;
int pointIndex = 0;
foreach (DataPoint point in dataPoints)
{
if (point.isEmpty || double.IsNaN(point.CenterX()) || double.IsNaN(point.CenterY()))
{
if (dataSegment != null)
{
dataSegment.EndIndex = pointIndex - 1;
// segment is defined for at least two points
if (dataSegment.StartIndex != dataSegment.EndIndex)
{
yield return(dataSegment);
}
dataSegment = null;
}
}
else
{
if (dataSegment == null)
{
dataSegment = new DataPointSegment();
dataSegment.StartIndex = pointIndex;
}
}
pointIndex++;
}
if (dataSegment != null)
{
dataSegment.EndIndex = dataPoints.Count - 1;
// segment is defined for at least two points
if (dataSegment.StartIndex != dataSegment.EndIndex)
{
yield return(dataSegment);
}
}
}
internal static IEnumerable <Point> GetPoints(DataPointSegment segment, StepSeriesModel seriesModel, IList <DataPoint> renderPoints, ReferenceDictionary <string, Delegate> valueExtractor)
{
AxisPlotDirection plotDirection = seriesModel.GetTypedValue <AxisPlotDirection>(AxisModel.PlotDirectionPropertyKey, AxisPlotDirection.Vertical);
AxisModel axisModel = plotDirection == AxisPlotDirection.Vertical ? seriesModel.firstAxis : seriesModel.secondAxis;
var risersActualPosition = StepSeriesHelper.GetActualRisersPosition(seriesModel.RisersPosition, axisModel.ActualPlotMode);
var isRisersPositionEqualToPlotMode = StepSeriesHelper.IsRisersPositionEqualToPlotMode(axisModel.ActualPlotMode, risersActualPosition);
var view = seriesModel.GetChartArea().view;
Size chartScale = new Size(view.ZoomWidth, view.ZoomHeight);
double slotLength = StepSeriesHelper.GetSlotLength(seriesModel, plotDirection, chartScale);
double halfSlotLength = slotLength / 2;
Func <Point, Point, Point> riserPointGetter = (Func <Point, Point, Point>)valueExtractor[RiserPointGetter];
Func <Point, Point, double, Point> firstRiserPointGetter = (Func <Point, Point, double, Point>)valueExtractor[FirstRiserPointGetter];
Func <Point, Point, double, Point> secondRiserPointGetter = (Func <Point, Point, double, Point>)valueExtractor[SecondRiserPointGetter];
int pointIndex = segment.StartIndex;
while (pointIndex <= segment.EndIndex)
{
var currentPoint = renderPoints[pointIndex].Center();
yield return(currentPoint);
if (pointIndex == segment.EndIndex)
{
yield break;
}
var nextPoint = renderPoints[pointIndex + 1].Center();
if (isRisersPositionEqualToPlotMode || axisModel is DateTimeContinuousAxisModel)
{
yield return(riserPointGetter(currentPoint, nextPoint));
}
else
{
yield return(firstRiserPointGetter(currentPoint, nextPoint, halfSlotLength));
yield return(secondRiserPointGetter(currentPoint, nextPoint, halfSlotLength));
}
pointIndex++;
}
}
protected override IList <Point> GetBottomPoints(AreaRenderContext context)
{
AxisPlotDirection plotDirection = this.model.GetTypedValue <AxisPlotDirection>(AxisModel.PlotDirectionPropertyKey, AxisPlotDirection.Vertical);
ReferenceDictionary <string, Delegate> valueExtractor = plotDirection == AxisPlotDirection.Vertical ? VerticalRangePlotValueExtractors : HorizontalRangePlotValueExtractors;
Func <DataPoint, Point> bottomPointGetter = (Func <DataPoint, Point>)valueExtractor[BottomPointGetter];
DataPointSegment currentSegment = context.CurrentSegment;
List <Point> points = new List <Point>();
int pointIndex = currentSegment.StartIndex;
while (pointIndex <= currentSegment.EndIndex)
{
var currentPoint = this.renderPoints[pointIndex];
points.Add(bottomPointGetter(currentPoint));
pointIndex++;
}
return(points);
}
public static IEnumerable <Point> GetSplinePoints(IList <DataPoint> dataPoints, DataPointSegment dataSegment, double scaleFactor, bool isClosedShape = false)
{
double tolerance = DefaultTolerance;
if (scaleFactor > 2)
{
tolerance *= (int)scaleFactor / 2;
}
Point startPoint = FindPreviousNonEmptyPoint(dataPoints, dataSegment, isClosedShape).Center();
Point endPoint = FindNextNonEmptyPoint(dataPoints, dataSegment, isClosedShape).Center();
// NOTE: data segment is defined for at least two points so we do not need the check conditions for zero or one count.
int segmentPointCount = dataSegment.EndIndex - dataSegment.StartIndex + 1;
if (segmentPointCount == 2)
{
Point firstPoint = dataPoints[dataSegment.StartIndex].Center();
Point secondPoint = dataPoints[dataSegment.EndIndex].Center();
foreach (Point segmentedPoint in Segment(startPoint, firstPoint, secondPoint, endPoint, tolerance))
{
yield return(segmentedPoint);
}
yield break;
}
IEnumerable <Point> segmentedPoints;
for (int i = dataSegment.StartIndex; i < dataSegment.EndIndex; i++)
{
if (i == dataSegment.StartIndex)
{
segmentedPoints = Segment(
startPoint,
dataPoints[i].Center(),
dataPoints[i + 1].Center(),
dataPoints[i + 2].Center(),
tolerance);
}
else if (i == dataSegment.EndIndex - 1)
{
segmentedPoints = Segment(
dataPoints[i - 1].Center(),
dataPoints[i].Center(),
dataPoints[i + 1].Center(),
endPoint,
tolerance);
}
else
{
segmentedPoints = Segment(
dataPoints[i - 1].Center(),
dataPoints[i].Center(),
dataPoints[i + 1].Center(),
dataPoints[i + 2].Center(),
tolerance);
}
foreach (Point point in segmentedPoints)
{
yield return(point);
}
}
}
protected abstract IEnumerable <Point> GetTopPoints(DataPointSegment segment);
protected override IList <Windows.Foundation.Point> GetBottomPoints(AreaRenderContext context)
{
List <Point> points = new List <Point>();
DataPointSegment currentSegment = context.CurrentSegment;
ReferenceDictionary <string, Delegate> valueExtractor;
if (context.PlotDirection == AxisPlotDirection.Vertical)
{
valueExtractor = AreaRendererBase.VerticalPlotValueExtractors;
}
else
{
valueExtractor = AreaRendererBase.HorizontalPlotValueExtractors;
}
if (!context.IsStacked)
{
Func <DataPoint, double, Point> pointGetter = (Func <DataPoint, double, Point>)valueExtractor[PointGetter];
points.Add(pointGetter(this.renderPoints[currentSegment.StartIndex], context.PlotLine));
points.Add(pointGetter(this.renderPoints[currentSegment.EndIndex], context.PlotLine));
}
else
{
Func <Point, int> pointBoundsGetter = (Func <Point, int>)valueExtractor[PointBoundsGetter];
Func <DataPoint, bool, int> dataPointBoundsGetter = (Func <DataPoint, bool, int>)valueExtractor[DataPointBoundsGetter];
Func <int, int, bool, bool> shouldSkipPreviousPoints = (Func <int, int, bool, bool>)valueExtractor[ShouldSkipPreviousPoints];
Func <int, int, bool, bool> segmentEndNotReached = (Func <int, int, bool, bool>)valueExtractor[SegmentEndNotReached];
Func <Point, Point, bool> shouldRemoveDuplicate = (Func <Point, Point, bool>)valueExtractor[ShouldRemoveDuplicate];
int segmentStart = dataPointBoundsGetter(this.renderPoints[currentSegment.StartIndex], context.IsPlotInverse);
int segmentEnd = dataPointBoundsGetter(this.renderPoints[currentSegment.EndIndex], context.IsPlotInverse);
IList <Point> stackedPoints = context.PreviousStackedPoints;
Point currentPoint;
int currentPointBounds;
do
{
currentPoint = stackedPoints[context.PreviousStackedPointsCurrentIndex];
currentPointBounds = pointBoundsGetter(currentPoint);
context.PreviousStackedPointsCurrentIndex++;
if (shouldSkipPreviousPoints(currentPointBounds, segmentStart, context.IsPlotInverse))
{
continue;
}
points.Add(currentPoint);
}while (segmentEndNotReached(currentPointBounds, segmentEnd, context.IsPlotInverse) && context.PreviousStackedPointsCurrentIndex < stackedPoints.Count);
context.PreviousStackedPointsCurrentIndex--;
if (shouldRemoveDuplicate(points[0], points[1]))
{
points.RemoveAt(0);
}
}
return(points);
}