/// <summary>
/// Find the nearest DataPoint from each dataSeries from a xValue and yValue
/// </summary>
/// <param name="dataSeries"></param>
/// <param name="internalXValue">internalXValue</param>
/// <param name="internalYValue">internalYValue</param>
/// <returns></returns>
internal static DataPoint GetNearestDataPoint(DataSeries dataSeries, Double xValueAtMousePos, Double yValueAtMousePos)
{
DataPoint nearestDataPoint = null;
// Get all DataPoints order by the XValue distance from the internalXValue.
List <DataPoint> dataPointsAlongX = (from dp in dataSeries.InternalDataPoints
where
!(RenderHelper.IsFinancialCType(dp.Parent) && dp.InternalYValues == null) ||
!(!RenderHelper.IsFinancialCType(dp.Parent) && Double.IsNaN(dp.YValue))
orderby Math.Abs(dp.InternalXValue - xValueAtMousePos)
select dp).ToList();
if (dataPointsAlongX.Count > 0)
{
// Get the internalXValue of the first DataPoint of the ordered list
Double xValue = dataPointsAlongX[0].InternalXValue;
// DataPoints along y pixel direction which have same XValue
List <DataPoint> dataPointsAlongYAxisHavingSameXValue = new List <DataPoint>();
foreach (DataPoint dp in dataPointsAlongX)
{
if (dp.InternalXValue == xValue)
{
dataPointsAlongYAxisHavingSameXValue.Add(dp);
}
}
if (!Double.IsNaN(yValueAtMousePos))
{
// Sort according to YValue or YValues
if (RenderHelper.IsFinancialCType(dataSeries))
{
dataPointsAlongYAxisHavingSameXValue = (from dp in dataPointsAlongYAxisHavingSameXValue
where (dp.InternalYValues != null)
orderby Math.Abs(dp.InternalYValues.Max() - yValueAtMousePos)
select dp).ToList();
}
else
{
dataPointsAlongYAxisHavingSameXValue = (from dp in dataPointsAlongYAxisHavingSameXValue
where !Double.IsNaN(dp.InternalYValue)
orderby Math.Abs(dp.InternalYValue - yValueAtMousePos)
select dp).ToList();
}
}
if (dataPointsAlongYAxisHavingSameXValue.Count > 0)
{
nearestDataPoint = dataPointsAlongYAxisHavingSameXValue.First();
}
}
return(nearestDataPoint);
}
/// <summary>
/// Get nearest DataPoint along XAxis
/// </summary>
/// <param name="dataPoints"></param>
/// <param name="internalXValue"></param>
/// <returns></returns>
internal static DataPoint GetNearestDataPointAlongXAxis(List <DataPoint> dataPoints, Axis xAxis, Double internalXValue)
{
List <DataPoint> dataPointsAlongX = (from dp in dataPoints
where
!(RenderHelper.IsFinancialCType(dp.Parent) && dp.InternalYValues == null) ||
!(!RenderHelper.IsFinancialCType(dp.Parent) && Double.IsNaN(dp.YValue))
orderby Math.Abs(dp.InternalXValue - internalXValue)
select dp).ToList();
if (dataPointsAlongX.Count > 0)
{
return(dataPointsAlongX.First());
}
else
{
return(null);
}
}