/// <summary>
/// Collect statistical information about the series.
/// </summary>
/// <param name="segmentCount">Segment count.</param>
/// <param name="minYValue">Minimum Y value.</param>
/// <param name="maxYValue">Maximum Y value.</param>
/// <param name="segmentSize">Segment size.</param>
/// <param name="segmentMaxValue">Array of segment scale maximum values.</param>
/// <param name="segmentMinValue">Array of segment scale minimum values.</param>
/// <returns></returns>
internal int[] GetSeriesDataStatistics(
int segmentCount,
out double minYValue,
out double maxYValue,
out double segmentSize,
out double[] segmentMaxValue,
out double[] segmentMinValue)
{
// Get all series associated with the axis
ArrayList axisSeries = AxisScaleBreakStyle.GetAxisSeries(axis);
// Get range of Y values from axis series
axis.Common.DataManager.GetMinMaxYValue(axisSeries, out minYValue, out maxYValue);
int numberOfPoints = 0;
foreach (Series series in axisSeries)
{
numberOfPoints = Math.Max(numberOfPoints, series.Points.Count);
}
if (axisSeries.Count == 0 || numberOfPoints == 0)
{
segmentSize = 0.0;
segmentMaxValue = null;
segmentMinValue = null;
return(Array.Empty <int>());
}
// Split range of values into predefined number of segments and calculate
// how many points will be in each segment.
segmentSize = (maxYValue - minYValue) / segmentCount;
int[] segmentPointNumber = new int[segmentCount];
segmentMaxValue = new double[segmentCount];
segmentMinValue = new double[segmentCount];
for (int index = 0; index < segmentCount; index++)
{
segmentMaxValue[index] = double.NaN;
segmentMinValue[index] = double.NaN;
}
foreach (Series series in axisSeries)
{
// Get number of Y values to process
int maxYValueCount = 1;
IChartType chartType = axis.ChartArea.Common.ChartTypeRegistry.GetChartType(series.ChartTypeName);
if (chartType != null && chartType.ExtraYValuesConnectedToYAxis && chartType.YValuesPerPoint > 1)
{
maxYValueCount = chartType.YValuesPerPoint;
}
// Iterate throug all data points
foreach (DataPoint dataPoint in series.Points)
{
if (!dataPoint.IsEmpty)
{
// Iterate through all yValues
for (int yValueIndex = 0; yValueIndex < maxYValueCount; yValueIndex++)
{
// Calculate index of the scale segment
int segmentIndex = (int)Math.Floor((dataPoint.YValues[yValueIndex] - minYValue) / segmentSize);
if (segmentIndex < 0)
{
segmentIndex = 0;
}
if (segmentIndex > segmentCount - 1)
{
segmentIndex = segmentCount - 1;
}
// Increase number points in that segment
++segmentPointNumber[segmentIndex];
// Store Min/Max values for the segment
if (segmentPointNumber[segmentIndex] == 1)
{
segmentMaxValue[segmentIndex] = dataPoint.YValues[yValueIndex];
segmentMinValue[segmentIndex] = dataPoint.YValues[yValueIndex];
}
else
{
segmentMaxValue[segmentIndex] = Math.Max(segmentMaxValue[segmentIndex], dataPoint.YValues[yValueIndex]);
segmentMinValue[segmentIndex] = Math.Min(segmentMinValue[segmentIndex], dataPoint.YValues[yValueIndex]);
}
}
}
}
}
return(segmentPointNumber);
}
/// <summary>
/// Checks if scale breaks can be used on specified axis.
/// </summary>
/// <returns>True if scale breaks can be used on this axis</returns>
internal bool CanUseAxisScaleBreaks()
{
// Check input parameters
if (axis == null || axis.ChartArea == null || axis.ChartArea.Common.Chart == null)
{
return(false);
}
// No scale breaks in 3D charts
if (axis.ChartArea.Area3DStyle.Enable3D)
{
return(false);
}
// Axis scale break can only be applied to the Y and Y 2 axis
if (axis.axisType == AxisName.X || axis.axisType == AxisName.X2)
{
return(false);
}
// No scale breaks for logarithmic axis
if (axis.IsLogarithmic)
{
return(false);
}
// No scale breaks if axis zooming is enabled
if (axis.ScaleView.IsZoomed)
{
return(false);
}
// Check series associated with this axis
ArrayList axisSeries = AxisScaleBreakStyle.GetAxisSeries(axis);
foreach (Series series in axisSeries)
{
// Some special chart type are not supported
if (series.ChartType == SeriesChartType.Renko ||
series.ChartType == SeriesChartType.PointAndFigure)
{
return(false);
}
// Get chart type interface
IChartType chartType = axis.ChartArea.Common.ChartTypeRegistry.GetChartType(series.ChartTypeName);
if (chartType == null)
{
return(false);
}
// Circular and stacked chart types can not use scale breaks
if (chartType.CircularChartArea ||
chartType.Stacked ||
!chartType.RequireAxes)
{
return(false);
}
}
return(true);
}
