Histogram Charts

A histogram chart shows the frequency of data. The chart uses two types of data (data to be analyzed and the bin numbers that represent the frequency intervals of the data).

You can specify the following options for the chart:

Properties	Description
AutoUnderFlow AutoOverFlow	Specifies that the bin width is calculated using Scott’s normal reference rule. Scott’s normal reference rule tries to minimize the bias in variance of the histogram compared with the data set, while assuming normally distributed data.
BinCount	Specifies the number of bins for the histogram (including overflow and underflow bins).
OverFlowValue IsOverflowBin	Creates a bin for all values above the specified value.
IsUnderflowBin UnderFlowValue	Creates a bin for all values below or equal to the specified value.
BinType	Specifies whether to use categories or numbers for the bins.

You can add data to the control or use the HistogramSeries class to create data for the chart. Use the BinSize property to specify the bin size.

For information about creating charts in the Spread Designer or the Chart Designer, refer to Using the Spread Designer or Using the Chart Designer.

Using Code

Add data for the chart with the HistogramSeries class.
Set the bin size.
Specify the plot area.
Add the chart.

Example

This example creates a histogram chart with a bin size of 20.

C#	Copy Code
FarPoint.Web.Chart.HistogramSeries hs = new FarPoint.Web.Chart.HistogramSeries(); hs.SeriesName = "Histogram Sample"; hs.Values.Add(23); hs.Values.Add(5); hs.Values.Add(79); hs.Values.Add(11); hs.Values.Add(23); hs.Values.Add(55); hs.Values.Add(88); hs.Values.Add(67); hs.Values.Add(42); hs.Values.Add(56); hs.BinOption.BinSize = 20; FarPoint.Web.Chart.YPlotArea plotArea = new FarPoint.Web.Chart.YPlotArea(); plotArea.Series.Add(hs); FarPoint.Web.Chart.ChartModel model = new FarPoint.Web.Chart.ChartModel(); model.PlotAreas.Add(plotArea); FarPoint.Web.Spread.Chart.SpreadChart chart = new FarPoint.Web.Spread.Chart.SpreadChart(); chart.Model = model; FpSpread1.ActiveSheetView.Charts.Add(chart);

Copy Code

FarPoint.Web.Chart.HistogramSeries hs = new FarPoint.Web.Chart.HistogramSeries();
hs.SeriesName = "Histogram Sample";
hs.Values.Add(23);
hs.Values.Add(5);
hs.Values.Add(79);
hs.Values.Add(11);
hs.Values.Add(23);
hs.Values.Add(55);
hs.Values.Add(88);
hs.Values.Add(67);
hs.Values.Add(42);
hs.Values.Add(56);
hs.BinOption.BinSize = 20;

FarPoint.Web.Chart.YPlotArea plotArea = new FarPoint.Web.Chart.YPlotArea();
plotArea.Series.Add(hs);
FarPoint.Web.Chart.ChartModel model = new FarPoint.Web.Chart.ChartModel();
model.PlotAreas.Add(plotArea);
FarPoint.Web.Spread.Chart.SpreadChart chart = new FarPoint.Web.Spread.Chart.SpreadChart();
chart.Model = model;
FpSpread1.ActiveSheetView.Charts.Add(chart);

VB	Copy Code
Dim hs As New FarPoint.Web.Chart.HistogramSeries() hs.SeriesName = "Histogram Sample" hs.Values.Add(23) hs.Values.Add(5) hs.Values.Add(79) hs.Values.Add(11) hs.Values.Add(23) hs.Values.Add(55) hs.Values.Add(88) hs.Values.Add(67) hs.Values.Add(42) hs.Values.Add(56) hs.BinOption.BinSize = 20 Dim plotArea As New FarPoint.Web.Chart.YPlotArea() plotArea.Series.Add(hs) Dim model As New FarPoint.Web.Chart.ChartModel() model.PlotAreas.Add(plotArea) Dim chart As New FarPoint.Web.Spread.Chart.SpreadChart() chart.Model = model FpSpread1.ActiveSheetView.Charts.Add(chart)

Copy Code

Dim hs As New FarPoint.Web.Chart.HistogramSeries()
hs.SeriesName = "Histogram Sample"
hs.Values.Add(23)
hs.Values.Add(5)
hs.Values.Add(79)
hs.Values.Add(11)
hs.Values.Add(23)
hs.Values.Add(55)
hs.Values.Add(88)
hs.Values.Add(67)
hs.Values.Add(42)
hs.Values.Add(56)
hs.BinOption.BinSize = 20

Dim plotArea As New FarPoint.Web.Chart.YPlotArea()
plotArea.Series.Add(hs)
Dim model As New FarPoint.Web.Chart.ChartModel()
model.PlotAreas.Add(plotArea)
Dim chart As New FarPoint.Web.Spread.Chart.SpreadChart()
chart.Model = model
FpSpread1.ActiveSheetView.Charts.Add(chart)