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Radial Axes in Chart for WinForms C# Tutorial

Radial axes represent the collection of Radial that is able to plot categorical data and render numerical data in chart area in Windows Forms C# applications. The Chart is compatible with two Radial axes, Categorical Radial Axis, which is used to plot categorical data, and Numeric Radial Axis, which is used to render numerical data in chart area.

Categorical Radial Axis for Chart Area

Property of Categorical Radial Axis for Chart:

MainTickInterval, this is a property used to customize the step where the ticks are located. The value of the MainTickInterval shows the first axis ticks displayed

In addition, Categorical Radial Axes is the descendant of Axis class. Therefore, it will inherit all properties of the Axis class. When developers add Radar Point, Radar Line or Radar Area series to Chart, the Categorical Radial axis will be added automatically.

The below C# code sample shows that the Categorical Radial axis will be added when adding a Radar series property of the Polar Series instance.


RadarAreaSeries areaSeries = new RadarAreaSeries();
areaSeries.DataPoints.Add(new CategoricalDataPoint(6, "Apple"));
areaSeries.DataPoints.Add(new CategoricalDataPoint(4, "Orange"));
areaSeries.DataPoints.Add(new CategoricalDataPoint(9, "Banana"));

chart1.AreaType = ChartAreaType.Polar;
chart1.Series.Add(areaSeries);

Numeric Radial Axis for Chart Area

Key Properties of Numeric Radial Axis:

MainStep , this is the property used to customize the step within the adjacent ticks on the Radical axis.
DesiredTickCount , the property is used to set the user-defined number of ticks on the Radical axis.
RangeExtendDirection , the property is used to set the value to specify the automatic extended range of the axis. Its valid values include None, Positive, Negative, and Both.

None, the valid value of RangeExtendDirection, used to sets the minimum range to the minimum data point value and the maximum range to the maximum data point value.
Positive, the valid value of RangeExtendDirection, extends the range maximum with one major step if necessary.
Negative, the valid value of RangeExtendDirection, extends the range minimum with one major step if necessary.
Both, the valid value of RangeExtendDirection, extend the range in both negative and positive direction.

In addition, Numeric Radial Axis is the descendant of Axis class. Therefore, it will inherit all properties of the Axis class. When developers add Radar Point, Radar Line or Radar Area series to Chart, the Numeric Radial axis will be added automatically.

The below C# code sample shows that the Numeric Radial axis will be added when adding a Radar series property of the Polar Series instance.

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