AutomaticNumericScaleOptions.AutomaticMeasureUnitsCalculator Property
Gets or sets the automatic numeric measure unit calculator.
Namespace: DevExpress.Xpf.Charts
Assembly: DevExpress.Xpf.Charts.v24.1.dll
NuGet Package: DevExpress.Wpf.Charts
Declaration
[Browsable(false)]
public INumericMeasureUnitsCalculator AutomaticMeasureUnitsCalculator { get; set; }
Property Value
Type | Description |
---|---|
INumericMeasureUnitsCalculator | An object of the class implementing the INumericMeasureUnitsCalculator interface. |
Example
The automatic numeric scale options provide the capability to use a custom measurement unit calculator to determine the current measurement unit if the predefined one does not fit your requirements. Design a class that implements the INumericMeasureUnitsCalculator interface and assign it to the AutomaticNumericScaleOptions.AutomaticMeasureUnitsCalculator
property to use a custom measurement units calculation algorithm:
public class CustomAutomaticNumericMeasureUnitsCalculator : INumericMeasureUnitsCalculator {
public double CalculateMeasureUnit(
IEnumerable<Series> series,
double axisLength, int pixelsPerUnit,
double visualMin, double visualMax,
double wholeMin, double wholeMax
) {
double rawMeasureUnit = (visualMax - visualMin) * pixelsPerUnit / axisLength;
return Math.Pow(10, GetDigitCount((int)Math.Abs(rawMeasureUnit)));
}
private static readonly int[] valueStops = {
9, 99, 999, 9999, 99999, 999999, 9999999,
99999999, 999999999, Int32.MaxValue
};
private static int GetDigitCount(int value) {
for (int i = 0; ; i++)
if (value <= valueStops[i])
return i + 1;
}
}
See Also