TickCallback (Charba - J2CL and GWT charts library based on CHART.JS)

All Known Implementing Classes:

NoSelectedDatasetTicksCallback
```
public interface TickCallback
```
Interface to implement if wants to change the tick marks to include information about the data type, for axes which are showing data as numbers.
It can return a List of strings (for multiple lines).

Author:

Andrea "Stock" Stocchero

See Also:

CartesianLinearAxis, CartesianLogarithmicAxis, RadialAxis

Method Summary

All Methods Instance Methods Abstract Methods
Modifier and Type	Method	Description
`Object`	`onCallback(Axis axis, double value, int index, List<Double> values)`	Changes the tick marks to include information about the data type.

- Method Detail
  - onCallback
```
Object onCallback(Axis axis,
                  double value,
                  int index,
                  List<Double> values)
```
    Changes the tick marks to include information about the data type.
    
    Parameters:
    
    axis - axis instance where this callback as been defined
    
    value - value of tick
    
    index - index of tick
    
    values - list of all tick values
    
    Returns:
    
    the tick to apply or if the callback returns null the associated grid line will be hidden.
    It can return a List of strings (for multiple lines) or a string (for single line).