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

```
public interface InitCallback
```
Callback interface of AnnotationPlugin.ID plugin to set init property at runtime.
The returned value could be a boolean or an AnnotationProperties.

Author:

Andrea "Stock" Stocchero

Method Summary

All Methods Instance Methods Abstract Methods
Modifier and Type	Method	Description
`Object`	`invoke(IsChart chart, AnnotationProperties properties, AbstractAnnotation options)`	Invoked to enable a custom logic to apply the animation initialization.

- Method Detail
  - invoke
```
Object invoke(IsChart chart,
              AnnotationProperties properties,
              AbstractAnnotation options)
```
    Invoked to enable a custom logic to apply the animation initialization.
    
    Parameters:
    
    chart - chart instance
    
    properties - initializing annotation element properties
    
    options - annotation options
    
    Returns:
    
    could be a boolean or an AnnotationProperties