default Mark Decorator
The default mark decorator for this Mark, if you use a custom DatumDecorator you may want to call defaultMarkDecorator(datum, x, y, drawingZone) to draw the expected sign.
The default mark decorator for this Mark, if you use a custom DatumDecorator you may want to call defaultMarkDecorator(datum, x, y, drawingZone) to draw the expected sign.