[ Version ( since = "3.6" ) ]
public void add_offset_value (string name, double value)
Adds a new offset marker on this at the position specified by value.
When the bar value is in the interval topped by value (or between value and
max_value in case the offset is the last one on the bar) a style class named
`level-`name will be applied when rendering the level bar fill. If another offset marker named name exists, its
value will be replaced by value.
| this |
a LevelBar |
| name |
the name of the new offset |
| value |
the value for the new offset |