To organize graphic objects in a manager you place them
in multiple storage areas called layers.
Each graphic object stored in a layer is unique to that
layer and can be stored only in that layer.
Instances of the
IlvManager class handle a set of graphic objects derived from
the Rogue Wave® JViews class called
IlvGraphic.. The different graphic objects stored throughout
the manager all share the same coordinate system. For this reason,
a manager is a tool designed to handle objects placed on different
priority levels. “Priority level” here means that objects
stored in a higher screen layer are displayed in front of objects
in lower layers.