The IlvManager data structure is a container for graphic objects, therefore, it is the most important object of the Framework. The manager organizes graphic objects into several layers; graphic objects contained in a higher level layer are displayed in front of objects located in a lower layer.
The manager also provides the means to select the graphic objects. The library comes with several predefined ways to display a selected graphic object; you can subclass IlvManager to create your own user-defined display methods.
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