Add objects to the layer or move the layer to another window.
Hierarchy
Layers can be linked to objects above or below, in the Gamgi
hierarchy. Pressing the button
Below (the default), the
Objects menu shows the classes of objects that can be owned
by layers: Assembliy, Light, Cell, Cluster, Molecule, Group, Plane,
Direction, Atom (the default), Orbital and Text. Pressing the button
Above, the same menu shows the only class of objects that
can own layers: Window.
Object
Gamgi expects users to identify first the layer or list of layers
and then the object to link. When the
Layer entry is active
and empty, pressing the mouse over the graphic area in the current
window (local selection) creates a menu with all the layers in the
window, which can then be selected. Initially, the identification
of the current layer is entered in the
Layer entry.
Gamgi is now expecting users to click on a object of the class
currently selected in the
Object menu. This object can be
in a different layer or even in a different window (global selection).
To select a visible object in a different layer, in the same window,
just press the mouse over the object, as if it was in the current
layer. To select objects without visual representation, as windows
and lights, press the mouse over the graphic area in a window,
to create a menu with all the objects of that class in the window
(when the class is Light) or in Gamgi (when the class is Window),
which can then be selected. To select an object in a different
window, with the mouse, use exactly the same procedure, in that window.
Method
Gamgi suppports only one type of linking mode for Layer:
Object.
The
Object method links a layer to a single
Object.
When the
Hierarchy is
Above, the layer is unlinked
from its previous window and linked to the new window. The layer
history kept by the
Undo and
Save mechanisms is
preserved in this operation. When the
Hierarchy is
Below,
the object is unlinked from its current parent and linked to the layer.
An error is issued when the parent already owned the child object.
After the linking operation, Gamgi always puts on top
the window and layer containing the linked objects.