# Atom Link

- Object

Link atoms to other objects.

### Hierarchy

Atoms 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 atoms: Orbital and Text (the default). Pressing the button Above, the same menu shows the classes of objects that can own atoms: Layer (the default), Assembly, Cell, Cluster, Molecule, Group, Plane and Direction.

### Object

Gamgi expects users to identify first the atom or list of atoms and then the object to link. When the Atom entry is active and empty, clicking the mouse over an atom, on the current layer (local selection), its identification is transported to the Atom 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 layers and lights, press the mouse over the graphic area in the window, to create a menu with all the objects of that class in the 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 Cluster: Object.

The Object method links an atom to a single Object. When the Hierarchy is Above, the atom is unlinked from its current parent and linked to the object. When the atom is moved to a different layer, all its bonds are autmatically removed. When the Hierarchy is Below, the object is unlinked from its current parent and linked to the atom. 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.
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