# Direction Link

- Object

Link directions to other objects.

### Hierarchy

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

### Object

Gamgi expects users to identify first the direction or list of directions and then the object to link. When the Direction entry is active and empty, clicking the mouse over an direction, on the current layer (local selection), its identification is transported to the Direction 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, 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.

### Link

Gamgi suppports only one type of linking mode for Cluster: Object.

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