Layouts
In each layout, each data item appears once.
A layout is a mapping from ids to positions (x, y, width, height).
Layouts may be based on the topology of a network (topology-based layouts) or just on the attributes of each element (attribute based layouts).
After it has been computed, a layout can be modified by applying one or more layout transformations.
Attribute-based layouts
Attribute-based layouts are constructed by combining one or more ordering(s) or scale(s).
Single Scale or Axes
A single ordering or scale can be mapped to a line or circle, or wrapped into a grid or spiral pattern.