Loon's standard linking model is based on three levels, the
linkingGroup and linkingKey states and the used
linkable states. See the details below.
l_setLinkedStates(widget, states)widget path as a string or as an object handle
used linkable state names, see in details below
Loon's standard linking model is based on two states,
linkingGroup and linkingKey. The full capabilities of the
standard linking model are described here. However, setting the
linkingGroup states for two or more displays to the same string is
generally all that is needed for linking displays that plot data from the
same data frame. Changing the linking group of a display is also the only
linking-related action available on the analysis inspectors.
The first linking level is as follows: loon's displays are linked if they
share the same string in their linkingGroup state. The default
linking group 'none' is a keyword and leaves a display un-linked.
The second linking level is as follows. All n-dimensional states can
be linked between displays. We call these states linkable. Further,
only linkable states with the same name can be linked between displays. One
consequence of this shared state name rule is that, with the
standard linking model, the linewidth state of a serialaxes display
cannot be linked with the size state of a scatterplot display. Also,
each display maintains a list that defines which of its linkable states
should be used for linking; we call these states the used linkable
states. The default used linkable states are as follows
| Display | Default used linkable states |
| scatterplot | selected, color, active,
size |
| histogram | selected, color,
active |
| serialaxes | selected, color, active |
| graph | selected, color, active, size |
If any two displays are set to be linked (i.e. they share the same linking group) then the intersection of their used linkable states are actually linked.
The third linking level is as follows. Every display has a
n-dimensional linkingKey state. Hence, every data point has
an associated linking key. Data points between linked plots are linked if
they share the same linking key.