Create handle graphics group object with axes parent hax.
If no parent is specified, the group is created in the current axes.
Multiple property/value pairs may be specified for the hggroup, but they must appear in pairs.
The optional return value h is a graphics handle to the created hggroup object.
Programming Note: An hggroup is a way to group base graphics objects such
as line objects or patch objects into a single unit which can react
appropriately. For example, the individual lines of a contour plot are
collected into a single hggroup so that they can be made visible/invisible
with a single command, set (hg_handle, "visible", "off")
.
See also: addproperty, addlistener.
Package: octave