HasseDiagrams

Drawings of partially ordered sets.

Basic Usage

julia> p = subset_lattice(3)
{8, 19} Int64 poset

julia> h = HasseDiagram(p)
Hasse diagram of a {8, 19} Int64 poset

julia> draw(h)

Creating a Layout

When a Hasse diagram is created, it is given a default layout. Hasse diagrams can be given an alternative layout with the function set_xy. There are two forms:

• set_xy(h, method) uses the function method to compute the layout. The function acts on the posets held inside h. The list of available layout methods is in the next section.
• set_xy(h, xy) uses the dictionary xy to site the vertices. Vertex v is placed at xy[v]. If v is not a key of xy, then its location is unchanged.

Layout Methods

• basic_layout places vertices vertically based on their rank and, within each rank, the horizontal placement is evenly spaced.
• layout_2d is a decent layout function but only applicable to posets whose dimension is at most two.

Properties

Font size

• Use set_font_size(h, sz) to set labels to be sz points. Use 0 to hide labels.
• Use get_font_size(h) to determine the current font size for h.