/
graphviz_graphs.jl
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/
graphviz_graphs.jl
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# # Drawing graphs in Graphviz
#
#md # [](@__NBVIEWER_ROOT_URL__/generated/graphics/graphviz_graphs.ipynb)
#
# All of the basic graph types provided by the Catlab `Graphs` module can be
# drawn using [Graphviz](https://www.graphviz.org/). By default, "directed"
# graph types (`Graph`, `ReflexiveGraph`) are drawn using the `dot` program and
# "undirected" graph types (`SymmetricGraph`, `HalfEdgeGraph`) are drawn using
# the `neato` program.
using Catlab.Graphs, Catlab.Graphics
# ## Drawing basic graphs
g = cycle_graph(Graph, 3)
to_graphviz(g)
#-
sg = cycle_graph(SymmetricGraph, 3)
to_graphviz(sg)
# Node and edge IDs can be shown by setting `node_labels=true` and
# `edge_labels=true`, or a data attribute can be used as a label by setting
# `node_labels=:my_vertex_attr` and `edge_lables=:my_edge_attr`.
to_graphviz(g, node_labels=true, edge_labels=true)
# Graph-level, node-level, and edge-level [Graphviz
# attributes](https://graphviz.org/doc/info/attrs.html) can be supplied using
# the `graph_attrs`, `node_attrs`, and `edge_attrs` keyword arguments.
to_graphviz(g, node_attrs=Dict(:color => "cornflowerblue"),
edge_attrs=Dict(:style => "dotted"))
# ## Drawing graph homomorphisms
#
# Graph homomorphsims (`ACSetTransformation`s between graphs) can also be drawn
# using Graphviz, in several different styles.
using Catlab.CategoricalAlgebra
f = homomorphism(cycle_graph(Graph, 4), complete_graph(Graph, 2))
# By default, the domain and codomain graph are both drawn, as well the vertex
# mapping between them.
to_graphviz(f)
# To see the edge mapping, which is not necessarily unique in the presence of
# the multiple edges, colors can be used.
to_graphviz(f, edge_colors=true)
# Alternatively, the graph homomorphism can be depicted by drawing only the
# domain graph and coloring its nodes and edges. By default, setting
# `draw_codom=false` sets both `node_colors=true` and `edge_colors=true`.
to_graphviz(f, draw_codom=false)
#-
to_graphviz(f, draw_codom=false, edge_colors=false)
# ## Drawing maps between finite sets
#
# It is also possible to visualize maps between finite sets (`FinFunction`s
# between `FinSet`s) using Graphviz.
using Catlab.CategoricalAlgebra.FinSets
A = FinSet(4)
B = FinSet(3)
f = FinFunction([1,3,2,2], A, B)
to_graphviz(f, graph_attrs=Dict(:splines=>"false"))
#-
to_graphviz(f, node_labels=true,
graph_attrs=Dict(:splines=>"false", :rankdir => "TB"))