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Allow edge + vertex options to be passed to #write_to_graphic_file #41

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Merged
merged 4 commits into from
Feb 6, 2019
Merged

Allow edge + vertex options to be passed to #write_to_graphic_file #41

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4ca9721
Enable options to be passed to #write_to_graphic_file
lskalkos Jan 6, 2019
2081d8d
Add option to pass proc
lskalkos Jan 7, 2019
2e6a324
Add tests & fix vertex proc settings
lskalkos Jan 31, 2019
c88bf80
Update and correct test
lskalkos Feb 1, 2019
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32 changes: 20 additions & 12 deletions lib/rgl/dot.rb
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Original file line number Diff line number Diff line change
Expand Up @@ -33,21 +33,29 @@ def to_dot_graph(params = {})
fontsize = params['fontsize'] ? params['fontsize'] : '8'
graph = (directed? ? DOT::Digraph : DOT::Graph).new(params)
edge_class = directed? ? DOT::DirectedEdge : DOT::Edge
vertex_options = params['vertex'] || {}
edge_options = params['edge'] || {}

each_vertex do |v|
graph << DOT::Node.new(
'name' => vertex_id(v),
'fontsize' => fontsize,
'label' => vertex_label(v)
)
default_vertex_options = {
'name' => vertex_id(v),
'fontsize' => fontsize,
'label' => vertex_label(v)
}
each_vertex_options = default_vertex_options.merge(vertex_options)
vertex_options.each{|option, val| each_vertex_options[option] = val.call(v) if val.is_a?(Proc)}
graph << DOT::Node.new(each_vertex_options)
end

each_edge do |u, v|
graph << edge_class.new(
'from' => vertex_id(u),
'to' => vertex_id(v),
'fontsize' => fontsize
)
default_edge_options = {
'from' => vertex_id(u),
'to' => vertex_id(v),
'fontsize' => fontsize
}
each_edge_options = default_edge_options.merge(edge_options)
edge_options.each{|option, val| each_edge_options[option] = val.call(u, v) if val.is_a?(Proc)}
graph << edge_class.new(each_edge_options)
end

graph
Expand Down Expand Up @@ -75,12 +83,12 @@ def dotty(params = {})
# Use dot[http://www.graphviz.org] to create a graphical representation of
# the graph. Returns the filename of the graphics file.
#
def write_to_graphic_file(fmt='png', dotfile="graph")
def write_to_graphic_file(fmt='png', dotfile="graph", options={})
src = dotfile + ".dot"
dot = dotfile + "." + fmt

File.open(src, 'w') do |f|
f << self.to_dot_graph.to_s << "\n"
f << self.to_dot_graph(options).to_s << "\n"
end

unless system("dot -T#{fmt} #{src} -o #{dot}")
Expand Down
27 changes: 27 additions & 0 deletions test/dot_test.rb
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Original file line number Diff line number Diff line change
Expand Up @@ -29,6 +29,33 @@ def test_to_dot_digraph
end
end

def test_to_dot_digraph_with_options
graph = RGL::DirectedAdjacencyGraph["a", "b"]

begin
edge_labels = {}
graph.each_edge do |b, e|
key = "#{b}-#{e}"
edge_labels[key] = "#{b} to #{e}"
end

vertex_fontcolors = {'a' => 'green', 'b' => 'blue'}
vertex_fontcolor_setting = Proc.new{|v| vertex_fontcolors[v]}
vertex_settings = {'fontcolor' => vertex_fontcolor_setting, 'fontsize' => 12}

edge_label_setting = Proc.new{|b, e| edge_labels["#{b}-#{e}"]}
edge_settings = {'color' => 'red', 'label' => edge_label_setting}
dot_options = {'edge' => edge_settings,'vertex' => vertex_settings}
dot = graph.to_dot_graph(dot_options).to_s

assert_match(dot, /a \[\n\s*fontcolor = green,\n\s*fontsize = 12,\n\s*label = a\n\s*/)
assert_match(dot, /b \[\n\s*fontcolor = blue,\n\s*fontsize = 12,\n\s*label = b\n\s*/)
assert_match(dot, /a -> b \[\n\s*color = red,\n\s*fontsize = 8,\n\s*label = \"a to b\"\n/)
rescue
puts "Graphviz not installed?"
end
end

def test_to_dot_graph
graph = RGL::AdjacencyGraph["a", "b"]
def graph.vertex_label(v)
Expand Down