"rank" tag example

[alex263]

Could you give a hint on how rank tag shall be used - Id like to declare equivalent to dot expression
{ rank = same; "node1"; "node2"; }

[glejeune]

You need to create a subgraph to do this. I'll add anonymous subgraphs support and "blocks" in the next version.

[glejeune]

OK, you can now create anonymous subgraph. For more information, see http://github.com/glejeune/Ruby-Graphviz/blob/master/examples/sample35.rb

[alex263]

Originally I tried to play with twopi. Please, have a look -what may be wrong in this sample code I played with. Looks like "rank" has no any effect - all the "planets'" placement do not depend at all on rank

require "graphviz"

# The goal is to set each planet to its own orbit + set some (earth+moon) to the same orbit

g = GraphViz::new( "Solarsys",
  :type => "digraph",
  :use => "twopi"
)

# the star
sun  = g.add_node(
  'Sun',
  :shape => "circle",
  :penwidth => 2,
  :fontsize => 12,
  :style => :filled,
  :fillcolor => "orange",
  :label => "Sun\n"
)

planets = Hash.new

# The Earth and the Moon - in the same subgraph\rank
g.subgraph { |c|
  c[:rank => 'same']
  planets['Moon']  = g.add_node(
    'Moon',
    :shape => "circle",
    :penwidth => 2,
    :fontsize => 12,
    :style => :filled,
    :fillcolor => "red",
    :label => "Moon\n"
  )
  planets['Earth']  = g.add_node(
    'Earth',
    :shape => "circle",
    :penwidth => 2,
    :fontsize => 12,
    :style => :filled,
    :fillcolor => "blue",
    :label => "Earth\n"
  )
  g.add_edge( planets['Moon'], planets['Earth'],
    :penwidth => 2,
    :labeltooltip => "distance",
    :color => "black"
  )
  g.add_edge( sun, planets['Earth'],
    :penwidth => 2,
    :labeltooltip => "distance",
    :color => "black"
  )

}

# some more planets - each supposed having its own orbit - im trying to do it with rank
['Mercury','Venus','Mars','Jupiter','Saturn','Uranus','Neptune','Pluto'].each { |p|
 
  # set each to its own orbit
  # that doesnt seem to work ...
  g.subgraph { |c|
    c[:rank => "same"]
    planets[p] = g.add_node(
      p,
      :shape => "circle",
      :penwidth => 2,
      :fontsize => 12,
      :fillcolor => "green",
      :style => :filled,
      :label => "#{p}\n"
    )
    g.add_edge( sun, planets[p],
      :penwidth => 2,
      :label => "distance",
      :color => "black"
    )
  }

}

g.output( :svg => "sample36.svg" )
g.output( :dot => "sample36.dot" )

[glejeune]

I'm not sure what you espect... But maybe this is better :

require 'rubygems'
require "graphviz"

# The goal is to set each planet to its own orbit + set some (earth+moon) to the same orbit

g = GraphViz::new( "Solarsys",
 :type => "digraph",
 :use => "twopi"
)

# the star
sun  = g.add_node(
 'Sun',
 :shape => "circle",
 :penwidth => 2,
 :fontsize => 12,
 :style => :filled,
 :fillcolor => "orange",
 :label => "Sun\n"
)

planets = Hash.new
# The Earth and the Moon - in the same subgraph\rank
g.subgraph { |c|
 c[:rank => 'same']
 planets['Moon']  = c.add_node(
   'Moon',
   :shape => "circle",
   :penwidth => 2,
   :fontsize => 12,
   :style => :filled,
   :fillcolor => "red",
   :label => "Moon\n"
 )
 planets['Earth']  = c.add_node(
   'Earth',
   :shape => "circle",
   :penwidth => 2,
   :fontsize => 12,
   :style => :filled,
   :fillcolor => "blue",
   :label => "Earth\n"
 )
 c.add_edge( planets['Moon'], planets['Earth'],
   :penwidth => 2,
   :labeltooltip => "distance",
   :color => "black"
 )
 c.add_edge( sun, planets['Earth'],
   :penwidth => 2,
   :labeltooltip => "distance",
   :color => "black"
 )
}


# some more planets - each supposed having its own orbit - im trying to do it with rank
['Mercury','Venus','Mars','Jupiter','Saturn','Uranus','Neptune','Pluto'].each { |p|
 # set each to its own orbit
 # that doesnt seem to work ...
 g.subgraph { |c|
   c[:rank => "same"]
   planets[p] = c.add_node(
     p,
     :shape => "circle",
     :penwidth => 2,
     :fontsize => 12,
     :fillcolor => "green",
     :style => :filled,
     :label => "#{p}\n"
   )
   c.add_edge( sun, planets[p],
     :penwidth => 2,
     :label => "distance",
     :color => "black"
   )
 }
}
g.output( :svg => "sample36.svg" )
g.output( :dot => "sample36.dot" )

[xor256]

any sample without subgraph?