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#!/usr/bin/ruby
$:.unshift( "../lib" );
require "graphviz"
GraphViz::new( "ER", :type => "graph", :use => "neato" ) { |graph|
graph.node[:shape] = "box"
graph.course; graph.institute; graph.student
graph.node[:shape] = "ellipse"
graph.name0(:label => "name")
graph.name1(:label => "name")
graph.name2(:label => "name")
graph.code; graph.grade; graph.number
graph.node[:shape] = "diamond"
graph.node[:style] = "filled"
graph.node[:color] = "lightgrey"
graph.ci( :label => "C-I" )
graph.sc( :label => "S-C" )
graph.si( :label => "S-I" )
graph.name0 << graph.course;
graph.code << graph.course;
(graph.course << graph.ci).set { |e|
e.label = "n"
e.len = "1.00"
}
e = (graph.ci << graph.institute)
e.label = "1"
e[:len] = "1.00"
graph.institute << graph.name1;
e = (graph.institute << graph.si)
e[:label] = "1"
e[:len] = "1.00"
e = (graph.si << graph.student)
e[:label] = "n"
e[:len] = "1.00"
graph.student << graph.grade
graph.student << graph.name2
graph.student << graph.number
e = (graph.student << graph.sc)
e[:label] = "m"
e[:len] = "1.00"
e = (graph.sc << graph.course)
e[:label] = "n"
e[:len] = "1.00"
graph[:label] = "\\n\\nEntity Relation Diagram\\ndrawn by NEATO";
graph[:fontsize] = "20";
}.output( :path => '/usr/local/bin/', :png => "#{$0}.png" )
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