Class: Zadt::Graph
- Inherits:
-
Object
- Object
- Zadt::Graph
- Defined in:
- lib/zadt/AbstractDataTypes/Graph/graph.rb,
lib/zadt/HelpModules/Functionality/Graph/graph.rb
Instance Attribute Summary collapse
-
#edges ⇒ Object
readonly
Which are connected by.
-
#value ⇒ Object
Contains.
-
#vertices ⇒ Object
readonly
Made up of.
Class Method Summary collapse
Instance Method Summary collapse
-
#add_vertex ⇒ Object
Add a vertex.
- #break_connection(v1, v2) ⇒ Object
-
#find_connection(v1, v2) ⇒ Object
Find the edge connecting two vertices.
- #help ⇒ Object
-
#initialize ⇒ Graph
constructor
init_v allows for initial vertices (not generally used).
-
#is_connected?(v1, v2) ⇒ Boolean
Returns whether two vertices are connected.
-
#make_connection(v1, v2) ⇒ Object
Make an edge between two vertices.
-
#remove_vertex(vertex) ⇒ Object
Remove a vertex.
Constructor Details
#initialize ⇒ Graph
init_v allows for initial vertices (not generally used)
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# File 'lib/zadt/AbstractDataTypes/Graph/graph.rb', line 15 def initialize #@vertices is ALL vertices on the graph @vertices = [] #@edges is ALL edges on the graph @edges = [] @value = Hash.new end |
Instance Attribute Details
#edges ⇒ Object (readonly)
Which are connected by
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# File 'lib/zadt/AbstractDataTypes/Graph/graph.rb', line 9 def edges @edges end |
#value ⇒ Object
Contains
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# File 'lib/zadt/AbstractDataTypes/Graph/graph.rb', line 12 def value @value end |
#vertices ⇒ Object (readonly)
Made up of
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# File 'lib/zadt/AbstractDataTypes/Graph/graph.rb', line 6 def vertices @vertices end |
Class Method Details
.help ⇒ Object
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# File 'lib/zadt/HelpModules/Functionality/Graph/graph.rb', line 7 def self.help Graph. end |
Instance Method Details
#add_vertex ⇒ Object
Add a vertex
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# File 'lib/zadt/AbstractDataTypes/Graph/graph.rb', line 24 def add_vertex vertex = Vertex.new @vertices << vertex vertex end |
#break_connection(v1, v2) ⇒ Object
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# File 'lib/zadt/AbstractDataTypes/Graph/graph.rb', line 75 def break_connection(v1, v2) raise "First vertex does not exist" if !v1 raise "Second vertex does not exist" if !v2 if is_connected?(v1, v2) # Find edge edge = find_connection(v1, v2) # Remove edge from edges catalog @edges.delete(edge) #Remove edge from vertices v1.edges.delete(edge) v2.edges.delete(edge) v1.connections.delete(v2) v2.connections.delete(v1) else raise "Vertices are not connected" end end |
#find_connection(v1, v2) ⇒ Object
Find the edge connecting two vertices
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# File 'lib/zadt/AbstractDataTypes/Graph/graph.rb', line 61 def find_connection(v1, v2) raise "not a vertex" unless v1.is_a?(Vertex) && v2.is_a?(Vertex) raise "Vertices not connected" if !is_connected?(v1, v2) connection = v1.edges.select {|edge| edge.connection.include?(v2)} raise "Error finding connection" if connection.length > 1 connection.first end |
#help ⇒ Object
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# File 'lib/zadt/HelpModules/Functionality/Graph/graph.rb', line 3 def help Graph.help end |
#is_connected?(v1, v2) ⇒ Boolean
Returns whether two vertices are connected
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# File 'lib/zadt/AbstractDataTypes/Graph/graph.rb', line 70 def is_connected?(v1, v2) raise "not a vertex" unless v1.is_a?(Vertex) && v2.is_a?(Vertex) v1.connections.include?(v2) end |
#make_connection(v1, v2) ⇒ Object
Make an edge between two vertices
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# File 'lib/zadt/AbstractDataTypes/Graph/graph.rb', line 46 def make_connection(v1, v2) raise "not a vertex" unless v1.is_a?(Vertex) && v2.is_a?(Vertex) raise "already connected" if is_connected?(v1, v2) # Make new edge edge = Edge.new(v1, v2) # Connect the two using the vertex method "connect" v1.connect(v2, edge) v2.connect(v1, edge) # Add to edge catalog @edges << edge edge end |
#remove_vertex(vertex) ⇒ Object
Remove a vertex
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# File 'lib/zadt/AbstractDataTypes/Graph/graph.rb', line 31 def remove_vertex(vertex) # The vertex must exist raise "not a vertex" unless vertex.is_a?(Vertex) if !vertex raise "Vertex does not exist" # The vertex must not be connected to anything elsif !vertex.connections.empty? raise "Vertex has edges. Break them first." # If it exists and isn't connected, delete it else @vertices.delete(vertex) end end |