1gv(3guile) gv(3guile)
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6 gv_guile - graph manipulation in guile
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10 (load-extension "./libgv.so" "SWIG_init")
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15 gv_guile is a dynamically loaded extension for guile that provides ac‐
16 cess to the graph facilities of graphviz.
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20 New graphs
21 New empty graph
23 graph_handle gv.graph (name);
24 graph_handle gv.digraph (name);
25 graph_handle gv.strictgraph (name);
26 graph_handle gv.strictdigraph (name);
27 New graph from a dot-syntax string or file
29 graph_handle gv.readstring (string);
30 graph_handle gv.read (string filename);
31 graph_handle gv.read (channel);
32 Add new subgraph to existing graph
34 graph_handle gv.graph (graph_handle, name);
35 New nodes
37 Add new node to existing graph
39 node_handle gv.node (graph_handle, name);
40 New edges
42 Add new edge between existing nodes
44 edge_handle gv.edge (tail_node_handle, head_node_handle);
45 Add a new edge between an existing tail node, and a named head node
47 which will be induced in the graph if it doesn't already exist
48 edge_handle gv.edge (tail_node_handle, head_name);
49 Add a new edge between an existing head node, and a named tail node
51 which will be induced in the graph if it doesn't already exist
52 edge_handle gv.edge (tail_name, head_node_handle);
53 Add a new edge between named tail and head nodes which will be induced
55 in the graph if they don't already exist
56 edge_handle gv.edge (graph_handle, tail_name, head_name);
57 Setting attribute values
59 Set value of named attribute of graph/node/edge - creating attribute if
61 necessary
62 string gv.setv (graph_handle, attr_name, attr_value);
63 string gv.setv (node_handle, attr_name, attr_value);
64 string gv.setv (edge_handle, attr_name, attr_value);
65 Set value of existing attribute of graph/node/edge (using attribute
67 handle)
68 string gv.setv (graph_handle, attr_handle, attr_value);
69 string gv.setv (node_handle, attr_handle, attr_value);
70 string gv.setv (edge_handle, attr_handle, attr_value);
71 Getting attribute values
73 Get value of named attribute of graph/node/edge
75 string gv.getv (graph_handle, attr_name);
76 string gv.getv (node_handle, attr_name);
77 string gv.getv (edge_handle, attr_name);
78 Get value of attribute of graph/node/edge (using attribute handle)
80 string gv.getv (graph_handle, attr_handle);
81 string gv.getv (node_handle, attr_handle);
82 string gv.getv (edge_handle, attr_handle);
83 Obtain names from handles
85 string gv.nameof (graph_handle);
86 string gv.nameof (node_handle);
87 string gv.nameof (attr_handle);
88 Find handles from names
90 graph_handle gv.findsubg (graph_handle, name);
91 node_handle gv.findnode (graph_handle, name);
92 edge_handle gv.findedge (tail_node_handle, head_node_handle);
93 attribute_handle gv.findattr (graph_handle, name);
94 attribute_handle gv.findattr (node_handle, name);
95 attribute_handle gv.findattr (edge_handle, name);
96 Misc graph navigators returning handles
98 node_handle gv.headof (edge_handle);
99 node_handle gv.tailof (edge_handle);
100 graph_handle gv.graphof (graph_handle);
101 graph_handle gv.graphof (edge_handle);
102 graph_handle gv.graphof (node_handle);
103 graph_handle gv.rootof (graph_handle);
104 Obtain handles of proto node/edge for setting default attribute values
106 node_handle gv.protonode (graph_handle);
107 edge_handle gv.protoedge (graph_handle);
108 Iterators
110 Iteration termination tests
112 bool gv.ok (graph_handle);
113 bool gv.ok (node_handle);
114 bool gv.ok (edge_handle);
115 bool gv.ok (attr_handle);
116 Iterate over subgraphs of a graph
118 graph_handle gv.firstsubg (graph_handle);
119 graph_handle gv.nextsubg (graph_handle, subgraph_handle);
120 Iterate over supergraphs of a graph (obscure and rarely useful)
122 graph_handle gv.firstsupg (graph_handle);
123 graph_handle gv.nextsupg (graph_handle, subgraph_handle);
124 Iterate over edges of a graph
126 edge_handle gv.firstedge (graph_handle);
127 edge_handle gv.nextedge (graph_handle, edge_handle);
128 Iterate over outedges of a graph
130 edge_handle gv.firstout (graph_handle);
131 edge_handle gv.nextout (graph_handle, edge_handle);
132 Iterate over edges of a node
134 edge_handle gv.firstedge (node_handle);
135 edge_handle gv.nextedge (node_handle, edge_handle);
136 Iterate over out-edges of a node
138 edge_handle gv.firstout (node_handle);
139 edge_handle gv.nextout (node_handle, edge_handle);
140 Iterate over head nodes reachable from out-edges of a node
142 node_handle gv.firsthead (node_handle);
143 node_handle gv.nexthead (node_handle, head_node_handle);
144 Iterate over in-edges of a graph
146 edge_handle gv.firstin (graph_handle);
147 edge_handle gv.nextin (node_handle, edge_handle);
148 Iterate over in-edges of a node
150 edge_handle gv.firstin (node_handle);
151 edge_handle gv.nextin (graph_handle, edge_handle);
152 Iterate over tail nodes reachable from in-edges of a node
154 node_handle gv.firsttail (node_handle);
155 node_handle gv.nexttail (node_handle, tail_node_handle);
156 Iterate over nodes of a graph
158 node_handle gv.firstnode (graph_handle);
159 node_handle gv.nextnode (graph_handle, node_handle);
160 Iterate over nodes of an edge
162 node_handle gv.firstnode (edge_handle);
163 node_handle gv.nextnode (edge_handle, node_handle);
164 Iterate over attributes of a graph
166 attribute_handle gv.firstattr (graph_handle);
167 attribute_handle gv.nextattr (graph_handle, attr_handle);
168 Iterate over attributes of an edge
170 attribute_handle gv.firstattr (edge_handle);
171 attribute_handle gv.nextattr (edge_handle, attr_handle);
172 Iterate over attributes of a node
174 attribute_handle gv.firstattr (node_handle);
175 attribute_handle gv.nextattr (node_handle, attr_handle);
176 Remove graph objects
178 bool gv.rm (graph_handle);
179 bool gv.rm (node_handle);
180 bool gv.rm (edge_handle);
181 Layout
183 Annotate a graph with layout attributes and values using a specific
185 layout engine
186 bool gv.layout (graph_handle, string engine);
187 Render
189 Render a layout into attributes of the graph
191 bool gv.render (graph_handle);
192 Render a layout to stdout
194 bool gv.render (graph_handle, string format);
195 Render to an open file
197 bool gv.render (graph_handle, string format, channel fout);
198 Render a layout to an unopened file by name
200 bool gv.render (graph_handle, string format, string filename);
201 Render to a string result
203 string gv.renderresult (graph_handle ing, string format);
204 gv.renderresult (graph_handle, string format, string outdata);
205 Render to an open channel
207 bool gv.renderchannel (graph_handle, string format, string chan‐
208 nelname);
209 Render a layout to a malloc'ed string, to be free'd by the caller
211 (deprecated - too easy to leak memory)
213 (still needed for "eval [gv::renderdata $G tk]" )
215 string gv.renderdata (graph_handle, string format);
216 Writing graph back to file
218 bool gv.write (graph_handle, string filename);
219 bool gv.write (graph_handle, channel);
220 Graph transformation tools
222 bool gv.tred (graph_handle);
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226 graph, dot, neato, fdp, circo, twopi, guile.
227 21 July 2022 gv(3guile)