Provided by: libgv-tcl_2.40.1-2_amd64 
NAME
gv_tcl - graph manipulation in tcl
SYNOPSIS
#!/usr/bin/tclsh
package require gv
USAGE
Requires tcl8.3 or later.
INTRODUCTION
gv_tcl is a dynamically loaded extension for tcl that provides access to the graph
facilities of graphviz.
COMMANDS
New graphs
New empty graph
<graph_handle> gv::graph <name>
<graph_handle> gv::digraph <name>
<graph_handle> gv::strictgraph <name>
<graph_handle> gv::strictdigraph <name>
New graph from a dot-syntax string or file
<graph_handle> gv::readstring <string>
<graph_handle> gv::read <string> filename
<graph_handle> gv::read <channel>
Add new subgraph to existing graph
<graph_handle> gv::graph <graph_handle> <name>
New nodes
Add new node to existing graph
<node_handle> gv::node <graph_handle> <name>
New edges
Add new edge between existing nodes
<edge_handle> gv::edge <tail_node_handle> <head_node_handle>
Add a new edge between an existing tail node, and a named head node which will be induced
in the graph if it doesn't already exist
<edge_handle> gv::edge <tail_node_handle> <head_name>
Add a new edge between an existing head node, and a named tail node which will be induced
in the graph if it doesn't already exist
<edge_handle> gv::edge <tail_name> <head_node_handle>
Add a new edge between named tail and head nodes which will be induced in the graph if
they don't already exist
<edge_handle> gv::edge <graph_handle> <tail_name> <head_name>
Setting attribute values
Set value of named attribute of graph/node/edge - creating attribute if necessary
<string> gv::setv <graph_handle> <attr_name> <attr_value>
<string> gv::setv <node_handle> <attr_name> <attr_value>
<string> gv::setv <edge_handle> <attr_name> <attr_value>
Set value of existing attribute of graph/node/edge (using attribute handle)
<string> gv::setv <graph_handle> <attr_handle> <attr_value>
<string> gv::setv <node_handle> <attr_handle> <attr_value>
<string> gv::setv <edge_handle> <attr_handle> <attr_value>
Getting attribute values
Get value of named attribute of graph/node/edge
<string> gv::getv <graph_handle> <attr_name>
<string> gv::getv <node_handle> <attr_name>
<string> gv::getv <edge_handle> <attr_name>
Get value of attribute of graph/node/edge (using attribute handle)
<string> gv::getv <graph_handle> <attr_handle>
<string> gv::getv <node_handle> <attr_handle>
<string> gv::getv <edge_handle> <attr_handle>
Obtain names from handles
<string> gv::nameof <graph_handle>
<string> gv::nameof <node_handle>
<string> gv::nameof <attr_handle>
Find handles from names
<graph_handle> gv::findsubg <graph_handle> <name>
<node_handle> gv::findnode <graph_handle> <name>
<edge_handle> gv::findedge <tail_node_handle> <head_node_handle>
<attr_handle> gv::findattr <graph_handle> <name>
<attr_handle> gv::findattr <node_handle> <name>
<attr_handle> gv::findattr <edge_handle> <name>
Misc graph navigators returning handles
<node_handle> gv::headof <edge_handle>
<node_handle> gv::tailof <edge_handle>
<graph_handle> gv::graphof <graph_handle>
<graph_handle> gv::graphof <edge_handle>
<graph_handle> gv::graphof <node_handle>
<graph_handle> gv::rootof <graph_handle>
Obtain handles of proto node/edge for setting default attribute values
<node_handle> gv::protonode <graph_handle>
<edge_handle> gv::protoedge <graph_handle>
Iterators
Iteration termination tests
<boolean_string> gv::ok <graph_handle>
<boolean_string> gv::ok <node_handle>
<boolean_string> gv::ok <edge_handle>
<boolean_string> gv::ok <attr_handle>
Iterate over subgraphs of a graph
<graph_handle> gv::firstsubg <graph_handle>
<graph_handle> gv::nextsubg <graph_handle> <subgraph_handle>
Iterate over supergraphs of a graph (obscure and rarely useful)
<graph_handle> gv::firstsupg <graph_handle>
<graph_handle> gv::nextsupg <graph_handle> <subgraph_handle>
Iterate over edges of a graph
<edge_handle> gv::firstedge <graph_handle>
<edge_handle> gv::nextedge <graph_handle> <edge_handle>
Iterate over outedges of a graph
<edge_handle> gv::firstout <graph_handle>
<edge_handle> gv::nextout <graph_handle> <edge_handle>
Iterate over edges of a node
<edge_handle> gv::firstedge <node_handle>
<edge_handle> gv::nextedge <node_handle> <edge_handle>
Iterate over out-edges of a node
<edge_handle> gv::firstout <node_handle>
<edge_handle> gv::nextout <node_handle> <edge_handle>
Iterate over head nodes reachable from out-edges of a node
<node_handle> gv::firsthead <node_handle>
<node_handle> gv::nexthead <node_handle> <head_node_handle>
Iterate over in-edges of a graph
<edge_handle> gv::firstin <graph_handle>
<edge_handle> gv::nextin <node_handle> <edge_handle>
Iterate over in-edges of a node
<edge_handle> gv::firstin <node_handle>
<edge_handle> gv::nextin <graph_handle> <edge_handle>
Iterate over tail nodes reachable from in-edges of a node
<node_handle> gv::firsttail <node_handle>
<node_handle> gv::nexttail <node_handle> <tail_node_handle>
Iterate over nodes of a graph
<node_handle> gv::firstnode <graph_handle>
<node_handle> gv::nextnode <graph_handle> <node_handle>
Iterate over nodes of an edge
<node_handle> gv::firstnode <edge_handle>
<node_handle> gv::nextnode <edge_handle> <node_handle>
Iterate over attributes of a graph
<attr_handle> gv::firstattr <graph_handle>
<attr_handle> gv::nextattr <graph_handle> <attr_handle>
Iterate over attributes of an edge
<attr_handle> gv::firstattr <edge_handle>
<attr_handle> gv::nextattr <edge_handle> <attr_handle>
Iterate over attributes of a node
<attr_handle> gv::firstattr <node_handle>
<attr_handle> gv::nextattr <node_handle> <attr_handle>
Remove graph objects
<boolean_string> gv::rm <graph_handle>
<boolean_string> gv::rm <node_handle>
<boolean_string> gv::rm <edge_handle>
Layout
Annotate a graph with layout attributes and values using a specific layout engine
<boolean_string> gv::layout <graph_handle> <string> engine
Render
Render a layout into attributes of the graph
<boolean_string> gv::render <graph_handle>
Render a layout to stdout
<boolean_string> gv::render <graph_handle> <string> format
Render to an open file
<boolean_string> gv::render <graph_handle> <string> format <channel> fout
Render a layout to an unopened file by name
<boolean_string> gv::render <graph_handle> <string> format <string> filename
Render to a string result
<string> gv::renderresult <graph_handle> ing <string> format
gv::renderresult <graph_handle> <string> format <string> outdata
Render to an open channel
<boolean_string> gv::renderchannel <graph_handle> <string> format <string>
channelname
Render a layout to a malloc'ed string, to be free'd by the caller
(deprecated - too easy to leak memory)
(still needed for "eval [gv::renderdata $G tk]" )
<string> gv::renderdata <graph_handle> <string> format
Writing graph back to file
<boolean_string> gv::write <graph_handle> <string> filename
<boolean_string> gv::write <graph_handle> <channel>
Graph transformation tools
<boolean_string> gv::tred <graph_handle>
KEYWORDS
graph, dot, neato, fdp, circo, twopi, tcl.
25 March 2018 gv(3tcl)