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altgraph.Dot - Interface to the dot language
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============================================
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The :py:mod:`~altgraph.Dot` module provides a simple interface to the
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file format used in the
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`graphviz <http://www.research.att.com/sw/tools/graphviz/>`_
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program. The module is intended to offload the most tedious part of the process
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(the **dot** file generation) while transparently exposing most of its
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features.
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To display the graphs or to generate image files the
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`graphviz <http://www.research.att.com/sw/tools/graphviz/>`_
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package needs to be installed on the system, moreover the :command:`dot` and
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:command:`dotty` programs must be accesible in the program path so that they
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can be ran from processes spawned within the module.
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Example usage
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-------------
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Here is a typical usage::
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from altgraph import Graph, Dot
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# create a graph
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edges = [ (1,2), (1,3), (3,4), (3,5), (4,5), (5,4) ]
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graph = Graph.Graph(edges)
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# create a dot representation of the graph
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dot = Dot.Dot(graph)
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# display the graph
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dot.display()
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# save the dot representation into the mydot.dot file
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dot.save_dot(file_name='mydot.dot')
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# save dot file as gif image into the graph.gif file
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dot.save_img(file_name='graph', file_type='gif')
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Directed graph and non-directed graph
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-------------------------------------
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Dot class can use for both directed graph and non-directed graph
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by passing ``graphtype`` parameter.
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Example::
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# create directed graph(default)
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dot = Dot.Dot(graph, graphtype="digraph")
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# create non-directed graph
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dot = Dot.Dot(graph, graphtype="graph")
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Customizing the output
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----------------------
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The graph drawing process may be customized by passing
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valid :command:`dot` parameters for the nodes and edges. For a list of all
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parameters see the `graphviz <http://www.research.att.com/sw/tools/graphviz/>`_
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documentation.
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Example::
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# customizing the way the overall graph is drawn
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dot.style(size='10,10', rankdir='RL', page='5, 5' , ranksep=0.75)
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# customizing node drawing
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dot.node_style(1, label='BASE_NODE',shape='box', color='blue' )
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dot.node_style(2, style='filled', fillcolor='red')
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# customizing edge drawing
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dot.edge_style(1, 2, style='dotted')
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dot.edge_style(3, 5, arrowhead='dot', label='binds', labelangle='90')
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dot.edge_style(4, 5, arrowsize=2, style='bold')
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.. note::
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dotty (invoked via :py:func:`~altgraph.Dot.display`) may not be able to
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display all graphics styles. To verify the output save it to an image file
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and look at it that way.
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Valid attributes
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----------------
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- dot styles, passed via the :py:meth:`Dot.style` method::
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rankdir = 'LR' (draws the graph horizontally, left to right)
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ranksep = number (rank separation in inches)
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- node attributes, passed via the :py:meth:`Dot.node_style` method::
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style = 'filled' | 'invisible' | 'diagonals' | 'rounded'
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shape = 'box' | 'ellipse' | 'circle' | 'point' | 'triangle'
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- edge attributes, passed via the :py:meth:`Dot.edge_style` method::
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style = 'dashed' | 'dotted' | 'solid' | 'invis' | 'bold'
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arrowhead = 'box' | 'crow' | 'diamond' | 'dot' | 'inv' | 'none'
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| 'tee' | 'vee'
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weight = number (the larger the number the closer the nodes will be)
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- valid `graphviz colors
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<http://www.research.att.com/~erg/graphviz/info/colors.html>`_
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- for more details on how to control the graph drawing process see the
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`graphviz reference
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<http://www.research.att.com/sw/tools/graphviz/refs.html>`_.
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é N)Ú
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GraphErrorc óh e Zd ZdZ d dZd ZddZd Zd Zd Z d Z
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A class providing a **graphviz** (dot language) representation
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allowing a fine grained control over how the graph is being
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displayed.
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If the :command:`dot` and :command:`dotty` programs are not in the current
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system path their location needs to be specified in the contructor.
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