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+:mod:`altgraph.Dot` --- Interface to the dot language
+=====================================================
+
+.. module:: altgraph.Dot
+   :synopsis: Interface to the dot language as used by Graphviz..
+
+The :py:mod:`~altgraph.Dot` module provides a simple interface to the
+file format used in the `graphviz`_ program. The module is intended to 
+offload the most tedious part of the process (the **dot** file generation) 
+while transparently exposing most of its features.
+
+.. _`graphviz`: <http://www.research.att.com/sw/tools/graphviz/>`_
+
+To display the graphs or to generate image files the `graphviz`_
+package needs to be installed on the system, moreover the :command:`dot` and :command:`dotty` programs must
+be accesible in the program path so that they can be ran from processes spawned
+within the module. 
+
+Example usage
+-------------
+
+Here is a typical usage::
+
+    from altgraph import Graph, Dot
+
+    # create a graph
+    edges = [ (1,2), (1,3), (3,4), (3,5), (4,5), (5,4) ]
+    graph = Graph.Graph(edges)
+    
+    # create a dot representation of the graph
+    dot = Dot.Dot(graph)
+
+    # display the graph
+    dot.display()
+
+    # save the dot representation into the mydot.dot file
+    dot.save_dot(file_name='mydot.dot')
+
+    # save dot file as gif image into the graph.gif file
+    dot.save_img(file_name='graph', file_type='gif')
+
+
+Directed graph and non-directed graph
+-------------------------------------
+
+Dot class can use for both directed graph and non-directed graph
+by passing *graphtype* parameter.
+
+Example::
+
+    # create directed graph(default)
+    dot = Dot.Dot(graph, graphtype="digraph")
+
+    # create non-directed graph
+    dot = Dot.Dot(graph, graphtype="graph")
+
+
+Customizing the output
+----------------------
+
+The graph drawing process may be customized by passing
+valid :command:`dot` parameters for the nodes and edges. For a list of all
+parameters see the `graphviz`_ documentation.
+
+Example::
+
+    # customizing the way the overall graph is drawn
+    dot.style(size='10,10', rankdir='RL', page='5, 5' , ranksep=0.75)
+
+    # customizing node drawing
+    dot.node_style(1, label='BASE_NODE',shape='box', color='blue' )
+    dot.node_style(2, style='filled', fillcolor='red')
+
+    # customizing edge drawing
+    dot.edge_style(1, 2, style='dotted')
+    dot.edge_style(3, 5, arrowhead='dot', label='binds', labelangle='90')
+    dot.edge_style(4, 5, arrowsize=2, style='bold')
+
+
+    .. note:: 
+       
+       dotty (invoked via :py:func:`~altgraph.Dot.display`) may not be able to
+       display all graphics styles. To verify the output save it to an image 
+       file and look at it that way.
+
+Valid attributes
+----------------
+
+- dot styles, passed via the :py:meth:`Dot.style` method::
+
+    rankdir = 'LR'   (draws the graph horizontally, left to right)
+    ranksep = number (rank separation in inches)
+
+- node attributes, passed via the :py:meth:`Dot.node_style` method::
+
+     style = 'filled' | 'invisible' | 'diagonals' | 'rounded'
+     shape = 'box' | 'ellipse' | 'circle' | 'point' | 'triangle'
+
+- edge attributes, passed via the :py:meth:`Dot.edge_style` method::
+
+     style     = 'dashed' | 'dotted' | 'solid' | 'invis' | 'bold'
+     arrowhead = 'box' | 'crow' | 'diamond' | 'dot' | 'inv' | 'none' | 'tee' | 'vee'
+     weight    = number (the larger the number the closer the nodes will be)
+
+- valid `graphviz colors <http://www.research.att.com/~erg/graphviz/info/colors.html>`_
+
+- for more details on how to control the graph drawing process see the 
+  `graphviz reference <http://www.research.att.com/sw/tools/graphviz/refs.html>`_.
+
+
+Class interface
+---------------
+
+.. class:: Dot(graph[, nodes[, edgefn[, nodevisitor[, edgevisitor[, name[, dot[, dotty[, neato[, graphtype]]]]]]]]])
+
+  Creates a new Dot generator based on the specified 
+  :class:`Graph <altgraph.Graph.Graph>`.  The Dot generator won't reference
+  the *graph* once it is constructed.
+
+  If the *nodes* argument is present it is the list of nodes to include
+  in the graph, otherwise all nodes in *graph* are included.
+  
+  If the *edgefn* argument is present it is a function that yields the
+  nodes connected to another node, this defaults to 
+  :meth:`graph.out_nbr <altgraph.Graph.Graph.out_nbr>`. The constructor won't
+  add edges to the dot file unless both the head and tail of the edge
+  are in *nodes*.
+
+  If the *name* is present it specifies the name of the graph in the resulting
+  dot file. The default is ``"G"``.
+
+  The functions *nodevisitor* and *edgevisitor* return the default style
+  for a given edge or node (both default to functions that return an empty
+  style).
+
+  The arguments *dot*, *dotty* and *neato* are used to pass the path to 
+  the corresponding `graphviz`_ command.
+
+
+Updating graph attributes
+.........................
+
+.. method:: Dot.style(\**attr)
+
+   Sets the overall style (graph attributes) to the given attributes.
+
+   See `Valid Attributes`_ for more information about the attributes.
+
+.. method:: Dot.node_style(node, \**attr)
+
+   Sets the style for *node* to the given attributes.
+
+   This method will add *node* to the graph when it isn't already 
+   present.
+
+   See `Valid Attributes`_ for more information about the attributes.
+
+.. method:: Dot.all_node_style(\**attr)
+
+   Replaces the current style for all nodes
+
+
+.. method:: edge_style(head, tail, \**attr)
+
+   Sets the style of an edge to the given attributes. The edge will
+   be added to the graph when it isn't already present, but *head*
+   and *tail* must both be valid nodes.
+
+   See `Valid Attributes`_ for more information about the attributes.
+
+
+
+Emitting output
+...............
+
+.. method:: Dot.display([mode])
+
+   Displays the current graph via dotty.
+
+   If the *mode* is ``"neato"`` the dot file is processed with
+   the neato command before displaying.
+
+   This method won't return until the dotty command exits.
+
+.. method:: save_dot(filename)
+
+   Saves the current graph representation into the given file.
+
+   .. note::
+
+       For backward compatibility reasons this method can also
+       be called without an argument, it will then write the graph
+       into a fixed filename (present in the attribute :data:`Graph.temp_dot`).
+
+       This feature is deprecated and should not be used.
+
+
+.. method:: save_image(file_name[, file_type[, mode]])
+
+   Saves the current graph representation as an image file. The output
+   is written into a file whose basename is *file_name* and whose suffix
+   is *file_type*.
+
+   The *file_type* specifies the type of file to write, the default
+   is ``"gif"``.
+
+   If the *mode* is ``"neato"`` the dot file is processed with
+   the neato command before displaying.
+
+   .. note::
+
+       For backward compatibility reasons this method can also
+       be called without an argument, it will then write the graph
+       with a fixed basename (``"out"``).
+
+       This feature is deprecated and should not be used.
+
+.. method:: iterdot()
+
+   Yields all lines of a `graphviz`_ input file (including line endings).
+
+.. method:: __iter__()
+
+   Alias for the :meth:`iterdot` method.