コード例 #1
0
ファイル: agraph.py プロジェクト: amccool/django-giftregistry
    def add_node(self, n, **attr):
        """Add a single node n.

        If n is not a string, conversion to a string will be attempted.
        String conversion will work if n has valid string representation
        (try str(n) if you are unsure).

        >>> G=AGraph()
        >>> G.add_node('a')
        >>> G.nodes()
        ['a']
        >>> G.add_node(1) # will be converted to a string
        >>> G.nodes()
        ['a', '1']
        
        Attributes can be added to nodes on creation
        (attribute values must be strings)

        >>> G.add_node(2,color='red')

        See http://www.graphviz.org/doc/info/attrs.html
        for a list of attributes.

        Anonymous Graphviz nodes are currently not implemented.

        """
        if not self._is_string_like(n):  n=str(n)
        n=n.encode(self.charset)
        try:
            nh=gv.agnode(self.handle,n,_Action.find)
        except KeyError:
            nh=gv.agnode(self.handle,n,_Action.create)
            node=Node(self,nh=nh)
            node.attr.update(**attr)
コード例 #2
0
ファイル: agraph.py プロジェクト: amccool/django-giftregistry
 def __new__(self,graph,name=None,nh=None):
     if nh is not None:
         n=str.__new__(self,gv.agnameof(nh))
     else:
         n=str.__new__(self,name)
         try:
             nh=gv.agnode(graph.handle,n,_Action.find)
         except KeyError:
             raise KeyError("Node %s not in graph."%n)
         
     n.ghandle=graph.handle
     n.attr=ItemAttribute(nh,1)
     n.handle=nh
     return n
コード例 #3
0
ファイル: agraph.py プロジェクト: amccool/django-giftregistry
    def remove_node(self,n):
        """Remove the single node n.

        Attempting to remove a node that isn't in the graph will produce
        an error.
        
        >>> G=AGraph()
        >>> G.add_node('a')
        >>> G.remove_node('a')

        """
        if not self._is_string_like(n):  n=str(n)
        try:
            nh=gv.agnode(self.handle,n,_Action.find)
            gv.agdelnode(self.handle,nh)
        except KeyError:
            raise KeyError("Node %s not in graph."%n)
コード例 #4
0
ファイル: agraph.py プロジェクト: amccool/django-giftregistry
 def get_handle(self):
     """Return pointer to graphviz node object.""" 
     return gv.agnode(self.ghandle,self,_Action.find)