~ubuntu-branches/ubuntu/maverick/yapgvb/maverick : revision 1

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yapgvb

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</p></th></tr></table>

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<a href="yapgvb-module.html">Package yapgvb</a> ::

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Class Node

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</b></font></br>

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</td>

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<tr><td align="right"><font size="-2">[<a href="../private/yapgvb.Node-class.html">show private</a> | hide private]</font></td></tr>

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<tr><td align="right"><font size="-2">[<a href="frames.html"target="_top">frames</a> | <a href="yapgvb.Node-class.html" target="_top">no frames</a>]</font></td></tr>

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</table></td>

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</tr></table>

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<h2 class="class">Class Node</h2>

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<hr/>

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<p>Nodes are created by calling Graph.add_node.</p>

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Edges can be created through the use of overloaded operators -,

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<<, and >>.

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<hr/>

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<th colspan="2">Property Summary</th></tr>

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<td><b><a href="yapgvb.Node-class.html#color"><code>color</code></a></b>: Basic drawing color for graphics, not text.</td></tr><tr><td align="right" valign="top" width="15%"><font size="-1">str</font></td>

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<td><b><a href="yapgvb.Node-class.html#colorscheme"><code>colorscheme</code></a></b>: This attribute specifies a color scheme namespace.</td></tr><tr><td align="right" valign="top" width="15%"><font size="-1">str</font></td>

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<td><b><a href="yapgvb.Node-class.html#comment"><code>comment</code></a></b>: Comments are inserted into output.</td></tr><tr><td align="right" valign="top" width="15%"><font size="-1">float</font></td>

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<td><b><a href="yapgvb.Node-class.html#distortion"><code>distortion</code></a></b>: Distortion factor for shape=polygon.</td></tr><tr><td align="right" valign="top" width="15%"><font size="-1">str</font></td>

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<td><b><a href="yapgvb.Node-class.html#fillcolor"><code>fillcolor</code></a></b>: Color used to fill the background of a node or cluster.</td></tr><tr><td align="right" valign="top" width="15%"><font size="-1">boolean</font></td>

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<td><b><a href="yapgvb.Node-class.html#fixedsize"><code>fixedsize</code></a></b>: If true, the node size is specified by the values of the width and

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height attributes only and is not expanded to contain the text label.</td></tr><tr><td align="right" valign="top" width="15%"><font size="-1">str</font></td>

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<td><b><a href="yapgvb.Node-class.html#fontcolor"><code>fontcolor</code></a></b>: Color used for text.</td></tr><tr><td align="right" valign="top" width="15%"><font size="-1">str</font></td>

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<td><b><a href="yapgvb.Node-class.html#fontname"><code>fontname</code></a></b>: Font used for text.</td></tr><tr><td align="right" valign="top" width="15%"><font size="-1">float</font></td>

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<td><b><a href="yapgvb.Node-class.html#fontsize"><code>fontsize</code></a></b>: Font size, in points, used for text.</td></tr><tr><td align="right" valign="top" width="15%"><font size="-1">str</font></td>

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<td><b><a href="yapgvb.Node-class.html#group"><code>group</code></a></b>: If the end points of an edge belong to the same group, i.e., have the

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same group attribute, parameters are set to avoid crossings and keep the

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edges straight.</td></tr><tr><td align="right" valign="top" width="15%"><font size="-1">float</font></td>

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<td><b><a href="yapgvb.Node-class.html#height"><code>height</code></a></b>: Height of node, in inches.</td></tr><tr><td align="right" valign="top" width="15%"><font size="-1">str</font></td>

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<td><b><a href="yapgvb.Node-class.html#label"><code>label</code></a></b>: Text label attached to objects.</td></tr><tr><td align="right" valign="top" width="15%"><font size="-1">str</font></td>

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<td><b><a href="yapgvb.Node-class.html#layer"><code>layer</code></a></b>: Specifies layers in which the node or edge is present.</td></tr><tr><td align="right" valign="top" width="15%"><font size="-1">float</font></td>

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<td><b><a href="yapgvb.Node-class.html#margin"><code>margin</code></a></b>: For graphs, this sets x and y margins of canvas, in inches.</td></tr><tr><td align="right" valign="top" width="15%"><font size="-1">boolean</font></td>

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<td><b><a href="yapgvb.Node-class.html#nojustify"><code>nojustify</code></a></b>: By default, the justification of multi-line labels is done within the

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largest context that makes sense.</td></tr><tr><td align="right" valign="top" width="15%"><font size="-1">float</font></td>

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<td><b><a href="yapgvb.Node-class.html#orientation"><code>orientation</code></a></b>: Angle, in degrees, used to rotate node shapes.</td></tr><tr><td align="right" valign="top" width="15%"><font size="-1">int</font></td>

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<td><b><a href="yapgvb.Node-class.html#peripheries"><code>peripheries</code></a></b>: Set number of peripheries used in polygonal shapes and cluster

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boundaries.</td></tr><tr><td align="right" valign="top" width="15%"><font size="-1">boolean</font></td>

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<td><b><a href="yapgvb.Node-class.html#pin"><code>pin</code></a></b>: If true and the node has a pos attribute on input, neato prevents the

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node from moving from the input position.</td></tr><tr><td align="right" valign="top" width="15%"><font size="-1">(x,y) or (x,y,z) tuple</font></td>

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<td><b><a href="yapgvb.Node-class.html#pos"><code>pos</code></a></b>: Position of node, or spline control points, in points.</td></tr><tr><td align="right" valign="top" width="15%"><font size="-1">rect</font></td>

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<td><b><a href="yapgvb.Node-class.html#rects"><code>rects</code></a></b>: Rectangles for fields of records, in points.</td></tr><tr><td align="right" valign="top" width="15%"><font size="-1">boolean</font></td>

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<td><b><a href="yapgvb.Node-class.html#regular"><code>regular</code></a></b>: If true, force polygon to be regular.</td></tr><tr><td align="right" valign="top" width="15%"><font size="-1">boolean</font></td>

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<td><b><a href="yapgvb.Node-class.html#root"><code>root</code></a></b>: This specifies nodes to be used as the center of the layout and the

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root of the generated spanning tree.</td></tr><tr><td align="right" valign="top" width="15%"><font size="-1">string</font></td>

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<td><b><a href="yapgvb.Node-class.html#shape"><code>shape</code></a></b>: Set the shape of a node.</td></tr><tr><td align="right" valign="top" width="15%"><font size="-1">str</font></td>

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<td><b><a href="yapgvb.Node-class.html#shapefile"><code>shapefile</code></a></b>: If defined, shapefile specifies a file containing user-supplied node

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content.</td></tr><tr><td align="right" valign="top" width="15%"><font size="-1">int</font></td>

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<td><b><a href="yapgvb.Node-class.html#showboxes"><code>showboxes</code></a></b>: Print guide boxes in PostScript at the beginning of routesplines if 1,

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or at the end if 2.</td></tr><tr><td align="right" valign="top" width="15%"><font size="-1">int</font></td>

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<td><b><a href="yapgvb.Node-class.html#sides"><code>sides</code></a></b>: Number of sides if shape=polygon.</td></tr><tr><td align="right" valign="top" width="15%"><font size="-1">float</font></td>

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<td><b><a href="yapgvb.Node-class.html#skew"><code>skew</code></a></b>: Skew factor for shape=polygon.</td></tr><tr><td align="right" valign="top" width="15%"><font size="-1">str</font></td>

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<td><b><a href="yapgvb.Node-class.html#style"><code>style</code></a></b>: Set style for node or edge.</td></tr><tr><td align="right" valign="top" width="15%"><font size="-1">str</font></td>

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<td><b><a href="yapgvb.Node-class.html#target"><code>target</code></a></b>: If the object has a URL, this attribute determines which window of the

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browser is used for the URL.</td></tr><tr><td align="right" valign="top" width="15%"><font size="-1">str</font></td>

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<td><b><a href="yapgvb.Node-class.html#tooltip"><code>tooltip</code></a></b>: Tooltip annotation attached to the node or edge.</td></tr><tr><td align="right" valign="top" width="15%"><font size="-1"> </font></td>

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<td><b><a href="yapgvb.Node-class.html#URL"><code>URL</code></a></b>: Hyperlinks incorporated into device-dependent output.</td></tr><tr><td align="right" valign="top" width="15%"><font size="-1">str</font></td>

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<td><b><a href="yapgvb.Node-class.html#vertices"><code>vertices</code></a></b>: If the input graph defines this attribute, the node is polynomial, and

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output is dot or xdot, this attribute provides the coordinates of the

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vertices of the node's polynomial, in inches.</td></tr><tr><td align="right" valign="top" width="15%"><font size="-1">float</font></td>

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<td><b><a href="yapgvb.Node-class.html#width"><code>width</code></a></b>: Width of node, in inches.</td></tr><tr><td align="right" valign="top" width="15%"><font size="-1">float</font></td>

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<td><b><a href="yapgvb.Node-class.html#z"><code>z</code></a></b>: Provides z coordinate value for 3D layouts and displays.</td></tr><tr bgcolor="#e8f0f8" class="group">

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<th colspan="2">    Graph Definition</th></tr>

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<td><b><a href="yapgvb.Node-class.html#__sub__"><code>__sub__</code></a></b>: The syntax tail_node - head_node creates an undirected edge between

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two nodes.</td></tr><tr><td align="right" valign="top" width="15%"><font size="-1"> </font></td>

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<td><b><a href="yapgvb.Node-class.html#__lshift__"><code>__lshift__</code></a></b>: The syntax head_node << tail_node creates a directed edge

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between two nodes.</td></tr><tr><td align="right" valign="top" width="15%"><font size="-1"> </font></td>

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<td><b><a href="yapgvb.Node-class.html#__rshift__"><code>__rshift__</code></a></b>: The syntax tail_node >> head_node creates a directed edge

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between two nodes.</td></tr><tr bgcolor="#e8f0f8" class="group">

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<th colspan="2">    Graph Traversal</th></tr>

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<td><a name="edges"></a><b><code>edges</code></b></td></tr><tr><td align="right" valign="top" width="15%"><font size="-1"> </font></td>

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<td><a name="inbound_edges"></a><b><code>inbound_edges</code></b></td></tr><tr><td align="right" valign="top" width="15%"><font size="-1"> </font></td>

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<td><a name="outbound_edges"></a><b><code>outbound_edges</code></b></td></tr><tr><td align="right" valign="top" width="15%"><font size="-1"> </font></td>

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<td><b><a href="yapgvb.Node-class.html#graph"><code>graph</code></a></b>: The graph to which a Node belongs.</td></tr></table><br />

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<th colspan="2">Property Details</th></tr>

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</table>

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The syntax tail_node - head_node creates an undirected edge between

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two nodes. It is a convenient short syntax for

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tail_node.graph.add_edge(tail_node, head_node). An Edge object is

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returned. This should only be used for undirected graphs; use <<

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and >> to create directed edges.

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</td></tr></table><table width="100%" class="func-details" bgcolor="#e0e0e0"><tr><td>

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<h3>__lshift__</h3>

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The syntax head_node << tail_node creates a directed edge

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between two nodes. It is a convenient short syntax for

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head_node.graph.add_edge(tail_node, head_node). An Edge object is

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returned. For undirected graphs, a << b is equivalent to a - b.

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</td></tr></table><table width="100%" class="func-details" bgcolor="#e0e0e0"><tr><td>

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<h3>__rshift__</h3>

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The syntax tail_node >> head_node creates a directed edge

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between two nodes. It is a convenient short syntax for

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tail_node.graph.add_edge(tail_node, head_node). An Edge object is

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returned. For undirected graphs, a >> b is equivalent to b - a.

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</td></tr></table><table width="100%" class="func-details" bgcolor="#e0e0e0"><tr><td>

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<h3>graph</h3>

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The graph to which a Node belongs.

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</td></tr></table><table width="100%" class="func-details" bgcolor="#e0e0e0"><tr><td>

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<h3>color</h3>

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<p>Basic drawing color for graphics, not text. For the latter, use the

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fontcolor attribute.</p>

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<p>For edges, the value can either be a single color or a colorList. In

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the latter case, the edge is drawn using parallel splines or lines, one

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for each color in the list, in the order given. The head arrow, if any,

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is drawn using the first color in the list, and the tail arrow, if any,

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the second color. This supports the common case of drawing opposing

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edges, but using parallel splines instead of separately routed

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multiedges. For example, the graph</p>

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<p>digraph G { a -> b [dir=both color="red:blue"] }</p>

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yields

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</td></tr></table><table width="100%" class="func-details" bgcolor="#e0e0e0"><tr><td>

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<h3>colorscheme</h3>

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This attribute specifies a color scheme namespace. If defined, it

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specifies the context for interpreting color names. In particular, if a

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color value has form "xxx" or "//xxx", then the color

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xxx will be evaluated according to the current color scheme. If no color

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scheme is set, the standard X11 naming is used. For example, if

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colorscheme=bugn9, then color=7 is interpreted as

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"/bugn9/7".

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</td></tr></table><table width="100%" class="func-details" bgcolor="#e0e0e0"><tr><td>

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<h3>comment</h3>

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Comments are inserted into output. Device-dependent

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</td></tr></table><table width="100%" class="func-details" bgcolor="#e0e0e0"><tr><td>

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<h3>distortion</h3>

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Distortion factor for shape=polygon. Positive values cause top part to

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be larger than bottom; negative values do the opposite.

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</td></tr></table><table width="100%" class="func-details" bgcolor="#e0e0e0"><tr><td>

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<h3>fillcolor</h3>

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<p>Color used to fill the background of a node or cluster. If fillcolor

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is not defined, color is used. (For clusters, if color is not defined,

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bgcolor is used.) If this is not defined, the default is used, except for

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shape=point or when the output format is MIF, which use black by

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default.</p>

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Note that a cluster inherits the root graph's attributes if defined.

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Thus, if the root graph has defined a fillcolor, this will override a

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color or bgcolor attribute set for the cluster.

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</td></tr></table><table width="100%" class="func-details" bgcolor="#e0e0e0"><tr><td>

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<h3>fixedsize</h3>

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If true, the node size is specified by the values of the width and

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height attributes only and is not expanded to contain the text label.

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</td></tr></table><table width="100%" class="func-details" bgcolor="#e0e0e0"><tr><td>

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<h3>fontcolor</h3>

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Color used for text.

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</td></tr></table><table width="100%" class="func-details" bgcolor="#e0e0e0"><tr><td>

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<h3>fontname</h3>

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<p>Font used for text. This very much depends on the output format and,

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for non-bitmap output such as PostScript or SVG, the availability of the

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font when the graph is displayed or printed. As such, it is best to rely

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on font faces that are generally available, such as Times-Roman,

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Helvetica or Courier.</p>

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<p>If Graphviz was built using the fontconfig library, the latter library

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will be used to search for the font. However, if the fontname string

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contains a slash character "/", it is treated as a pathname for

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the font file, though font lookup will append the usual font

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suffixes.</p>

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If Graphviz does not use fontconfig, fontname will be considered the

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name of a Type 1 or True Type font file. If you specify fontname=schlbk,

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the tool will look for a file named schlbk.ttf or schlbk.pfa or

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schlbk.pfb in one of the directories specified by the fontpath attribute.

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The lookup does support various aliases for the common fonts.

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</td></tr></table><table width="100%" class="func-details" bgcolor="#e0e0e0"><tr><td>

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<h3>fontsize</h3>

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Font size, in points, used for text.

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</td></tr></table><table width="100%" class="func-details" bgcolor="#e0e0e0"><tr><td>

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<h3>group</h3>

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If the end points of an edge belong to the same group, i.e., have the

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same group attribute, parameters are set to avoid crossings and keep the

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edges straight.

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</td></tr></table><table width="100%" class="func-details" bgcolor="#e0e0e0"><tr><td>

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<h3>height</h3>

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Height of node, in inches. This is taken as the initial, minimum

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height of the node. If fixedsize is true, this will be the final height

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of the node. Otherwise, if the node label requires more height to fit,

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the node's height will be increased to contain the label. Note also that,

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if the output format is dot, the value given to height will be the final

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value.

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</td></tr></table><table width="100%" class="func-details" bgcolor="#e0e0e0"><tr><td>

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<h3>label</h3>

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Text label attached to objects. If a node's shape is record, then the

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label can have a special format which describes the record layout.

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</td></tr></table><table width="100%" class="func-details" bgcolor="#e0e0e0"><tr><td>

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<h3>layer</h3>

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Specifies layers in which the node or edge is present.

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</td></tr></table><table width="100%" class="func-details" bgcolor="#e0e0e0"><tr><td>

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<h3>margin</h3>

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<p>For graphs, this sets x and y margins of canvas, in inches. If the

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margin is a single double, both margins are set equal to the given

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value.</p>

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For nodes, this attribute specifies space left around the node's

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label. By default, the value is 0.11,0.055.

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</td></tr></table><table width="100%" class="func-details" bgcolor="#e0e0e0"><tr><td>

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<h3>nojustify</h3>

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By default, the justification of multi-line labels is done within the

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largest context that makes sense. Thus, in the label of a polygonal node,

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a left-justified line will align with the left side of the node (shifted

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by the prescribed margin). In record nodes, left-justified line will line

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up with the left side of the enclosing column of fields. If nojustify is

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"true", multi-line labels will be justified in the context of

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itself. For example, if the attribute is set, the first label line is

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long, and the second is shorter and left-justified, the second will align

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with the left-most character in the first line, regardless of how large

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the node might be.

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</td></tr></table><table width="100%" class="func-details" bgcolor="#e0e0e0"><tr><td>

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<h3>orientation</h3>

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Angle, in degrees, used to rotate node shapes.

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</td></tr></table><table width="100%" class="func-details" bgcolor="#e0e0e0"><tr><td>

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<h3>peripheries</h3>

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Set number of peripheries used in polygonal shapes and cluster

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boundaries. Note that user-defined shapes are treated as a form of box

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shape, so the default peripheries value is 1 and the user-defined shape

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will be drawn in a bounding rectangle. Setting peripheries=0 will turn

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this off. Also, 1 is the maximum peripheries value for clusters.

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</td></tr></table><table width="100%" class="func-details" bgcolor="#e0e0e0"><tr><td>

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If true and the node has a pos attribute on input, neato prevents the

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node from moving from the input position. This property can also be

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specified in the pos attribute itself (cf. the point type).

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</td></tr></table><table width="100%" class="func-details" bgcolor="#e0e0e0"><tr><td>

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Position of node, or spline control points, in points. In neato and

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fdp, pos can be used to set initial position of a node. Concerning this,

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see the -s command line flag.

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</td></tr></table><table width="100%" class="func-details" bgcolor="#e0e0e0"><tr><td>

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<h3>rects</h3>

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<p>Rectangles for fields of records, in points.</p>

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description of rect type

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</td></tr></table><table width="100%" class="func-details" bgcolor="#e0e0e0"><tr><td>

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<h3>regular</h3>

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If true, force polygon to be regular.

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</td></tr></table><table width="100%" class="func-details" bgcolor="#e0e0e0"><tr><td>

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This specifies nodes to be used as the center of the layout and the

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root of the generated spanning tree. As a graph attribute, this gives the

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name of the node. As a node attribute (circo only), it specifies that the

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node should be used as a central node. In twopi, this will actually be

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the central node. In circo, the block containing the node will be central

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in the drawing of its connected component. If not defined, twopi will

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pick a most central node, and circo will pick a random node.

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</td></tr></table><table width="100%" class="func-details" bgcolor="#e0e0e0"><tr><td>

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<h3>shape</h3>

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<p>Set the shape of a node.</p>

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Possible values: 'box', 'polygon', 'ellipse', 'circle', 'point',

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'egg', 'triangle', 'plaintext', 'diamond', 'trapezium', 'parallelogram',

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'house', 'pentagon', 'hexagon', 'septagon', 'octagon', 'doublecircle',

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'doubleoctagon', 'tripleoctagon', 'invtriangle', 'invtrapezium',

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'invhouse', 'Mdiamond', 'Msquare', 'Mcircle', 'rect', 'rectangle',

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'none', 'record', 'Mrecord'

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</td></tr></table><table width="100%" class="func-details" bgcolor="#e0e0e0"><tr><td>

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<h3>shapefile</h3>

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<p>If defined, shapefile specifies a file containing user-supplied node

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content. The shape of the node is set to box. The image in the shapefile

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must be rectangular. The image formats supported as well as the precise

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semantics of how the file is used depends on the output format. For

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further details, see External PostScript files.</p>

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<p>There is one exception to this usage. If shape is set to

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"epsf", shapefile gives a filename containing a definition of

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the node in PostScript. The graphics defined must be contain all of the

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node content, including any desired boundaries. For further details,

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see</p>

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External PostScript files.

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</td></tr></table><table width="100%" class="func-details" bgcolor="#e0e0e0"><tr><td>

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<h3>showboxes</h3>

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Print guide boxes in PostScript at the beginning of routesplines if 1,

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or at the end if 2. (Debugging)

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</td></tr></table><table width="100%" class="func-details" bgcolor="#e0e0e0"><tr><td>

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<h3>sides</h3>

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Number of sides if shape=polygon.

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Skew factor for shape=polygon. Positive values skew top of polygon to

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right; negative to left.

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</td></tr></table><table width="100%" class="func-details" bgcolor="#e0e0e0"><tr><td>

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<h3>style</h3>

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Set style for node or edge. For cluster subgraph, if

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"filled", the cluster box's background is filled.

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<h3>target</h3>

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If the object has a URL, this attribute determines which window of the

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browser is used for the URL. See W3C documentation.

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</td></tr></table><table width="100%" class="func-details" bgcolor="#e0e0e0"><tr><td>

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<h3>tooltip</h3>

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Tooltip annotation attached to the node or edge. If unset, Graphviz

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will use the object's label if defined. Note that if the label is a

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record specification or an HTML-like label, the resulting tooltip may be

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unhelpful. In this case, if tooltips will be generated, the user should

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set a tooltip attribute explicitly.

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</td></tr></table><table width="100%" class="func-details" bgcolor="#e0e0e0"><tr><td>

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<p>Hyperlinks incorporated into device-dependent output. At present, used

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in ps2, cmap, i*map and svg formats. For all these formats, URLs can be

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attached to nodes, edges and clusters. URL attributes can also be

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attached to the root graph in ps2, cmap and i*map formats. This serves as

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the base URL for relative URLs in the former, and as the default image

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map file in the latter.</p>

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<p>The active area for a node or cluster is its bounding box. For edges,

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the active areas are small circles where the edge contacts its head and

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tail nodes. These areas may overlap the related node, and the edge URL

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dominates. If the edge has a label, this will also be active. Finally, if

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the edge has a head or tail label, this will also be active. Note,

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however, that if the edge has a headURL attribute, it is this value that

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is used near the head node and on the head label, if defined. The similar

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restriction holds when tailURL is defined.</p>

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The URL of the root graph is only treated as an escString if the

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output format is cmap.

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</td></tr></table><table width="100%" class="func-details" bgcolor="#e0e0e0"><tr><td>

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<h3>vertices</h3>

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If the input graph defines this attribute, the node is polynomial, and

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output is dot or xdot, this attribute provides the coordinates of the

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vertices of the node's polynomial, in inches. If the node is an ellipse

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or circle, the samplepoints attribute affects the output.

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</td></tr></table><table width="100%" class="func-details" bgcolor="#e0e0e0"><tr><td>

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<h3>width</h3>

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Width of node, in inches. This is taken as the initial, minimum width

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of the node. If fixedsize is true, this will be the final width of the

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node. Otherwise, if the node label requires more width to fit, the node's

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width will be increased to contain the label. Note also that, if the

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output format is dot, the value given to width will be the final

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value.

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</td></tr></table><table width="100%" class="func-details" bgcolor="#e0e0e0"><tr><td>

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<p>Provides z coordinate value for 3D layouts and displays. If the graph

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has dim set to 3 (or more), neato will use a node's z value for the z

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coordinate of its initial position if its pos attribute is also

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defined.</p>

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<p>Even if no z values are specified in the input, it is necessary to

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declare a z attribute for nodes, e.g, using node[z=""] in order

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to get z values on output. Thus, setting dim=3 but not declaring z will

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cause neato -Tvrml to layout the graph in 3D but project the layout onto

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the xy-plane for the rendering. If the z attribute is declared, the final

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rendering will be in 3D.</p>

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Attribute Type Descriptions The following list gives the legal strings

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corresponding to values of the given types.

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</td></tr></table><br />

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<th class="navbar">   <a class="navbar" href="trees.html">Trees</a>   </th>

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<th class="navbar">   <a class="navbar" href="indices.html">Index</a>   </th>

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yapgvb

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<tr>

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