<HR ALIGN=CENTER WIDTH="70%" SIZE=3>
<TABLE ALIGN=CENTER>
<TR><TH>Name</TH><TH><A HREF=#h:uses>Used By</A></TH><TH>Type</TH><TH>Default</TH><TH>Minimum</TH><TH>Notes</TH></TR>
+ <TR><TD><A NAME=a:Damping HREF=#d:Damping>Damping</A>
+</TD><TD>G</TD><TD>double</TD><TD ALIGN="CENTER">0.99</TD><TD>0.0</TD><TD>neato only</TD> </TR>
+ <TR><TD><A NAME=a:K HREF=#d:K>K</A>
+</TD><TD>GC</TD><TD>double</TD><TD ALIGN="CENTER">0.3</TD><TD>0</TD><TD>sfdp, fdp only</TD> </TR>
+ <TR><TD><A NAME=a:URL HREF=#d:URL>URL</A>
+</TD><TD>ENGC</TD><TD><A HREF=#k:lblString>lblString</A>
+</TD><TD ALIGN="CENTER"><none></TD><TD></TD><TD>svg, postscript, map only</TD> </TR>
<TR><TD><A NAME=a:arrowhead HREF=#d:arrowhead>arrowhead</A>
</TD><TD>E</TD><TD><A HREF=#k:arrowType>arrowType</A>
</TD><TD ALIGN="CENTER">normal</TD><TD></TD><TD></TD> </TR>
</TD><TD ALIGN="CENTER">normal</TD><TD></TD><TD></TD> </TR>
<TR><TD><A NAME=a:aspect HREF=#d:aspect>aspect</A>
</TD><TD>G</TD><TD><A HREF=#k:aspectType>aspectType</A>
-</TD><TD ALIGN="CENTER">1.0,1</TD><TD></TD><TD>dot only</TD> </TR>
+</TD><TD ALIGN="CENTER"></TD><TD></TD><TD>dot only</TD> </TR>
<TR><TD><A NAME=a:bb HREF=#d:bb>bb</A>
</TD><TD>G</TD><TD><A HREF=#k:rect>rect</A>
</TD><TD ALIGN="CENTER"></TD><TD></TD><TD>write only</TD> </TR>
<TR><TD><A NAME=a:constraint HREF=#d:constraint>constraint</A>
</TD><TD>E</TD><TD><A HREF=#k:bool>bool</A>
</TD><TD ALIGN="CENTER">true</TD><TD></TD><TD>dot only</TD> </TR>
- <TR><TD><A NAME=a:Damping HREF=#d:Damping>Damping</A>
-</TD><TD>G</TD><TD>double</TD><TD ALIGN="CENTER">0.99</TD><TD>0.0</TD><TD>neato only</TD> </TR>
<TR><TD><A NAME=a:decorate HREF=#d:decorate>decorate</A>
</TD><TD>E</TD><TD><A HREF=#k:bool>bool</A>
</TD><TD ALIGN="CENTER">false</TD><TD></TD><TD></TD> </TR>
</TD><TD>N</TD><TD>double</TD><TD ALIGN="CENTER">0.0</TD><TD>-100.0</TD><TD></TD> </TR>
<TR><TD><A NAME=a:dpi HREF=#d:dpi>dpi</A>
</TD><TD>G</TD><TD>double</TD><TD ALIGN="CENTER">96.0<BR>0.0</TD><TD></TD><TD>svg, bitmap output only</TD> </TR>
+ <TR><TD><A NAME=a:edgeURL HREF=#d:edgeURL>edgeURL</A>
+</TD><TD>E</TD><TD><A HREF=#k:lblString>lblString</A>
+</TD><TD ALIGN="CENTER">""</TD><TD></TD><TD>svg, map only</TD> </TR>
<TR><TD><A NAME=a:edgehref HREF=#d:edgehref>edgehref</A>
</TD><TD>E</TD><TD><A HREF=#k:lblString>lblString</A>
</TD><TD ALIGN="CENTER">""</TD><TD></TD><TD>svg, map only</TD> </TR>
<TR><TD><A NAME=a:edgetooltip HREF=#d:edgetooltip>edgetooltip</A>
</TD><TD>E</TD><TD><A HREF=#k:escString>escString</A>
</TD><TD ALIGN="CENTER">""</TD><TD></TD><TD>svg, cmap only</TD> </TR>
- <TR><TD><A NAME=a:edgeURL HREF=#d:edgeURL>edgeURL</A>
-</TD><TD>E</TD><TD><A HREF=#k:lblString>lblString</A>
-</TD><TD ALIGN="CENTER">""</TD><TD></TD><TD>svg, map only</TD> </TR>
<TR><TD><A NAME=a:epsilon HREF=#d:epsilon>epsilon</A>
</TD><TD>G</TD><TD>double</TD><TD ALIGN="CENTER">.0001 * # nodes(mode == KK)<BR>.0001(mode == major)</TD><TD></TD><TD>neato only</TD> </TR>
<TR><TD><A NAME=a:esep HREF=#d:esep>esep</A>
</TD><TD>ENGC</TD><TD>double</TD><TD ALIGN="CENTER">14.0</TD><TD>1.0</TD><TD></TD> </TR>
<TR><TD><A NAME=a:group HREF=#d:group>group</A>
</TD><TD>N</TD><TD>string</TD><TD ALIGN="CENTER">""</TD><TD></TD><TD>dot only</TD> </TR>
+ <TR><TD><A NAME=a:headURL HREF=#d:headURL>headURL</A>
+</TD><TD>E</TD><TD><A HREF=#k:lblString>lblString</A>
+</TD><TD ALIGN="CENTER">""</TD><TD></TD><TD>svg, map only</TD> </TR>
<TR><TD><A NAME=a:headclip HREF=#d:headclip>headclip</A>
</TD><TD>E</TD><TD><A HREF=#k:bool>bool</A>
</TD><TD ALIGN="CENTER">true</TD><TD></TD><TD></TD> </TR>
<TR><TD><A NAME=a:headtooltip HREF=#d:headtooltip>headtooltip</A>
</TD><TD>E</TD><TD><A HREF=#k:escString>escString</A>
</TD><TD ALIGN="CENTER">""</TD><TD></TD><TD>svg, cmap only</TD> </TR>
- <TR><TD><A NAME=a:headURL HREF=#d:headURL>headURL</A>
-</TD><TD>E</TD><TD><A HREF=#k:lblString>lblString</A>
-</TD><TD ALIGN="CENTER">""</TD><TD></TD><TD>svg, map only</TD> </TR>
<TR><TD><A NAME=a:height HREF=#d:height>height</A>
</TD><TD>N</TD><TD>double</TD><TD ALIGN="CENTER">0.5</TD><TD>0.02</TD><TD></TD> </TR>
<TR><TD><A NAME=a:href HREF=#d:href>href</A>
<TR><TD><A NAME=a:imagescale HREF=#d:imagescale>imagescale</A>
</TD><TD>N</TD><TD><A HREF=#k:bool>bool</A>
<BR>string</TD><TD ALIGN="CENTER">false</TD><TD></TD><TD></TD> </TR>
- <TR><TD><A NAME=a:K HREF=#d:K>K</A>
-</TD><TD>GC</TD><TD>double</TD><TD ALIGN="CENTER">0.3</TD><TD>0</TD><TD>sfdp, fdp only</TD> </TR>
<TR><TD><A NAME=a:label HREF=#d:label>label</A>
</TD><TD>ENGC</TD><TD><A HREF=#k:lblString>lblString</A>
</TD><TD ALIGN="CENTER">"\N" (nodes)<BR>"" (otherwise)</TD><TD></TD><TD></TD> </TR>
+ <TR><TD><A NAME=a:labelURL HREF=#d:labelURL>labelURL</A>
+</TD><TD>E</TD><TD><A HREF=#k:lblString>lblString</A>
+</TD><TD ALIGN="CENTER">""</TD><TD></TD><TD>svg, map only</TD> </TR>
<TR><TD><A NAME=a:labelangle HREF=#d:labelangle>labelangle</A>
</TD><TD>E</TD><TD>double</TD><TD ALIGN="CENTER">-25.0</TD><TD>-180.0</TD><TD></TD> </TR>
<TR><TD><A NAME=a:labeldistance HREF=#d:labeldistance>labeldistance</A>
<TR><TD><A NAME=a:labeltooltip HREF=#d:labeltooltip>labeltooltip</A>
</TD><TD>E</TD><TD><A HREF=#k:escString>escString</A>
</TD><TD ALIGN="CENTER">""</TD><TD></TD><TD>svg, cmap only</TD> </TR>
- <TR><TD><A NAME=a:labelURL HREF=#d:labelURL>labelURL</A>
-</TD><TD>E</TD><TD><A HREF=#k:lblString>lblString</A>
-</TD><TD ALIGN="CENTER">""</TD><TD></TD><TD>svg, map only</TD> </TR>
<TR><TD><A NAME=a:landscape HREF=#d:landscape>landscape</A>
</TD><TD>G</TD><TD><A HREF=#k:bool>bool</A>
</TD><TD ALIGN="CENTER">false</TD><TD></TD><TD></TD> </TR>
</TD><TD ALIGN="CENTER"></TD><TD></TD><TD></TD> </TR>
<TR><TD><A NAME=a:stylesheet HREF=#d:stylesheet>stylesheet</A>
</TD><TD>G</TD><TD>string</TD><TD ALIGN="CENTER">""</TD><TD></TD><TD>svg only</TD> </TR>
+ <TR><TD><A NAME=a:tailURL HREF=#d:tailURL>tailURL</A>
+</TD><TD>E</TD><TD><A HREF=#k:lblString>lblString</A>
+</TD><TD ALIGN="CENTER">""</TD><TD></TD><TD>svg, map only</TD> </TR>
<TR><TD><A NAME=a:tailclip HREF=#d:tailclip>tailclip</A>
</TD><TD>E</TD><TD><A HREF=#k:bool>bool</A>
</TD><TD ALIGN="CENTER">true</TD><TD></TD><TD></TD> </TR>
<TR><TD><A NAME=a:tailtooltip HREF=#d:tailtooltip>tailtooltip</A>
</TD><TD>E</TD><TD><A HREF=#k:escString>escString</A>
</TD><TD ALIGN="CENTER">""</TD><TD></TD><TD>svg, cmap only</TD> </TR>
- <TR><TD><A NAME=a:tailURL HREF=#d:tailURL>tailURL</A>
-</TD><TD>E</TD><TD><A HREF=#k:lblString>lblString</A>
-</TD><TD ALIGN="CENTER">""</TD><TD></TD><TD>svg, map only</TD> </TR>
<TR><TD><A NAME=a:target HREF=#d:target>target</A>
</TD><TD>ENGC</TD><TD><A HREF=#k:escString>escString</A>
<BR>string</TD><TD ALIGN="CENTER"><none></TD><TD></TD><TD>svg, map only</TD> </TR>
<TR><TD><A NAME=a:truecolor HREF=#d:truecolor>truecolor</A>
</TD><TD>G</TD><TD><A HREF=#k:bool>bool</A>
</TD><TD ALIGN="CENTER"></TD><TD></TD><TD>bitmap output only</TD> </TR>
- <TR><TD><A NAME=a:URL HREF=#d:URL>URL</A>
-</TD><TD>ENGC</TD><TD><A HREF=#k:lblString>lblString</A>
-</TD><TD ALIGN="CENTER"><none></TD><TD></TD><TD>svg, postscript, map only</TD> </TR>
<TR><TD><A NAME=a:vertices HREF=#d:vertices>vertices</A>
</TD><TD>N</TD><TD><A HREF=#k:pointfList>pointfList</A>
</TD><TD ALIGN="CENTER"></TD><TD></TD><TD>write only</TD> </TR>
<HR>
<H1>Attribute Descriptions</H1>
<DL>
+<DT><A NAME=d:Damping HREF=#a:Damping><STRONG>Damping</STRONG></A>
+<DD> Factor damping force motions. On each iteration, a nodes movement
+ is limited to this factor of its potential motion. By being less than
+ 1.0, the system tends to ``cool'', thereby preventing cycling.
+
+<DT><A NAME=d:K HREF=#a:K><STRONG>K</STRONG></A>
+<DD> Spring constant used in virtual physical model. It roughly corresponds
+ to an ideal edge length (in inches), in that increasing K tends to
+ increase the distance between nodes.
+ Note that the edge attribute <A HREF=#d:len>len</A> can be used to
+ override this value for adjacent nodes.
+
+<DT><A NAME=d:URL HREF=#a:URL><STRONG>URL</STRONG></A>
+<DD> Hyperlinks incorporated into device-dependent output.
+ At present, used in ps2, cmap, i*map and svg formats.
+ For all these formats, URLs can be attached to nodes, edges and
+ clusters. URL attributes can also be attached to the root graph in ps2,
+ cmap and i*map formats. This serves as the base URL for relative URLs in the
+ former, and as the default image map file in the latter.
+ <P>
+ For svg, cmapx and imap output, the active area for a node is its
+ visible image.
+ For example, an unfilled
+ node with no drawn boundary will only be active on its label.
+ For other output, the active area is its bounding box.
+ The active area for a cluster is its bounding box.
+ For edges, the active areas are small circles where the edge contacts its head
+ and tail nodes. In addition, for svg, cmapx and imap, the active area
+ includes a thin polygon approximating the edge. The circles may
+ overlap the related node, and the edge URL dominates.
+ If the edge has a label, this will also be active.
+ Finally, if the edge has a head or tail label, this will also be active.
+ <P>
+ Note that, for edges, the attributes <A HREF=#d:headURL>headURL</A>,
+ <A HREF=#d:tailURL>tailURL</A>, <A HREF=#d:labelURL>labelURL</A> and
+ <A HREF=#d:edgeURL>edgeURL</A> allow control of various parts of an
+ edge.
+ Also note that, if active areas of two edges overlap, it is unspecified
+ which area dominates.
+
<DT><A NAME=d:arrowhead HREF=#a:arrowhead><STRONG>arrowhead</STRONG></A>
<DD> Style of arrowhead on the head node of an edge.
See also the <A HREF=#d:dir>dir</A> attribute,
and a <A HREF=#h:undir_note>limitation</A>.
<DT><A NAME=d:aspect HREF=#a:aspect><STRONG>aspect</STRONG></A>
-<DD> Target aspect ratio of the renderered graph, and optionally the maximum number of iterations allowed to achieve it.
+<DD> Target aspect ratio (width of the layout divided by the height)
+ of the graph drawing. If unset, dot minimizes the total edge length.
+ For certain graphs, like those with large fan-in or fan-out, this can
+ lead to very wide layouts. Setting <TT>aspect</TT> will cause dot to try
+ to adjust the layout to get an aspect ratio close to that specified
+ by <TT>aspect</TT>.
+ <P>
+ By default, dot will do 5 passes attempting to achieve the desired
+ aspect ratio. For certain graphs, more passes will be needed to get
+ close enough. The <TT>aspect</TT> attribute can also be used to
+ specify the maximum number of passes to try.
+ <P>
+ At present, there is no mechanism for widening a very tall layout.
+ Also, the algorithm doesn't handle clusters, nor disconnected graphs.
+ For the latter case, one can split the pipeline<BR>
+ <TT>ccomps -x | dot | gvpack | neato -n2</TT>
+ to get a similar effect.
<DT><A NAME=d:bb HREF=#a:bb><STRONG>bb</STRONG></A>
<DD> Bounding box of drawing in integer points.
yielding the graph:<BR>
<IMG SRC="constraint.gif">
-<DT><A NAME=d:Damping HREF=#a:Damping><STRONG>Damping</STRONG></A>
-<DD> Factor damping force motions. On each iteration, a nodes movement
- is limited to this factor of its potential motion. By being less than
- 1.0, the system tends to ``cool'', thereby preventing cycling.
-
<DT><A NAME=d:decorate HREF=#a:decorate><STRONG>decorate</STRONG></A>
<DD> If true, attach edge label to edge by a 2-segment
polyline, underlining the label, then going to the closest point of spline.
it is used to guarantee that the dimensions in the output correspond to
the correct number of points or inches.
+<DT><A NAME=d:edgeURL HREF=#a:edgeURL><STRONG>edgeURL</STRONG></A>
+<DD> If <B>edgeURL</B> is defined, this is the link used for the non-label
+ parts of an edge. This value overrides any <A HREF=#d:URL>URL</A>
+ defined for the edge.
+ Also, this value is used near the head or tail node unless overridden
+ by a <A HREF=#d:headURL>headURL</A> or <A HREF=#d:tailURL>tailURL</A> value,
+ respectively.
+ See <A HREF=#h:undir_note>limitation</A>.
+
<DT><A NAME=d:edgehref HREF=#a:edgehref><STRONG>edgehref</STRONG></A>
<DD> Synonym for <A HREF=#d:edgeURL>edgeURL</A>.
This is used only if the edge has a <A HREF=#d:URL>URL</A>
or <A HREF=#d:edgeURL>edgeURL</A> attribute.
-<DT><A NAME=d:edgeURL HREF=#a:edgeURL><STRONG>edgeURL</STRONG></A>
-<DD> If <B>edgeURL</B> is defined, this is the link used for the non-label
- parts of an edge. This value overrides any <A HREF=#d:URL>URL</A>
- defined for the edge.
- Also, this value is used near the head or tail node unless overridden
- by a <A HREF=#d:headURL>headURL</A> or <A HREF=#d:tailURL>tailURL</A> value,
- respectively.
- See <A HREF=#h:undir_note>limitation</A>.
-
<DT><A NAME=d:epsilon HREF=#a:epsilon><STRONG>epsilon</STRONG></A>
<DD> Terminating condition. If the length squared of all energy gradients are
< <B>epsilon</B>, the algorithm stops.
same group attribute, parameters are set to avoid crossings and keep
the edges straight.
+<DT><A NAME=d:headURL HREF=#a:headURL><STRONG>headURL</STRONG></A>
+<DD> If <B>headURL</B> is defined, it is
+ output as part of the head label of the edge.
+ Also, this value is used near the head node, overriding any
+ <A HREF=#d:URL>URL</A> value.
+ See <A HREF=#h:undir_note>limitation</A>.
+
<DT><A NAME=d:headclip HREF=#a:headclip><STRONG>headclip</STRONG></A>
<DD> If true, the head of an edge is clipped to the boundary of the head node;
otherwise, the end of the edge goes to the center of the node, or the
<DD> Tooltip annotation attached to the head of an edge. This is used only
if the edge has a <A HREF=#d:headURL>headURL</A> attribute.
-<DT><A NAME=d:headURL HREF=#a:headURL><STRONG>headURL</STRONG></A>
-<DD> If <B>headURL</B> is defined, it is
- output as part of the head label of the edge.
- Also, this value is used near the head node, overriding any
- <A HREF=#d:URL>URL</A> value.
- See <A HREF=#h:undir_note>limitation</A>.
-
<DT><A NAME=d:height HREF=#a:height><STRONG>height</STRONG></A>
<DD> Height of node, in inches. This is taken as the initial, minimum height
of the node. If <A HREF=#d:fixedsize><B>fixedsize</B></A> is true, this
expansion, if <TT>imagescale=true</TT>, width and height are
scaled uniformly.
-<DT><A NAME=d:K HREF=#a:K><STRONG>K</STRONG></A>
-<DD> Spring constant used in virtual physical model. It roughly corresponds
- to an ideal edge length (in inches), in that increasing K tends to
- increase the distance between nodes.
- Note that the edge attribute <A HREF=#d:len>len</A> can be used to
- override this value for adjacent nodes.
-
<DT><A NAME=d:label HREF=#a:label><STRONG>label</STRONG></A>
<DD> Text label attached to objects.
If a node's <A HREF=#d:shape>shape</A> is record, then the label can
have a <A HREF=shapes.html#record>special format</A>
which describes the record layout.
+<DT><A NAME=d:labelURL HREF=#a:labelURL><STRONG>labelURL</STRONG></A>
+<DD> If <B>labelURL</B> is defined, this is the link used for the label
+ of an edge. This value overrides any <A HREF=#d:URL>URL</A>
+ defined for the edge.
+
<DT><A NAME=d:labelangle HREF=#a:labelangle><STRONG>labelangle</STRONG></A>
<DD> This, along with <A HREF=#d:labeldistance>labeldistance</A>, determine
where the
This is used only if the edge has a <A HREF=#d:URL>URL</A>
or <A HREF=#d:labelURL>labelURL</A> attribute.
-<DT><A NAME=d:labelURL HREF=#a:labelURL><STRONG>labelURL</STRONG></A>
-<DD> If <B>labelURL</B> is defined, this is the link used for the label
- of an edge. This value overrides any <A HREF=#d:URL>URL</A>
- defined for the edge.
-
<DT><A NAME=d:landscape HREF=#a:landscape><STRONG>landscape</STRONG></A>
<DD> If true, the graph is rendered in landscape mode. Synonymous with
<A HREF=#d:rotate><TT>rotate=90</TT></A> or
Voronoi-based technique.
If the value is "scalexy", x and y are separately
scaled to remove overlaps.
+ If sfdp is available, one can set overlap=prism to use a proximity graph-
+ based algorithm for overlap removal. This last is the preferred technique,
+ though scale and false can work well with small graphs.
+ <P>
+ If the value is "compress", the layout will be scaled down as much as
+ possible without introducing any overlaps, obviously assuming there are
+ none to begin with.
+ <P>
+ <B>N.B.</B>The remaining allowed values of <TT>overlap</TT>
+ correspond to algorithms which, at present, can produce bad aspect ratios.
+ In addition, we deprecate the use of the "ortho*" and "portho*".
+ <P>
+ If the value is "vpsc", overlap removal is done as a
+ quadratic optimization to minimize node displacement while removing
+ node overlaps.
+ <P>
If the value is "orthoxy" or "orthoyx", overlaps
are moved by optimizing two constraint problems, one for the x axis and
one for the y. The suffix indicates which axis is processed first.
to the previous four, except only pseudo-orthogonal ordering is
enforced.
<P>
- If the value is "compress", the layout will be scaled down as much as
- possible without introducing any overlaps, obviously assuming there are
- none to begin with.
- <P>
- If the value is "vpsc", overlap removal is similarly to "ortho", except
- quadratic optimization is used to minimize node displacement.
- <P>
If the layout is done by neato with <A HREF=#d:mode>mode</A>="ipsep",
then one can use <TT>overlap=ipsep</TT>.
In this case, the overlap removal constraints are
incorporated into the layout algorithm itself.
N.B. At present, this only supports one level of clustering.
<P>
- Except for fdp, the layouts assume <TT>overlap="true"</TT> as the default.
+ Except for fdp and sfdp, the layouts assume <TT>overlap="true"</TT> as the default.
Fdp first uses a number of passes using built-in, force-directed technique
to remove overlaps. Thus, fdp accepts <B>overlap</B> with an integer
prefix followed by a colon, specifying the number of tries. If there is
<TT>overlap="0:true"</TT> and <TT>overlap="0:"</TT> all turn off all overlap
removal.
<P>
- Except for the Voronoi method, all of these transforms preserve the
+ By default, sfdp uses <TT>overlap="prism"</TT>. This is preceded by a
+ small scaling up, controlled by the
+ <A HREF="#d:overlap_scaling"><TT>overlap_scaling</TT></A> attribute,
+ which can remove a significant portion of the overlap.
+ <P>
+ Except for the Voronoi and prism methods, all of these transforms preserve the
orthogonal ordering of the original layout. That is, if the x coordinates
of two nodes are originally the same, they will remain the same, and if
the x coordinate of one node is originally less than the x coordinate of
similar properties hold for the y coordinates.
This is not quite true for the "porth*" cases. For these, orthogonal
ordering is only preserved among nodes related by an edge.
- <P>
- <B>NOTE: </B>The methods "orthoxy" and "orthoyx" are still evolving. The
- semantics of these may change, or these methods may disappear altogether.
<DT><A NAME=d:overlap_scaling HREF=#a:overlap_scaling><STRONG>overlap_scaling</STRONG></A>
<DD> When <TT>overlap=sfdp</TT>, the layout is scaled by this factor, thereby
<DT><A NAME=d:stylesheet HREF=#a:stylesheet><STRONG>stylesheet</STRONG></A>
<DD> A URL or pathname specifying an XML style sheet, used in SVG output.
+<DT><A NAME=d:tailURL HREF=#a:tailURL><STRONG>tailURL</STRONG></A>
+<DD> If <B>tailURL</B> is defined, it is
+ output as part of the tail label of the edge.
+ Also, this value is used near the tail node, overriding any
+ <A HREF=#d:URL>URL</A> value.
+ See <A HREF=#h:undir_note>limitation</A>.
+
<DT><A NAME=d:tailclip HREF=#a:tailclip><STRONG>tailclip</STRONG></A>
<DD> If true, the tail of an edge is clipped to the boundary of the tail node;
otherwise, the end of the edge goes to the center of the node, or the
<DD> Tooltip annotation attached to the tail of an edge. This is used only
if the edge has a <A HREF=#d:tailURL>tailURL</A> attribute.
-<DT><A NAME=d:tailURL HREF=#a:tailURL><STRONG>tailURL</STRONG></A>
-<DD> If <B>tailURL</B> is defined, it is
- output as part of the tail label of the edge.
- Also, this value is used near the tail node, overriding any
- <A HREF=#d:URL>URL</A> value.
- See <A HREF=#h:undir_note>limitation</A>.
-
<DT><A NAME=d:target HREF=#a:target><STRONG>target</STRONG></A>
<DD> If the object has a URL, this attribute determines which window
of the browser is used for the URL.
antialiasing can show up as a fuzzy white area around characters.
Using <B>truecolor</B>=true avoids this problem.
-<DT><A NAME=d:URL HREF=#a:URL><STRONG>URL</STRONG></A>
-<DD> Hyperlinks incorporated into device-dependent output.
- At present, used in ps2, cmap, i*map and svg formats.
- For all these formats, URLs can be attached to nodes, edges and
- clusters. URL attributes can also be attached to the root graph in ps2,
- cmap and i*map formats. This serves as the base URL for relative URLs in the
- former, and as the default image map file in the latter.
- <P>
- For svg, cmapx and imap output, the active area for a node is its
- visible image.
- For example, an unfilled
- node with no drawn boundary will only be active on its label.
- For other output, the active area is its bounding box.
- The active area for a cluster is its bounding box.
- For edges, the active areas are small circles where the edge contacts its head
- and tail nodes. In addition, for svg, cmapx and imap, the active area
- includes a thin polygon approximating the edge. The circles may
- overlap the related node, and the edge URL dominates.
- If the edge has a label, this will also be active.
- Finally, if the edge has a head or tail label, this will also be active.
- <P>
- Note that, for edges, the attributes <A HREF=#d:headURL>headURL</A>,
- <A HREF=#d:tailURL>tailURL</A>, <A HREF=#d:labelURL>labelURL</A> and
- <A HREF=#d:edgeURL>edgeURL</A> allow control of various parts of an
- edge.
- Also note that, if active areas of two edges overlap, it is unspecified
- which area dominates.
-
<DT><A NAME=d:vertices HREF=#a:vertices><STRONG>vertices</STRONG></A>
<DD> If the input graph defines this attribute, the node is polygonal,
and output is dot or xdot, this attribute provides the
<TT>empty</TT>, <TT>invempty</TT>).
<DT><A NAME=k:aspectType><STRONG>aspectType</STRONG></A>
-<DD><p>An aspect ratio, double, followed optionally by a ',' and a max iteration count.
- If the aspect ratio is given, but no max iteration count, then the max iteration count defaults to 5.
+<DD><p>An aspect ratio, double, followed optionally by a ',' and a maximum pass
+ count. If the aspect ratio is given, but no maximum pass count, the
+ latter defaults to 5.
<DT><A NAME=k:clusterMode><STRONG>clusterMode</STRONG></A>
<DD>"local","global","none"
Using "fast" gives about a 2-4 times overall speedup compared with "normal",
though layout quality can suffer a little.
+<DT><A NAME=k:rankType><STRONG>rankType</STRONG></A>
+<DD>"same", "min", "source", "max", "sink"
+
<DT><A NAME=k:rankdir><STRONG>rankdir</STRONG></A>
<DD>"TB", "LR", "BT", "RL", corresponding to directed graphs drawn
from top to bottom, from left to right, from bottom to top, and from
right to left, respectively.
-<DT><A NAME=k:rankType><STRONG>rankType</STRONG></A>
-<DD>"same", "min", "source", "max", "sink"
-
<DT><A NAME=k:rect><STRONG>rect</STRONG></A>
<DD>"%d,%d,%d,%d" The rect llx,lly,urx,ury gives the coordinates, in
points, of the lower-left corner (llx,lly) and the upper-right corner
projects / graphviz / commitdiff