1GraphViz(3)           User Contributed Perl Documentation          GraphViz(3)
2
3
4

NAME

6       GraphViz - Interface to AT&T's GraphViz. Deprecated. See GraphViz2
7

SYNOPSIS

9         use GraphViz;
10
11         my $g = GraphViz->new();
12
13         $g->add_node('London');
14         $g->add_node('Paris', label => 'City of\nlurve');
15         $g->add_node('New York');
16
17         $g->add_edge('London' => 'Paris');
18         $g->add_edge('London' => 'New York', label => 'Far');
19         $g->add_edge('Paris' => 'London');
20
21         print $g->as_png;
22

DESCRIPTION

24       This module provides an interface to layout and image generation of
25       directed and undirected graphs in a variety of formats (PostScript,
26       PNG, etc.) using the "dot", "neato", "twopi", "circo" and "fdp"
27       programs from the Graphviz project (http://www.graphviz.org/ or
28       http://www.research.att.com/sw/tools/graphviz/).
29
30       GraphViz is deprecated in favour of GraphViz2.
31

Installation

33       Of course you need to install AT&T's Graphviz before using this module.
34       See <http://www.graphviz.org/Download.php>.
35
36       You are strongly advised to download the stable version of Graphviz,
37       because the development snapshots (click on 'Source code'), are
38       sometimes non-functional.
39
40       Install GraphViz as you would for any "Perl" module:
41
42       Run:
43
44               cpanm GraphViz
45
46               Note: cpanm ships in App::cpanminus. See also App::perlbrew.
47
48       or run:
49
50               sudo cpan GraphViz
51
52       or unpack the distro, and then either:
53
54               perl Build.PL
55               ./Build
56               ./Build test
57               sudo ./Build install
58
59       or:
60
61               perl Makefile.PL
62               make (or dmake or nmake)
63               make test
64               make install
65

Overview

67   Modules in this distro
68       o GraphViz
69       o GraphViz::No
70       o GraphViz::Small
71       o GraphViz::Regex
72       o GraphViz::XML
73       o GraphViz::Data::Grapher
74       o GraphViz::Parse::RecDescent
75       o GraphViz::Parse::Yacc
76       o GraphViz::Parse::Yapp
77
78   What is a graph?
79       A (undirected) graph is a collection of nodes linked together with
80       edges.
81
82       A directed graph is the same as a graph, but the edges have a
83       direction.
84
85   What is GraphViz?
86       This module is an interface to the GraphViz toolset
87       (http://www.graphviz.org/). The GraphViz tools provide automatic graph
88       layout and drawing. This module simplifies the creation of graphs and
89       hides some of the complexity of the GraphViz module.
90
91       Laying out graphs in an aesthetically-pleasing way is a hard problem -
92       there may be multiple ways to lay out the same graph, each with their
93       own quirks. GraphViz luckily takes part of this hard problem and does a
94       pretty good job in a couple of seconds for most graphs.
95
96   Why should I use this module?
97       Observation aids comprehension. That is a fancy way of expressing that
98       popular faux-Chinese proverb: "a picture is worth a thousand words".
99
100       Text is not always the best way to represent anything and everything to
101       do with a computer programs. Pictures and images are easier to
102       assimilate than text. The ability to show a particular thing
103       graphically can aid a great deal in comprehending what that thing
104       really represents.
105
106       Diagrams are computationally efficient, because information can be
107       indexed by location; they group related information in the same area.
108       They also allow relations to be expressed between elements without
109       labeling the elements.
110
111       A friend of mine used this to his advantage when trying to remember
112       important dates in computer history. Instead of sitting down and trying
113       to remember everything, he printed over a hundred posters (each with a
114       date and event) and plastered these throughout his house. His spatial
115       memory is still so good that asked last week (more than a year since
116       the experiment) when Lisp was invented, he replied that it was
117       upstairs, around the corner from the toilet, so must have been around
118       1958.
119
120       Spreadsheets are also a wonderfully simple graphical representation of
121       computational models.
122
123   Applications
124       Bundled with this module are several modules to help graph data
125       structures (GraphViz::Data::Dumper), XML (GraphViz::XML), and
126       Parse::RecDescent, Parse::Yapp, and yacc grammars
127       (GraphViz::Parse::RecDescent, GraphViz::Parse::Yapp, and
128       GraphViz::Parse::Yacc).
129
130       Note that Marcel Grunauer has released some modules on CPAN to graph
131       various other structures. See GraphViz::DBI and GraphViz::ISA for
132       example.
133
134       brian d foy has written an article about Devel::GraphVizProf for Dr.
135       Dobb's Journal:
136       http://www.ddj.com/columns/perl/2001/0104pl002/0104pl002.htm
137
138   Award winning!
139       I presented a paper and talk on "Graphing Perl" using GraphViz at the
140       3rd German Perl Workshop and received the "Best Knowledge Transfer"
141       prize.
142
143           Talk: http://www.astray.com/graphing_perl/graphing_perl.pdf
144         Slides: http://www.astray.com/graphing_perl/
145

METHODS

147   new
148       This is the constructor. It accepts several attributes.
149
150         my $g = GraphViz->new();
151         my $g = GraphViz->new(directed => 0);
152         my $g = GraphViz->new(layout => 'neato', ratio => 'compress');
153         my $g = GraphViz->new(rankdir  => 'BT');
154         my $g = GraphViz->new(width => 8.5, height => 11);
155         my $g = GraphViz->new(width => 30, height => 20,
156                               pagewidth => 8.5, pageheight => 11);
157
158       The most two important attributes are 'layout' and 'directed'.
159
160       layout
161           The 'layout' attribute determines which layout algorithm
162           GraphViz.pm will use. Possible values are:
163
164           dot The default GraphViz layout for directed graph layouts
165
166           neato
167               For undirected graph layouts - spring model
168
169           twopi
170               For undirected graph layouts - radial
171
172           circo
173               For undirected graph layouts - circular
174
175           fdp For undirected graph layouts - force directed spring model
176
177       directed
178           The 'directed' attribute, which defaults to 1 (true) specifies
179           directed (edges have arrows) graphs. Setting this to zero produces
180           undirected graphs (edges do not have arrows).
181
182       rankdir
183           Another attribute 'rankdir' controls the direction in which the
184           nodes are linked together. The default is 'TB' (arrows from top to
185           bottom). Other legal values are 'BT' (bottom->top), 'LR'
186           (left->right) and 'RL' (right->left).
187
188       width, height
189           The 'width' and 'height' attributes control the size of the
190           bounding box of the drawing in inches. This is more useful for
191           PostScript output as for raster graphic (such as PNG) the pixel
192           dimensions can not be set, although there are generally 96 pixels
193           per inch.
194
195       pagewidth, pageheight
196           The 'pagewidth' and 'pageheight' attributes set the PostScript
197           pagination size in inches. That is, if the image is larger than the
198           page then the resulting PostScript image is a sequence of pages
199           that can be tiled or assembled into a mosaic of the full image.
200           (This only works for PostScript output).
201
202       concentrate
203           The 'concentrate' attribute controls enables an edge merging
204           technique to reduce clutter in dense layouts of directed graphs.
205           The default is not to merge edges.
206
207       orientation
208           This option controls the angle, in degrees, used to rotate polygon
209           node shapes.
210
211       random_start
212           For undirected graphs, the 'random_start' attribute requests an
213           initial random placement for the graph, which may give a better
214           result. The default is not random.
215
216       epsilon
217           For undirected graphs, the 'epsilon' attribute decides how long the
218           graph solver tries before finding a graph layout. Lower numbers
219           allow the solver to fun longer and potentially give a better
220           layout. Larger values can decrease the running time but with a
221           reduction in layout quality. The default is 0.1.
222
223       overlap
224           The 'overlap' option allows you to set layout behavior for graph
225           nodes that overlap.  (From GraphViz documentation:)
226
227           Determines if and how node overlaps should be removed.
228
229           true
230               (the default) overlaps are retained.
231
232           scale
233               overlaps are removed by uniformly scaling in x and y.
234
235           false
236               If the value converts to "false", node overlaps are removed by
237               a Voronoi-based technique.
238
239           scalexy
240               x and y are separately scaled to remove overlaps.
241
242           orthoxy, orthxy
243               If the value is "orthoxy" or "orthoyx", overlaps are moved by
244               optimizing two constraint problems, one for the x axis and one
245               for the y. The suffix indicates which axis is processed first.
246
247               NOTE: The methods related to "orthoxy" and "orthoyx" are still
248               evolving. The semantics of these may change, or these methods
249               may disappear altogether.
250
251           compress
252               If the value is "compress", the layout will be scaled down as
253               much as possible without introducing any overlaps.
254
255           Except for the Voronoi method, all of these transforms preserve the
256           orthogonal ordering of the original layout. That is, if the x
257           coordinates of two nodes are originally the same, they will remain
258           the same, and if the x coordinate of one node is originally less
259           than the x coordinate of another, this relation will still hold in
260           the transformed layout. The similar properties hold for the y
261           coordinates.
262
263       no_overlap
264           The 'no_overlap' overlap option, if set, tells the graph solver to
265           not overlap the nodes.  Deprecated,  Use 'overlap' => 'false'.
266
267       ratio
268           The 'ratio' option sets the aspect ratio (drawing height/drawing
269           width) for the drawing. Note that this is adjusted before the size
270           attribute constraints are enforced.  Default value is "fill".
271
272           numeric
273               If ratio is numeric, it is taken as the desired aspect ratio.
274               Then, if the actual aspect ratio is less than the desired
275               ratio, the drawing height is scaled up to achieve the desired
276               ratio; if the actual ratio is greater than that desired ratio,
277               the drawing width is scaled up.
278
279           fill
280               If ratio = "fill" and the size attribute is set, node positions
281               are scaled, separately in both x and y, so that the final
282               drawing exactly fills the specified size.
283
284           compress
285               If ratio = "compress" and the size attribute is set, dot
286               attempts to compress the initial layout to fit in the given
287               size. This achieves a tighter packing of nodes but reduces the
288               balance and symmetry. This feature only works in dot.
289
290           expand
291               If ratio = "expand" the size attribute is set, and both the
292               width and the height of the graph are less than the value in
293               size, node positions are scaled uniformly until at least one
294               dimension fits size exactly. Note that this is distinct from
295               using size as the desired size, as here the drawing is expanded
296               before edges are generated and all node and text sizes remain
297               unchanged.
298
299           auto
300               If ratio = "auto" the page attribute is set and the graph
301               cannot be drawn on a single page, then size is set to an
302               ``ideal'' value. In particular, the size in a given dimension
303               will be the smallest integral multiple of the page size in that
304               dimension which is at least half the current size. The two
305               dimensions are then scaled independently to the new size. This
306               feature only works in dot.
307
308       bgcolor
309           The 'bgcolor' option sets the background colour. A colour value may
310           be "h,s,v" (hue, saturation, brightness) floating point numbers
311           between 0 and 1, or an X11 color name such as 'white', 'black',
312           'red', 'green', 'blue', 'yellow', 'magenta', 'cyan', or
313           'burlywood'.
314
315       name
316           The 'name' option sets name of the graph. This option is useful in
317           few situations, like client side image map generation, see cmapx.
318           By default 'test' is used.
319
320       node,edge,graph
321           The 'node', 'edge' and 'graph' attributes allow you to specify
322           global node, edge and graph attributes (in addition to those
323           controlled by the special attributes described above). The value
324           should be a hash reference containing the corresponding key-value
325           pairs. For example, to make all nodes box-shaped (unless explicitly
326           given another shape):
327
328             my $g = GraphViz->new(node => {shape => 'box'});
329
330   add_node
331       A graph consists of at least one node. All nodes have a name attached
332       which uniquely represents that node.
333
334       The add_node method creates a new node and optionally assigns it
335       attributes.
336
337       The simplest form is used when no attributes are required, in which the
338       string represents the name of the node:
339
340         $g->add_node('Paris');
341
342       Various attributes are possible: "label" provides a label for the node
343       (the label defaults to the name if none is specified). The label can
344       contain embedded newlines with '\n', as well as '\c', '\l', '\r' for
345       center, left, and right justified lines:
346
347         $g->add_node('Paris', label => 'City of\nlurve');
348
349       Attributes need not all be specified in the one line: successive
350       declarations of the same node have a cumulative effect, in that any
351       later attributes are just added to the existing ones. For example, the
352       following two lines are equivalent to the one above:
353
354         $g->add_node('Paris');
355         $g->add_node('Paris', label => 'City of\nlurve');
356
357       Note that multiple attributes can be specified. Other attributes
358       include:
359
360       height, width
361           sets the minimum height or width
362
363       shape
364           sets the node shape. This can be one of: 'record', 'plaintext',
365           'ellipse', 'circle', 'egg', 'triangle', 'box', 'diamond',
366           'trapezium', 'parallelogram', 'house', 'hexagon', 'octagon'
367
368       fontsize
369           sets the label size in points
370
371       fontname
372           sets the label font family name
373
374       color
375           sets the outline colour, and the default fill colour if the 'style'
376           is 'filled' and 'fillcolor' is not specified
377
378           A colour value may be "h,s,v" (hue, saturation, brightness)
379           floating point numbers between 0 and 1, or an X11 color name such
380           as 'white', 'black', 'red', 'green', 'blue', 'yellow', 'magenta',
381           'cyan', or 'burlywood'
382
383       fillcolor
384           sets the fill colour when the style is 'filled'. If not specified,
385           the 'fillcolor' when the 'style' is 'filled' defaults to be the
386           same as the outline color
387
388       style
389           sets the style of the node. Can be one of: 'filled', 'solid',
390           'dashed', 'dotted', 'bold', 'invis'
391
392       URL sets the url for the node in image map and PostScript files. The
393           string '\N' value will be replaced by the node name. In PostScript
394           files, URL information is embedded in such a way that Acrobat
395           Distiller creates PDF files with active hyperlinks
396
397       If you wish to add an anonymous node, that is a node for which you do
398       not wish to generate a name, you may use the following form, where the
399       GraphViz module generates a name and returns it for you. You may then
400       use this name later on to refer to this node:
401
402         my $nodename = $g->add_node('label' => 'Roman city');
403
404       Nodes can be clustered together with the "cluster" attribute, which is
405       drawn by having a labelled rectangle around all the nodes in a cluster.
406       An empty string means not clustered.
407
408         $g->add_node('London', cluster => 'Europe');
409         $g->add_node('Amsterdam', cluster => 'Europe');
410
411       Clusters can also take a hashref so that you can set attributes:
412
413         my $eurocluster = {
414           name      =>'Europe',
415           style     =>'filled',
416           fillcolor =>'lightgray',
417           fontname  =>'arial',
418           fontsize  =>'12',
419         };
420         $g->add_node('London', cluster => $eurocluster, @default_attrs);
421
422       Nodes can be located in the same rank (that is, at the same level in
423       the graph) with the "rank" attribute. Nodes with the same rank value
424       are ranked together.
425
426         $g->add_node('Paris', rank => 'top');
427         $g->add_node('Boston', rank => 'top');
428
429       Also, nodes can consist of multiple parts (known as ports). This is
430       implemented by passing an array reference as the label, and the parts
431       are displayed as a label. GraphViz has a much more complete port
432       system, this is just a simple interface to it. See the 'from_port' and
433       'to_port' attributes of add_edge:
434
435         $g->add_node('London', label => ['Heathrow', 'Gatwick']);
436
437   add_edge
438       Edges are directed (or undirected) links between nodes. This method
439       creates a new edge between two nodes and optionally assigns it
440       attributes.
441
442       The simplest form is when now attributes are required, in which case
443       the nodes from and to which the edge should be are specified. This
444       works well visually in the program code:
445
446         $g->add_edge('London' => 'Paris');
447
448       Attributes such as 'label' can also be used. This specifies a label for
449       the edge.  The label can contain embedded newlines with '\n', as well
450       as '\c', '\l', '\r' for center, left, and right justified lines.
451
452         $g->add_edge('London' => 'New York', label => 'Far');
453
454       Note that multiple attributes can be specified. Other attributes
455       include:
456
457       minlen
458           sets an integer factor that applies to the edge length (ranks for
459           normal edges, or minimum node separation for flat edges)
460
461       weight
462           sets the integer cost of the edge. Values greater than 1 tend to
463           shorten the edge. Weight 0 flat edges are ignored for ordering
464           nodes
465
466       fontsize
467           sets the label type size in points
468
469       fontname
470           sets the label font family name
471
472       fontcolor
473           sets the label text colour
474
475       color
476           sets the line colour for the edge
477
478           A colour value may be "h,s,v" (hue, saturation, brightness)
479           floating point numbers between 0 and 1, or an X11 color name such
480           as 'white', 'black', 'red', 'green', 'blue', 'yellow', 'magenta',
481           'cyan', or 'burlywood'
482
483       style
484           sets the style of the node. Can be one of: 'filled', 'solid',
485           'dashed', 'dotted', 'bold', 'invis'
486
487       dir sets the arrow direction. Can be one of: 'forward', 'back', 'both',
488           'none'
489
490       tailclip, headclip
491           when set to false disables endpoint shape clipping
492
493       arrowhead, arrowtail
494           sets the type for the arrow head or tail. Can be one of: 'none',
495           'normal', 'inv', 'dot', 'odot', 'invdot', 'invodot.'
496
497       arrowsize
498           sets the arrow size: (norm_length=10,norm_width=5,
499           inv_length=6,inv_width=7,dot_radius=2)
500
501       headlabel, taillabel
502           sets the text for port labels. Note that labelfontcolor,
503           labelfontname, labelfontsize are also allowed
504
505       labeldistance, port_label_distance
506           sets the distance from the edge / port to the label. Also
507           labelangle
508
509       decorate
510           if set, draws a line from the edge to the label
511
512       samehead, sametail
513           if set aim edges having the same value to the same port, using the
514           average landing point
515
516       constraint
517           if set to false causes an edge to be ignored for rank assignment
518
519       Additionally, adding edges between ports of a node is done via the
520       'from_port' and 'to_port' parameters, which currently takes in the
521       offset of the port (ie 0, 1, 2...).
522
523         $g->add_edge('London' => 'Paris', from_port => 0);
524
525   as_canon, as_text, as_gif etc. methods
526       There are a number of methods which generate input for dot / neato /
527       twopi / circo / fdp or output the graph in a variety of formats.
528
529       Note that if you pass a filename, the data is written to that filename.
530       If you pass a filehandle, the data will be streamed to the filehandle.
531       If you pass a scalar reference, then the data will be stored in that
532       scalar. If you pass it a code reference, then it is called with the
533       data (note that the coderef may be called multiple times if the image
534       is large). Otherwise, the data is returned:
535
536       Win32 Note: you will probably want to binmode any filehandles you write
537       the output to if you want your application to be portable to Win32.
538
539         my $png_image = $g->as_png;
540         # or
541         $g->as_png("pretty.png"); # save image
542         # or
543         $g->as_png(\*STDOUT); # stream image to a filehandle
544         # or
545         #g->as_png(\$text); # save data in a scalar
546         # or
547         $g->as_png(sub { $png_image .= shift });
548
549       as_debug
550           The as_debug method returns the dot file which we pass to GraphViz.
551           It does not lay out the graph. This is mostly useful for debugging.
552
553             print $g->as_debug;
554
555       as_canon
556           The as_canon method returns the canonical dot / neato / twopi /
557           circo / fdp  file which corresponds to the graph. It does not
558           layout the graph - every other as_* method does.
559
560             print $g->as_canon;
561
562
563             # prints out something like:
564             digraph test {
565                 node [    label = "\N" ];
566                 London [label=London];
567                 Paris [label="City of\nlurve"];
568                 New_York [label="New York"];
569                 London -> Paris;
570                 London -> New_York [label=Far];
571                 Paris -> London;
572             }
573
574       as_text
575           The as_text method returns text which is a layed-out dot / neato /
576           twopi / circo / fdp format file.
577
578             print $g->as_text;
579
580             # prints out something like:
581             digraph test {
582                 node [    label = "\N" ];
583                 graph [bb= "0,0,162,134"];
584                 London [label=London, pos="33,116", width="0.89", height="0.50"];
585                 Paris [label="City of\nlurve", pos="33,23", width="0.92", height="0.62"];
586                 New_York [label="New York", pos="123,23", width="1.08", height="0.50"];
587                 London -> Paris [pos="e,27,45 28,98 26,86 26,70 27,55"];
588                 London -> New_York [label=Far, pos="e,107,40 49,100 63,85 84,63 101,46", lp="99,72"];
589                 Paris -> London [pos="s,38,98 39,92 40,78 40,60 39,45"];
590             }
591
592       as_ps
593           Returns a string which contains a layed-out PostScript-format file.
594
595             print $g->as_ps;
596
597       as_hpgl
598           Returns a string which contains a layed-out HP pen plotter-format
599           file.
600
601             print $g->as_hpgl;
602
603       as_pcl
604           Returns a string which contains a layed-out Laserjet printer-format
605           file.
606
607             print $g->as_pcl;
608
609       as_mif
610           Returns a string which contains a layed-out FrameMaker graphics-
611           format file.
612
613             print $g->as_mif;
614
615       as_pic
616           Returns a string which contains a layed-out PIC-format file.
617
618             print $g->as_pic;
619
620       as_gd
621           Returns a string which contains a layed-out GD-format file.
622
623             print $g->as_gd;
624
625       as_gd2
626           Returns a string which contains a layed-out GD2-format file.
627
628             print $g->as_gd2;
629
630       as_gif
631           Returns a string which contains a layed-out GIF-format file.
632
633             print $g->as_gif;
634
635       as_jpeg
636           Returns a string which contains a layed-out JPEG-format file.
637
638             print $g->as_jpeg;
639
640       as_png
641           Returns a string which contains a layed-out PNG-format file.
642
643             print $g->as_png;
644             $g->as_png("pretty.png"); # save image
645
646       as_wbmp
647           Returns a string which contains a layed-out Windows BMP-format
648           file.
649
650             print $g->as_wbmp;
651
652       as_cmap  (deprecated)
653           Returns a string which contains a layed-out HTML client-side image
654           map format file.   Use as_cmapx instead.
655
656             print $g->as_cmap;
657
658       as_cmapx
659           Returns a string which contains a layed-out HTML HTML/X client-side
660           image map format file. Name and id attributes of map element are
661           set to name of the graph.
662
663             print $g->as_cmapx;
664
665       as_ismap (deprecated)
666           Returns a string which contains a layed-out old-style server-side
667           image map format file.  Use as_imap instead.
668
669             print $g->as_ismap;
670
671       as_imap
672           Returns a string which contains a layed-out HTML new-style server-
673           side image map format file.
674
675             print $g->as_imap;
676
677       as_vdx
678           Returns a string which contains a VDX-format (Microsoft Visio)
679           file.
680
681             print $g->as_vdx;
682
683       as_vrml
684           Returns a string which contains a layed-out VRML-format file.
685
686             print $g->as_vrml;
687
688       as_vtx
689           Returns a string which contains a layed-out VTX (Visual Thought)
690           format file.
691
692             print $g->as_vtx;
693
694       as_mp
695           Returns a string which contains a layed-out MetaPost-format file.
696
697             print $g->as_mp;
698
699       as_fig
700           Returns a string which contains a layed-out FIG-format file.
701
702             print $g->as_fig;
703
704       as_svg
705           Returns a string which contains a layed-out SVG-format file.
706
707             print $g->as_svg;
708
709       as_svgz
710           Returns a string which contains a layed-out SVG-format file that is
711           compressed.
712
713             print $g->as_svgz;
714
715       as_plain
716           Returns a string which contains a layed-out simple-format file.
717
718             print $g->as_plain;
719

FAQ

721   Why do I get error messages like the following?
722               Error: <stdin>:1: syntax error near line 1
723               context: digraph >>>  Graph <<<  {
724
725       Graphviz reserves some words as keywords, meaning they can't be used as
726       an ID, e.g. for the name of the graph.  So, don't do this:
727
728               strict graph graph{...}
729               strict graph Graph{...}
730               strict graph strict{...}
731               etc...
732
733       Likewise for non-strict graphs, and digraphs. You can however add
734       double-quotes around such reserved words:
735
736               strict graph "graph"{...}
737
738       Even better, use a more meaningful name for your graph...
739
740       The keywords are: node, edge, graph, digraph, subgraph and strict.
741       Compass points are not keywords.
742
743       See keywords <http://www.graphviz.org/content/dot-language> in the
744       discussion of the syntax of DOT for details.
745
746   How do you handle XXE within XML?
747       Due to security risks with XXE in XML, Graphviz does not support XML
748       that contains XXE. Thus it automatically prevents external entities
749       being parsed by using the no_xxe option in XML::Twig when calling
750       XML::Twig -> new(). And for this reason also the pre-reqs in
751       Makefile.PL specify XML::Twig V 3.52.
752
753       See
754       <https://metacpan.org/pod/release/MIROD/XML-Twig-3.52/Twig.pm#no_xxe>
755

NOTES

757       Older versions of GraphViz used a slightly different syntax for node
758       and edge adding (with hash references). The new format is slightly
759       clearer, although for the moment we support both. Use the new, clear
760       syntax, please.
761

SEE ALSO

763       GraphViz is deprecated in favour of GraphViz2.
764

Machine-Readable Change Log

766       The file Changes was converted into Changelog.ini by
767       Module::Metadata::Changes.
768

Repository

770       <https://github.com/ronsavage/GraphViz>
771

AUTHOR

773       Leon Brocard: <acme@astray.com>.
774
775       Current maintainer: Ron Savage <ron@savage.net.au>.
776
777       My homepage: <http://savage.net.au/>.
778
780       Copyright (C) 2000-4, Leon Brocard
781

LICENSE

783       This module is free software; you can redistribute it or modify it
784       under the Perl License, a copy of which is available at
785       <http://dev.perl.org/licenses/>.
786
787
788
789perl v5.34.0                      2021-07-22                       GraphViz(3)
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