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gvmap(1)                                                              gvmap(1)




NAME

       gvmap  - find clusters and create a geographical map highlighting clus-
       ters.


SYNOPSIS

       gvmap [ options ] [ -o outfile ] [ files ]


DESCRIPTION

       gvmap takes as input a graph in DOT format,  finds  node  clusters  and
       produces a rendering of the graph as a geographic-style map, with clus-
       ters highlighted as countries, in xdot format.

       In the input graph, each node must  have  position,  width  and  height
       information  (pos,  width and height attributes, respectively) defined,
       and nodes must not overlap.

       By default, gvmap will generate the clusters from the data. If desired,
       the  input graph can specify cluster information by giving every node a
       cluster attribute whose value is a small positive integer. (It is works
       best  if cluster values are all integers in the interval [1,K] for some
       K. Nodes sharing the same cluster attribute value will be put into  the
       same cluster. N.B. For the cluster attribute to be used, all nodes must
       have a valid value.

       If the -D flag is used, gvmap will use the top-level cluster  subgraphs
       to  determine  the  clustering. Any nodes not in such a cluster will be
       put into a single catch-all cluster.

       If the input specifies the desired clustering as  described  above,  it
       can also specify a desired coloring by having some node in each cluster
       provide a clustercolor attribute. N.B. Unless one specifies  -c0,  only
       the  clustercolor of the last node in a cluster has an effect. In addi-
       tion, unless one uses -O, gvmap may permute the given colors.


OPTIONS

       The following options are supported:

       -a k   The integer k specifies the average number of artificial  points
              added  along  the  bounding  box  of the labels. Such artificial
              points are added to avoid a country boundary cutting through the
              boundary box of the labels. Computing time is proportional to k;
              hence, for large graphs, a small value of k is suggested. If k =
              -1, a suitable value of k is automatically selected based on the
              graph size. By default k = -1.

       -b v   The real number v specifies the line  width  used  to  draw  the
              polygon boundaries, with v < 0 for no line. By default v = 0.

       -c k   The  integer  k  specifies  color scheme used to color the coun-
              tries. By default k = 1.

          Acceptable values are:
                 0 : no polygons
                 1 : pastel
                 2 : blue to yellow
                 3 : white to red
                 4 : light grey to red
                 5 : primary colors
                 6 : sequential single hue red
                 7 : sequential single hue lighter red
                 8 : light grey

       -c_opacity=xy
              Specifies a  two-character  hexadecimal  string  specifying  the
              opacity of the polygons.

       -C d   The  integer  d  specifies the maximum number of clusters (coun-
              tries) allowed. By default d = 0, which means that there  is  no
              limit.

       -d d   The  integer  d  specifies  the  random  seed  used during color
              assignment optimization that maximize color  difference  between
              neighboring countries.

       -D     If  specified, the graph's cluster subgraphs are used to specify
              the clustering.

       -e     If specified, edges will be included in the final output.

       -g c   Specifies the bounding box color. If not specified,  a  bounding
              box is not drawn.

       -h k   The  number  of  artificial  points  added  to maintain a bridge
              between endpoints. By default, this is zero.

       -highlight=k
              Only draw cluster k. By default, all clusters are drawn.

       -k     If specified, increases the randomness of outer boundary.

       -l s   Use the string s as a label for the drawing.

       -m v   Generate a margin of v points around the  drawing.  By  default,
              this is determined by gvmap.

       -O     Do  NOT  do  color  assignment optimization that maximizes color
              differences between neighboring countries

       -o<file>
              Put output in <file>. Default output is stdout

       -p k   Indicates what level of points should be shown. By  default,  no
              points are shown.

          Acceptable values are:
                 0 : no points
                 1 : all points
                 2 : label points
                 3 : random/artificial points

       -Q     Use  modularity  quality  for clustering rather than the default
              modularity clustering.

       -r k   The number of random points k (integer) used to define  sea  and
              lake boundaries. If 0, auto assigned. By default v = 0

       -s v   The real number v specifies the depth of the sea and lake shores
              in points. If 0, auto assigned. By default v = 0.

       -t n   Make n attempts to improve cluster contiguity.

       -v     Verbose mode.

       -z c   Specified the polygon line color. Default is black.

       -?     Print usage and exit.


EXAMPLES

       Given a graph foo.gv, one way to generate a layout  and  highlight  the
       clusters  is  to  first  select a layout engine with a suitable overlap
       removal method, then feed the output to gvmap, and finally  render  the
       map using specific graphics format. For example, the following pipeline
       creates a map with edges in semi-transparent light gray and nodes  laid
       out using sfdp:

       sfdp  -Goverlap=prism  foo.gv  | gvmap -e | neato -n2 -Ecolor=#55555522
       -Tpng > foo.png

       The shell script gvmap.sh provides a shorthand for such pipelines.  For
       example, the above pipeline can be achieved using

       gvmap.sh -Ae -Ecolor=#55555522 -Tpng foo.gv > foo.png




AUTHOR

       Yifan Hu <yifanhu@yahoo.com>


SEE ALSO

       gvmap.sh(1), sfdp(1), neato(1), gvpr(1)

       E.  R.  Gansner,  Y.  Hu, S. G. Kobourov, "GMap: Visualizing graphs and
       clusters as maps," Proc. Pacific Vis. 2010, pp. 201-208.



                                 3 March 2011                         gvmap(1)

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