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

       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.

       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


       -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.

              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

              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

       -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.

       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

       Yifan Hu <yifanhu@research.att.com>

       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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