gvmap - find clusters and create a geographical map highlighting clusters.
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 clusters 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 addition, 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 countries. 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 (countries) 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 -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.
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
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. 201208. 3 March 2011 GVMAP(1)
Personal Opportunity - Free software gives you access to billions of dollars of software at no cost. Use this software for your business, personal use or to develop a profitable skill. Access to source code provides access to a level of capabilities/information that companies protect though copyrights. Open source is a core component of the Internet and it is available to you. Leverage the billions of dollars in resources and capabilities to build a career, establish a business or change the world. The potential is endless for those who understand the opportunity.
Business Opportunity - Goldman Sachs, IBM and countless large corporations are leveraging open source to reduce costs, develop products and increase their bottom lines. Learn what these companies know about open source and how open source can give you the advantage.
Free Software provides computer programs and capabilities at no cost but more importantly, it provides the freedom to run, edit, contribute to, and share the software. The importance of free software is a matter of access, not price. Software at no cost is a benefit but ownership rights to the software and source code is far more significant.
Free Office Software - The Libre Office suite provides top desktop productivity tools for free. This includes, a word processor, spreadsheet, presentation engine, drawing and flowcharting, database and math applications. Libre Office is available for Linux or Windows.
The Free Books Library is a collection of thousands of the most popular public domain books in an online readable format. The collection includes great classical literature and more recent works where the U.S. copyright has expired. These books are yours to read and use without restrictions.
Source Code - Want to change a program or know how it works? Open Source provides the source code for its programs so that anyone can use, modify or learn how to write those programs themselves. Visit the GNU source code repositories to download the source.
Study at Harvard, Stanford or MIT - Open edX provides free online courses from Harvard, MIT, Columbia, UC Berkeley and other top Universities. Hundreds of courses for almost all major subjects and course levels. Open edx also offers some paid courses and selected certifications.
Linux Manual Pages - A man or manual page is a form of software documentation found on Linux/Unix operating systems. Topics covered include computer programs (including library and system calls), formal standards and conventions, and even abstract concepts.