DiagrammeR (version 0.6)

grViz: R + viz.js

Description

Make diagrams in R using https://github.com/mdaines/viz.js{viz.js} with infrastructure provided by http://www.htmlwidgets.org/{htmlwidgets}.

Usage

grViz(diagram = "", engine = "dot", allow_subst = TRUE, options = NULL,
  width = NULL, height = NULL)

Arguments

diagram

http://graphviz.org{graphviz} spec for a diagram as either text, filename string, or file connection

engine

string for the Graphviz layout engine; can be "dot" (default), "neato", "circo", or "twopi". For more information see viz.js Usage{https://github.com/mdaines/viz.js#usage}.

allow_subst

a boolean that enables/disables subsitution functionality.

options

parameters supplied to the htmlwidgets framework.

width

an optional parameter for specifying the width of the resulting graphic in pixels.

height

an optional parameter for specifying the height of the resulting graphic in pixels.

Value

• An object of class htmlwidget that will intelligently print itself into HTML in a variety of contexts including the R console, within R Markdown documents, and within Shiny output bindings.

Examples

# A very simple example
grViz("digraph {A;}")

# A slightly more involved example
#  using example from http://www.graphviz.org/pdf/dotguide.pdf
#    "Drawing graphs with dot"
#    Emden R. Gansner and Eleftherios Koutsofios and Stephen North
#    January 5, 2015
grViz('
digraph G {
      size = "4,4";
      main [shape = box]; /* this is a comment */
      main -> parse [weight = 8];
      parse -> execute;
      main -> init [style = dotted];
      main -> cleanup;
      execute -> { make_string; printf}
      init -> make_string;
      edge [color = red]; // so is this
      main -> printf;
      node [shape = box, style = filled, color = ".7 .3 1.0"];
      execute -> compare;
}
')