How to use GraphViz graphs in DiagrammeR for R - r

Question

I am trying to use a GraphViz graph in DiagrammeR. How can I do this?
myGraph = grViz("
digraph boxes_and_circles {
# a 'graph' statement
graph [overlap = true, fontsize = 10]
# several 'node' statements
node [shape = box,
fontname = Helvetica]
A; B; C; D; E; F
node [shape = circle,
fixedsize = true,
width = 0.9] // sets as circles
1; 2; 3; 4; 5; 6; 7; 8
# several 'edge' statements
A->1 B->2 B->3 B->4 C->A
1->D E->A 2->4 1->5 1->F
E->6 4->6 5->7 6->7 3->8
}
")
and then I want to use it in DiagrammeR, but it will not allow it.
render_graph(myGraph)
Gives:
Error: class(graph) == "dgr_graph" are not all TRUE
Is there a way I need to convert or input the GraphViz graph into the DiagrammeR environment?

Answer 1

grViz takes a string describing the graph (vis.js style) : it is the interpreted by vis.js. Its return value is then an htmlwidget object.
render_graph takes a dgr_graph object, created using the create_graph function.
you can see in the DiagrammeR doc
library(DiagrammeR)
# Create a simple NDF
nodes <-
create_nodes(
nodes = 1:4,
type = "number")
# Create a simple EDF
edges <-
create_edges(
from = c(1, 1, 3, 1),
to = c(2, 3, 4, 4),
rel = "related")
# Create the graph object,
# incorporating the NDF and
# the EDF, and, providing
# some global attributes
graph <-
create_graph(
nodes_df = nodes,
edges_df = edges,
graph_attrs = "layout = neato",
node_attrs = "fontname = Helvetica",
edge_attrs = "color = gray20")
# View the graph
render_graph(graph)
DiagrammeR can produce Graphviz code : From the doc mentioned below : "If you'd like to return the Graphviz DOT code (to, perhaps, share it or use it directly with the Graphviz command-line utility), just use output = "DOT" in the render_graph()"
So
you can use create_graph to produce graphviz dot code
you can use graphviz dot code directly with grViz in DiagrammeR

Answer 2

Here the problem is with render_graph(myGraph), using just myGraph works like charm.
library(DiagrammeR)
myGraph = grViz("
digraph boxes_and_circles {
# a 'graph' statement
graph [overlap = true, fontsize = 10]
# several 'node' statements
node [shape = box,
fontname = Helvetica]
A; B; C; D; E; F
node [shape = circle,
fixedsize = true,
width = 0.9] // sets as circles
1; 2; 3; 4; 5; 6; 7; 8
# several 'edge' statements
A->1 B->2 B->3 B->4 C->A
1->D E->A 2->4 1->5 1->F
E->6 4->6 5->7 6->7 3->8
}
")
myGraph
render_graph(myGraph) Does not work in R.
Just myGraph works fine.