digraph article {

node [style = "filled"]

node [shape = "ellipse" fillcolor="pink"]

"dot"
"knitr::knit"
"pandoc"
"rmarkdown::render"

node [shape = "note" fillcolor="white"]

"article.Rmd"
"figure.gv"

node [shape = "note" fillcolor="lightgray"]

"article.md"
"figure.png"

node [shape = "note" fillcolor="lightblue"]

"article.html"

"article.Rmd" -> "rmarkdown::render" -> "article.html"
"article.Rmd" -> "knitr::knit" -> "article.md" -> "pandoc" -> "article.html"
"figure.gv" -> "dot" -> "figure.png"
"figure.png" -> "article.html"
}