docs: Add a function example with ggraph to the README (#10)

* docs: Add a function example with ggraph to the README

* Apply suggestions from code review

Co-authored-by: Danilo Imparato <13784115+daniloimparato@users.noreply.github.com>

* Update README.md

Co-authored-by: Danilo Imparato <13784115+daniloimparato@users.noreply.github.com>

* docs: Update the text in the rmd as well

---------

Co-authored-by: Danilo Imparato <13784115+daniloimparato@users.noreply.github.com>

README.Rmd

@@ -63,6 +63,28 @@ igraph::V(g)$color <- sample(rainbow(5), number_of_vertices, replace = TRUE)
 plot(g, layout = easylayout, vertex.label = NA, margin = 0)
 ```
 
+You can also run easylayout as a standalone function, attributing its output
+to a variable in your R environment. The output is just a 2-column matrix:
+
+```{r layout_func, eval = FALSE}
+layout <- easylayout(g)
+```
+
+Once you store the final coordinates to a variable, use any plotting package to
+display the network. In the example below, we plot the network using ggraph.
+
+```{r ggraph, eval = FALSE}
+V(g)$x <- layout[, 1]
+V(g)$y <- layout[, 2]
+
+ggraph::ggraph(g, layout = layout) +
+  ggraph::geom_edge_link() +
+  ggraph::geom_node_point(aes(color = color)) +
+  ggplot2::coord_fixed() +
+  ggplot2::theme_void()
+```
+
+
 ## Future work
 
 The current implementation focuses on the R ecosystem, but using web

README.md

@@ -54,6 +54,24 @@ igraph::V(g)$color <- sample(rainbow(5), number_of_vertices, replace = TRUE)
 plot(g, layout = easylayout, vertex.label = NA, margin = 0)
 ```
 
+You can also run easylayout as a standalone function, attributing its output
+to a variable in your R environment. The output is just a 2-column matrix:
+
+``` r
+layout <- easylayout(g)
+```
+
+Once you store the final coordinates to a variable, use any plotting package to
+display the network. In the example below, we plot the network using ggraph.
+
+``` r
+ggraph::ggraph(g, layout = layout) +
+  ggraph::geom_edge_link() +
+  ggraph::geom_node_point(aes(color = color)) + 
+  ggplot2::coord_fixed() +
+  ggplot2::theme_void()
+```
+
 ## Future work
 
 The current implementation focuses on the R ecosystem, but using web