The planar drawing algorithm calculates positions for the nodes in the plane. These coordinates satisfy that if the edges are represented with straight lines, then they will not intersect each other.
Value
A named list of 1) "is_planar": a logical
of if the graph is
planar, 2) "x_coords": the x-coordinate of the planar embedding, 3)
"y_coords": the y-coordinate of the planar embedding
Details
See https://lemon.cs.elte.hu/pub/doc/1.3.1/a00307.html for more information.