A 1-planar graph is a graph that can be drawn in the Euclidean plane in such a way that each edge has at most one crossing point, where it crosses a single additional edge. 1 planar graph
I read the following paper, which stated the following fact about the rectilinear drawing of a 1-plane graph.
Thomassen, C. (1988), Rectilinear drawings of graphs. J. Graph Theory, 12: 335-341.https://doi.org/10.1002/jgt.3190120306
Theorem 3.1. Let $G$ be a graph represented as a normal drawing of index $0$ or $1$. Then there exists a rectilinear drawing equivalent to $G$ if and only if $G$ contains no $B-$ or $W-$configuration.
From this theorem we know that a 1-planar graph satisfies any 1-plane drawing of it without $B-$ and $W-$configuration, then it has no rectilinear drawing.
But I haven't constructed a 1-planar graph without rectilinear drawing so far. It is even doubtful that it exists. This is one of my confusing points. Any advice would be helpful and thanks in advance!
Some concepts are added below:
Every finite graph can be drawn in the Euclidean plane such that any two edges have at most one point in common (in particular, two edges with a common end have no other point in common), and such that every point that is not a vertex and that is on two edges is on precisely two edges and is a cross-point for these two edges. We call such a drawing normal.
The maximum number of crosspoints on an edge is called the cross-index of the drawing.