Minimal mesh.

The simplest pairing of two polygons with one shared edge. One polygon contains a hole and a concavity, the other is a simply convex. This is composed of four "arcs", one around each polygon, one for the shared edge, and one for the isolated hole. There are two nodes, the endpoints of the single shared edge.

Examples

arc <- ARC(minimal_mesh)
plot(arc)

sc_arc(arc)
#> # A tibble: 4 × 2
#>   arc_   ncoords_
#>   <chr>     <int>
#> 1 QWeiEE        7
#> 2 W9qns6        6
#> 3 e1N3d1        4
#> 4 kSZLr2        4
sc_node(arc)
#> # A tibble: 2 × 1
#>   vertex_
#>   <chr>  
#> 1 Jjz9kT 
#> 2 KC81wE