The type of an edge connecting two vertices or a gridline.
"primary": Prime-wise connection between two vertices.
"primary"
"custom": User-defined connection between two vertices.
"custom"
"auxiliary": Connection where at least one vertex is auxiliary.
"auxiliary"
"gridline": Line extending across the screen.
"gridline"
The type of an edge connecting two vertices or a gridline.
"primary": Prime-wise connection between two vertices."custom": User-defined connection between two vertices."auxiliary": Connection where at least one vertex is auxiliary."gridline": Line extending across the screen.