Triangle mask helpers for recursive gasket families

Convenience constructors for the four-slot triangle masks used by edges.recursive.triangle.mask() and recursive.triangle.mask.surface.graph(). The slots correspond to the three corner subtriangles and the central inverted subtriangle created by one barycentric refinement of an equilateral triangle.

Usage

mask.triangle.classic()

mask.triangle.bridge(missing = c("top", "left", "right"))

Arguments

missing

Which outer corner is omitted in mask.triangle.bridge().

Value

A named logical vector of length 4.

Details

The returned mask entries are ordered and named as left, right, top, and center.