Mask pattern helpers for recursive grid families — mask_pattern

Convenience constructors for connected \(k \times k\) keep-masks that can be passed to recursive.mask.grid.surface.graph() to build generalized mask carpets. These helpers are meant to provide explicit benchmark motifs such as cross, border, corner, and asymmetric-hole patterns.

Usage

mask.cross(k = 5, arm.width = 1)

mask.border(k = 5, thickness = 1)

mask.corner(
  k = 5,
  width = 2,
  corner = c("top_left", "top_right", "bottom_left", "bottom_right")
)

mask.asymmetric.holes(k = 5, hole.size = 1)

Arguments

k: Mask side length.
arm.width: Width of the retained cross arms.
thickness: Border thickness for mask.border().
width: Side length of the retained corner block for mask.corner().
corner: Which corner to retain in mask.corner().
hole.size: Side length of each removed interior hole block for mask.asymmetric.holes().

Value

A logical \(k \times k\) keep-mask.

Details

The returned masks use standard matrix display orientation: rows run from top to bottom and columns run from left to right.

Examples

asymmetric <- mask.asymmetric.holes(k = 5, hole.size = 1)
border <- mask.border(k = 5, thickness = 1)
corner <- mask.corner(k = 5, width = 2, corner = "top_left")
cross <- mask.cross(k = 5, arm.width = 1)