This is a very fast version of cir with allowOverlap = TRUE, allowDuplicates = FALSE, returnIndices = TRUE, returnDistancse = TRUE, and includeBehaviour = "excludePixels". It is used inside spread2, when asymmetry is active. The basic algorithm is to run cir just once, then add to the xy coordinates of every locus
.cirSpecialQuick(landscape, loci, maxRadius, minRadius)
Raster on which the circles are built.
Numeric. An alternative to
coords. These are the indices on
landscape to initiate this function. See
coords. Default is one
point in centre of
Numeric vector of length 1 or same length as coords
Numeric vector of length 1 or same length as
coords. Default is
maxRadius, meaning return all cells that are touched
by the narrow ring at that exact radius. If smaller than
then this will create a buffer or donut or ring.