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#' @title Regular grid in alpha-hull
#'
#' @description Create a grid within the alpha hull of a set of points.
#'
#' @details This function creates a rectangular grid over a set of points, then
#' computes the alpha hull of the set of points, and discards all the points
#' of the new grid that fall outside of the hull.
#'
#' @param coords A matrix or data.frame of coordinates with two columns
#'
#' @param npts The number of points before cropping to the alpha hull shape
#'
#' @param grid_opts A list with component \code{alpha} that controls the shape
#' of the alpha hull (see details).
#'
#' @param pad Ignored
#'
#' @return The coordinates of a grid of points as a \code{data.frame} with
#' \code{ncol(coords)} columns. Names are transfered from the
#' \code{coords} data frame.
#'
#' @details This function computes the alpha hull of a set of points which is
#' an estimate of its overall outline. The intricateness of this outline
#' is determined by the \code{alpha} parameter: a value close to zero will
#' produce a very intricate outline and a high value will produce a coarse
#' outline (similar to the convex hull). It is highly recommended to try
#' different values of \code{alpha} to see what is most appropriate for one's
#' datasets.
#'
#' @seealso \code{\link[alphahull]{ahull}}
#'
#' @family grid building functions
#'
#'@export
build_grid_ahull_crop <- function(coords, npts,
pad = NULL, # pad is ignored for this function
grid_opts = list(alpha = .3,
scale_alpha = TRUE)) {
build_grid_ahull_fill(coords, npts,
grid_opts = c(grid_opts,
list(run_max = 1,
verbose = FALSE)))
}
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