R/pixelsToY.R

In Weiming-Hu/RAnEnExtra: Extra functions for RAnEn

#' RAnEnExtra::pixelsToY
#'
#' RAnEnExtra::pixelsToY convert the pixel index
#' to its y coordinate counting row-wise. The start matters
#' because it sets the offset. The returned numbers are
#' counted from 1.
#'
#' @param pixels a vector of indices of pixels that
#' will get divided
#' @param xgrids.total total number of x.
#' @param start the counting start of pixels.
#'
#' @return y coordinate(s)
#' @export
pixelsToY <- function(
  pixels, xgrids.total, start) {
  return (floor((pixels - start) / xgrids.total) + 1)
}