R/sagang_slopelength.R

In JanCaha/r_package_qgis: An extension of package "qgisprocess" providing direct R functions for QGIS functions

##' QGIS Algorithm provided by SAGA Next Gen Slope length (sagang:slopelength). ---------------- Arguments ----------------  DEM: Elevation 	Argument type:	raster 	Acceptable values: 		- Path to a raster layer LENGTH: Slope Length 	Argument type:	rasterDestination 	Acceptable values: 		- Path for new raster layer
##'
##' @title QGIS algorithm - Slope length
##'
##' @param DEM `raster` - Elevation. Path to a raster layer.
##' @param LENGTH `rasterDestination` - Slope Length. Path for new raster layer.
##' @param ... further parameters passed to `qgisprocess::qgis_run_algorithm()`
##' @param .complete_output logical specifying if complete out of `qgisprocess::qgis_run_algorithm()` should be used (`TRUE`) or first output (most likely the main) should read (`FALSE`). Default value is `TRUE`.
##' @param .quiet logical specifying if parameter `.quiet` for `qgisprocess::qgis_run_algorithm()` Default value is `TRUE`.
##' @param .messages logical specifying if messages from `qgisprocess::qgis_run_algorithm()` should be printed (`TRUE`) or not (`FALSE`). Default value is `FALSE`.
##'
##' @details
##' ## Outputs description
##' * LENGTH - outputRaster - Slope Length
##'
##'
##' @export
##' @md
##' @importFrom qgisprocess qgis_run_algorithm

sagang_slopelength <- function(DEM = qgisprocess:::qgis_default_value(), LENGTH = qgisprocess:::qgis_default_value(),..., .complete_output = .complete_output_option(), .quiet = .quiet_option(), .messages = .message_option()) {

  check_algorithm_necessities("sagang:slopelength")

  if (.messages){
    output <- qgisprocess::qgis_run_algorithm("sagang:slopelength", `DEM` = DEM, `LENGTH` = LENGTH,..., .quiet = .quiet)
  } else {
    suppressMessages(
      output <- qgisprocess::qgis_run_algorithm("sagang:slopelength", `DEM` = DEM, `LENGTH` = LENGTH,..., .quiet = .quiet)
      )
  }

  if (.complete_output) {
    return(output)
  }
  else{
    qgisprocess::qgis_extract_output(output, "LENGTH")
  }
}