R/qgis_createrandomgammarasterlayer.R

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

##' QGIS Algorithm provided by QGIS (native c++) Create random raster layer (gamma distribution) (native:createrandomgammarasterlayer). Generates a raster layer for given extent and cell size filled with gamma distributed random values. By default, the values will be chosen given an alpha and beta value of 1.0. This can be overridden by using the advanced parameter for alpha and beta. The raster data type is set to Float32 by default as the gamma distribution random values are floating point numbers.
##'
##' @title QGIS algorithm - Create random raster layer (gamma distribution)
##'
##' @param EXTENT `extent` - Desired extent. A comma delimited string of x min, x max, y min, y max. E.g. '4,10,101,105'. Path to a layer. The extent of the layer is used..
##' @param TARGET_CRS `crs` - Target CRS. CRS as an auth ID (e.g. 'EPSG:3111'). CRS as a PROJ4 string (e.g. 'PROJ4:…'). CRS as a WKT string (e.g. 'WKT:…'). Path to a layer. The CRS of the layer is used..
##' @param PIXEL_SIZE `number` - Pixel size. A numeric value. field:FIELD_NAME to use a data defined value taken from the FIELD_NAME field. expression:SOME EXPRESSION to use a data defined value calculated using a custom QGIS expression.
##' @param OUTPUT_TYPE `enum`  of `("Float32", "Float64")` - Output raster data type. Number of selected option, e.g. '1'. Comma separated list of options, e.g. '1,3'.
##' @param ALPHA `number` - Alpha. A numeric value. field:FIELD_NAME to use a data defined value taken from the FIELD_NAME field. expression:SOME EXPRESSION to use a data defined value calculated using a custom QGIS expression.
##' @param BETA `number` - Beta. A numeric value. field:FIELD_NAME to use a data defined value taken from the FIELD_NAME field. expression:SOME EXPRESSION to use a data defined value calculated using a custom QGIS expression.
##' @param OUTPUT `rasterDestination` - Output raster. 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
##' * OUTPUT - outputRaster - Output raster
##'
##'
##' @export
##' @md
##' @importFrom qgisprocess qgis_run_algorithm

qgis_createrandomgammarasterlayer <- function(EXTENT = qgisprocess:::qgis_default_value(), TARGET_CRS = qgisprocess:::qgis_default_value(), PIXEL_SIZE = qgisprocess:::qgis_default_value(), OUTPUT_TYPE = qgisprocess:::qgis_default_value(), ALPHA = qgisprocess:::qgis_default_value(), BETA = qgisprocess:::qgis_default_value(), OUTPUT = qgisprocess:::qgis_default_value(),..., .complete_output = .complete_output_option(), .quiet = .quiet_option(), .messages = .message_option()) {

  check_algorithm_necessities("native:createrandomgammarasterlayer")

  if (.messages){
    output <- qgisprocess::qgis_run_algorithm("native:createrandomgammarasterlayer", `EXTENT` = EXTENT, `TARGET_CRS` = TARGET_CRS, `PIXEL_SIZE` = PIXEL_SIZE, `OUTPUT_TYPE` = OUTPUT_TYPE, `ALPHA` = ALPHA, `BETA` = BETA, `OUTPUT` = OUTPUT,..., .quiet = .quiet)
  } else {
    suppressMessages(
      output <- qgisprocess::qgis_run_algorithm("native:createrandomgammarasterlayer", `EXTENT` = EXTENT, `TARGET_CRS` = TARGET_CRS, `PIXEL_SIZE` = PIXEL_SIZE, `OUTPUT_TYPE` = OUTPUT_TYPE, `ALPHA` = ALPHA, `BETA` = BETA, `OUTPUT` = OUTPUT,..., .quiet = .quiet)
      )
  }

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