##' QGIS Algorithm provided by SAGA Next Gen Polygon generalization (sagang:polygongeneralization). ---------------- Arguments ---------------- POLYGONS: Shapes Argument type: source Acceptable values: - Path to a vector layer GENERALIZED: Shape Indices Argument type: vectorDestination Acceptable values: - Path for new vector layer THRESHOLD: Threshold Default value: 100 Argument type: number Acceptable values: - 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
##'
##' @title QGIS algorithm - Polygon generalization
##'
##' @param POLYGONS `source` - Shapes. Path to a vector layer.
##' @param GENERALIZED `vectorDestination` - Shape Indices. Path for new vector layer.
##' @param THRESHOLD `number` - Threshold. 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 ... 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
##' * GENERALIZED - outputVector - Shape Indices
##'
##'
##' @export
##' @md
##' @importFrom qgisprocess qgis_run_algorithm
sagang_polygongeneralization <- function(POLYGONS = qgisprocess:::qgis_default_value(), GENERALIZED = qgisprocess:::qgis_default_value(), THRESHOLD = qgisprocess:::qgis_default_value(),..., .complete_output = .complete_output_option(), .quiet = .quiet_option(), .messages = .message_option()) {
check_algorithm_necessities("sagang:polygongeneralization")
if (.messages){
output <- qgisprocess::qgis_run_algorithm("sagang:polygongeneralization", `POLYGONS` = POLYGONS, `GENERALIZED` = GENERALIZED, `THRESHOLD` = THRESHOLD,..., .quiet = .quiet)
} else {
suppressMessages(
output <- qgisprocess::qgis_run_algorithm("sagang:polygongeneralization", `POLYGONS` = POLYGONS, `GENERALIZED` = GENERALIZED, `THRESHOLD` = THRESHOLD,..., .quiet = .quiet)
)
}
if (.complete_output) {
return(output)
}
else{
qgisprocess::qgis_extract_output(output, "GENERALIZED")
}
}
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