Create a wrapper function that runs one algorithm — qgis

As opposed to qgis_run_algorithm(), qgis_function() creates a callable function based on the argument metadata provided by qgis_get_argument_specs().

Usage

qgis_function(algorithm, ...)

Arguments

algorithm: A qualified algorithm name (e.g., "native:buffer").
...: Algorithm arguments. These values are evaluated once and immediately, so you shouldn't call qgis_tmp_file() here.

Value

A function.

Details

The logic of qgis_function() has been implemented in R package qgis. This package also provides the QGIS documentation of each processing algorithm as corresponding R function documentation.

Examples

qgis_buffer <- qgis_function("native:buffer")
qgis_buffer(
  system.file(
    "longlake/longlake_depth.gpkg",
    package = "qgisprocess"
  ),
  DISTANCE = 10
)
#> Argument `SEGMENTS` is unspecified (using QGIS default value).
#> Using `END_CAP_STYLE = "Round"`
#> Using `JOIN_STYLE = "Round"`
#> Argument `MITER_LIMIT` is unspecified (using QGIS default value).
#> Argument `DISSOLVE` is unspecified (using QGIS default value).
#> Argument `SEPARATE_DISJOINT` is unspecified (using QGIS default value).
#> Using `OUTPUT = qgis_tmp_vector()`
#> <Result of `qgis_run_algorithm("native:buffer", ...)`>
#> List of 1
#>  $ OUTPUT: 'qgis_outputVector' chr "/tmp/Rtmp7nb1k0/file2b044d88ac6c/file2b04950ca3d.gpkg"