{
  "name": "affine_transform",
  "type": "function",
  "groups": ["GeometryGroup"],
  "description": "Returns the geometry after an affine transformation. Calculations are in the Spatial Reference System of this geometry. The operations are performed in a scale, rotation, translation order. If there is a Z or M offset but the coordinate is not present in the geometry, it will be added.",
  "arguments": [
    {"arg":"geometry","description":"a geometry"},
    {"arg":"delta_x","description":"x-axis translation"},
    {"arg":"delta_y","description":"y-axis translation"},
    {"arg":"rotation_z","description":"rotation around z-axis in degrees counter-clockwise"},
    {"arg":"scale_x","description":"x-axis scale factor"},
    {"arg":"scale_y","description":"y-axis scale factor"},
    {"arg":"delta_z","optional":true,"default":"0","description":"z-axis translation"},
    {"arg":"delta_m","optional":true,"default":"0","description":"m-axis translation"},
    {"arg":"scale_z","optional":true,"default":"1","description":"z-axis scale factor"},
    {"arg":"scale_m","optional":true,"default":"1","description":"m-axis scale factor"}
  ],
  "examples": [
    { "expression":"geom_to_wkt(affine_transform(geom_from_wkt('LINESTRING(1 1, 2 2)'), 2, 2, 0, 1, 1))", "returns":"'LineString (3 3, 4 4)'"},
    { "expression":"geom_to_wkt(affine_transform(geom_from_wkt('POLYGON((0 0, 0 3, 2 2, 0 0))'), 0, 0, -90, 1, 2))", "returns":"'Polygon ((0 0, 6 0, 4 -2, 0 0))'"},
    { "expression":"geom_to_wkt(affine_transform(geom_from_wkt('POINT(3 1)'), 0, 0, 0, 1, 1, 5, 0))", "returns":"'PointZ (3 1 5)'"}
  ]
}