{
  "name": "scale",
  "type": "function",
  "groups": ["GeometryGroup"],
  "description": "Returns a scaled version of a geometry. Calculations are in the Spatial Reference System of this geometry.",
  "arguments": [ {"arg":"geometry","description":"a geometry"},
                 {"arg":"x_scale","description":"x-axis scaling factor"},
                 {"arg":"y_scale","description":"y-axis scaling factor"},
                 {"arg":"center", "optional":true,"description":"scaling center point. If not specified, the center of the geometry's bounding box is used."}
               ],
  "examples": [ { "expression":"scale($geometry, 2, 0.5, make_point(4, 5))", "returns":"geometry scaled twice horizontally and halved vertically, around the (4, 5) point"},
{ "expression":"scale($geometry, 2, 0.5)", "returns":"geometry twice horizontally and halved vertically, around the center of its bounding box"}]
}