QGIS/resources/function_help/json/line_interpolate_point

{
  "name": "line_interpolate_point",
  "type": "function",
  "groups": ["GeometryGroup"],
  "description": "Returns the point interpolated by a specified distance along a linestring geometry.",
  "arguments": [{
    "arg": "geometry",
    "description": "a linestring geometry"
  }, {
    "arg": "distance",
    "description": "distance along line to interpolate"
  }],
  "examples": [{
    "expression": "geom_to_wkt(line_interpolate_point(geometry:=geom_from_wkt('LineString(0 0, 8 0)'), distance:=5))",
    "returns": "'Point (5 0)'"
  }, {
    "expression": "geom_to_wkt(line_interpolate_point(geometry:=geom_from_wkt('LineString(0 0, 1 1, 2 0)'), distance:=2.1))",
    "returns": "'Point (1.48492424 0.51507576)'"
  }, {
    "expression": "geom_to_wkt(line_interpolate_point(geometry:=geom_from_wkt('LineString(0 0, 1 0)'), distance:=2))",
    "returns": "NULL"
  }],
  "tags": ["distance", "interpolated", "linestring", "point", "specified", "along"]
}