QGIS/resources/function_help/json/num_interior_rings

{
  "name": "num_interior_rings",
  "type": "function",
  "description": "Returns the number of interior rings in a polygon or geometry collection, or null if the input geometry is not a polygon or collection.",
  "arguments": [ {"arg":"geometry","description":"input geometry"} ],
  "examples": [ { "expression":"num_interior_rings(geom_from_wkt('POLYGON((-1 -1, 4 0, 4 2, 0 2, -1 -1),(-0.1 -0.1, 0.4 0, 0.4 0.2, 0 0.2, -0.1 -0.1))'))", "returns":"1"}]
}
[FEATURE] More geometry functions for expressions - add accessors: geometry_n, interior_ring_n - add num_geometries, num_rings, num_interior_rings - add nodes_to_points for converting every node in a geometry to a multipoint geometry - add segments_to_lines for converting every segment in a geometry to a multiline geometry nodes_to_points and segments_to_lines are intended for use with geometry generator symbology, eg to allow use of m and z values for nodes/lines with data defined symbology. 2015-12-15 07:39:43 +11:00			`{`
			`"name": "num_interior_rings",`
			`"type": "function",`
			`"description": "Returns the number of interior rings in a polygon or geometry collection, or null if the input geometry is not a polygon or collection.",`
			`"arguments": [ {"arg":"geometry","description":"input geometry"} ],`
			`"examples": [ { "expression":"num_interior_rings(geom_from_wkt('POLYGON((-1 -1, 4 0, 4 2, 0 2, -1 -1),(-0.1 -0.1, 0.4 0, 0.4 0.2, 0 0.2, -0.1 -0.1))'))", "returns":"1"}]`
			`}`