Clean up and extend expression geometry functions:
- New expression functions for area(geom), perimeter(geom),
point_n(geom), start_point(geom), end_point(geom), make_point(x,y)
- Add new variant to length() function which takes a geometry object,
allows for length(geom) evaluation.
- Rename x_at, y_at to $x_at, $y_at (alias old names) to reflect that
these only work on current feature geometry
- Add x(geom), y(geom) functions which return x and y coordinate
for point geometries or centroid x/y for non-point geometries
(fix #11008)
2015-09-18 05:41:38 +10:00
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{
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2015-09-20 17:12:43 +02:00
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"name": "x",
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"type": "function",
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2020-07-02 01:46:48 +01:00
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"groups": ["GeometryGroup"],
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2020-07-12 01:07:32 +02:00
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"description": "Returns the x coordinate of a point geometry, or the x coordinate of the centroid for a non-point geometry.",
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2022-01-07 08:33:29 -05:00
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"arguments": [{
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"arg": "geometry",
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"description": "a geometry"
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}],
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"examples": [{
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"expression": "x( geom_from_wkt( 'POINT(2 5)' ) )",
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"returns": "2"
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}, {
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"expression": "x( $geometry )",
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"returns": "x coordinate of the current feature's centroid"
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}],
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"tags": ["centroid", "point", "coordinate"]
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Clean up and extend expression geometry functions:
- New expression functions for area(geom), perimeter(geom),
point_n(geom), start_point(geom), end_point(geom), make_point(x,y)
- Add new variant to length() function which takes a geometry object,
allows for length(geom) evaluation.
- Rename x_at, y_at to $x_at, $y_at (alias old names) to reflect that
these only work on current feature geometry
- Add x(geom), y(geom) functions which return x and y coordinate
for point geometries or centroid x/y for non-point geometries
(fix #11008)
2015-09-18 05:41:38 +10:00
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}
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