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10c92394e7
Adds a new method to QgsGeometry for merging linestrings. By passing a multilinestring, any connected lines will be joined into single linestrings. Behind the scenes this uses GEOS' line merge. A corresponding expression function "line_merge" has also been added.
10 lines
721 B
Plaintext
10 lines
721 B
Plaintext
{
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"name": "line_merge",
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"type": "function",
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"description":"Returns a LineString or MultiLineString geometry, where any connected LineStrings from the input geometry have been merged into a single linestring. This function will return null if passed a geometry which is not a LineString/MultiLineString.",
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"arguments": [ {"arg":"geometry","description":"a LineString/MultiLineString geometry"} ],
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"examples": [ { "expression":"geom_to_wkt(line_merge(geom_from_wkt('MULTILINESTRING((0 0, 1 1),(1 1, 2 2))')))", "returns":"'LineString(0 0,1 1,2 2)'"},
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{ "expression":"geom_to_wkt(line_merge(geom_from_wkt('MULTILINESTRING((0 0, 1 1),(11 1, 21 2))')))", "returns":"'MultiLineString((0 0, 1 1),(11 1, 21 2)'"}]
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}
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