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[FEATURE] Expression functions for offset_curve and single_sided_buffer
Especially useful with geometry generators!
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{ | ||
"name": "offset_curve", | ||
"type": "function", | ||
"description": "Returns a geometry formed by offseting a linestring geometry to the side. Distances are in the Spatial Reference System of this geometry.", | ||
"arguments": [ {"arg":"geometry","description":"a (multi)linestring geometry"}, | ||
{"arg":"distance","description":"offset distance. Positive values will be buffered to the left of lines, negative values to the right"}, | ||
{"arg":"segments","optional":true,"default":"8","description":"number of segments to use to represent a quarter circle when a round join style is used. A larger number results in a smoother line with more nodes."}, | ||
{"arg":"join","optional":true,"default":"1","description":"join style for corners, where 1 = round, 2 = mitre and 3 = bevel"}, | ||
{"arg":"mitre_limit","optional":true,"default":"2.0","description":"limit on the mitre ratio used for very sharp corners (when using mitre joins only)"}], | ||
"examples": [ { "expression":"offset_curve($geometry, 10.5)", "returns":"line offset to the left by 10.5 units"}, | ||
{ "expression":"offset_curve($geometry, -10.5)", "returns":"line offset to the right by 10.5 units"}, | ||
{ "expression":"offset_curve($geometry, 10.5, segments=16, join=1)", "returns":"line offset to the left by 10.5 units, using more segments to result in a smoother curve"}, | ||
{ "expression":"offset_curve($geometry, 10.5, join=3)", "returns":"line offset to the left by 10.5 units, using a beveled join"}] | ||
} | ||
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Original file line number | Diff line number | Diff line change |
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{ | ||
"name": "single_sided_buffer", | ||
"type": "function", | ||
"description": "Returns a geometry formed by buffering out just one side of a linestring geometry. Distances are in the Spatial Reference System of this geometry.", | ||
"arguments": [ {"arg":"geometry","description":"a (multi)linestring geometry"}, | ||
{"arg":"distance","description":"buffer distance. Positive values will be buffered to the left of lines, negative values to the right"}, | ||
{"arg":"segments","optional":true,"default":"8","description":"number of segments to use to represent a quarter circle when a round join style is used. A larger number results in a smoother buffer with more nodes."}, | ||
{"arg":"join","optional":true,"default":"1","description":"join style for corners, where 1 = round, 2 = mitre and 3 = bevel"}, | ||
{"arg":"mitre_limit","optional":true,"default":"2.0","description":"limit on the mitre ratio used for very sharp corners (when using mitre joins only)"}], | ||
"examples": [ { "expression":"single_sided_buffer($geometry, 10.5)", "returns":"line buffered to the left by 10.5 units"}, | ||
{ "expression":"single_sided_buffer($geometry, -10.5)", "returns":"line buffered to the right by 10.5 units"}, | ||
{ "expression":"single_sided_buffer($geometry, 10.5, segments=16, join=1)", "returns":"line buffered to the left by 10.5 units, using more segments to result in a smoother buffer"}, | ||
{ "expression":"single_sided_buffer($geometry, 10.5, join=3)", "returns":"line buffered to the left by 10.5 units, using a beveled join"}] | ||
} | ||
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