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16 lines
1.5 KiB
Plaintext
16 lines
1.5 KiB
Plaintext
{
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"name": "single_sided_buffer",
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"type": "function",
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"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.",
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"arguments": [ {"arg":"geometry","description":"a (multi)linestring geometry"},
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{"arg":"distance","description":"buffer distance. Positive values will be buffered to the left of lines, negative values to the right"},
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{"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."},
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{"arg":"join","optional":true,"default":"1","description":"join style for corners, where 1 = round, 2 = miter and 3 = bevel"},
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{"arg":"miter_limit","optional":true,"default":"2.0","description":"limit on the miter ratio used for very sharp corners (when using miter joins only)"}],
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"examples": [ { "expression":"single_sided_buffer($geometry, 10.5)", "returns":"line buffered to the left by 10.5 units"},
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{ "expression":"single_sided_buffer($geometry, -10.5)", "returns":"line buffered to the right by 10.5 units"},
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{ "expression":"single_sided_buffer($geometry, 10.5, segments=16, join=1)", "returns":"line buffered to the left by 10.5 units, using more segments to result in a smoother buffer"},
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{ "expression":"single_sided_buffer($geometry, 10.5, join=3)", "returns":"line buffered to the left by 10.5 units, using a beveled join"}]
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}
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