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# ST_OffsetCurve
Returns a line at a given offset distance from a linear geometry. If the distance is positive, the offset is on the left side of the input line; if it is negative, it is on the right side. Returns null for empty geometries.
The optional third parameter `quadrantSegments` controls the number of line segments used to approximate a quarter circle at round joins. The default value is 8.
## Signatures
```sql theme={"system"}
ST_OffsetCurve(geometry: Geometry, distance: Double)
```
```sql theme={"system"}
ST_OffsetCurve(geometry: Geometry, distance: Double, quadrantSegments: Integer)
```
## Parameters
The linear geometry to offset.
The offset distance. Positive offsets to the left of the line; negative to the right.
The number of segments used to approximate a quarter circle at round joins. Defaults to 8.
## Return type
The offset line.
## Example
```sql theme={"system"}
SELECT ST_AsText(ST_OffsetCurve(ST_GeomFromWKT('LINESTRING(0 0, 10 0, 10 10)'), 5.0))
```
```
LINESTRING (0 5, 5 5, 5 10)
```
With a negative distance (offset to the right):
```sql theme={"system"}
SELECT ST_NPoints(ST_OffsetCurve(ST_GeomFromWKT('LINESTRING(0 0, 10 0, 10 10)'), -3.0))
```
```
11
```
With `quadrantSegments` set to 16:
```sql theme={"system"}
SELECT ST_NPoints(ST_OffsetCurve(ST_GeomFromWKT('LINESTRING(0 0, 10 0, 10 10)'), -3.0, 16))
```
```
19
```