ST_LineExtend
Prev  7.5. Editores de geometria  Next

Name

ST_LineExtend — Returns a line extended forwards and backwards by specified distances.

Synopsis

geometry ST_LineExtend(geometry line, float distance_forward, float distance_backward=0.0);

Descrição

Returns a line extended forwards and backwards by adding new start (and end) points at the given distance(s). A distance of zero does not add a point. Only non-negative distances are allowed. The direction(s) of the added point(s) is determined by the first (and last) two distinct points of the line. Duplicate points are ignored.

Availability: 3.4.0

Example: Extends a line 5 units forward and 6 units backward

SELECT ST_AsText(ST_LineExtend('LINESTRING(0 0, 0 10)'::geometry, 5, 6));
--------------------------------------------
LINESTRING(0 -6,0 0,0 10,0 15)