Oops, here is the complete code:
pointGeom << ST_Intersection( ST_MakeLine(
ST_MakePoint(ST_XMin(lineGeom), ST_Y(pointGeom)),
ST_MakePoint(ST_XMax(lineGeom), ST_Y(pointGeom))
), lineGeom
)
On 07/23/2013 04:31 PM, Denis Rouzaud wrote:
Hi Andreas,
Do you mean you want to test to a segment?
Because, I can't see a true answer for a line.
If you want to do test to a segment, it should do the job to test if
the intersection with the horizontal line (dy=0) over your point and
your input line is on the left/right to your point.
So, maybe test:
pointGeom << ST_Intersection( ST_MakeLine(
ST_MakePoint(ST_XMin(lineGeom), ST_Y(pointGeom)),
ST_MakePoint(ST_XMax(lineGeom), ST_Y(pointGeom))
)
You have to handle the case where your segment is horizontal, but then
a simple test with ST_Xmin/max should be enough.
Cheers,
Denis
On 07/23/2013 03:54 PM, Andreas Neumann wrote:
Hi,
I want to test a point if it is left-of or right-of a given LINESTRING.
I found the << >> and &< &> but they do not behave like I expected.
Perhaps it is because they only test on the bounding box level and not
on the real geometry?
Is there a left/right of test available on the geometry instead of the
bounding box?
Thank you,
Andreas
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