Re: [OctDev] signed distance of point from polygon

[c. <kin...@ti...>]

On 10 Sep 2012, at 13:01, c. wrote:

> Hi,
> 
> I need to compute the "signed distance" of a point P from a polygon Q,
> i.e., the distance of P from the polyline including Q with a "+" sign if
> the point is inside the polygon and a "-" sign if it is outside.
> 
> I see "distancePointPolygon" in the geometry package computes the distance
> but always returns a positive number. Is there already a function to do 
> what I need?
> 
> If not, any idea where I can look-up the algorithm to modify "distancePointPolygon"
> according to my needs?
> 
> Thanks,
> c.

To answer my own question, I just found the built-in function "inpolygon" that checks whether a point is inside or outside a polygon.
Sorry for the noise.
c.