Re: [OctDev] signed distance of point from polygon

[c. <car...@gm...>]

On 10 Sep 2012, at 13:20, JuanPi wrote:

> On Mon, Sep 10, 2012 at 1:01 PM, c. <car...@gm...> 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.
> 
> Hi,
> 
> I would not modify the function, but use it together with inpolygon
> (in the core geomtry package).
> 
> I guess this is what you want
> http://agora.octave.org/snippet/FRXH/
> 
> Let me know

Yes,
I had already answered my own qeustion seconds after I posted it ;)
Cool to see that snippets are working on the new Agora though ...
c.