[mapserver-users] intersect

[Lowell Filak]

I don't believe 'intersect' is intended for use with a point. Check out:
http://www.ic.arizona.edu/~agave/agave_gis04b.htm for a quick diagram of what intersect is intended to do.
HTH
Lowell F.

The following message was sent by jef.mony at free.fr on Thu, 22 Aug 2002 10:43:09 +0200.

> Hi,
> 
> I noticed a little problem with the intersects function of the ShapeObj.
> I have two Shapes : a polygon and a point
> 
> 
>     $line = ms_newLineObj();
>     $line->addXY($Xmin,$Ymax);
>     $line->addXY($Xmax,$Ymax);
>     $line->addXY($Xmax,$Ymin);
>     $line->addXY($Xmin,$Ymin);
>     $line->addXY($Xmin,$Ymax);
>     $poly = ms_newShapeObj(MS_SHAPE_POLYGON);
>     $poly->add($line);
> 
>     $line2 = ms_newLineObj();
>     $line2->addXY($Xmin,$Ymax);
>     $poly2 = ms_newShapeObj(MS_SHAPE_POINT);
>     $poly2->add($line2);
> 
> If I try $poly->intersects($poly2) I have a wrong result, in fact it's like I 
> would have test the intersection between the pôint and the boundaries of 
> the poly ...
> but If I use $poly2->contains($pt) with pt a point with the same coords that 
> the poly2 it's work fine ...
> 
> An idea, is it a bug or a wrong use ?
> 
> Thanks