[mapserver-users] queryUsingPoint seg fault on demo maps

[Jim Burnett]

I figured it out, I had to make some changes in my map file, and also set my
default map extents!!
thanks!!

-jim
----- Original Message -----
From: "Daniel Morissette" <morissette at dmsolutions.ca>
To: "Jim Burnett" <jimburnett at ntelos.net>
Cc: <mapserver-users at lists.gis.umn.edu>
Sent: Wednesday, August 08, 2001 12:55 PM
Subject: Re: [mapserver-users] queryUsingPoint seg fault on demo maps


> Jim Burnett wrote:
> >
> > OK, Now I downgraded to php-4.0.5 also.
>
> Going back to PHP 4.0.5 was not necessary since you're using Mapscript
> 3.5... the message you get is not a bug... it's a normal error message
> saying that nothing was found.
>
>
> > I still get
> > Warning: MapServer Error in msQueryByPoint(): No matching record(s)
found.
> > in /drives/storage1/homes/htdocs/maptest/php/test.php on line 71
> >
> > I can not seem to pull any data from the ms_demo data files.
> > Here is my code and map file.
> >
> > Zooming, and Panning work fine, just cant query for some reason. What am
I
> > missing?
> >
> > $mapObj = ms_newMapObj("/home/htdocs/maptest/romney.map");
> >  $ptClicked = ms_newPointObj();
> >  $ptClicked->setXY($x,$y);
> >  $queryObj = $mapObj->queryByPoint( $ptClicked,MS_MULTIPLE,-1 );
> >
>
> Are $x and $y in pixel coordinates?
>
> The query functions expect the search location in map coordinates...
> here's an example of code that should (hopefully ;) convert from pixel
> to map coordinates:
>
>  $pix_x = ...; // click location in pixel units
>  $pix_y = ...;
>  $mapext = $mapObj->extent;
>  $w = $mapObj->width;
>  $h = $mapObj->height;
>  $georef_x = $mapext->minx + ($pix_x/$w)*($mapext->maxx-$mapext->minx);
>  $georef_y = $mapext->maxy - ($pix_y/$h)*($mapext->maxy-$mapext->miny);
>
> --
> ------------------------------------------------------------
>  Daniel Morissette               morissette at dmsolutions.ca
>  DM Solutions Group              http://www.dmsolutions.ca/
> ------------------------------------------------------------
>   Don't put for tomorrow what you can do today, because if
>       you enjoy it today you can do it again tomorrow.
>
>