[mapserver-users] PHP/Mapscript: Creating a "virtual" layer on the fly

[Doyon, Jean-Francois]

Hello ... Me again :)

Now I want to create a lyer to add to a mapfile entirely on the fly, using
point coordinates provided via the url:

if ( isset($HTTP_GET_VARS['lat']) && isset($HTTP_GET_VARS['long']) ) {
        $pointobj = ms_newPointObj();
        $pointobj->setXY($HTTP_GET_VARS['lat'],$HTTP_GET_VARS['long']);
        $projfrom = ms_newprojectionobj('proj=latlong');
        $projto =
ms_newprojectionobj('proj=lcc,ellps=GRS80,lat_0=49n,lon_0=95w,lat_1=49n,lat_
2=77n');
        $pointobj->project($projfrom,$projto);
        $lineobj = ms_newLineObj();
        $lineobj->add($pointobj);  
        $pointobj->free();
        $shapeobj = ms_newShapeObj(MS_SHAPE_POINT);
        $shapeobj->add($lineobj);
        $lineobj->free();
        $layerobj = ms_newLayerObj($map);
        $layerobj->set('type',MS_LAYER_POINT);
        $layerobj->set('status',MS_ON);
        $layerobj->addFeature($shapeobj);
        $classobj = ms_newClassObj($layerobj);
        $classobj->set('symbol',0);
        $classobj->set('size',20); 
        $classobj->set('color','0 0 0');
}

This doesn't draw however ... I don't get errors, I just don't see the
point. a Symbol size 20 should make it visible enough, no ?

I checked the addFeature, and returns 0 (NOT -1), so that works ok ... I
also checked my projection parameters, and see nothing wrong with them.

I checked the layer index and it says 60, which sounds about right, and
means that the new layer WAS created on "top", so that shouldn't be the
problem either ...

Any ideas?

Thanks,

Jean-François Doyon
Internet Service Development and Systems Support
GeoAccess Division
Canadian Center for Remote Sensing
Natural Resources Canada
http://atlas.gc.ca
Phone: (613) 992-4902
Fax: (613) 947-2410