[mapserver-users] buffer bounds (PHP Mapscript)

[Armin Burger]

Carlo

I don't know if this behaviour is a feature or a bug of PHP Mapscript (I 
have not tested it with SWIG versions of Mapscript). A workaround is to 
project the buffer in the same projection as the layer. Then the extent 
is returned correctly. Something like

$prj =  ms_newprojectionobj($queryLayer->getProjection());
$buffer_polygon=$selected_shape->buffer($buffer_width);
$buffer_polygon->project($prj, $prj);
$shapebounds=$buffer_polygon->bounds;

Armin

On 11/04/2008 14:20, Carlo Pelliconi wrote:
> Hi.
> I'm trying to obtain automatic zoom on a buffer (which I want to see in 
> map - and I do that) created around a selected feature.
> I use
> 
> $selected_shape=$queryLayer->getShape(...);
> $buffer_polygon=$selected_shape->buffer($buffer_width);
> $shapebounds=$buffer_polygon->bounds;
> 
> This doesn't work: $buffer_shapebounds (which is a rectobj) is set to -1 
> -1 -1 -1 and used in setExtent it doesn't work.
> If I apply the same code to a "real" shapefile (eg. the result of a 
> getShape, without the buffer around), it works:
> 
> $selected_shape=$queryLayer->getShape(...);
> $shapebounds=$selected_shape->bounds;
> 
> In this case $shapebounds is well defined and used in setExtent it works.
> 
> Any idea or suggestion?
> Thanks in advance
>