[mapserver-users] PPH Mapscript - limit to number of shape objects in a layer?

[Alan Boudreault]

That's what I suspected too. I'm not sure if there is a reason why you 
keep ALL lineObj and shapeObj in arrays... but maybe you could try 
something like this:

$i = 0;
 foreach($qresult as $row) {
     $ln = ms_newLineObj();
 
     $X = $row[1];
     $Y = $row[2];
     $ln->addXY($X-1000,$Y-1000);
     $ln->addXY($X+1000,$Y-1000);
     $ln->addXY($X+1000,$Y+1000);
     $ln->addXY($X-1000,$Y+1000);
     $ln->addXY($X-1000,$Y-1000);
 
     $shp = ms_newShapeObj(MS_SHAPE_POLYGON);
 
     $shp->add($ln);
     $shp->set(index, $row[0]);
 
     $layerPoi->addFeature( $shp );
  $i++;
 }

This will of course reduce the memory usage of your script ... if you 
don't need all those lineObj and shapeObj arrays. (You can always get 
the shapeObjs of the layer again later)

Alan

Alan Hale wrote:
> I've just figured out that this is a PHP memory limit issue - raising 
> the limit in php.ini to 128M from the default 32M fixes the problem.
>
> But can anyone suggest a more memory-efficient way of coding the 
> addition of square polygons to a dynamic layer?
>
> Many thanks
>
> Alan
>
>
>
> Alan Hale wrote:
>> Hi Alan
>>
>> Thanks for the reply. I'm displaying the map image via Overlib and so 
>> not getting any error messages- just no image. I know the limit is 
>> 11528 just by setting LIMIT on the database query and iterating to 
>> the max value. I've been trying to debug the script that generates 
>> the image but this is proving more difficult than I thought since 
>> various parameters are passed via Overlib so I will have to insert 
>> some dummy values.
>>
>> Hope to get back with more information later.
>>
>> Regards
>>
>> Alan
>>
>> Alan Boudreault wrote:
>>> Hi Alan,
>>>
>>> What's happen when you reach 11528? Is is a PHP error or a mapserver 
>>> error ? Could you show us the error?
>>>
>>> Alan
>>>
>>> On October 23, 2009 11:30:00 am Alan Hale wrote:
>>>  
>>>> Hi
>>>>
>>>> I'm using PHP Mapscript to construct a layer with 2km square polygons
>>>> based on coordinates from a database query - thus:
>>>>
>>>>
>>>> $i = 0;
>>>> foreach($qresult as $row) {
>>>>     $ln[$i] = ms_newLineObj();
>>>>
>>>>     $X = $row[1];
>>>>     $Y = $row[2];
>>>>     $ln[$i]->addXY($X-1000,$Y-1000);
>>>>     $ln[$i]->addXY($X+1000,$Y-1000);
>>>>     $ln[$i]->addXY($X+1000,$Y+1000);
>>>>     $ln[$i]->addXY($X-1000,$Y+1000);
>>>>     $ln[$i]->addXY($X-1000,$Y-1000);
>>>>
>>>>     $shp[$i] = ms_newShapeObj(MS_SHAPE_POLYGON);
>>>>
>>>>     $shp[$i]->add($ln[$i]);
>>>>     $shp[$i]->set(index, $row[0]);
>>>>
>>>>     $layerPoi->addFeature( $shp[$i] );
>>>>  $i++;
>>>>
>>>> This seems to work fine UNTIL the query result reaches more than 11528
>>>> rows (this number is exact). Is there a limit? Am I expecting too much
>>>>  here?
>>>>
>>>> Many thanks
>>>>
>>>> Alan Hale
>>>>
>>>>
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>>>
>>>   
>>
>>
>>
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>
>
>
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-- 
Alan Boudreault
Mapgears
http://www.mapgears.com/