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

[Alan Hale]

Alan

Well, I think I just adapted code from Bill Kropla's "Beginning 
Mapserver" (that was for point rather than polygon data). I should have 
given it some more thought.

Your suggestion works fine and will run with a 32M limit.

Very many thanks for your help.

Alan


Alan Boudreault wrote:
> 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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>



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