[Chameleon] Querying dynamic built layers

[David Dabney]

Could this be as simple as increasing the tolerance for that layer? 

Ken Sanderson wrote:

> Yes, here is the phpmapscript chunk of my script.
>
> Ken
>
>                 $poLayer = ms_newLayerObj($this->moMapSession->oMap);
>                 $poLayer->set("name", "Your Point Summary");
>                 $poLayer->set("status", MS_OFF);
>                 $poLayer->set("type", MS_LAYER_POINT);
>                 $poLayer->set("labelcache", MS_OFF);
>                 $poLayer->set("labelmaxscale",30000.0);
>                 $poLayer->set("labelminscale",1.0);
>                 $poLayer->set("template","ttt_query.html");
>                 $poClass = ms_newClassObj($poLayer);
>                 $poClass->set("name", "dynamic point summary class");
>                 $poClass->label->set("font","sans");
>                 $poClass->label->set("type","truetype");
>                 $poClass->label->set("size",7);
>                 $poClass->label->set("position","auto");
>                 $poClass->label->set("force","TRUE");
>                 $poClass->label->color->setRGB(0,0,0);
>                 $poClass->label->outlinecolor->setRGB(225,240,180);
>                 $poClass->label->shadowcolor->setRGB(225,240,180);
>                 $poClass->label->set("offsetx",1);
>                 $poClass->label->set("offsety",1);
>                 $poClass->label->set("buffer",10);
>                 $poClass->set("template","ttt_query.html");
>                 $poStyle = ms_newStyleObj($poClass);
>                 $poStyle->set("symbolname","star");
>                 $poStyle->set("size", 15);
>                 $poStyle->color->setRGB(250, 160, 5);
>                 $poStyle->outlinecolor->setRGB(0,0,0);
>
>                 //go through point array and use each item
>                 for ($i=0;$i<count($pointsarray);$i++){
>                   $pt = ms_newPointObj();
>                   $ln = ms_newLineObj();
>                   $shp = ms_newShapeObj(MS_SHAPE_POINT);
>                   $pt->setXY($pointsarray[$i][2],$pointsarray[$i][3]);
>                   $ln->add($pt);
>                   $shp->add($ln);
>                   $shp->set("text",$pointsarray[$i][1]);
>                   $shp->set("index",$i);
>                   $poLayer->addFeature($shp);
>                 }
>
> Eric Bridger wrote:
>
>> Are you calling $layer->addFeature() as well?
>>
>>
>> On Wed, 2005-03-16 at 14:40, Ken Sanderson wrote:
>>
>>> Thanks Eric for the reply.
>>>
>>> I am not sure I understand the issue with chameleon. I added the 
>>> layer to the session map object so that it would remain between map 
>>> draws, basically for the life of the session. How would this 
>>> conflict with the query attempt?
>>>
>>> Basically I have done the equiv of the perl script you have linked, 
>>> only I did it with PHP mapscript, now possible thanks to them making 
>>> index a write-able property for php mapscript.
>>>
>>> So I have a layer loaded to the map, I have points being displayed, 
>>> with  appropriate labels, I just cant use the query widget on that 
>>> layer, or rather it always returns 0 records.
>>>
>>> Ken
>>>
>>> Eric Bridger wrote:
>>>
>>>> There is a work around that I have used for this type of thing using
>>>> mapscript (Perl). I call $point->draw() and then create a single point
>>>> line shape from that point (setting the $shape->index to my numeric 
>>>> key
>>>> value and call $layer-addFeature($shape).  This adds the point as a
>>>> feature to the layer and it is queryable and should return the 
>>>> index you
>>>> used. There is a Perl example of this here:
>>>> http://mapserver.gis.umn.edu/cgi-bin/wiki.pl?PerlMapScriptExamples42ex1 
>>>>
>>>>
>>>>
>>>> BUT there is a problem with this approach when using Chameleon.  In
>>>> Chameleon the map object is cached in your session and I've found that
>>>> all features added to the map are retained between map draws.
>>>>
>>>> You might be able to get around this by calling $map->removeLayer() 
>>>> but
>>>> I have not tested this.
>>>>
>>>>
>>>> On Wed, 2005-03-16 at 13:05, Ken Sanderson wrote:
>>>>
>>>>
>>>>> Hello all.
>>>>>
>>>>> I have setup a script that queries a database and retrieves a 
>>>>> bunch of points. I then create a layer object that I added to the 
>>>>> map object for these points. Each of these points shows up on the 
>>>>> map, each has a label, and I have used the new change to the index 
>>>>> property to add an index value for each point, sequentially. All 
>>>>> works, no errors.
>>>>>
>>>>> I 'thought' that I could just add the template value and then this 
>>>>> layer would be queryable using the query tool. Obviously it will 
>>>>> not return any data other than the shape_index and other inherient 
>>>>> values, but for now thats all I wanted to check.
>>>>>
>>>>> However this is not the case. The query returns the layer in the 
>>>>> list of layers that didnt return results, but never returns any 
>>>>> values.
>>>>>
>>>>> Any ideas why this is?
>>>>>
>>>>
>>>>
>>>> _______________________________________________
>>>> Chameleon mailing list
>>>> Chameleon at lists.maptools.org
>>>> http://lists.maptools.org/mailman/listinfo/chameleon
>>>>
>>>
>>
>>
>> _______________________________________________
>> Chameleon mailing list
>> Chameleon at lists.maptools.org
>> http://lists.maptools.org/mailman/listinfo/chameleon
>>
>
> _______________________________________________
> Chameleon mailing list
> Chameleon at lists.maptools.org
> http://lists.maptools.org/mailman/listinfo/chameleon
>

-- 
~~~~~~~~~~~~~~~~~~~~~~~
David Dabney
NOAA Hollings Marine Lab/JHT
331 Fort Johnson Rd
Charleston, SC 29412
843.762.8984
david.dabney at noaa.gov