[Mapserver-users] unclear on the concept

[Joel Gwynn]

I'm just going by this, from 
http://mapserver.gis.umn.edu/doc35/perlmapscript-reference.html:
*_shapeObj:_* 
<http://mapserver.gis.umn.edu/doc35/perlmapscript-reference.html#toc>

*Constructor:*
	new shapeObj(type)


*Examples:* 	$shape = new shapeObj(-1);

	The type parameter is just a general type used to make MapScript less 
bulky.
With it MapScript can make decisions in a few comparison methods without 
requiring specific methods.
Valid values are -1, MS_SHAPE_POINT, MS_SHAPE_LINE, & MS_SHAPE_POLYGON.
Other shape creation methods (see shapefileObj) 
<http://mapserver.gis.umn.edu/doc35/perlmapscript-reference.html#shapefileobj> 
populate this parameter correctly.


So I interpreted that to mean that a shapeObj could hold points, lines, 
or polygons.  "print $point->{x}" definitely returns nothing, though.

Lowell Filak wrote:

>I realize that. The $shape->get returns a line object not point. It's
>easy enough to verify, does "print $point->{x}.' '.$point->{y}" print a
>real x & y or 0?
>
>Lowell
>
>The following message was sent by Joel Gwynn <joelman at joelman.com> on
>Fri, 23 Jul 2004 09:56:44 -0400.
>
>  
>
>>it's a point layer
>>
>>Lowell Filak wrote:
>>
>>    
>>
>>>Doesn't $so need to be MS_SHAPE_LINE instead of MS_SHAPE_POINT ?
>>>
>>>Lowell
>>>
>>>The following message was sent by Joel Gwynn <joelman at joelman.com> on
>>>Fri, 23 Jul 2004 00:26:20 -0400.
>>>
>>> 
>>>
>>>      
>>>
>>>>The shapeindex numbers I'm getting don't seem to correspond to any 
>>>>values in my "cities" table.  Even so, I would hope that I could 
>>>>retrieve all the feature info from the mapserver object without opening 
>>>>up a separate database connection.  Is this not so?
>>>>
>>>>I'm just having trouble finding the specific syntax to get information 
>>>>about individual points on a point layer.  Here's what I would think 
>>>>might work, but of course it's not.
>>>>
>>>>   my $so = new mapscript::shapeObj($mapscript::MS_SHAPE_POINT);
>>>>   ...
>>>>if(my $r = $city_layer->queryByPoint($map, $boston, 
>>>>$mapscript::MS_MULTIPLE,10)){
>>>>   print "no results.\n";
>>>>}else{
>>>>   my $i = 0;
>>>>   print "status: $r\n";
>>>>   while(my $rc = $city_layer->getResult($i)){
>>>>   my $si = $rc->{shapeindex};
>>>>   $r = $city_layer->getShape($so, 0, $si);
>>>>   print "getShape: $r\n";
>>>>   my $point = new mapscript::pointObj();
>>>>   $point = $so->get(0);
>>>>   print $point->{x}.' '.$point->{y}
>>>>}
>>>>
>>>>What really obvious syntax am I missing?
>>>>
>>>>Thanks,
>>>>Joel
>>>>
>>>>Lowell Filak wrote:
>>>>
>>>>   
>>>>
>>>>        
>>>>
>>>>>I don't know postgis but I would suspect that the query you want to do
>>>>>could be done directly in postgis.
>>>>>Excluding that as a possibility, the shapeindexes you receive back
>>>>>should be the sequential number of the shape/attribute record as they
>>>>>occur in the postgres table. You should be able to retrieve the shape
>>>>>into a shapeObj via $layer->getShape($shape, 0, $si).
>>>>>
>>>>>HTH
>>>>>
>>>>>Lowell
>>>>>
>>>>>The following message was sent by Joel Gwynn <joelman at joelman.com> on
>>>>>Wed, 21 Jul 2004 23:43:20 -0400.
>>>>>
>>>>>
>>>>>
>>>>>     
>>>>>
>>>>>          
>>>>>
>>>>>>Perhaps I'm going about this the wrong way.  I'm using perl
>>>>>>            
>>>>>>
>mapscript, 
>  
>
>>>>>>and I've got a postgis points layer and I want to get some points,
>>>>>>            
>>>>>>
>say 
>  
>
>>>>>>within a certain radius of Boston:
>>>>>>
>>>>>>my $map = new mapscript::mapObj("$map_path/world_cities.map");
>>>>>>my $boston = new mapscript::pointObj(-71.1029968261719, 42.375);
>>>>>>my $city_layer = $map->getLayer(1);
>>>>>>
>>>>>>if(my $r = $city_layer->queryByPoint($map, $boston, 
>>>>>>$mapscript::MS_MULTIPLE,10)){
>>>>>>  print "no results.\n";
>>>>>>}else{
>>>>>>  my $i = 0;
>>>>>>  print "status: $r\n";
>>>>>>  while(my $rc = $city_layer->getResult($i)){
>>>>>>  my $si = $rc->{shapeindex};
>>>>>>  print "shapeindex: $si\n";
>>>>>>  $i++;
>>>>>>  }
>>>>>>}
>>>>>>
>>>>>>This prints out a bunch of shapeindex numbers.  What are those
>>>>>>            
>>>>>>
>numbers? 
>  
>
>>>>>>They don't seem to show up in my cities table in the database.  Can I 
>>>>>>use the mapscript object to access the points?
>>>>>>_______________________________________________
>>>>>>Mapserver-users mailing list
>>>>>>Mapserver-users at lists.gis.umn.edu
>>>>>>http://lists.gis.umn.edu/mailman/listinfo/mapserver-users
>>>>>>  
>>>>>>
>>>>>>       
>>>>>>
>>>>>>            
>>>>>>
>>>>>     
>>>>>
>>>>>          
>>>>>
>>> 
>>>
>>>      
>>>
>>_______________________________________________
>>Mapserver-users mailing list
>>Mapserver-users at lists.gis.umn.edu
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>>    
>>
>
>
>  
>