[Gvsig_english] SUGGESTED FUNCTIONALITY gvSIG 1.9 (BN 1253) -- Permanent Filter Shapefiles

Sat Jan 9 10:54:57 CET 2010

The "Expression" type symbology is meant to actually filter
out all those features that are not matched by any expression.
They are not transparent, but actually "switched off".

Whether that means they should also be invisible to the information
tool/table view is a matter of debate. Personally, I would prefer
them to be filtered out totally, i.e. not appear in an attribute
table view either..

Whereas if you use any of the other filters, you may be able to
set the drawing style so they appear to be invisible, they actually
still are there as part of the layer.

Ben

Simon Cropper (Botanicus Australia Pty Ltd) wrote:
> Ben,
> 
> You would have noted in my flotilla of emails that I hit a range of 
> problems, some specifically related to joined tables.
> 
> I circumvented this by using the "import fields" option and basically 
> sucked the needed fields into my existing shapefile. As all my data in 
> and out of gvSIG have primary keys it was relatively easy once I found 
> the tool gvSIG uses.
> 
> In regards to the 'expression' filter it only slightly varies from the 
> 'Unique Values' option. It appears to allow you to have more complex 
> conditions rather than just those unique values expressed in the field. 
> Curiously it does seem to behave differently when using the select tool. 
> A 'transparent' polygon in the 'expression' filter option can be seen 
> with the 'information' tool but not selected, while the 'transparent' 
> polygon in the 'unique values' option can be seen by the 'information' 
> tool and can be selected. Not sure if this is by design or not.
> 
> As I indicated to Antonio, I think that when applying a filter to a 
> shapefile all geometries and their associated attributes, labeling, etc 
> should be invisible to the system. Although I don't really no the 
> nuances of the system, I presume this could be achieved by modifying the 
> "gvSIG shp driver", which I presume sits between the core system and all 
> the various extensions.
> 
> Cheers Simon
> 
> Simon Cropper
> Botanicus Australia Pty Ltd
> PO Box 160, Sunshine, Victoria 3020.
> P: 9311 5822. M: 041 830 3437.
> mailto: scropper at botanicusaustralia.com.au 
> <mailto:scropper at botanicusaustralia.com.au>
> web: www.botanicusaustralia.com.au <http://www.botanicusaustralia.com.au>
> 
> 
> On 8/01/2010 9:27 PM, Benjamin Ducke wrote:
>> Last time I checked, the "Expression" type filter you mention
>> below did not work on fields joined from an external table.
>> I think this is the problem that Simon ran into.
>>
>> Ben
>>
>> ----- Original Message -----
>> From: "Antonio Falciano"<afalciano at yahoo.it>
>> To: "Users and Developers mailing list"<gvsig_internacional at listserv.gva.es>
>> Sent: Friday, January 8, 2010 11:21:29 AM GMT +01:00 Amsterdam / Berlin / Bern / Rome / Stockholm / Vienna
>> Subject: Re: [Gvsig_english] SUGGESTED FUNCTIONALITY gvSIG 1.9 (BN 1253) -- Permanent Filter Shapefiles
>>
>> Il 08/01/2010 8.02, Simon Cropper (Botanicus Australia Pty Ltd) ha scritto:
>>    
>>> Hi,
>>>
>>> I was a little surprised not to find the ability to apply a
>>> permanent filter to a shapefile based on the attributes in a table.
>>> Say for example you wished only to show the polygons of a particular
>>>   vegetation type. At present, this appears only way to do this is
>>> exporting those geometries to a new file.
>>>      
>> Simon,
>> there's actually the possibility to define a quite close "definition query":
>> Layer Properties -->  Simbology tab -->  Categories tree -->  Expressions
>> option -->  click on New expression of filter -->  ...and so on
>> The only missing feature is that the filter is not applied to the table
>> of attributes. Hope this helps!
>>
>> Cheers,
>> Antonio
>>
>>    
> _______________________________________________
> Gvsig_internacional mailing list
> Gvsig_internacional at listserv.gva.es
> http://listserv.gva.es/cgi-bin/mailman/listinfo/gvsig_internacional
> 

-- 
Benjamin Ducke
Geospatial Consultant

Oxford Archaeology Digital
Janus House
Osney Mead
OX2 0ES
Oxford, U.K.

Tel: +44 (0)1865 263 800 (switchboard)
Tel: +44 (0)1865 980 758 (direct)
Fax :+44 (0)1865 793 496
benjamin.ducke at oadigital.net
http://oadigital.net

----- Original Message -----
From: "Simon Cropper (Botanicus Australia Pty Ltd)" <scropper at botanicusaustralia.com.au>
To: "Users and Developers mailing list" <gvsig_internacional at listserv.gva.es>
Sent: Saturday, January 9, 2010 3:55:39 AM GMT +01:00 Amsterdam / Berlin / Bern / Rome / Stockholm / Vienna
Subject: Re: [Gvsig_english] SUGGESTED FUNCTIONALITY gvSIG 1.9 (BN 1253) -- Permanent Filter Shapefiles

Ben,

You would have noted in my flotilla of emails that I hit a range of 
problems, some specifically related to joined tables.

I circumvented this by using the "import fields" option and basically 
sucked the needed fields into my existing shapefile. As all my data in 
and out of gvSIG have primary keys it was relatively easy once I found 
the tool gvSIG uses.

In regards to the 'expression' filter it only slightly varies from the 
'Unique Values' option. It appears to allow you to have more complex 
conditions rather than just those unique values expressed in the field. 
Curiously it does seem to behave differently when using the select tool. 
A 'transparent' polygon in the 'expression' filter option can be seen 
with the 'information' tool but not selected, while the 'transparent' 
polygon in the 'unique values' option can be seen by the 'information' 
tool and can be selected. Not sure if this is by design or not.

As I indicated to Antonio, I think that when applying a filter to a 
shapefile all geometries and their associated attributes, labeling, etc 
should be invisible to the system. Although I don't really no the 
nuances of the system, I presume this could be achieved by modifying the 
"gvSIG shp driver", which I presume sits between the core system and all 
the various extensions.

Cheers Simon

Simon Cropper
Botanicus Australia Pty Ltd
PO Box 160, Sunshine, Victoria 3020.
P: 9311 5822. M: 041 830 3437.
mailto: scropper at botanicusaustralia.com.au 
<mailto:scropper at botanicusaustralia.com.au>
web: www.botanicusaustralia.com.au <http://www.botanicusaustralia.com.au>

On 8/01/2010 9:27 PM, Benjamin Ducke wrote:
> Last time I checked, the "Expression" type filter you mention
> below did not work on fields joined from an external table.
> I think this is the problem that Simon ran into.
>
> Ben
>
> ----- Original Message -----
> From: "Antonio Falciano"<afalciano at yahoo.it>
> To: "Users and Developers mailing list"<gvsig_internacional at listserv.gva.es>
> Sent: Friday, January 8, 2010 11:21:29 AM GMT +01:00 Amsterdam / Berlin / Bern / Rome / Stockholm / Vienna
> Subject: Re: [Gvsig_english] SUGGESTED FUNCTIONALITY gvSIG 1.9 (BN 1253) -- Permanent Filter Shapefiles
>
> Il 08/01/2010 8.02, Simon Cropper (Botanicus Australia Pty Ltd) ha scritto:
>    
>> Hi,
>>
>> I was a little surprised not to find the ability to apply a
>> permanent filter to a shapefile based on the attributes in a table.
>> Say for example you wished only to show the polygons of a particular
>>   vegetation type. At present, this appears only way to do this is
>> exporting those geometries to a new file.
>>      
> Simon,
> there's actually the possibility to define a quite close "definition query":
> Layer Properties -->  Simbology tab -->  Categories tree -->  Expressions
> option -->  click on New expression of filter -->  ...and so on
> The only missing feature is that the filter is not applied to the table
> of attributes. Hope this helps!
>
> Cheers,
> Antonio
>
>    
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