[Gvsig_english] How to access schema from an input shapefile in scripting
Silvia Franceschi
silvia.franceschi at gmail.com
Fri Oct 14 15:33:06 CEST 2016
Hi Óscar,
always me.. :-)
is there also a way to write a layer in a shapefile directly from a script
or do I have to load it in gvSIG and save it from there?
Thanks
Silvia
On Fri, Oct 14, 2016 at 1:54 PM, Silvia Franceschi <
silvia.franceschi at gmail.com> wrote:
> Thank you Óscar for your detailed explanation and your help!
>
> Silvia
>
> On Fri, Oct 14, 2016 at 11:59 AM, Óscar Martínez <omartinez at gvsig.com>
> wrote:
>
>> Reading again your email maybe this also answer your question:
>>
>> Inside the script you can make a: print dir(layer) and it will show you
>> the avalaible functions of that type of object.
>>
>> El 14/10/16 a las 11:26, Óscar Martínez escribió:
>>
>> Hi Silvia,
>>
>>
>> | Is there a way to know which functions are implemented for each
>> feature type in gvSIG scripting?
>>
>> If i understand correctly your question.. Quick answer, all. Since 2.3,
>> we are not working with a different library for scripting. We improved the
>> way to work directly with the JAVA API, plus new functions (like..
>> createShape(schema)), methods (like.. getValues() over a feature to return
>> a python dict) and new classes (like.. FormPanel to create scripts with
>> graphical interface), all to make it easy and quick to work from scripting.
>> Not sure if is a good way to say it (just to explain this better), but we
>> could say right now is the java api who hasn't have all the funcions
>> implemented.
>>
>> As you can see in the script, type(layer) and type(features) are java
>> objects.
>>
>> Running script.
>> layer type: <type 'org.gvsig.fmap.mapcontext.layers.vectorial.FLyrVect'>
>> layer features: <type 'org.gvsig.fmap.dal.feature.im
>> pl.featureset.DefaultFeatureSet'>
>> Script terminated.
>>
>> So, you should be able to check the javadocs, and use all the functions
>> that are in there:
>>
>> http://downloads.gvsig.org/download/gvsig-desktop-testing/
>> dists/2.3.0/javadocs/html/
>>
>> http://downloads.gvsig.org/download/gvsig-desktop-testing/
>> dists/2.3.0/javadocs/html/org/gvsig/fmap/mapcontext/layers/
>> vectorial/FLyrVect.html
>>
>> http://downloads.gvsig.org/download/gvsig-desktop-testing/
>> dists/2.3.0/javadocs/html/org/gvsig/fmap/dal/feature/impl/
>> featureset/DefaultFeatureSet.html
>>
>>
>> Plus all from scripting (we are updating this javadoc, soon will be more
>> complete):
>>
>> http://downloads.gvsig.org/download/gvsig-desktop-testing/
>> dists/2.3.0/docs/javadocs/html/
>>
>>
>> Deleting features should be something similar to this (delete all
>> features with a filter "ID < 10"):
>> # encoding: utf-8
>>
>> from gvsig import *
>>
>> def main(*args):
>> """ Delete features inside a layer"""
>>
>> layer = currentLayer()
>> features = layer.features("ID < 10") #DefaultFeatureSet
>>
>>
>> print "layer type: ", type(layer)
>> print "layer features: ", type(features)
>>
>> layer.edit()
>>
>> for i in features:
>> ivalues = i.getValues()
>> print ivalues
>> features.delete(i)#delete over the featureset
>>
>> layer.commit()
>>
>>
>> Best regards,
>> Óscar
>>
>>
>> El 14/10/16 a las 10:53, Silvia Franceschi escribió:
>>
>> Hi Óscar,
>> the scripts work fine, many thanks again!
>> May I just ask you one more question?
>> Is there the possibility to remove a feature from a list of features?
>> like featureslist.remove() or something like that?
>> I tried with remove and delete but it seems that these do not exist, any
>> idea?
>>
>> Is there a way to know which functions are implemented for each feature
>> type in gvSIG scripting?
>>
>> Thanks
>>
>> Silvia
>>
>>
>> On Thu, Oct 13, 2016 at 6:25 PM, Silvia Franceschi <
>> silvia.franceschi at gmail.com> wrote:
>>
>>> Thank you Óscar,
>>> to tell you the truth I started to use currentLayer but, since I need to
>>> work with two layers I didn't know how to do and tried to load data from
>>> files.
>>> And in any case the final script should work with a list of shapefiles
>>> in a folder, so, I will for sure move to the file based data source at some
>>> point.
>>>
>>> I was following the documentation you linked, it is very useful to start
>>> to get familiar with the scripting environment, thanks!
>>>
>>> I will try the scripts you sent to me and let you know if I will solve
>>> my problems.
>>>
>>> Thank you very much for the quick answer!
>>>
>>> Silvia
>>>
>>>
>>>
>>>
>>> On Thu, Oct 13, 2016 at 6:00 PM, Óscar Martínez <omartinez at gvsig.com>
>>> wrote:
>>>
>>>> Hi!
>>>>
>>>> If i understood correctly, you don't need to use the getSchema
>>>> function. I'm going to give you my solution with two test layers, give it a
>>>> try and tell us if that works for you or what exactly more do you need. If
>>>> you don't understand some part of the script i can explain it better. Some
>>>> help is inside the script, step by step.
>>>>
>>>> I recommend to you to start learning scripting using the functions
>>>> currentLayer() (current layer selection in the table of contents) or
>>>> currentView().getLayer("layername") instead of using loadShapeFile
>>>> everytime. It's easier if you just have a loaded layer in your view and
>>>> access to each one each layer with currentLayer o getLayer.
>>>>
>>>> If someone on the list want to know more about this part of scripting,
>>>> here are some links from the spanish docs (hope soon in english) related to
>>>> this post:
>>>>
>>>> Access to features: http://downloads.gvsig.org/dow
>>>> nload/web/html/es/scripting_devel_guide/2.3/acceso_a_objetos
>>>> .html#entidad
>>>>
>>>> Spatial operations: http://downloads.gvsig.org/dow
>>>> nload/web/html/es/scripting_devel_guide/2.3/modulo_geom.html
>>>> #operaciones-espaciales
>>>>
>>>> Current functions: http://downloads.gvsig.org/dow
>>>> nload/web/html/es/scripting_devel_guide/2.3/acceso_a_objetos.html
>>>>
>>>>
>>>> Any trouble here we are!
>>>>
>>>>
>>>> Best regards,
>>>>
>>>> Óscar
>>>>
>>>>
>>>>
>>>> Script (layers of this test are in EPSG:25830) (feature AREA1 is a
>>>> multipolygon):
>>>>
>>>> # encoding: utf-8
>>>>
>>>> import gvsig
>>>>
>>>> def main(*args):
>>>> # You need to have one view with to layers opened on it
>>>> # The name of the layers will be the name that appear
>>>> # in the table of contents of the view
>>>>
>>>> # To access to the layers that are already loaded in gvSIG
>>>> # gvsig.currentView() give us access to the opened view
>>>> # gvsig.currentView().getLayer(name) give us access a specified
>>>> layer
>>>> points = gvsig.currentView().getLayer("points")
>>>> area = gvsig.currentView().getLayer("area")
>>>>
>>>> # Access to the features
>>>> features_points = points.features()
>>>> features_area = area.features()
>>>>
>>>> # if you want access to a selection of features, not all
>>>> # you will have to change `features()` with `getSelection()`
>>>> #features_points = points.getSelection()
>>>> #features_area = area.getSelection()
>>>>
>>>> for farea in features_area:
>>>> print "\nChecking : ", farea.get("localId")
>>>> geom_farea = farea.geometry()
>>>>
>>>> #for each area, check all points without intersection
>>>> for fpoint in features_points:
>>>> geom_fpoint = fpoint.geometry()
>>>>
>>>> if not geom_farea.intersects(geom_fpoint):
>>>> print "\tArea: ", farea.get("localId"), " intersects
>>>> with :", fpoint.get("ID")
>>>> # work with the feature
>>>>
>>>> Console output:
>>>>
>>>> Running script testing_silvia_intersec.
>>>>
>>>> Checking : AREA1
>>>> Area: AREA1 intersects with : 101
>>>> Area: AREA1 intersects with : 102
>>>> Area: AREA1 intersects with : 103
>>>> Area: AREA1 intersects with : 107
>>>>
>>>> Checking : AREA2
>>>> Area: AREA2 intersects with : 103
>>>> Area: AREA2 intersects with : 104
>>>> Area: AREA2 intersects with : 105
>>>> Area: AREA2 intersects with : 106
>>>> Area: AREA2 intersects with : 107
>>>> Area: AREA2 intersects with : 108
>>>> Script testing_silvia_intersec terminated.
>>>>
>>>>
>>>>
>>>> El 13/10/16 a las 15:05, Silvia Franceschi escribió:
>>>>
>>>> Hi all,
>>>> I am trying to write my first script in gvSIG and Python, I need to
>>>> read a point shapefile and filter some elements that are outside a defined
>>>> area.
>>>> To do this I have to read two input layers, one with the points and one
>>>> with the area and then work on each single features of the point layer.
>>>> I started with the selection of the input layers using a filechooser
>>>> dialog (commonsdialog.filechooser) and then I need to obtain the schema of
>>>> these layers, but it seems that the object filechooser do not have the
>>>> .getSchema() function.
>>>> Do you have any idea on how to obtain the schema from a vector layer
>>>> selected using the filechooser?
>>>>
>>>> Thanks in advance for any help!
>>>>
>>>> Silvia
>>>>
>>>>
>>>> --
>>>> ing. Silvia Franceschi
>>>> Via Latemar, 22
>>>> 38030 Castello di Fiemme (TN)
>>>>
>>>> tel: 0039 -3384501332 <0039%20-3384501332>
>>>>
>>>>
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>>>
>>> --
>>> ing. Silvia Franceschi Via Latemar, 22
>>> 38030 Castello di Fiemme (TN) tel: 0039 -3384501332
>>>
>> --
>> ing. Silvia Franceschi Via Latemar, 22
>> 38030 Castello di Fiemme (TN) tel: 0039 -3384501332
>>
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>> Gvsig_internacional mailing listGvsig_internacional at listserv.gva.es
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>
>
> --
> ing. Silvia Franceschi
> Via Latemar, 22
> 38030 Castello di Fiemme (TN)
>
> tel: 0039 -3384501332
>
--
ing. Silvia Franceschi
Via Latemar, 22
38030 Castello di Fiemme (TN)
tel: 0039 -3384501332
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