collective.geo.geographer 0.1.2

Geographic annotation for Plone

collective.geo.geographer

Summary

• Introduction

• Requirements

• How it work

• Plone integration

• Contributors

Introduction

collective.geo.geographer provides geo annotation for Plone.

This package is based on Sean Gillies’s idea (zgeo.geographer) and integrates its functionalities in collective.geo project.

Requirements

• simplejson

• geopy

• Plone >= 4

How it work

Any object that implements zope.annotation.interfaces.IAttributeAnnotatable and collective.geo.geographer.interfaces.IGeoreferenceable can be adapted and geo-referenced. The former marker is standard for Zope content objects, and the latter can be easily configured via ZCML.

Let’s test with an example placemark, which provides both of the marker interfaces mentioned above.

>>> from zope.interface import implements
>>> from zope.annotation.interfaces import IAttributeAnnotatable
>>> from collective.geo.geographer.interfaces import IGeoreferenceable

>>> class Placemark(object):
...     implements(IGeoreferenceable, IAttributeAnnotatable)

>>> placemark = Placemark()

Adapt it to IGeoreferenced

>>> from collective.geo.geographer.interfaces import IGeoreferenced
>>> geo = IGeoreferenced(placemark)

Its properties should all be None

>>> geo.type is None
True
>>> geo.coordinates is None
True
>>> geo.crs is None
True

Now set the location geometry to type “Point” and coordinates 105.08 degrees West, 40.59 degrees North using setGeoInterface()

>>> geo.setGeoInterface('Point', (-105.08, 40.59))

A georeferenced object has “type” and “coordinates” attributes which should give us back what we put in.

>>> geo.type
'Point'
>>> geo.coordinates
(-105.08, 40.590000000000003)
>>> geo.crs is None
True

An event should have been sent

>>> from zope.component.eventtesting import getEvents
>>> from collective.geo.geographer.event import IObjectGeoreferencedEvent
>>> events = getEvents(IObjectGeoreferencedEvent)
>>> events[-1].object is placemark
True

Plone integration

Make a topic in our folder

>>> self.setRoles(('Manager',))

>>> folder = self.folder
>>> oid = self.folder.invokeFactory('Topic', 'topic')
>>> topic = self.folder[oid]
>>> c = topic.addCriterion('getGeometry', 'ATBooleanCriterion')

Add geo-referenced content

>>> oid = self.folder.invokeFactory('Document', 'doc')
>>> doc = self.folder[oid]

If content type doesn’t implements IGeoreferenceable interfaces we need to provide it

>>> from zope.interface import alsoProvides
>>> alsoProvides(doc, IGeoreferenceable)

now we can set the coordinates

>>> from collective.geo.geographer.interfaces import IWriteGeoreferenced
>>> geo = IWriteGeoreferenced(doc)
>>> geo.setGeoInterface('Point', (-100, 40))

Check the topic

>>> brain = [b for b in topic.queryCatalog() if b.id == 'doc'][0]
>>> brain.zgeo_geometry['type']
'Point'
>>> brain.zgeo_geometry['coordinates']
(-100, 40)

A simple view notify us if a context is geo referenceable

>>> doc.restrictedTraverse('@@geoview').isGeoreferenceable()
True

>>> topic.restrictedTraverse('@@geoview').isGeoreferenceable()
False

Contributors

• Sean Gillies

• Giorgio Borelli

Changelog

0.1.2 (2010-12-28)

• Moved IGeoView from c.geo.contentlocations

0.1.1 (2010-11-13)

• moved geocoderview to portal root

0.1 (2010-10-31)

• removed zgeo.geographer dependency

• zgeo.plone.geographer code refactoring

• moved from zgeo.plone.geographer