from django.conf import settings
from django.contrib.gis import geos
from django.template.loader import render_to_string
from django.utils.safestring import mark_safe
class GoogleMapException(Exception): pass
from django.contrib.gis.maps.google.overlays import GPolygon,GPolyline,GMarker,GIcon
# The default Google Maps URL (for the API javascript)
# TODO: Internationalize for Japan, UK, etc.
GOOGLE_MAPS_URL='http://maps.google.com/maps?file=api&v=%s&key='
class GoogleMap(object):
"A class for generating Google Maps JavaScript."
# String constants
onunload = mark_safe('onunload="GUnload()"') # Cleans up after Google Maps
vml_css = mark_safe('v\:* {behavior:url(#default#VML);}') # CSS for IE VML
xmlns = mark_safe('xmlns:v="urn:schemas-microsoft-com:vml"') # XML Namespace (for IE VML).
def __init__(self, key=None, api_url=None, version=None,
center=None, zoom=None, dom_id='map',
kml_urls=[], polylines=None, polygons=None, markers=None,
template='gis/google/google-map.js',
js_module='geodjango',
extra_context={}):
# The Google Maps API Key defined in the settings will be used
# if not passed in as a parameter. The use of an API key is
# _required_.
if not key:
try:
self.key = settings.GOOGLE_MAPS_API_KEY
except AttributeError:
raise GoogleMapException('Google Maps API Key not found (try adding GOOGLE_MAPS_API_KEY to your settings).')
else:
self.key = key
# Getting the Google Maps API version, defaults to using the latest ("2.x"),
# this is not necessarily the most stable.
if not version:
self.version = getattr(settings, 'GOOGLE_MAPS_API_VERSION', '2.x')
else:
self.version = version
# Can specify the API URL in the `api_url` keyword.
if not api_url:
self.api_url = mark_safe(getattr(settings, 'GOOGLE_MAPS_URL', GOOGLE_MAPS_URL) % self.version)
else:
self.api_url = api_url
# Setting the DOM id of the map, the load function, the JavaScript
# template, and the KML URLs array.
self.dom_id = dom_id
self.extra_context = extra_context
self.js_module = js_module
self.template = template
self.kml_urls = kml_urls
# Does the user want any GMarker, GPolygon, and/or GPolyline overlays?
overlay_info = [[GMarker, markers, 'markers'],
[GPolygon, polygons, 'polygons'],
[GPolyline, polylines, 'polylines']]
for overlay_class, overlay_list, varname in overlay_info:
setattr(self, varname, [])
if overlay_list:
for overlay in overlay_list:
if isinstance(overlay, overlay_class):
getattr(self, varname).append(overlay)
else:
getattr(self, varname).append(overlay_class(overlay))
# If GMarker, GPolygons, and/or GPolylines are used the zoom will be
# automatically calculated via the Google Maps API. If both a zoom
# level and a center coordinate are provided with polygons/polylines,
# no automatic determination will occur.
self.calc_zoom = False
if self.polygons or self.polylines or self.markers:
if center is None or zoom is None:
self.calc_zoom = True
# Defaults for the zoom level and center coordinates if the zoom
# is not automatically calculated.
if zoom is None: zoom = 4
self.zoom = zoom
if center is None: center = (0, 0)
self.center = center
def render(self):
"""
Generates the JavaScript necessary for displaying this Google Map.
"""
params = {'calc_zoom' : self.calc_zoom,
'center' : self.center,
'dom_id' : self.dom_id,
'js_module' : self.js_module,
'kml_urls' : self.kml_urls,
'zoom' : self.zoom,
'polygons' : self.polygons,
'polylines' : self.polylines,
'icons': self.icons,
'markers' : self.markers,
}
params.update(self.extra_context)
return render_to_string(self.template, params)
@property
def body(self):
"Returns HTML body tag for loading and unloading Google Maps javascript."
return mark_safe('<body %s %s>' % (self.onload, self.onunload))
@property
def onload(self):
"Returns the `onload` HTML <body> attribute."
return mark_safe('onload="%s.%s_load()"' % (self.js_module, self.dom_id))
@property
def api_script(self):
"Returns the <script> tag for the Google Maps API javascript."
return mark_safe('<script src="%s%s" type="text/javascript"></script>' % (self.api_url, self.key))
@property
def js(self):
"Returns only the generated Google Maps JavaScript (no <script> tags)."
return self.render()
@property
def scripts(self):
"Returns all <script></script> tags required with Google Maps JavaScript."
return mark_safe('%s\n <script type="text/javascript">\n//<![CDATA[\n%s//]]>\n </script>' % (self.api_script, self.js))
@property
def style(self):
"Returns additional CSS styling needed for Google Maps on IE."
return mark_safe('<style type="text/css">%s</style>' % self.vml_css)
@property
def xhtml(self):
"Returns XHTML information needed for IE VML overlays."
return mark_safe('<html xmlns="http://www.w3.org/1999/xhtml" %s>' % self.xmlns)
@property
def icons(self):
"Returns a sequence of GIcon objects in this map."
return set([marker.icon for marker in self.markers if marker.icon])
class GoogleMapSet(GoogleMap):
def __init__(self, *args, **kwargs):
"""
A class for generating sets of Google Maps that will be shown on the
same page together.
Example:
gmapset = GoogleMapSet( GoogleMap( ... ), GoogleMap( ... ) )
gmapset = GoogleMapSet( [ gmap1, gmap2] )
"""
# The `google-multi.js` template is used instead of `google-single.js`
# by default.
template = kwargs.pop('template', 'gis/google/google-multi.js')
# This is the template used to generate the GMap load JavaScript for
# each map in the set.
self.map_template = kwargs.pop('map_template', 'gis/google/google-single.js')
# Running GoogleMap.__init__(), and resetting the template
# value with default obtained above.
super(GoogleMapSet, self).__init__(**kwargs)
self.template = template
# If a tuple/list passed in as first element of args, then assume
if isinstance(args[0], (tuple, list)):
self.maps = args[0]
else:
self.maps = args
# Generating DOM ids for each of the maps in the set.
self.dom_ids = ['map%d' % i for i in xrange(len(self.maps))]
def load_map_js(self):
"""
Returns JavaScript containing all of the loading routines for each
map in this set.
"""
result = []
for dom_id, gmap in zip(self.dom_ids, self.maps):
# Backup copies the GoogleMap DOM id and template attributes.
# They are overridden on each GoogleMap instance in the set so
# that only the loading JavaScript (and not the header variables)
# is used with the generated DOM ids.
tmp = (gmap.template, gmap.dom_id)
gmap.template = self.map_template
gmap.dom_id = dom_id
result.append(gmap.js)
# Restoring the backup values.
gmap.template, gmap.dom_id = tmp
return mark_safe(''.join(result))
def render(self):
"""
Generates the JavaScript for the collection of Google Maps in
this set.
"""
params = {'js_module' : self.js_module,
'dom_ids' : self.dom_ids,
'load_map_js' : self.load_map_js(),
'icons' : self.icons,
}
params.update(self.extra_context)
return render_to_string(self.template, params)
@property
def onload(self):
"Returns the `onload` HTML <body> attribute."
# Overloaded to use the `load` function defined in the
# `google-multi.js`, which calls the load routines for
# each one of the individual maps in the set.
return mark_safe('onload="%s.load()"' % self.js_module)
@property
def icons(self):
"Returns a sequence of all icons in each map of the set."
icons = set()
for map in self.maps: icons |= map.icons
return icons
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