1 from django.utils.safestring import mark_safe

     2 from django.contrib.gis.geos import fromstr, Point, LineString, LinearRing, Polygon

     3 

     4 class GEvent(object):

     5     """

     6     A Python wrapper for the Google GEvent object.

     7 

     8     Events can be attached to any object derived from GOverlayBase with the

     9     add_event() call.

    10 

    11     For more information please see the Google Maps API Reference:

    12      http://code.google.com/apis/maps/documentation/reference.html#GEvent

    13 

    14     Example:

    15 

    16       from django.shortcuts import render_to_response

    17       from django.contrib.gis.maps.google import GoogleMap, GEvent, GPolyline

    18 

    19       def sample_request(request):

    20           polyline = GPolyline('LINESTRING(101 26, 112 26, 102 31)')

    21           event = GEvent('click', 

    22             'function() { location.href = "http://www.google.com"}')

    23           polyline.add_event(event)

    24           return render_to_response('mytemplate.html', 

    25           {'google' : GoogleMap(polylines=[polyline])})

    26     """

    27 

    28     def __init__(self, event, action):

    29         """

    30         Initializes a GEvent object. 

    31         

    32         Parameters:

    33 

    34         event: 

    35           string for the event, such as 'click'. The event must be a valid

    36           event for the object in the Google Maps API. 

    37           There is no validation of the event type within Django.

    38 

    39         action:

    40           string containing a Javascript function, such as 

    41           'function() { location.href = "newurl";}'

    42           The string must be a valid Javascript function. Again there is no 

    43           validation fo the function within Django.

    44         """

    45         self.event = event

    46         self.action = action

    47 

    48     def __unicode__(self):

    49         "Returns the parameter part of a GEvent."

    50         return mark_safe('"%s", %s' %(self.event, self.action))

    51 

    52 class GOverlayBase(object):

    53     def __init__(self):

    54         self.events = []

    55 

    56     def latlng_from_coords(self, coords):

    57         "Generates a JavaScript array of GLatLng objects for the given coordinates."

    58         return '[%s]' % ','.join(['new GLatLng(%s,%s)' % (y, x) for x, y in coords])

    59 

    60     def add_event(self, event):

    61         "Attaches a GEvent to the overlay object."

    62         self.events.append(event)

    63 

    64     def __unicode__(self):

    65         "The string representation is the JavaScript API call."

    66         return mark_safe('%s(%s)' % (self.__class__.__name__, self.js_params))

    67 

    68 class GPolygon(GOverlayBase):

    69     """

    70     A Python wrapper for the Google GPolygon object.  For more information

    71     please see the Google Maps API Reference:

    72      http://code.google.com/apis/maps/documentation/reference.html#GPolygon

    73     """

    74     def __init__(self, poly, 

    75                  stroke_color='#0000ff', stroke_weight=2, stroke_opacity=1,

    76                  fill_color='#0000ff', fill_opacity=0.4):

    77         """

    78         The GPolygon object initializes on a GEOS Polygon or a parameter that

    79         may be instantiated into GEOS Polygon.  Please note that this will not

    80         depict a Polygon's internal rings.

    81 

    82         Keyword Options:

    83 

    84           stroke_color:

    85             The color of the polygon outline. Defaults to '#0000ff' (blue).

    86 

    87           stroke_weight:

    88             The width of the polygon outline, in pixels.  Defaults to 2.

    89 

    90           stroke_opacity:

    91             The opacity of the polygon outline, between 0 and 1.  Defaults to 1.

    92 

    93           fill_color:

    94             The color of the polygon fill.  Defaults to '#0000ff' (blue).

    95 

    96           fill_opacity:

    97             The opacity of the polygon fill.  Defaults to 0.4.

    98         """

    99         if isinstance(poly, basestring): poly = fromstr(poly)

   100         if isinstance(poly, (tuple, list)): poly = Polygon(poly)

   101         if not isinstance(poly, Polygon): 

   102             raise TypeError('GPolygon may only initialize on GEOS Polygons.')

   103 

   104         # Getting the envelope of the input polygon (used for automatically

   105         # determining the zoom level).

   106         self.envelope = poly.envelope

   107 

   108         # Translating the coordinates into a JavaScript array of 

   109         # Google `GLatLng` objects.

   110         self.points = self.latlng_from_coords(poly.shell.coords)

   111 

   112         # Stroke settings.

   113         self.stroke_color, self.stroke_opacity, self.stroke_weight = stroke_color, stroke_opacity, stroke_weight

   114       

   115         # Fill settings.

   116         self.fill_color, self.fill_opacity = fill_color, fill_opacity

   117        

   118         super(GPolygon, self).__init__()

   119  

   120     @property

   121     def js_params(self):

   122         return '%s, "%s", %s, %s, "%s", %s' % (self.points, self.stroke_color, self.stroke_weight, self.stroke_opacity,

   123                                                self.fill_color, self.fill_opacity)

   124 

   125 class GPolyline(GOverlayBase):

   126     """

   127     A Python wrapper for the Google GPolyline object.  For more information

   128     please see the Google Maps API Reference:

   129      http://code.google.com/apis/maps/documentation/reference.html#GPolyline

   130     """

   131     def __init__(self, geom, color='#0000ff', weight=2, opacity=1):

   132         """

   133         The GPolyline object may be initialized on GEOS LineStirng, LinearRing,

   134         and Polygon objects (internal rings not supported) or a parameter that

   135         may instantiated into one of the above geometries.

   136 

   137         Keyword Options:

   138           

   139           color:

   140             The color to use for the polyline.  Defaults to '#0000ff' (blue).

   141   

   142           weight:

   143             The width of the polyline, in pixels.  Defaults to 2.

   144 

   145           opacity:

   146             The opacity of the polyline, between 0 and 1.  Defaults to 1.

   147         """

   148         # If a GEOS geometry isn't passed in, try to contsruct one.

   149         if isinstance(geom, basestring): geom = fromstr(geom)

   150         if isinstance(geom, (tuple, list)): geom = Polygon(geom)

   151         # Generating the lat/lng coordinate pairs.

   152         if isinstance(geom, (LineString, LinearRing)):

   153             self.latlngs = self.latlng_from_coords(geom.coords)

   154         elif isinstance(geom, Polygon):

   155             self.latlngs = self.latlng_from_coords(geom.shell.coords)

   156         else:

   157             raise TypeError('GPolyline may only initialize on GEOS LineString, LinearRing, and/or Polygon geometries.')

   158 

   159         # Getting the envelope for automatic zoom determination.

   160         self.envelope = geom.envelope

   161         self.color, self.weight, self.opacity = color, weight, opacity

   162         super(GPolyline, self).__init__()

   163         

   164     @property

   165     def js_params(self):

   166         return '%s, "%s", %s, %s' % (self.latlngs, self.color, self.weight, self.opacity)

   167 

   168 class GMarker(GOverlayBase):

   169     """

   170     A Python wrapper for the Google GMarker object.  For more information

   171     please see the Google Maps API Reference:

   172      http://code.google.com/apis/maps/documentation/reference.html#GMarker

   173 

   174     Example:

   175 

   176       from django.shortcuts import render_to_response

   177       from django.contrib.gis.maps.google.overlays import GMarker, GEvent

   178      

   179       def sample_request(request):

   180           marker = GMarker('POINT(101 26)')

   181           event = GEvent('click', 

   182                          'function() { location.href = "http://www.google.com"}')

   183           marker.add_event(event)

   184           return render_to_response('mytemplate.html', 

   185                  {'google' : GoogleMap(markers=[marker])})

   186     """

   187     def __init__(self, geom, title=None):

   188         """

   189         The GMarker object may initialize on GEOS Points or a parameter

   190         that may be instantiated into a GEOS point.  Keyword options map to

   191         GMarkerOptions -- so far only the title option is supported.

   192 

   193         Keyword Options:

   194          title: 

   195            Title option for GMarker, will be displayed as a tooltip.

   196         """

   197         # If a GEOS geometry isn't passed in, try to construct one.

   198         if isinstance(geom, basestring): geom = fromstr(geom)

   199         if isinstance(geom, (tuple, list)): geom = Point(geom)

   200         if isinstance(geom, Point):

   201             self.latlng = self.latlng_from_coords(geom.coords)

   202         else:

   203             raise TypeError('GMarker may only initialize on GEOS Point geometry.')

   204         # Getting the envelope for automatic zoom determination.

   205         self.envelope = geom.envelope

   206         # TODO: Add support for more GMarkerOptions

   207         self.title = title

   208         super(GMarker, self).__init__()

   209 

   210     def latlng_from_coords(self, coords):

   211         return 'new GLatLng(%s,%s)' %(coords[1], coords[0])

   212     

   213     def options(self):

   214         result = []

   215         if self.title: result.append('title: "%s"' % self.title) 

   216         return '{%s}' % ','.join(result)

   217 

   218     @property

   219     def js_params(self):

   220         return '%s, %s' % (self.latlng, self.options())