from django.utils.safestring import mark_safe from django.contrib.gis.geos import fromstr, Point, LineString, LinearRing, Polygon class GEvent(object): """ A Python wrapper for the Google GEvent object. Events can be attached to any object derived from GOverlayBase with the add_event() call. For more information please see the Google Maps API Reference: http://code.google.com/apis/maps/documentation/reference.html#GEvent Example: from django.shortcuts import render_to_response from django.contrib.gis.maps.google import GoogleMap, GEvent, GPolyline def sample_request(request): polyline = GPolyline('LINESTRING(101 26, 112 26, 102 31)') event = GEvent('click', 'function() { location.href = "http://www.google.com"}') polyline.add_event(event) return render_to_response('mytemplate.html', {'google' : GoogleMap(polylines=[polyline])}) """ def __init__(self, event, action): """ Initializes a GEvent object. Parameters: event: string for the event, such as 'click'. The event must be a valid event for the object in the Google Maps API. There is no validation of the event type within Django. action: string containing a Javascript function, such as 'function() { location.href = "newurl";}' The string must be a valid Javascript function. Again there is no validation fo the function within Django. """ self.event = event self.action = action def __unicode__(self): "Returns the parameter part of a GEvent." return mark_safe('"%s", %s' %(self.event, self.action)) class GOverlayBase(object): def __init__(self): self.events = [] def latlng_from_coords(self, coords): "Generates a JavaScript array of GLatLng objects for the given coordinates." return '[%s]' % ','.join(['new GLatLng(%s,%s)' % (y, x) for x, y in coords]) def add_event(self, event): "Attaches a GEvent to the overlay object." self.events.append(event) def __unicode__(self): "The string representation is the JavaScript API call." return mark_safe('%s(%s)' % (self.__class__.__name__, self.js_params)) class GPolygon(GOverlayBase): """ A Python wrapper for the Google GPolygon object. For more information please see the Google Maps API Reference: http://code.google.com/apis/maps/documentation/reference.html#GPolygon """ def __init__(self, poly, stroke_color='#0000ff', stroke_weight=2, stroke_opacity=1, fill_color='#0000ff', fill_opacity=0.4): """ The GPolygon object initializes on a GEOS Polygon or a parameter that may be instantiated into GEOS Polygon. Please note that this will not depict a Polygon's internal rings. Keyword Options: stroke_color: The color of the polygon outline. Defaults to '#0000ff' (blue). stroke_weight: The width of the polygon outline, in pixels. Defaults to 2. stroke_opacity: The opacity of the polygon outline, between 0 and 1. Defaults to 1. fill_color: The color of the polygon fill. Defaults to '#0000ff' (blue). fill_opacity: The opacity of the polygon fill. Defaults to 0.4. """ if isinstance(poly, basestring): poly = fromstr(poly) if isinstance(poly, (tuple, list)): poly = Polygon(poly) if not isinstance(poly, Polygon): raise TypeError('GPolygon may only initialize on GEOS Polygons.') # Getting the envelope of the input polygon (used for automatically # determining the zoom level). self.envelope = poly.envelope # Translating the coordinates into a JavaScript array of # Google `GLatLng` objects. self.points = self.latlng_from_coords(poly.shell.coords) # Stroke settings. self.stroke_color, self.stroke_opacity, self.stroke_weight = stroke_color, stroke_opacity, stroke_weight # Fill settings. self.fill_color, self.fill_opacity = fill_color, fill_opacity super(GPolygon, self).__init__() @property def js_params(self): return '%s, "%s", %s, %s, "%s", %s' % (self.points, self.stroke_color, self.stroke_weight, self.stroke_opacity, self.fill_color, self.fill_opacity) class GPolyline(GOverlayBase): """ A Python wrapper for the Google GPolyline object. For more information please see the Google Maps API Reference: http://code.google.com/apis/maps/documentation/reference.html#GPolyline """ def __init__(self, geom, color='#0000ff', weight=2, opacity=1): """ The GPolyline object may be initialized on GEOS LineStirng, LinearRing, and Polygon objects (internal rings not supported) or a parameter that may instantiated into one of the above geometries. Keyword Options: color: The color to use for the polyline. Defaults to '#0000ff' (blue). weight: The width of the polyline, in pixels. Defaults to 2. opacity: The opacity of the polyline, between 0 and 1. Defaults to 1. """ # If a GEOS geometry isn't passed in, try to contsruct one. if isinstance(geom, basestring): geom = fromstr(geom) if isinstance(geom, (tuple, list)): geom = Polygon(geom) # Generating the lat/lng coordinate pairs. if isinstance(geom, (LineString, LinearRing)): self.latlngs = self.latlng_from_coords(geom.coords) elif isinstance(geom, Polygon): self.latlngs = self.latlng_from_coords(geom.shell.coords) else: raise TypeError('GPolyline may only initialize on GEOS LineString, LinearRing, and/or Polygon geometries.') # Getting the envelope for automatic zoom determination. self.envelope = geom.envelope self.color, self.weight, self.opacity = color, weight, opacity super(GPolyline, self).__init__() @property def js_params(self): return '%s, "%s", %s, %s' % (self.latlngs, self.color, self.weight, self.opacity) class GMarker(GOverlayBase): """ A Python wrapper for the Google GMarker object. For more information please see the Google Maps API Reference: http://code.google.com/apis/maps/documentation/reference.html#GMarker Example: from django.shortcuts import render_to_response from django.contrib.gis.maps.google.overlays import GMarker, GEvent def sample_request(request): marker = GMarker('POINT(101 26)') event = GEvent('click', 'function() { location.href = "http://www.google.com"}') marker.add_event(event) return render_to_response('mytemplate.html', {'google' : GoogleMap(markers=[marker])}) """ def __init__(self, geom, title=None): """ The GMarker object may initialize on GEOS Points or a parameter that may be instantiated into a GEOS point. Keyword options map to GMarkerOptions -- so far only the title option is supported. Keyword Options: title: Title option for GMarker, will be displayed as a tooltip. """ # If a GEOS geometry isn't passed in, try to construct one. if isinstance(geom, basestring): geom = fromstr(geom) if isinstance(geom, (tuple, list)): geom = Point(geom) if isinstance(geom, Point): self.latlng = self.latlng_from_coords(geom.coords) else: raise TypeError('GMarker may only initialize on GEOS Point geometry.') # Getting the envelope for automatic zoom determination. self.envelope = geom.envelope # TODO: Add support for more GMarkerOptions self.title = title super(GMarker, self).__init__() def latlng_from_coords(self, coords): return 'new GLatLng(%s,%s)' %(coords[1], coords[0]) def options(self): result = [] if self.title: result.append('title: "%s"' % self.title) return '{%s}' % ','.join(result) @property def js_params(self): return '%s, %s' % (self.latlng, self.options())