| 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()) |