def get_extents_from_center_lat_lng(center, zoom, width, height):
northeast = Units.add_pixels_to_latlng(center.clone(), zoom,
int(width / 2),
-1 * int(height / 2))
southwest = Units.add_pixels_to_latlng(center.clone(), zoom,
-1 * int(width / 2),
int(height / 2))
return Extents(northeast, southwest)
def get_basemap_and_extents(self, map_type, zoom, center, width, height):
import os, urllib, StringIO, Image
#units.Units.add_pixels_to_latlng(center_lat, center_lng, zoom, 300, 300)
map_url = None
# http://api.tiles.mapbox.com/v3/{mapid}/{lon},{lat},{z}/{width}x{height}.{format}
# http://api.tiles.mapbox.com/v3/examples.map-zr0njcqy/-73.99,40.70,13/500x300.png
if map_type.overlay_source.name == 'mapbox':
styleid = map_type.provider_id
'''
map_url = 'http://staticmaps.cloudmade.com/' + api_key + \
'/staticmap?styleid=' + styleid + '&zoom=' + str(zoom) + \
'¢er=' + str(center.y) + ',' + str(center.x) + \
'&size=' + str(width) + 'x' + str(height)
'''
map_url = 'http://api.tiles.mapbox.com/v3/{0}/{1},{2},{3}/{4}x{5}.png'
map_url = map_url.format(map_type.provider_id, center.x, center.y, zoom, width, height)
#if google is the map provider:
else:
scale_factor = 1
if not settings.IS_GOOGLE_REGISTERED_NONPROFIT:
zoom, width, height = zoom-1, int(width/2), int(height/2)
scale_factor = 2
map_url = map_type.wms_url + '&zoom=' + str(zoom) + '¢er=' + \
str(center.y) + ',' + str(center.x) + '&size=' + str(width) + \
'x' + str(height) + '&scale=' + str(scale_factor)
#calculate extents (returns geos Point):
#(0,0) in pacific northwest; x = lat, y = lng
northeast = Units.add_pixels_to_latlng(center.clone(), zoom, int(width/2), -1*int(height/2))
southwest = Units.add_pixels_to_latlng(center.clone(), zoom, -1*int(width/2), int(height/2))
try:
file = urllib.urlopen(map_url)
map_image = StringIO.StringIO(file.read()) # constructs a StringIO holding the image
map_image = Image.open(map_image).convert('RGB')
except IOError:
error_image_url = 'https://chart.googleapis.com/chart?chst=d_fnote_title&chld=sticky_y|1|FF0000|l|Map%20Service%20Unavailable|'
file = urllib.urlopen(error_image_url)
map_image = StringIO.StringIO(file.read()) # constructs a StringIO holding the image
map_image = Image.open(map_image).convert('RGB')
return {
'map_image': map_image,
'northeast': northeast,
'southwest': southwest
}
def generate_image_with_map_margins(self):
from localground.apps.lib.helpers.units import Units
from django.contrib.gis.geos import Polygon
# determine the width of the map margins (given the current scaling):
top, left, bottom, right = self.map_rect.get_margins(self.pil_image)
# scale image to its original print size:
zoom = self.mapimage.source_print.zoom
old_width = self.mapimage.source_print.map_width
old_height = self.mapimage.source_print.map_height
self.logger.log('old width: %s, old height: %s, zoom: %s'
% (old_width, old_height, zoom))
# determine scale factor based on current cropped map: how much should
# current image size be increased / decreased?
w, h = self.map_rect.get_width(), self.map_rect.get_height()
sf_w = (1.0*old_width)/w
sf_h = (1.0*old_height)/h
self.logger.log(
'scale factor width: %s, scale factor height: %s' % (sf_w, sf_h))
# scale margins:
top, left, bottom, right = top*sf_h, left*sf_w, bottom*sf_h, right*sf_w
center = self.mapimage.source_print.center
northeast = Units.add_pixels_to_latlng(
center.clone(), zoom, int(1.0*old_width/2 + left),
int(-1.0*old_height/2 - top))
southwest = Units.add_pixels_to_latlng(
center.clone(), zoom, int(-1.0*old_width/2 - right),
int(1.0*old_height/2 + bottom))
bbox = (northeast.coords, southwest.coords)
bbox = [element for tupl in bbox for element in tupl]
extents = Polygon.from_bbox(bbox)
# punch holes in image:
hollowed_image = self.pil_image.copy()
mask = Image.new('L', hollowed_image.size, color=255)
draw = ImageDraw.Draw(mask)
draw.polygon(self.map_rect.to_cv_poly(), fill=0)
hollowed_image.putalpha(mask)
return northeast, southwest, extents, hollowed_image
def get_extents_from_center_lat_lng(center, zoom, width, height):
northeast = Units.add_pixels_to_latlng(center.clone(), zoom, int(width/2), -1*int(height/2))
southwest = Units.add_pixels_to_latlng(center.clone(), zoom, -1*int(width/2), int(height/2))
return Extents(northeast, southwest)
