def update_tile(tile_key_name, children_updated_list, gt_key_name=None):
"""Updates a single tile, returns Tile model corresponding to tile_str. Datastore is not updated."""
if not gt_key_name:
gt_key_name = GeoTree._GEO_TREE_KEY
t = Tile.get_by_key_name(tile_key_name)
if not t:
x,y,z = tile_str_to_tuple(tile_key_name)
t = Tile(x=x, y=y, z=z, gt_key_name=gt_key_name, key_name=tile_key_name)
points = sorted_points_list_limited([])
for child_tile_key_name in children_updated_list:
ct = Tile.get_by_key_name(child_tile_key_name)
if ct:
# in order insert points from child tile to parent
# stop when does not insert any more
# TODO: refactor to a single function
# from native points
if ct.points_native:
for p in json.loads(ct.points_native):
if not points.insert(p):
break
# from points
if ct.points:
for p in json.loads(ct.points):
if not points.insert(p):
break
t.points = (json.dumps(points))
return t
def update_tiles(cls, count=config.COUNT_UPDATE, gt_key_name=None):
"""Update several tiles and puts them into datastore."""
if not gt_key_name:
gt_key_name = cls._GEO_TREE_KEY
gt = cls.get_by_key_name(gt_key_name)
if gt:
# check if the first tile has larger z than min_z, if not - nothing to update
logging.debug(gt_key_name)
logging.debug(gt.tiles_updated)
x,y,z = tile_str_to_tuple(gt.tiles_updated[0])
min_z = get_min_z(gt_key_name)
if not (z > min_z):
r = '\n\nInfo: updated 0 tiles, nothing to update'
return r
needs_update = True
count_updated = 0
while count_updated < count and needs_update:
# get a group of tiles with a common parent (starting with the first)
first_tile = gt.tiles_updated[0]
p = tile_parent(first_tile,return_str=True)
c = tile_children(p,return_str=True)
c_in_updated = [first_tile]
for t in gt.tiles_updated[1:]:
if t in c:
c_in_updated.append(t)
# update parent, use all children for update
t = cls.update_tile(p, c, gt_key_name=gt_key_name)
t.put()
# remove the group of updated children tiles from tiles_updated
tiles_updated = sorted_tiles_set(gt.tiles_updated)
tiles_updated.remove(c_in_updated)
# insert updated tile
tiles_updated.insert(p)
gt.tiles_updated = list(tiles_updated)
gt.put()
# check if the first tile has smaller z than min_z, if not needs_update = False
x,y,z = tile_str_to_tuple(tiles_updated[0])
min_z = get_min_z(gt_key_name)
if z == min_z:
needs_update = False
# increase count_updated
count_updated += 1
else:
return '\n\nError: no GeoTree exists'
def fetch_around_tile(tile_center_str, gt_key_name=None):
"""returns JSON text of all important points in tiles around center tile"""
if not gt_key_name:
gt_key_name = GeoTree._GEO_TREE_KEY
tiles = []
# a square 3x3 tiles around center tile
dx = 1
dy = 1
xc,yc,z = tile_str_to_tuple(tile_center_str)
xend = 2**z-1
ymin = max(0,yc-dy)
ymax = min(xend,yc+dy)
xmin = xc - dx
if xmin < 0:
xmin = xend + 1 + xmin
xmax = xc + dx
if xmax > xend:
xmax = xmax - xend - 1
for y in range(ymin,ymax+1):
if xmin > xmax:
# if go beyond 360 degrees
tiles.extend(Tile.all().filter('gt_key_name', gt_key_name).filter('z',z).filter('y',y).filter('x >=',xmin).filter('x <=',xend).order('-x').fetch(xend-xmin+1))
tiles.extend(Tile.all().filter('gt_key_name', gt_key_name).filter('z',z).filter('y',y).filter('x >=', 0).filter('x <=',xmax).order('-x').fetch(xmax-0+1))
else:
tiles.extend(Tile.all().filter('gt_key_name', gt_key_name).filter('z',z).filter('y',y).filter('x >=',xmin).filter('x <=',xmax).order('-x').fetch(xmax-xmin+1))
if not tiles:
return '[]'
# not to convert from JSON and than back, the JSON string is formatted directly
# [1:-1] below to get rid of '[' and ']' - seems like dirty hack - think about refactoring
tiles_points_json = "["
for t in tiles:
# check that lists are not empty: not None and longer than '[]'
if t.points_native and len(t.points_native)>2:
tiles_points_json += t.points_native[1:-1]+','
if t.points and len(t.points)>2:
tiles_points_json += t.points[1:-1]+','
# [:-1] to get rid of last ','
return tiles_points_json[:-1]+"]"
def test_tile_str_to_tuple(self):
s = '2,3,4,a'
t = (2,3,4)
self.assertEqual(t,geomath.tile_str_to_tuple(s))
def test_tile_str_to_tuple(self):
s = '2,3,4,a'
t = (2, 3, 4)
self.assertEqual(t, geomath.tile_str_to_tuple(s))
