module Expire
# projection object to go from latlon -> spherical mercator
- PROJ = Proj4::Projection.new(["+proj=merc", "+a=6378137", "+b=6378137",
+ PROJ = Proj4::Projection.new(["+proj=merc", "+a=6378137", "+b=6378137",
"+lat_ts=0.0", "+lon_0=0.0", "+x_0=0.0",
- "+y_0=0", "+k=1.0", "+units=m",
+ "+y_0=0", "+k=1.0", "+units=m",
"+nadgrids=@null", "+no_defs +over"])
-
+
# width/height of the spherical mercator projection
SIZE=40075016.6855784
# the size of the meta tile blocks
HASH_ROOT = "/tiles/default/"
# node cache file
NODE_CACHE_FILE="/store/database/nodes"
-
+
# turns a spherical mercator coord into a tile coord
def Expire.tile_from_merc(point, zoom)
# renormalise into unit space [0,1]
# chop of the fractional parts
[point.x.to_int, point.y.to_int, zoom]
end
-
+
# turns a latlon -> tile x,y given a zoom level
def Expire.tile_from_latlon(latlon, zoom)
# first convert to spherical mercator
point = PROJ.forward(latlon)
tile_from_merc(point, zoom)
end
-
+
# this must match the definition of xyz_to_meta in mod_tile
def Expire.xyz_to_meta(x, y, z)
# mask off the final few bits
x &= ~(METATILE - 1)
y &= ~(METATILE - 1)
# generate the path
- hash_path = (0..4).collect { |i|
- (((x >> 4*i) & 0xf) << 4) | ((y >> 4*i) & 0xf)
+ hash_path = (0..4).collect { |i|
+ (((x >> 4*i) & 0xf) << 4) | ((y >> 4*i) & 0xf)
}.reverse.join('/')
z.to_s + '/' + hash_path + ".meta"
end
-
+
# time to reset to, some very stupidly early time, before OSM started
EXPIRY_TIME = Time.parse("2000-01-01 00:00:00")
- # expire the meta tile by setting the modified time back
+ # expire the meta tile by setting the modified time back
def Expire.expire_meta(meta)
puts "Expiring #{meta}"
File.utime(EXPIRY_TIME, EXPIRY_TIME, meta)
end
-
+
def Expire.expire(change_file, min_zoom, max_zoom, tile_dirs)
do_expire(change_file, min_zoom, max_zoom) do |set|
new_set = Set.new
tile_dirs.each do |tile_dir|
meta_set.add(tile_dir + "/" + meta) if File.exist?(tile_dir + "/" + meta)
end
-
+
# add the parent into the set for the next round
new_set.add([xy[0] / 2, xy[1] / 2, xy[2] - 1])
end
-
+
# expire all meta tiles
meta_set.each do |meta|
expire_meta(meta)
end
end
- def Expire.do_expire(change_file, min_zoom, max_zoom, &block)
+ def Expire.do_expire(change_file, min_zoom, max_zoom, &_)
# read in the osm change file
doc = XML::Document.file(change_file)
-
+
# hash map to contain all the nodes
nodes = Hash.new
-
+
# we put all the nodes into the hash, as it doesn't matter whether the node was
# added, deleted or modified - the tile will need updating anyway.
doc.find('//node').each do |node|
if lat > 85
lat = 85
end
- point = Proj4::Point.new(Math::PI * node['lon'].to_f / 180,
+ point = Proj4::Point.new(Math::PI * node['lon'].to_f / 180,
Math::PI * lat / 180)
nodes[node['id'].to_i] = tile_from_latlon(point, max_zoom)
end
-
+
# now we look for all the ways that have changed and put all of their nodes into
# the hash too. this will add too many nodes, as it is possible a long way will be
# changed at only a portion of its length. however, due to the non-local way that
# mapnik does text placement, it may stil not be enough.
#
- # also, we miss cases where nodes are deleted from ways where that node is not
+ # also, we miss cases where nodes are deleted from ways where that node is not
# itself deleted and the coverage of the point set isn't enough to encompass the
# change.
node_cache = NodeCache.new(NODE_CACHE_FILE)
end
end
end
-
- # create a set of all the tiles at the maximum zoom level which are touched by
+
+ # create a set of all the tiles at the maximum zoom level which are touched by
# any of the nodes we've collected. we'll create the tiles at other zoom levels
# by a simple recursion.
set = Set.new nodes.values
-
+
# expire tiles and shrink to the set of parents
- (max_zoom).downto(min_zoom) do |z|
+ (max_zoom).downto(min_zoom) do |_|
# allow the block to work on the set, returning the set at the next
# zoom level
set = yield set
projects / chef.git / blobdiff