349413a520
the SWF queries which sometimes reference more than one table with columns named latitude and longitude.
81 lines
1.8 KiB
Ruby
81 lines
1.8 KiB
Ruby
module QuadTile
|
|
begin
|
|
require "quad_tile/quad_tile_so"
|
|
rescue MissingSourceFile
|
|
def self.tile_for_point(lat, lon)
|
|
x = ((lon + 180) * 65535 / 360).round
|
|
y = ((lat + 90) * 65535 / 180).round
|
|
|
|
return tile_for_xy(x, y)
|
|
end
|
|
|
|
def self.tiles_for_area(minlat, minlon, maxlat, maxlon)
|
|
minx = ((minlon + 180) * 65535 / 360).round
|
|
maxx = ((maxlon + 180) * 65535 / 360).round
|
|
miny = ((minlat + 90) * 65535 / 180).round
|
|
maxy = ((maxlat + 90) * 65535 / 180).round
|
|
tiles = []
|
|
|
|
minx.upto(maxx) do |x|
|
|
miny.upto(maxy) do |y|
|
|
tiles << tile_for_xy(x, y)
|
|
end
|
|
end
|
|
|
|
return tiles
|
|
end
|
|
|
|
def self.tile_for_xy(x, y)
|
|
t = 0
|
|
|
|
16.times do
|
|
t = t << 1
|
|
t = t | 1 unless (x & 0x8000).zero?
|
|
x <<= 1
|
|
t = t << 1
|
|
t = t | 1 unless (y & 0x8000).zero?
|
|
y <<= 1
|
|
end
|
|
|
|
return t
|
|
end
|
|
end
|
|
|
|
def self.sql_for_area(minlat, minlon, maxlat, maxlon, prefix)
|
|
sql = Array.new
|
|
single = Array.new
|
|
|
|
iterate_tiles_for_area(minlat, minlon, maxlat, maxlon) do |first,last|
|
|
if first == last
|
|
single.push(first)
|
|
else
|
|
sql.push("#{prefix}tile BETWEEN #{first} AND #{last}")
|
|
end
|
|
end
|
|
|
|
sql.push("#{prefix}tile IN (#{single.join(',')})") if single.size > 0
|
|
|
|
return "( " + sql.join(" OR ") + " )"
|
|
end
|
|
|
|
def self.iterate_tiles_for_area(minlat, minlon, maxlat, maxlon)
|
|
tiles = tiles_for_area(minlat, minlon, maxlat, maxlon)
|
|
first = last = nil
|
|
|
|
tiles.sort.each do |tile|
|
|
if last.nil?
|
|
first = last = tile
|
|
elsif tile == last + 1
|
|
last = tile
|
|
else
|
|
yield first, last
|
|
|
|
first = last = tile
|
|
end
|
|
end
|
|
|
|
yield first, last unless last.nil?
|
|
end
|
|
|
|
private_class_method :tile_for_xy, :iterate_tiles_for_area
|
|
end
|