In modern web apps, knowing the location of your customer can be very important. A friend and I are developing a location-based service right now. I whipped up the following Ruby code that uses the hostip.info API to fetch a user's location based on his IP address.
require 'net/http'
def ...
def encode(num)
str = ""
num = (num * 1e5).floor
num <<= 1
num = ~num if num < 0
while num >= 0x20
str += (((num & 0x1f) | 0x20) + 63).chr
num >>= 5
end
str += (num+63).chr
return str
end
def to_encoded_polyline(points)
polyline = ""
points.each do |point|
polyline += encode(point[:lat])
polyline += encode(point[:lng])
end
return polyline
end
