straydogstudio
/ circle_path
Last active
September 11, 2018 21:18
Convert latitude/longitude pair with radius in meters to 16 sided polygon useful in GIS. Useful for converting a Google maps drawing manager circle into a polygon for storage in a GIS system. Implemented as a class method.
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| def self.circle_path(center, radius, complete_path = false) | |
| # For increased accuracy, if your data is in a localized area, add the elevation in meters to r_e below: | |
| r_e = 6378137.0 | |
| @@d2r ||= Math::PI/180 | |
| @@multipliers ||= begin | |
| segments = 16 | |
| dRad = 2*Math::PI/segments | |
| (segments + (complete_path ? 1 : 0)).times.map do |i| | |
| rads = dRad*i | |
| y = Math.sin(rads) |
maccman
/ juggernaut_channels.rb
Created
June 26, 2012 04:56
Sinatra Server Side Event streaming with private channels.
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| # Usage: redis-cli publish message.achannel hello | |
| require 'sinatra' | |
| require 'redis' | |
| conns = Hash.new {|h, k| h[k] = [] } | |
| Thread.abort_on_exception = true | |
| get '/' do |
aerickson
/ ruby seconds to human readable
Created
March 30, 2011 08:33
from http://stackoverflow.com/questions/4136248/how-to-generate-a-human-readable-time-range-using-ruby-on-rails
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| def humanize secs | |
| [[60, :seconds], [60, :minutes], [24, :hours], [1000, :days]].map{ |count, name| | |
| if secs > 0 | |
| secs, n = secs.divmod(count) | |
| "#{n.to_i} #{name}" | |
| end | |
| }.compact.reverse.join(' ') | |
| end |
guenter
/ move_to_rds.rb
Created
November 11, 2010 02:14
A quick and dirty script to move a database into Amazon RDS (or any other database). Can transfer part of the data beforehand.
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| require 'fileutils' | |
| start_time = Time.now | |
| SOURCE_DB = { | |
| :name => 'db_name', | |
| :user => 'db_user', | |
| :password => 'db_pass', | |
| :host => 'localhost' |