Delti

Delti is a tiny library which provides you with the easiest imaginable delta time calculation for your loops.

Writing a game engine, UI library, or intensive routine task, and need a delta time? All you need to do is:

1. require 'delti' in your file
2. include Delti in your class or module
3. Call dt! to get the time since the last dt! call in that location

The first call will always return nil, and subsequent calls return a Float of the number of seconds since the last call.

You can use more than one dt! call at a time, and it'll always give you the delta time since THAT last call, indexed by source line and file.

Example

With just one use of dt!:

include Delti

loop do
  sleep 1
  p dt!
end

# Output:
#   nil
#   1.0012476179981604
#   1.0011373269990145
#   1.0011775080020016
#   1.0012207549989398
#   1.0012018039997201
#   1.001209079000546

With multiple uses of dt!, each keeping track of their own time:

include Delti

Thread.new do
  loop do
    sleep 2
    p dt!
  end
end

Thread.new do
  loop do
    sleep 1
    p dt!
  end
end

loop {} # to prevent exit

# Output:
#   nil
#   nil
#   1.100102615000651
#   1.0001914450003824
#   2.0021415269984573
#   1.1020770069990249
#   1.1002259790002427
#   2.101181769001414

Contributing

Bug reports and pull requests are welcome on GitHub at https://github.com/AaronC81/delti.

License

The gem is available as open source under the terms of the MIT License.