Class: Worlds::Updater

Inherits:
Object
  • Object
show all
Defined in:
lib/worlds/terminal/updater.rb

Overview

A container for ::tick, which processes input and updates the world state.

Constant Summary collapse

UPDATES_PER_SECOND = 
1

Class Method Summary collapse

Class Method Details

.started? ⇒ Boolean

Whether the world has been started.

Returns:

  • (Boolean) 


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# File 'lib/worlds/terminal/updater.rb', line 11

def self.started?
  !!@time_start
end

.tick(input = nil) ⇒ Array<Hash>?

Processes input if any, or performs an update if enough time has passed.

Parameters:

  • input (Hash) (defaults to: nil) —

    a line of input from the player.

Returns:

  • (Array<Hash>, nil) —

    an array of output hashes, if input was processed or an update was performed.



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# File 'lib/worlds/terminal/updater.rb', line 19

def self.tick(input = nil)
  unless started?
    # On why not Time.now, see
    # https://blog.dnsimple.com/2018/03/elapsed-time-with-ruby-the-right-way
    @time_start = Process.clock_gettime(Process::CLOCK_MONOTONIC)

    return World.setup
  end

  return process_input(input) if input

  time_now = Process.clock_gettime(Process::CLOCK_MONOTONIC)
  time_elapsed = time_now - @time_start

  if time_elapsed >= (1.0 / UPDATES_PER_SECOND)
    @time_start = Process.clock_gettime(Process::CLOCK_MONOTONIC)
    return update
  end
end