class Castaway::Animation

Attributes

duration[R]
from[R]
to[R]

Public Class Methods

from_options(options) click to toggle source
# File lib/castaway/animation.rb, line 8
def self.from_options(options)
  factory = Castaway::Interpolation.lookup(options)
  initial = options[:initial] || 0.0
  final = options[:final] || (initial + 1.0)
  interpolator = factory.new(initial, final)

  from  = options[:from] ||
          raise(ArgumentError, 'animations require `from` time')
  to    = options[:to] ||
          (options[:length] ? from + options[:length] : nil) ||
          raise(ArgumentError, 'animations require `to` or `length`')

  new(interpolator, from, to)
end
new(interpolator, from, to) click to toggle source
# File lib/castaway/animation.rb, line 23
def initialize(interpolator, from, to)
  @interpolator = interpolator
  @from = from.to_f
  @to = to.to_f
  @duration = @to - @from
end

Public Instance Methods

[](t) click to toggle source
# File lib/castaway/animation.rb, line 30
def [](t)
  # adjust t to 0..1
  adjusted_t = duration.zero? ? 1.0 : (t - from) / duration.to_f
  @interpolator[adjusted_t]
end