ease.rb

def tick args
  # defaults
  args.state.start_x    ||= 10
  args.state.end_x      ||= 1260
  args.state.start_tick ||= 180
  args.state.duration   ||= 300

  # calc
  next_x = ease current_tick: args.state.tick_count,
                start_tick:   args.state.start_tick,
                duration:     args.state.duration,
                start_value:  args.state.start_x,
                end_value:    args.state.end_x

  # render
  args.outputs.solids << [next_x, 360, 10, 10]

  if args.state.tick_count < args.state.start_tick && args.state.tick_count != 0
    countdown = args.state.start_tick - args.state.tick_count
    args.outputs.labels << [640, 400, "#{countdown.idiv(60) + 1}", 10, 1]
  elsif args.state.tick_count > (args.state.start_tick + args.state.duration)
    args.outputs.labels << [640, 400, "Simulation has ended. Click anywhere to reset.", 0, 1]
  end

  # input
  if args.inputs.mouse.click
    args.gtk.reset
  end
end


def ease opts
  return opts[:start_value] if opts[:current_tick] < opts[:start_tick]
  return opts[:end_value]   if opts[:current_tick] > (opts[:start_tick] + opts[:duration])
  $gtk.args.outputs.labels << [640, 400, "TODO: look at line 36.", 0, 1]

  totalDistance = opts[:end_value] - opts[:start_value]
  theValue = (totalDistance*((opts[:current_tick]-opts[:start_tick])/opts[:duration]))+opts[:start_value]
  puts theValue
  return theValue
end