# File lib/rubygame/clock.rb, line 116
                        def tick()
                                passed = Clock.runtime - @last_tick  # how long since the last tick?
                                if @target_frametime
                                        return Clock.delay(@target_frametime - passed) + passed
                                end
                                return passed
                        ensure
                                @last_tick = Clock.runtime()
                                @ticks += 1
                        end