set 'allowTouchSnag: true' for all draggable objects
update
add missing image
remove unnecessary changes to arrow button visibility
simplify variableWavelength.link function
move scaling out of FaucetNode, specify scale via options arg
merge MomentaryButton into ToggleButton, generalize, change image file names
add options to ArrowButton
use strict
use strict
consolidate "pipe" code, note problem with using scenery.Pattern
update
update