vx(Move.node.pos.x-Move.node.hs.x),
			vy(Move.node.pos.y-Move.node.hs.y),
			scale(Move.node.hs.x*2),
			scale(Move.node.hs.y*2))
		love.graphics.rectangle('line',
			vx(Move.oldx), vy(Move.oldy),
			scale(Move.node.w), scale(Move.node.h))
	end
		-- show original location of node, to help put it back

-- Create pos+halfsize representation for nodes
-- pad out one node fully, and all other nodes just enough to keep them from overlapping.
-- We don't want cascading movements to get too chaotic.
prepare_to_move = function(target)

-- see https://akkartik.itch.io/carousel/devlog/649349/handling-cascading-collisions
move_others = function(a, depth)
	if depth == nil then depth = 0 end
	if depth > 10 then return end
--	print('move others', a.key)

-- see https://akkartik.itch.io/carousel/devlog/649349/handling-cascading-collisions
collide = function(a, b)
	local delta = {x=a.pos.x-b.pos.x, y=a.pos.y-b.pos.y}
	local abs_delta = {x=math.abs(a.pos.x-b.pos.x), y=math.abs(a.pos.y-b.pos.y)}
	local size = {x=a.hs.x+b.hs.x, y=a.hs.y+b.hs.y}
	local abs_amount = {x=size.x-abs_delta.x, y=size.y-abs_delta.y}
	if abs_amount.x > 0 and abs_amount.y > 0 then
		if abs_amount.x <= abs_amount.y then
			return {x=abs_amount.x*sign(delta.x), y=0}