on.update = function(dt)
	if Animating then
		animate_next(dt)
		return
	end
	if Pan then
		set_mouse_cursor('hand')
	elseif Move or on_handle(App.mouse_x(), App.mouse_y()) then
		set_mouse_cursor('crosshair')
	else
		set_mouse_cursor('arrow')
	end
	if Pan then
		Viewport.x = Pan.x - App.mouse_x()/Viewport.zoom
		Viewport.y = Pan.y - App.mouse_y()/Viewport.zoom
		B()
		return
	end
	if Move then
		Move.node.x = sx(App.mouse_x()-Move.xoff)
		Move.node.y = sy(App.mouse_y()-Move.yoff)
		A1(Move.node.key)
		return
	end
end