on_resize = function(sx,sy)
	for _,node in ipairs(Nodes) do
		if sx >= node.x+node.w+20 and sx < node.x+node.w+24 then
			local buffer_height = math.max(node.h, 3*node.editor.line_height)
			if sy >= node.y and sy < node.y+buffer_height then
				return true
			end
		end
	end
end

on_move_bar = function(sx,sy)
	for _,node in ipairs(Nodes) do
		if sx >= node.x-10 and sx < node.x-10+node.w/2 then
			if sy >= node.y - 40 and sy < node.y-20 then
				return true
			end
		end
	end
end

sy = function(vy)
	return vy/Viewport.zoom + Viewport.y
end

sx = function(vx)
	return vx/Viewport.zoom + Viewport.x
end

set_mouse_cursor = function(name)
	if Mouse_cursor ~= name then
		Mouse_cursor = name
		love.mouse.setCursor(love.mouse.getSystemCursor(name))
	end
end

	{type='text', x=0,y=0, margin=0, width=400, bg={r=0,g=1,b=1}},

	{type='text', x=0,y=0, margin=0, width=120},

	print('A')

	print('compute_layout')

		-- render background if necessary
		local node_to_render
		if node.bg then
			node_to_render = {type='rectangle', drawmode='line', r=0.5, g=0.5, b=0.5, x=node.x-10, y=node.y-10, corner_radius=5}
			table.insert(nodes_to_render, node_to_render)
		end

		-- render a bar to grab for moving the node
		local move_bar = {type='rectangle', r=0.5,g=0.5,b=0.5, x=node.x-10, y=node.y-10-10-4, h=4}
		table.insert(nodes_to_render, move_bar)
		-- render bounding box
		local bounding_box = {type='rectangle', drawmode='line', r=0.5, g=0.5, b=0.5, x=node.x-10, y=node.y-10, corner_radius=5}
		table.insert(nodes_to_render, bounding_box)

		if node_to_render then
			node_to_render.w = node.w+20
			node_to_render.h = math.max(node.h, 3*node.editor.line_height)+20
		end

		move_bar.w = node.w/2
		bounding_box.w = node.w+20
		local buffer_height = math.max(node.h, 3*node.editor.line_height)
		bounding_box.h = buffer_height+20
		-- resize affordance
		table.insert(nodes_to_render, {type='line', r=0.7,g=0.7,b=0.7, data={node.x+node.w+20,node.y, node.x+node.w+20,node.y+buffer_height}})
		table.insert(nodes_to_render, {type='line', r=0.7,g=0.7,b=0.7, data={node.x+node.w+20+4,node.y, node.x+node.w+20+4,node.y+buffer_height}})

	print('B')

			print('A', #obj.data)

		return

end

	local sx = sx(App.mouse_x())
	local sy = sy(App.mouse_y())
	if on_move_bar(sx, sy) then
		set_mouse_cursor('crosshair')
	elseif on_resize(sx, sy) then
		set_mouse_cursor('sizewe')
	else
		set_mouse_cursor('arrow')
	end
end