redraw edges when moving nodes around

0019-B

@@ -1,11 +1,9 @@
 B = function(preserve_screen_top_of_cursor_node)
-	print('B')
 	-- recompute various aspects based on the current viewport settings
 	love.graphics.setFont(love.graphics.newFont(scale(20)))  -- editor objects implicitly depend on current font so update it
 	for _,obj in ipairs(Surface) do
 		if obj.type == 'line' then
 			obj.zdata = {}
-			print('A', #obj.data)
 			for i=1,#obj.data,2 do
 				table.insert(obj.zdata, vx(obj.data[i]))
 				table.insert(obj.zdata, vy(obj.data[i+1]))

0028-A

@@ -1,5 +1,4 @@
 A = function(preserve_screen_top_of_cursor_node)
-	print('A')
 	-- translate Nodes to Surface
 	while #Surface > 0 do table.remove(Surface) end
 	for key,node in pairs(Nodes) do

0040-A1

@@ -5,13 +5,26 @@ A1 = function(id, preserve_screen_top_of_cursor_node)
 	-- delete previously added shapes for this node:
 	for i=#Surface,1,-1 do
 		local x = Surface[i]
-		if x.id == id then
+		if x.id then print(x.id, x.type)
+		elseif x.keys then
+			print('keys', x.type)
+			for _,k in ipairs(x.keys) do
+				print('', k)
+			end
+		end
+		if x.id == id or (x.keys and table.find(x.keys, id)) then
 			table.remove(Surface, i)
 		end
 	end
 	-- translate Nodes to Surface
 	local node = Nodes[id]
 	compute_layout(node, node.x,node.y, Surface, preserve_screen_top_of_cursor_node)
+	for _,d in ipairs(node.outgoing_edges) do
+		compute_layout_for_edge(id, d)
+	end
+	for _,s in ipairs(node.incoming_edges) do
+		compute_layout_for_edge(s, id)
+	end
 	-- continue the pipeline
 	B(preserve_screen_top_of_cursor_node)
 end

0059-compute_layout_for_edge

@@ -1,7 +1,7 @@
 compute_layout_for_edge = function(s, e)
 	local cs = centroid(Nodes[s])
 	local ce = centroid(Nodes[e])
-	local s = intersect_with_centroid(Nodes[s], ce.sx,ce.sy)
-	local e = intersect_with_centroid(Nodes[e], s.sx,s.sy)
-	table.insert(Surface, {type='line', r=0,g=0,b=0, data={s.sx,s.sy, e.sx,e.sy}})
-end
+	local s2 = intersect_with_centroid(Nodes[s], ce.sx,ce.sy)
+	local e2 = intersect_with_centroid(Nodes[e], s2.sx,s2.sy)
+	table.insert(Surface, {type='line', r=0,g=0,b=0, data={s2.sx,s2.sy, e2.sx,e2.sy}, keys={s,e}})
+end