Originally Posted by Psoewish
Well technically there is, if you program the entire terrain of wow in it. But that would take a huge amount of time to make, and I imagine it would be a very resource intensive addon as well :]
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Or use a pre-fabricated database of waypoints, like the old addon the OP mentioned. For the uninformed, here's how it worked (sort of):
We've got five waypoint nodes, Q E S Z V. (Look at your QWERTY keyboard, its a map!) Each of those nodes only connects to certain other nodes, but not all of them.
Q to E, Z
E to Q, S, V
Z to Q, V
V to E, Z
S to E
If you're at Z and want to go to S, you have to take the shortest route possible. Q is closer to Z than V is, so the indicator has to point to Q. Then you have to go to E, and then S. The indicator wouldn't point directly from Z to S.
Now, what such database would do is effectively provide a map for the addon to navigate. Making such "maps" could be aided by another module that lets you add the nodes; To connect two (or more routes) to another node, this module could also display the nodes on your world map, so that you can play connect-the-dots.