After OptaPlanner finds the best solution for a Vehicle Routing Problem,
users usually want to see it on a real map, such as Google Maps or OpenStreetMap.
optaplanner-webexamples.war for OptaPlanner 6.3 now demonstrates that.
In the case below, I’ve solved a VRP problem with
50 locations and
and projected the best solution with Leaflet and Google Maps.
It’s a case of capacitated vehicle routing: each vehicle can carry
and each location needs a number of items picked up.
Despite that the lines are shown as straight between locations,
actual road distances
were used in the optimization calculations.
In total, the vehicles drive a little under
32 hours, so on average
4 hours per vehicle (includes location service time).
This solution doesn’t take into account rush hour yet, but if such traffic prediction data were available,
we can make OptaPlanner apply that too, which could result in a different best solution.
In the web UI, we can zoom in on a specific location, such as the
Landegem town center,
where we need to pickup 25 items. In this solution, those items are picked up by the yellow vehicle.
The visualization was implemented in 2 different ways:
Apply it now in your case
If you’re using the latest OptaPlanner final release (
6.2.0.Final at the time of writing),
you easily do such visualization too: those webexamples don’t require any API’s new in optaplanner-core 6.3,
so download the nightly snapshot and look for
to see how it’s done.
With Google Map Directions we can also visualize the actual roads used: