Map view follows trackers

[jsyrjala]

Add functionality for following tracker(s). Map is centered/zoomed so that selected trackers are visible. When tracker(s) move, move also map.

• If only one tracker is selected, the map should only move, no zoom.
• If several trackers are selected, the map should move and zoom so that all trackers are visible
• When tracker moves / or moves near borders the map is recentered
• It should be easy to enable and disable following without navigating out of map page. Manually moving the map should disable the following so that the user can look around.

[jsyrjala]

Currently centers on latest tracker event, which is not good.

[kipe]

Also a timeout for zoom/re-center actions is needed.
Now if you drag the map to check the driven route etc, the map jumps to the latest location instantly.
In my own system all drag events are catched, and they set a timestamp. This is checked when a new event comes and if the last drag was over 10 seconds ago, the zoom/re-center happens, otherwise it's ignored.