[PATCH] LiveGps: Frequent position updates leech too much CPU on low-end devices

[casualwalker]

LiveGps Plugin redraws the screen each time it receives a new set of data from GPSD, which is about once per second.

When JOSM runs on a low-end device (such as a netbook), JOSM reacts very sluggish to user-input, as all CPU power is consumed by frequent updates.

Proposed solution:

• LiveGPS suppresses update events, until a minimal amount of time has elapsed, by default this is set to 5 sec.
• This interval can be configures in a config value named "livegps.refreshinterval" (in milliseconds).

This was already mentioned in the Wiki, although this is not the right place...
​http://wiki.openstreetmap.org/index.php/JOSM/Plugins/LiveGPS#TODOs

I already implemented this feature, it even worked outside ;-)

Patches will follow, as soon as I clean up the code a bit.

[casualwalker]

Patches will follow within the next few days.

[casualwalker]

Patch File LiveGpsSuppressor.java

[casualwalker]

Patch for LiveGpsAcquirer.java

[casualwalker]

If you have any questions re these patches or need another format, re-open this bug and ask me.

[stoecker]

Don't close tickets until patches have been applied. Closed tickets are history. Nobody cares for them.

[stoecker]

In [o18941].

Some rules for next time

• Use .diff or .patch as extension
• Only one patchfile
• Don't reformat code you did not change
• Don't leave pointless debug code inside

[casualwalker]

Got myself a svn account and improved this feature some more:

• Config setting is in seconds
• Set to 0 disables the suppression
• each position from gpsd still will be added to the layer (and the track); so, when the display is eventually refreshed, you "suddenly" see a couple of new positions. Thus, no position is lost and JOSM is still responsive.