My GitHub (http://github.com/rnorris/viking/commits/AutoZoom) has been updated
in light of Greg's comments and my own continuing efforts.
Robert Norris writes:
Options have been added to the Layer's menus to zoom to view the layer
/ individual track / all waypoints.
NB if in the current zoom level, it can cover the view - then it does
not attempt to zoom in to find the 'best' zoom level.
I don't understand that choice. In my case, I have a waypoints file
with a waypoints in far away places (near Boston, near San Diego, and a
few others). I want to see waypoints when they're near what I'm looking
at, but if I say show me the track gpx I would like it to zoom to just
fit the gpx data in that layer.
This is an ease/simplicity of implementation.
The core algorithm just steps through zoom level until it finds one the
covers the desired view.
ATM If the view is big enough it does not attempt closer match - I will look
into doing this - perhaps a binary tree search through the zoom levels would
produce the best match and could be faster.
I suspect compared to rendering maps this takes 0 time even just linear.
I would code linear and leave it until proven slow (had I spare time :-)).
Updated: It's still a linear search, but it's not slow and so always starting
from a zoom factor of 1, it will find the best view (and never zoom in too
close)
Possible improvements can be:
. Set the view upon getting info from a GPS.
probably that should be a checkable/sticky keep GPS position onscreen,
and it should then cause panning gps to center when gps goes outside of
some area. not clear what it should do about zoom; my vote is don't touch.
I haven't changed the realtime tracking mode.
I've now been able to do it for acquire gps layer download methods
auto view the new data. ATM there's no choice in the matter (although
if in realtime tracking mode - it doesn't auto view the downloaded gps
layer data - since it just jump to the GPS current position anyway)
I guess I meant that acquire and show gps real-time track and follow
it are logically separate things to want to do.
Updated: View is automatically updated on GPS / Google date acquires.
'view waypoints' is attached to a single waypoint menu-wise, but is
about the layer. 'view waypoint'
True, I thought it's a waypoint thing so I put it in the waypoint menu.
I will move it to the Layer menu.
Done.
'view track' is cool, and it might be useful to have 'view tracks' on the
tracks part of the gpx.
New: View All Tracks option.
Thanks, and yes but I that would involve reworking the layers menu system,
since it has no menu!
However I can create some thing to go into the Layer menu.
[Also requires an extra internal maxmin of all tracks function - no problem]
From a UI viewpoint, what I meant is that right-clicking on the name of
the gpx file should let me view the file. Putting tracks/waypoints
specific stuff in the global layer menu feels too crowded, but whatever
is ok really.
The menu's are getting a little full - but hopefully better :)
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