Jerry sent me some OSM tweaks Friday. I managed to get them
tested and committed to CVS. Below are Jerry's notes about the
patch. I personally did a Reindex New on the maps a couple of
times, then killed/restarted Xastir to get the *.osm maps to be
removed from Map Chooser. Perhaps one reindex would have worked,
but I didn't check the map index file until I had done it twice.
Read Jerry's notes below. BTW: The <F4> key seems to work well for
me. I'm using FVWM2 like Tom is.
Thanks again Jerry, looks good! --Curt.
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Summary of changes:
- scaling corrected
- requested OSM map size limited to 2000x2000 and +/-89 deg latitude
- no 'binned' zoom levels
- new function key (F4) to 'optimize' zoom level for OSM
- .osm maps eliminated
- OSM map files (.geo) built from a single template
Details:
scaling corrected:
This required a major rewrite of the map_OSM.c code since
the map_tiger.c code that it was based on did not support
Mercator projection.
Note that due to size limitations from the server and the
use of Mercator scaling when the OSM bitmap images are rendered,
some OSM maps will not fill the display window. This is particularly
common when using a large display window. Selecting an optimized OSM
zoom level (F4) will generally, but not always, result in bit map
image that fills the window.
map size limitations:
The OSM map server that is used by this code limits the returned
bitmap image to 2000 pixels in either direction. Also, as a side
effect of the Mercator projection, latitude values must be limited
to -90 < lat < 90.
no binned zoom levels:
Attempts to constrain the linear Xastir scaling to the binned OSM
levels has been unsuccessful. The final straw was a problem with
float to integer transitions that would result in looping and
oscillation between levels.
new function key to optimize OSM zoom levels:
Since bitmap images do not scale well, they will always look best when
the Xastir scale is closest to the OSM scale. A function key (F4) has
been defined that will adjust the Xastir scale to the nearest OSM level
and redraw the screen. Note that even if the scale is not changed, the
F4 key will redraw the screen- this is intentional on my part.
The F4 key works only if an OSM map is selected.
If the F4 key is already defined for some other use on your system you
can specify an alternative key by modifying the map files (OSM*.geo).
The specified value must be an X11 KeySym value. Setting the value to 0
will disable the key.
.osm maps eliminated
Since binned scale levels are no longer supported, the .osm extension
is no longer needed. .osm file will not be installed.
If your maps directory (typically /usr/local/share/xastir/maps/Online/)
contains .osm file from an previous install you will have to remove
them by hand.
You should also re-index your files (Map->Configure->Index:Reindex
ALL maps) to remove them from the Map Chooser.
OSM map files (.geo) built from a single template:
This is primarily of interest to developers and results in a cleaner
source tree.
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