[Xastir] OSM tiles not displaying

[Tom Russo]

On Thu, Nov 28, 2013 at 09:13:20PM -0500, we recorded a bogon-computron collision of the <eric at christensenplace.us> flavor, containing:
> 
> Version:
> $ rpm -q xastir
> xastir-2.0.4-5.fc20.x86_64 (packaged in Fedora repos)

Hmmm, pretty much the current version of Xastir, modulo very minor tweaks 
unrelated to mapping.  Well, only thing left to check is what dependent libs 
they actually used to build the code against.

What does "Help->About" say, particularly about the version of ImageMagick
or GraphicsMagick it's built with?

Once you've determined whether they used ImageMagick or GraphicsMagick, you
will need to figure out whether you can display one of the OSM tiles you
see have been downloaded by Xastir.  Here's how:

  - Find a recently downloaded tile in the .xastir/OSM_tiles/mapnik directory.
    For example, I found /users/russo/.xastir/OSMtiles/mapnik/11/432/824.png
    was the most recent one downloaded.
  - If your Xastir was compiled against ImageMagick, use the ImageMagick
    "display" program to view it.  I.e.
      display /users/russo/.xastir/OSMtiles/mapnik/11/432/824.png"
  - If Xastir was compiled against GraphicsMagick, use
    "gm display":
      gm display /users/russo/.xastir/OSMtiles/mapnik/11/432/824.png

If that displays fine, something is wrong with how Xastir is built with
Magick on Fedora, or worse, it could be built against a version of ImageMagick 
that is so new it doesn't actually work with Xastir (that happens a lot, 
ImageMagick is very bleeding edge and often make changes that break 
backward compatibility, which is why most Xastir developers advocate 
GraphicsMagick instead).

-- 
Tom Russo    KM5VY   SAR502   DM64ux          http://www.swcp.com/~russo/
Tijeras, NM  QRPL#1592 K2#398  SOC#236        http://kevan.org/brain.cgi?DDTNM
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