id	summary	reporter	owner	description	type	status	priority	milestone	component	version	resolution	keywords	cc
1572	[PATCH] OpenLayers	stoecker	framm	">> Hi,
>>  I tried yesterday to decide what's the best way to support Yahoo!
>> imagery with firefox 3 (or rather without ff 2). First I checked out
>> the OpenLayers plugin from Francisco Santos and tried to see what was
>> left to be done in it.  I like the idea of the plugin but there seem
>> to be unresolved design issues.
>>
>> Firstly, it does a switch from firefox to a java based browser for
>> downloading. Aside from the size of the file, this browser is slower
>> for me and causes josm to hang for a couple of seconds when loading
>> yahoo for the first time. On the other hand scrolling the mapview
>> doesn't spawn new processes like it would be with firefox so it's
>> smoother.  Perhaps it could be put into a thread of its own.
>>
>> Then the first thing that I found annoying was lack of progress
>> indication when downloading, so the first patch attached makes the
>> layer contents be displayed progressively as they're loaded.  Then
>> there's the issue with positioning and scalling the layer contents -
>> the code to do this is disabled with a ""TODO wrong calculations""
>> comment.  I found the calculations are actually correct but the whole
>> idea of chaging the map view according to the layer requirements is
>> bad.  In this case it causes infinite recurrency because updating the
>> view causes the open layer update (possibly download of new tiles) and
>> a map view update again.  Then it also implies restricting josm map
>> view to only the zoom levels supported by the openlayer, I think this
>> will be absolutely unusable.
>>
>> So I had an idea to reuse GeorefImage from WMSPlugin and store the
>> openlayer contents and scale and position them when necessary.  But
>> then I checked out the latest WMSPlugin and found that some yahoo
>> imagery support was added there with seemingly all the things I
>> needed, even the download is done in a separate thread and tiles are
>> downloaded automatically.  I installed gnome-web-photo 0.5 and it
>> basically works, with firefox 3 and wmsplugin, but the tiles were
>> displayed wrongly.  It took a lot of wrapping my head around it to
>> understand out why (basically firefox 3 / gnome-web-photo alwyas
>> return images enlarged to some constant window width and we have no
>> way to communicate the downloaded yahoo image width from browser back
>> to josm).  I managed to work around it and while there are new gecko
>> processes spawned all the time (like with ywms) it is quite usable and
>> works with firefox 3. The third attached patch is the work around.
"	defect	closed	minor		Plugin	tested	fixed