[Xastir-dev] [Xastir] Open Street Map support (read this)

[Jerry Dunmire]

I appreciate you looking out for me and trying to make sure I don't
waste too much time.
Have a good trip,
...jerry


On Thu, Jun 10, 2010 at 10:19 AM, Curt, WE7U <curt.we7u at gmail.com> wrote:
> On Thu, 10 Jun 2010, Jerry Dunmire wrote:
>
>> I spent well into late last night (this morning) trying to find the
>> right place to put in the transition from continuous scaling to levels
>> but I'm not quite there. I know what needs to be done but I'm still
>> learning the code and looking for a single place that covers all the
>> transitions.
>
> Basically you just need one image that is slightly (or more) larger
> than the current Xastir viewport extents, then tell Xastir to use it
> and Xastir will use only what fits in it's viewport.
>
>
>> I would also like to propose, to be implemented at the same time as
>> the scaling change, a user option to use either the OSM levels or the
>> linear scaling. My reasoning is that scaling bit maps generally
>> produces blocky and/or blurry images. My personal preference is to
>> trade off better looking maps for less flexibility in setting the
>> scale, but I understand that others will have a different preference
>> and I think I can accommodate both.
>
> We've had excellent luck so far in doing it the one way.  I suspect
> the stuff you've seen elsewhere before just wasn't implemented
> properly, or they tried to scale too much.  We don't do that.  I'd
> vote no on the above proposal just 'cuz it would complicate multiple
> places in the code for no net gain.  I'm just one vote though.
>
>
>> I also want to get to the point where we can cache and use the OSM
>> tiles rather than large bitmaps. A slippy map implementation would be
>> great, but probably beyond my present skills. The use of tile caching
>> should provide a faster interface and eliminate large downloads for
>> small position changes.
>
> If we could get to caching tiles we could fix the problems we have
> with MS Terraserver as well, when the map view gets too wide.  They
> feed us something other than what we requested in that case, and it
> therefore gets georeferenced wrong by Xastir.  Requesting tiles in
> that case would bypass that problem.  Tiles could help with other
> internet map sources too I'm sure.
>
>
>> I have to travel for a couple of days starting tomorrow afternoon. So
>> my goal, assuming you are not adamant that I not do it, is to fix the
>> transition error before I leave. Then I can get started on the linear
>> scaling when I get back.
>>
>> Will that be OK?
>
> I'm not adamant.  Just didn't want you to waste your time.  Sounds
> like that's a moot point.  Have fun!
>
> I'm headed out too, perhaps tonight.  Hopefully will leave a nice
> track for the 500 miles I'll be driving.
>
> --
> Curt, WE7U.                         <http://www.eskimo.com/~archer>
>   APRS:  Where it's at!                    <http://www.xastir.org>
>  Lotto:  A tax on people who are bad at math. - unknown
> Windows:  Microsoft's tax on computer illiterates. - WE7U.
> The world DOES revolve around me:  I picked the coordinate system!"
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