[josm-dev] JOSM slippy_map_chooser plugin: some questions

[Ulf Lamping]

Frederik Ramm schrieb:
>> While trying the slippy_map_chooser, I was simply expecting that the 
>> whole dialog screen would be the bounding box for download. This 
>> would make it *much* easier to understand and use IMHO.
> Understand, yes; use, no. First, you must not forget that the tabs in 
> the download dialog are a two-way thing: select an area in one, and it 
> will be selected in the other as well. People have been using the map 
> tab for this: enter coordinates and, before downloading, check if the 
> yellow spot on the map is about where it should be.
Is this really true given the size that the yellow rectangle will have 
for any reasonable bounding box size? Actually I don't think so - as 
you'll only get a yellow dot somewhere (you can guess it might be 
southern germany) or you'll only have a yellow retangle on a 
green/greyish area (where you have no idea where you actually are) - 
both won't help a lot to get a good idea about your "current position". 
I still see the current "map" tab as nice to look at but in effect 
completely useless ...

I guess the smc would be *much more* helpful here.
>
> So the smc plugin must be able to represent *any* area selected on 
> another tab, which it cannot do by simply using the full of the 
> window. (I don't think the smc plugin currently displays what has been 
> chosen in another tab but it should probably do that).
Hmmm.
>> I've just zoomed into the slippy_map so I got the right cutout and 
>> clicked ok 
> What if you wanted to download an area with a different aspect ratio 
> or an area that was slightly more than displayed at zoom 17 but 
> slightly less than at zoom 16?
Is this really a problem? If you are going to download an area you 
usually will have to guess the area to work with anyway.
>> Would it be possible to just remove the "yellow rectangle" logic and 
>> simply download the "whole visible screen" of the dialog?
> I don't think that would be a good idea. (A possible compromise: Make 
> the yellow rectangle always encompass the full viewport *unless* 
> explicitly chosen by a mouse drag.)
Or simply, show a yellow rectangle only for the currently selected area 
given from a different tab and remove this rectangle as soon as the smc 
display is zoomed/moved.


However, the current implementation really needs an improvement in this 
regard ...

Regards, ULFL