[Gambas-user] how to use gb.map offline?

[roberto.premoli at tiscali.it]

Il 28.01.2023 14:55 Fabien Bodard ha scritto:

> Le sam. 28 janv. 2023 à 03:48, BB a écrit :
>
>> On 28/1/23 11:09 am, roberto.premoli at tiscali.it [2] wrote:
>>
>>> hello,
>>>
>>> I started to play with gb.map component and it is amazing!
>>> the question is: how to use it off line? I mean, my application 
>>> will
>>> work without access to internet,
>>> so I must first download the data of the area I need ( a region of
>>> italy) and then tell to gb.map to search data on local harddisk.
>>> is it feasible? if yes, how?
>>>
>>> Thanks,
>>> Roberto
>>>
>>
> Not a all 😅
> Just add a buffer name to the map tile layer
> It will save the tiles in .cache/gb.map/buffer name
> So you can use it in offline mode.
> By the way this is a grow only cache.. I've not made any things to 
> free
> it or update.
> (Todo things)
> It is not allowed to store tiles from Google or other non free 
> source..
> 😉 but for openstreetmap .. it's ok
>


To cache maps means that fist I have to connect the system to internet, 
visit ALL the area that is of my interest, so the module caches data 
locally for a next use. IT is rusty, but it can be done, due to the fact 
that the map i am interested in is quite little. But in case this will 
grow to a region/country it is clearly not enough and need a local 
server to provide data. Anyway, at the moment, i can use the "cache" 
trick. So, here the questions:
A. how to activate the cache? can you provide the prfof-of-concept 
program for this?
B. how i have to do the "caching" process? i mean, i have to zoom to 
the lowest detail possible "one street after the other" OR if i see "all 
italy" it imply that ALL data of italy will be archived locally with ALL 
related details (streets, building, names, etc).
Thanks,
Roberto



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