[ka-Map-users] Re: Code to indicate tiles have finished loading?

[Paul Spencer]

not currently.  Note that for a given map and extents, this could be  
a large amount of data ... many MB for sure, probably GB in useful  
apps I would think.  But if you wanted to do this, you would probably  
write a custom function in your app that would monitor the tile loads  
and keep moving to new extents until all the tiles are fetched.  I  
don't really see this as a general feature that I would want in cvs  
unless everyone thinks its a good idea.

Cheers

Paul

On 6-Oct-05, at 5:06 PM, Ken Sanderson wrote:

> Sorta related to this question, is there a way to allow the user to  
> force download all the tiles of the max extent at every scale  
> level? Thinking of some of our users that are on super slow dialup,  
> they would be willing to download while they east supper with the  
> assumption it would be faster after that.
>
> Ken
>
> Paul Spencer wrote:
>
>> Peter,
>> there could be :)  The way things are working right now (iirc) is   
>> that each image on each layer has its src changed when something   
>> happens like a pan or a zoom.  This *could* be tracked in kaMap  
>> by  incrementing a variable that indicates the number of tiles  
>> left to  load.  Each image has an onload event that is triggered  
>> to make the  image visible (it is set to not visible when the src  
>> is changed)  which could also decrement the tile count.
>> We could add a new event to indicate the that load status has  
>> changed  but this may involve some thrashing if the images load  
>> quickly before  the loop to set the src has finished (I don't even  
>> know if this is a  possible scenario).
>> Another way would be to have your app set a timer to check the  
>> load  status every 100ms or so and see if the load count has hit  
>> zero ...
>> If you come up with a good way in your app, share it with me and  
>> I'll  put it in cvs as I think this is a generally useful function.
>> Cheers
>> Paul
>> On 6-Oct-05, at 4:22 PM, Peter Giencke wrote:
>>
>>> Paul et al,
>>>
>>> Is there a lightweight way to determine when ka-map has finished   
>>> loading all
>>> layers for a particular view? I'm utilizing some WMS layers for one
>>> particular ka-map instance, and would like to indicate (with an   
>>> icon or
>>> something) that the mapplication is actually doing something  
>>> while  it's
>>> fetching/creating the tiles.
>>>
>>> -pete
>>>
>>>
>>>
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>> |Paul Spencer                           pspencer at dmsolutions.ca   |
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|Paul Spencer                           pspencer at dmsolutions.ca   |
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|Applications & Software Development                              |
|DM Solutions Group Inc                 http://www.dmsolutions.ca/|
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