Dear Andreas,
I am very glad to receive your reply and chat with you here. Yeap, you have answered all of my questions... great thank first...^.^ Now, I am very clear to the concept of your example, actually, I have studies at most all of your example in carto.net, they all given me a lot of idea to implement web based svg map application... thank you very much again...^.^ But one thing left is that, as you said, the query doesn't update the difference of two overlapping map extends, how come does the example acting actually similiar to just updating the [EMAIL PROTECTED]@ ?? Have you had that feeling...at least I felt it is...haha.. Great, I am trying to implement this concept in the following weeks...I will try your suggestion about the sesssion. By the way, my own database have not the levels as yours, what would be your guide to group the data in the difference levels, and how can it be done...?? Thanks you very much for your attention... Jacky --- In [email protected], "Andreas Neumann" <[EMAIL PROTECTED]> wrote: > > Hi Jacky, > > if you change the map extent by panning or zooming, the whole geometry > is removed and replaced by the new geometry - with the current > approach. I know, it is not very elegant, but easier to implement. The > current approach does not query the difference of two overlapping map > extents. It would probably be easy to calculate the intersection of > the previous map extent and the current map extent for panning (if the > two overlap at all), but it is definitely more complex for zooming. > Also you would have to introduce some session management or would have > to transfer the previous map extent with the URL request as well. > > You are welcome to enhance my example and post it for discussion. I'd > love to improve the tutorial and my prototypes if you have any good > suggestion. > > Does that answer your question? > > Andreas ----- To unsubscribe send a message to: [EMAIL PROTECTED] -or- visit http://groups.yahoo.com/group/svg-developers and click "edit my membership" ---- Yahoo! Groups Links <*> To visit your group on the web, go to: http://groups.yahoo.com/group/svg-developers/ <*> To unsubscribe from this group, send an email to: [EMAIL PROTECTED] <*> Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
